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Edward Emelianov 2025-10-02 21:42:37 +03:00
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399
F3:F303/BME280/BMP280.c Normal file
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/**
* Ciastkolog.pl (https://github.com/ciastkolog)
*
*/
/**
* The MIT License (MIT)
*
* Copyright (c) 2016 sheinz (https://github.com/sheinz)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "i2c.h"
#include "spi.h"
#include "BMP280.h"
#ifdef EBUG
#include "strfunc.h"
#include "usb_dev.h"
extern volatile uint32_t Tms;
#endif
#include <math.h>
#define BMP280_I2C_ADDRESS_MASK (0x76)
#define BMP280_I2C_ADDRESS_0 (0x76)
#define BMP280_I2C_ADDRESS_1 (0x77)
/**
* BMP280 registers
*/
#define BMP280_REG_HUM_LSB 0xFE
#define BMP280_REG_HUM_MSB 0xFD
#define BMP280_REG_HUM (BMP280_REG_HUM_MSB)
#define BMP280_REG_TEMP_XLSB 0xFC /* bits: 7-4 */
#define BMP280_REG_TEMP_LSB 0xFB
#define BMP280_REG_TEMP_MSB 0xFA
#define BMP280_REG_TEMP (BMP280_REG_TEMP_MSB)
#define BMP280_REG_PRESS_XLSB 0xF9 /* bits: 7-4 */
#define BMP280_REG_PRESS_LSB 0xF8
#define BMP280_REG_PRESS_MSB 0xF7
#define BMP280_REG_PRESSURE (BMP280_REG_PRESS_MSB)
#define BMP280_REG_ALLDATA (BMP280_REG_PRESS_MSB) // all data: P, T & H
#define BMP280_REG_CONFIG 0xF5 /* bits: 7-5 t_sb; 4-2 filter; 0 spi3w_en */
#define BMP280_REG_CTRL 0xF4 /* bits: 7-5 osrs_t; 4-2 osrs_p; 1-0 mode */
#define BMP280_REG_STATUS 0xF3 /* bits: 3 measuring; 0 im_update */
#define BMP280_REG_CTRL_HUM 0xF2 /* bits: 2-0 osrs_h; */
#define BMP280_REG_RESET 0xE0
#define BMP280_RESET_VALUE 0xB6
#define BMP280_REG_ID 0xD0
#define BMP280_REG_CALIBA 0x88
#define BMP280_CALIBA_SIZE (26) // 26 bytes of calibration registers sequence from 0x88 to 0xa1
#define BMP280_CALIBB_SIZE (7) // 7 bytes of calibration registers sequence from 0xe1 to 0xe7
#define BMP280_REG_CALIBB 0xE1
#define BMP280_MODE_FORSED (1) // force single measurement
#define BMP280_MODE_NORMAL (3) // run continuosly
#define BMP280_STATUS_MSRNG (1<<3) // measuring in process
static uint8_t curaddress = BMP280_I2C_ADDRESS_0<<1;
// function to read N registers or only one
static uint8_t* (*read_regs)(uint8_t addr, uint8_t reg, uint8_t nbytes) = NULL;
// write data to register
static uint8_t (*write_data)(uint8_t addr, uint8_t *data, uint8_t nbytes) = NULL;
static int read_reg(uint8_t reg, uint8_t *val){
uint8_t *got = read_regs(curaddress, reg, 1);
if(!got) return 0;
if(val) *val = *got;
return 1;
}
static int write_reg(uint8_t reg, uint8_t val){
uint8_t d[2];
d[0] = reg; d[1] = val;
if(!write_data(curaddress, d, 2)) return 0;
return 1;
}
static struct {
// temperature
uint16_t dig_T1; // 0x88 (LSB), 0x98 (MSB)
int16_t dig_T2; // ...
int16_t dig_T3;
// pressure
uint16_t dig_P1;
int16_t dig_P2;
int16_t dig_P3;
int16_t dig_P4;
int16_t dig_P5;
int16_t dig_P6;
int16_t dig_P7;
int16_t dig_P8;
int16_t dig_P9; // 0x9e, 0x9f
// humidity (partially calculated from EEE struct)
uint8_t unused; // 0xA0
uint8_t dig_H1; // 0xA1
int16_t dig_H2; // --------------------
uint8_t dig_H3; // only from EEE
uint16_t dig_H4;
uint16_t dig_H5;
int8_t dig_H6;
// data is ready
uint8_t rdy;
} __attribute__ ((packed)) CaliData = {0};
//T: 28222 26310 50
//P: 37780 -10748 3024 7965 -43 -7 9900 -10230 4285
//H: 75 25601 0 334 50 30
static struct{
BMP280_Filter filter; // filtering
BMP280_Oversampling p_os; // oversampling for pressure
BMP280_Oversampling t_os; // -//- temperature
BMP280_Oversampling h_os; // -//- humidity
uint8_t ID; // identificator
uint8_t regctl; // control register base value [(params.t_os << 5) | (params.p_os << 2)]
} params = {
.filter = BMP280_FILTER_OFF,
.p_os = BMP280_OVERS16,
.t_os = BMP280_OVERS16,
.h_os = BMP280_OVERS16,
.ID = 0
};
static BMP280_status bmpstatus = BMP280_NOTINIT;
BMP280_status BMP280_get_status(){
return bmpstatus;
}
#define SPI_BUFSIZE (256)
static uint8_t SPIbuf[SPI_BUFSIZE];
// these functions for
static uint8_t *spi_readregs(uint8_t address, uint8_t reg, uint8_t len){
if(len > SPI_BUFSIZE-2) return NULL;
SPIbuf[0] = address | 0x80;
SPIbuf[1] = reg;
if(!spi_writeread(SPIbuf, len+2)) return NULL;
return SPIbuf + 2;
}
static uint8_t spi_write(uint8_t address, uint8_t *data, uint8_t n){
SPIbuf[0] = address;
memcpy(SPIbuf + 1, data, n);
return spi_writeread(SPIbuf, n+1);
}
// address: 0 or 1
void BMP280_setup(uint8_t address, uint8_t isI2C){
bmpstatus = BMP280_NOTINIT;
if(isI2C){
curaddress = (BMP280_I2C_ADDRESS_MASK | (address & 1))<<1;
read_regs = i2c_read_regs;
write_data = i2c_write;
i2c_setup(I2C_SPEED_10K);
}else{
curaddress = BMP280_I2C_ADDRESS_MASK | (address & 1);
read_regs = spi_readregs;
write_data = spi_write;
spi_setup();
}
BMP280_init();
}
// setters for `params`
void BMP280_setfilter(BMP280_Filter f){
params.filter = f;
}
BMP280_Filter BMP280_getfilter(){
return params.filter;
}
void BMP280_setOSt(BMP280_Oversampling os){
params.t_os = os;
}
void BMP280_setOSp(BMP280_Oversampling os){
params.p_os = os;
}
void BMP280_setOSh(BMP280_Oversampling os){
params.h_os = os;
}
// get compensation data, return 1 if OK
static int readcompdata(){
uint8_t *got = read_regs(curaddress, BMP280_REG_CALIBA, BMP280_CALIBA_SIZE);
if(!got) return 0;
memcpy(&CaliData, got, BMP280_CALIBA_SIZE);
CaliData.rdy = 1;
if(params.ID == BME280_CHIP_ID){
got = read_regs(curaddress, BMP280_REG_CALIBB, BMP280_CALIBB_SIZE);
if(got){
CaliData.dig_H2 = (got[1] << 8) | got[0];
CaliData.dig_H3 = got[2];
CaliData.dig_H4 = (got[3] << 4) | (got[4] & 0x0f);
CaliData.dig_H5 = (got[5] << 4) | (got[4] >> 4);
CaliData.dig_H6 = got[6];
}
}
return 1;
}
// read compensation data & write registers
int BMP280_init(){
IWDG->KR = IWDG_REFRESH;
DBG("INI:\n");
if(!read_reg(BMP280_REG_ID, &params.ID)){
DBG("Can't get ID\n");
return 0;
}
if(params.ID != BMP280_CHIP_ID && params.ID != BME280_CHIP_ID){
DBG("Not BMP/BME\n");
return 0;
}
if(!write_reg(BMP280_REG_RESET, BMP280_RESET_VALUE)){
DBG("Can't reset\n");
return 0;
}
uint8_t reg = 1;
while(reg & 1){
if(!read_reg(BMP280_REG_STATUS, &reg)){
DBG("can't get status\n");
return 0;
}
}
if(!readcompdata()){
DBG("Can't read calibration data\n");
return 0;
}
// write filter configuration
reg = params.filter << 2;
if(!write_reg(BMP280_REG_CONFIG, reg)){DBG("Can't save filter settings\n");}
reg = (params.t_os << 5) | (params.p_os << 2); // oversampling for P/T, sleep mode
if(!write_reg(BMP280_REG_CTRL, reg)){
DBG("Can't write settings for P/T\n");
return 0;
}
params.regctl = reg;
if(params.ID == BME280_CHIP_ID){ // write CTRL_HUM only AFTER CTRL!
reg = params.h_os;
if(!write_reg(BMP280_REG_CTRL_HUM, reg)){
DBG("Can't write settings for H\n");
return 0;
}
}
bmpstatus = BMP280_RELAX;
return 1;
}
// @return 1 if OK, *devid -> BMP/BME
int BMP280_read_ID(uint8_t *devid){
if(params.ID != BMP280_CHIP_ID && params.ID != BME280_CHIP_ID) return 0;
*devid = params.ID;
return 1;
}
// start measurement, @return 1 if all OK
int BMP280_start(){
if(!CaliData.rdy || bmpstatus == BMP280_BUSY){
#ifdef EBUG
USB_sendstr("rdy="); USB_sendstr(u2str(CaliData.rdy));
USB_sendstr("\nbmpstatus="); USB_sendstr(u2str(bmpstatus));
newline();
#endif
return 0;
}
uint8_t reg = params.regctl | BMP280_MODE_FORSED;
if(!write_reg(BMP280_REG_CTRL, reg)){
DBG("Can't write CTRL reg\n");
return 0;
}
bmpstatus = BMP280_BUSY;
return 1;
}
void BMP280_process(){
if(bmpstatus == BMP280_NOTINIT){
BMP280_init(); return;
}
if(bmpstatus != BMP280_BUSY) return;
// BUSY state: poll data ready
uint8_t reg;
if(!read_reg(BMP280_REG_STATUS, &reg)) return;
if(reg & BMP280_STATUS_MSRNG) return; // still busy
bmpstatus = BMP280_RDY; // data ready
}
// return T*100 degC
static inline int32_t compTemp(int32_t adc_temp, int32_t *t_fine){
int32_t var1, var2;
var1 = ((((adc_temp >> 3) - ((int32_t) CaliData.dig_T1 << 1)))
* (int32_t) CaliData.dig_T2) >> 11;
var2 = (((((adc_temp >> 4) - (int32_t) CaliData.dig_T1)
* ((adc_temp >> 4) - (int32_t) CaliData.dig_T1)) >> 12)
* (int32_t) CaliData.dig_T3) >> 14;
*t_fine = var1 + var2;
return (*t_fine * 5 + 128) >> 8;
}
// return p*256 hPa
static inline uint32_t compPres(int32_t adc_press, int32_t fine_temp) {
int64_t var1, var2, p;
var1 = (int64_t) fine_temp - 128000;
var2 = var1 * var1 * (int64_t) CaliData.dig_P6;
var2 = var2 + ((var1 * (int64_t) CaliData.dig_P5) << 17);
var2 = var2 + (((int64_t) CaliData.dig_P4) << 35);
var1 = ((var1 * var1 * (int64_t) CaliData.dig_P3) >> 8)
+ ((var1 * (int64_t) CaliData.dig_P2) << 12);
var1 = (((int64_t) 1 << 47) + var1) * ((int64_t) CaliData.dig_P1) >> 33;
if (var1 == 0){
return 0; // avoid exception caused by division by zero
}
p = 1048576 - adc_press;
p = (((p << 31) - var2) * 3125) / var1;
var1 = ((int64_t) CaliData.dig_P9 * (p >> 13) * (p >> 13)) >> 25;
var2 = ((int64_t) CaliData.dig_P8 * p) >> 19;
p = ((p + var1 + var2) >> 8) + ((int64_t) CaliData.dig_P7 << 4);
return p;
}
// return H*1024 %
static inline uint32_t compHum(int32_t adc_hum, int32_t fine_temp){
int32_t v_x1_u32r;
v_x1_u32r = fine_temp - (int32_t) 76800;
v_x1_u32r = ((((adc_hum << 14) - (((int32_t)CaliData.dig_H4) << 20)
- (((int32_t)CaliData.dig_H5) * v_x1_u32r)) + (int32_t)16384) >> 15)
* (((((((v_x1_u32r * ((int32_t)CaliData.dig_H6)) >> 10)
* (((v_x1_u32r * ((int32_t)CaliData.dig_H3)) >> 11)
+ (int32_t)32768)) >> 10) + (int32_t)2097152)
* ((int32_t)CaliData.dig_H2) + 8192) >> 14);
v_x1_u32r = v_x1_u32r
- (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7)
* ((int32_t)CaliData.dig_H1)) >> 4);
v_x1_u32r = v_x1_u32r < 0 ? 0 : v_x1_u32r;
v_x1_u32r = v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r;
return v_x1_u32r >> 12;
}
// read data & convert it
int BMP280_getdata(float *T, float *P, float *H){
if(bmpstatus != BMP280_RDY) return 0;
bmpstatus = BMP280_RELAX;
uint8_t datasz = 8; // amount of bytes to read
if(params.ID != BME280_CHIP_ID){
if(H) *H = 0;
H = NULL;
datasz = 6;
}
uint8_t *data = read_regs(curaddress, BMP280_REG_ALLDATA, datasz);
if(!data) return 0;
int32_t p = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
int32_t t = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
int32_t t_fine;
int32_t Temp = compTemp(t, &t_fine);
if(T) *T = ((float)Temp)/100.f;
if(P) *P = ((float)compPres(p, t_fine)) / 256.f;
if(H){
int32_t h = (data[6] << 8) | data[7];
*H = ((float)compHum(h, t_fine))/1024.;
}
return 1;
}
// dewpoint calculation (T in degrC, H in percents)
float Tdew(float T, float H){
float gamma = 17.27f * T / (237.7f + T) + logf(H/100.f);
return (237.7f * gamma)/(17.27 - gamma);
}

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F3:F303/BME280/BMP280.h Normal file
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/**
* Ciastkolog.pl (https://github.com/ciastkolog)
*
*/
/**
* The MIT License (MIT)
*
* Copyright (c) 2016 sheinz (https://github.com/sheinz)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifndef BMP280_H__
#define BMP280_H__
#include <stm32f3.h>
#define BMP280_CHIP_ID 0x58
#define BME280_CHIP_ID 0x60
typedef enum{ // K for filtering: next = [prev*(k-1) + data_ADC]/k
BMP280_FILTER_OFF = 0, // k=1, no filtering
BMP280_FILTER_2 = 1, // k=2, 2 samples to reach >75% of data_ADC
BMP280_FILTER_4 = 2, // k=4, 5 samples
BMP280_FILTER_8 = 3, // k=8, 11 samples
BMP280_FILTER_16 = 4, // k=16, 22 samples
BMP280_FILTERMAX
} BMP280_Filter;
typedef enum{ // Number of oversampling
BMP280_NOMEASUR = 0,
BMP280_OVERS1 = 1,
BMP280_OVERS2 = 2,
BMP280_OVERS4 = 3,
BMP280_OVERS8 = 4,
BMP280_OVERS16 = 5,
BMP280_OVERSMAX
} BMP280_Oversampling;
typedef enum{
BMP280_NOTINIT, // wasn't inited
BMP280_BUSY, // measurement in progress
BMP280_ERR, // error in I2C
BMP280_RELAX, // relaxed state
BMP280_RDY, // data ready - can get it
} BMP280_status;
void BMP280_setup(uint8_t address, uint8_t isI2C);
int BMP280_init();
void BMP280_setfilter(BMP280_Filter f);
BMP280_Filter BMP280_getfilter();
void BMP280_setOSt(BMP280_Oversampling os);
void BMP280_setOSp(BMP280_Oversampling os);
void BMP280_setOSh(BMP280_Oversampling os);
int BMP280_read_ID(uint8_t *devid);
BMP280_status BMP280_get_status();
int BMP280_start();
void BMP280_process();
int BMP280_getdata(float *T, float *P, float *H);
float Tdew(float T, float H);
#endif // BMP280_H__

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BINARY := bme280
# MCU code
MCU := F303xb
# change this linking script depending on particular MCU model,
LDSCRIPT := stm32f303xB.ld
DEFINES := -DUSB1_16
LDADD := -lm
include ../makefile.f3
include ../../makefile.stm32

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Work with BMP280/BME280 over SPI or I2C

BIN
F3:F303/BME280/bme280.bin Executable file
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Binary file not shown.

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-std=c17

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F3:F303/BME280/bme280.config Normal file
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// Add predefined macros for your project here. For example:
// #define THE_ANSWER 42
#define EBUG
#define STM32F3
#define STM32F303xb
#define __thumb2__ 1
#define __ARM_ARCH_7M__

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F3:F303/BME280/bme280.creator Normal file
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[General]

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F3:F303/BME280/bme280.creator.user Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE QtCreatorProject>
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1
F3:F303/BME280/bme280.cxxflags Normal file
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-std=c++17

24
F3:F303/BME280/bme280.files Normal file
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BMP280.c
BMP280.h
hardware.c
hardware.h
i2c.c
i2c.h
main.c
proto.c
proto.h
ringbuffer.c
ringbuffer.h
spi.c
spi.h
strfunc.c
strfunc.h
usb.c
usb.h
usb_descr.c
usb_descr.h
usb_dev.c
usb_dev.h
usb_lib.c
usb_lib.h
usbhw.h
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After

Width:  |  Height:  |  Size: 217 B

6
F3:F303/BME280/bme280.includes Normal file
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.
../inc
../inc/Fx
../inc/cm
../inc/ld
../inc/startup

34
F3:F303/BME280/hardware.c Normal file
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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hardware.h"
static inline void gpio_setup(){
RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN; // for USART and LEDs
for(int i = 0; i < 10000; ++i) nop();
// USB - alternate function 14 @ pins PA11/PA12; SWD - AF0 @PA13/14
GPIOA->AFR[1] = AFRf(14, 11) | AFRf(14, 12);
GPIOA->MODER = MODER_AF(11) | MODER_AF(12) | MODER_AF(13) | MODER_AF(14) | MODER_O(15);
GPIOB->MODER = MODER_O(0) | MODER_O(1);
GPIOB->ODR = 1;
}
void hw_setup(){
gpio_setup();
}

31
F3:F303/BME280/hardware.h Normal file
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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
#define USBPU_port GPIOA
#define USBPU_pin (1<<15)
#define USBPU_ON() pin_clear(USBPU_port, USBPU_pin)
#define USBPU_OFF() pin_set(USBPU_port, USBPU_pin)
extern volatile uint32_t Tms;
void hw_setup();

222
F3:F303/BME280/i2c.c Normal file
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/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stm32f3.h>
#include <string.h>
#include "i2c.h"
#include "strfunc.h" // hexdump
#include "usb_dev.h"
i2c_speed_t i2c_curspeed = I2C_SPEED_AMOUNT;
extern volatile uint32_t Tms;
static uint32_t cntr;
volatile uint8_t i2c_scanmode = 0; // == 1 when I2C is in scan mode
static uint8_t i2caddr = I2C_ADDREND; // current address in scan mode
static uint8_t I2Cbuf[I2C_BUFSIZE];
// GPIO Resources: I2C1_SCL - PB6 (AF4), I2C1_SDA - PB7 (AF4)
void i2c_setup(i2c_speed_t speed){
uint8_t PRESC, SCLDEL = 0x04, SDADEL = 0x03, SCLH, SCLL; // I2C1->TIMINGR fields
switch(speed){
case I2C_SPEED_10K:
PRESC = 0x0F;
SCLH = 0xDA;
SCLL = 0xE0;
break;
case I2C_SPEED_100K:
PRESC = 0x0F;
SCLH = 0x13;
SCLL = 0x16;
break;
case I2C_SPEED_400K:
PRESC = 0x07;
SCLH = 0x08;
SCLL = 0x09;
break;
case I2C_SPEED_1M:
SDADEL = 1;
SCLDEL = 2;
PRESC = 0x3;
SCLH = 0x4;
SCLL = 0x6;
break;
/*case I2C_SPEED_2M:
SDADEL = 0;
SCLDEL = 1;
PRESC = 0x0;
SCLH = 0x1;
SCLL = 0x2;
break;*/
default:
USND("Wrong I2C speed!");
return; // wrong speed
}
RCC->AHBENR |= RCC_AHBENR_GPIOBEN;
I2C1->CR1 = 0; // disable I2C for setup
I2C1->ICR = 0x3f38; // clear all errors
GPIOB->AFR[0] = (GPIOB->AFR[0] & ~(GPIO_AFRL_AFRL6 | GPIO_AFRL_AFRL7)) |
AFRf(4, 6) | AFRf(4, 7);
GPIOB->MODER = (GPIOB->MODER & ~(GPIO_MODER_MODER6 | GPIO_MODER_MODER7)) |
GPIO_MODER_MODER6_AF | GPIO_MODER_MODER7_AF;
GPIOB->PUPDR = (GPIOB->PUPDR & !(GPIO_PUPDR_PUPDR6 | GPIO_PUPDR_PUPDR7)) |
GPIO_PUPDR6_PU | GPIO_PUPDR7_PU; // pullup (what if there's no external pullup?)
GPIOB->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7; // both open-drain outputs
// I2C (default timing from sys clock - 72MHz)
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // clocking
if(speed < I2C_SPEED_400K){ // slow cpeed - common mode
SYSCFG->CFGR1 &= ~(SYSCFG_CFGR1_I2C1_FMP | SYSCFG_CFGR1_I2C_PB6_FMP | SYSCFG_CFGR1_I2C_PB7_FMP);
}else{ // activate "fast mode plus"
SYSCFG->CFGR1 |= SYSCFG_CFGR1_I2C1_FMP | SYSCFG_CFGR1_I2C_PB6_FMP | SYSCFG_CFGR1_I2C_PB7_FMP;
}
I2C1->TIMINGR = (PRESC<<I2C_TIMINGR_PRESC_Pos) | (SCLDEL<<I2C_TIMINGR_SCLDEL_Pos) |
(SDADEL<<I2C_TIMINGR_SDADEL_Pos) | (SCLH<<I2C_TIMINGR_SCLH_Pos) | (SCLL<< I2C_TIMINGR_SCLL_Pos);
I2C1->CR1 = I2C_CR1_PE;
i2c_curspeed = speed;
}
// wait until bit set or clear; return 1 if OK, 0 in case of timeout
static uint8_t waitISRbit(uint32_t bit, uint8_t isset){
uint32_t waitwhile = (isset) ? 0 : bit; // wait until !=
//const char *errmsg = NULL;
cntr = Tms;
//if(bit != I2C_ISR_RXNE){ U("ISR wait "); U(uhex2str(bit)); USND(isset ? "set" : "reset"); }
while((I2C1->ISR & bit) == waitwhile){
IWDG->KR = IWDG_REFRESH;
if(I2C1->ISR & I2C_ISR_NACKF){
//errmsg = "NAK";
goto goterr;
}
if(Tms - cntr > I2C_TIMEOUT){
//errmsg = "timeout";
goto goterr;
}
}
return 1;
goterr:
/*U("wait ISR bit: "); USND(errmsg);
U("I2c->ISR = "); USND(uhex2str(I2C1->ISR));*/
I2C1->ICR = 0xff;
return 0;
}
// start writing
static uint8_t i2c_startw(uint8_t addr, uint8_t nbytes, uint8_t stop){
if(!waitISRbit(I2C_ISR_BUSY, 0)) return 0;
uint32_t cr2 = nbytes << 16 | addr | I2C_CR2_START;
if(stop) cr2 |= I2C_CR2_AUTOEND;
// now start transfer
I2C1->CR2 = cr2;
return 1;
}
/**
* write command byte to I2C
* @param addr - device address
* @param data - bytes to write
* @param nbytes - amount of bytes to write
* @param stop - to set STOP
* @return 0 if error
*/
static uint8_t i2c_writes(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t stop){
if(!i2c_startw(addr, nbytes, stop)) return 0;
for(int i = 0; i < nbytes; ++i){
cntr = Tms;
while(!(I2C1->ISR & I2C_ISR_TXIS)){ // ready to transmit
IWDG->KR = IWDG_REFRESH;
if(I2C1->ISR & I2C_ISR_NACKF){
I2C1->ICR |= I2C_ICR_NACKCF;
//USND("i2c_writes: NAK");
return 0;
}
if(Tms - cntr > I2C_TIMEOUT){
//USND("i2c_writes: Timeout");
return 0;
}
}
I2C1->TXDR = data[i]; // send data
//U("i2c_writes: "); USND(uhex2str(data[i]));
}
cntr = Tms;
if(stop){
if(!waitISRbit(I2C_ISR_BUSY, 0)) return 0;
}else{ // repeated start
if(!waitISRbit(I2C_ISR_TC, 1)) return 0;
}
return 1;
}
uint8_t i2c_write(uint8_t addr, uint8_t *data, uint8_t nbytes){
return i2c_writes(addr, data, nbytes, 1);
}
// start reading of `nbytes` from `addr`; if `start`==`, set START
static uint8_t i2c_startr(uint8_t addr, uint8_t nbytes, uint8_t start){
uint32_t cr2 = addr | I2C_CR2_RD_WRN | I2C_CR2_AUTOEND | (nbytes << 16);
I2C1->CR2 = (start) ? cr2 | I2C_CR2_START : cr2;
return 1;
}
/**
* read nbytes of data from I2C line
* all functions with `addr` should have addr = address << 1
* `data` should be an array with at least `nbytes` length
* @return 1 if all OK, 0 if NACK or no device found
*/
static uint8_t *i2c_readb(uint8_t addr, uint8_t nbytes){
uint8_t *bptr = I2Cbuf;
if(!i2c_startr(addr, nbytes, 1)) return NULL;
for(int i = 0; i < nbytes; ++i){
if(!waitISRbit(I2C_ISR_RXNE, 1)) goto tmout;
*bptr++ = I2C1->RXDR;
}
return I2Cbuf;
tmout:
//USND("read I2C: Timeout");
return NULL;
}
uint8_t *i2c_read(uint8_t addr, uint8_t nbytes){
if(!waitISRbit(I2C_ISR_BUSY, 0)) return 0;
return i2c_readb(addr, nbytes);
}
// read register reg
uint8_t *i2c_read_regs(uint8_t addr, uint8_t reg, uint8_t nbytes){
if(!waitISRbit(I2C_ISR_BUSY, 0)) return NULL;
if(!i2c_writes(addr, &reg, 1, 0)) return NULL;
return i2c_readb(addr, nbytes);
}
void i2c_init_scan_mode(){
i2caddr = 1; // start from 1 as 0 is a broadcast address
i2c_scanmode = 1;
}
// return 1 if next addr is active & return in as `addr`
// if addresses are over, return 1 and set addr to I2C_NOADDR
// if scan mode inactive, return 0 and set addr to I2C_NOADDR
int i2c_scan_next_addr(uint8_t *addr){
*addr = i2caddr;
if(i2caddr == I2C_ADDREND){
*addr = I2C_ADDREND;
i2c_scanmode = 0;
return 0;
}
if(!i2c_read((i2caddr++)<<1, 1)) return 0;
return 1;
}

46
F3:F303/BME280/i2c.h Normal file
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/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#define I2C_ADDREND (0x80)
#define I2C_BUFSIZE (256)
typedef enum{
I2C_SPEED_10K,
I2C_SPEED_100K,
I2C_SPEED_400K,
I2C_SPEED_1M,
I2C_SPEED_AMOUNT
} i2c_speed_t;
extern i2c_speed_t i2c_curspeed;
extern volatile uint8_t i2c_scanmode;
// timeout of I2C bus in ms
#define I2C_TIMEOUT (5)
void i2c_setup(i2c_speed_t speed);
uint8_t *i2c_read(uint8_t addr, uint8_t nbytes);
uint8_t *i2c_read_regs(uint8_t addr, uint8_t reg, uint8_t nbytes);
uint8_t i2c_write(uint8_t addr, uint8_t *data, uint8_t nbytes);
void i2c_init_scan_mode();
int i2c_scan_next_addr(uint8_t *addr);

77
F3:F303/BME280/main.c Normal file
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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hardware.h"
#include "i2c.h"
#include "proto.h"
#include "spi.h"
#include "strfunc.h"
#include "usb_dev.h"
#include "BMP280.h"
#define MAXSTRLEN RBINSZ
volatile uint32_t Tms = 0;
void sys_tick_handler(void){
++Tms;
}
int main(void){
char inbuff[MAXSTRLEN+1];
if(StartHSE()){
SysTick_Config((uint32_t)72000); // 1ms
}else{
StartHSI();
SysTick_Config((uint32_t)48000); // 1ms
}
hw_setup();
USBPU_OFF();
USB_setup();
BMP280_setup(0, 1);
uint32_t ctr = Tms, Tmeas = 0;
USBPU_ON();
while(1){
if(Tms - ctr > 499){
ctr = Tms;
pin_toggle(GPIOB, 1 << 1 | 1 << 0); // toggle LED @ PB0
}
int l = USB_receivestr(inbuff, MAXSTRLEN);
if(l < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
else if(l){
const char *ans = parse_cmd(inbuff);
if(ans) USB_sendstr(ans);
}
BMP280_process();
if(Tms - Tmeas > 9999){
BMP280_status s = BMP280_get_status();
float Temperature, Pressure, Humidity, Dewpoint;
if(s == BMP280_NOTINIT || s == BMP280_ERR) BMP280_init();
else if(s == BMP280_RDY && BMP280_getdata(&Temperature, &Pressure, &Humidity)){
Dewpoint = Tdew(Temperature, Humidity);
USB_sendstr("Tdeg="); USB_sendstr(float2str(Temperature, 2)); USB_sendstr("\nPpa=");
USB_sendstr(float2str(Pressure, 1));
USB_sendstr("\nPmm="); USB_sendstr(float2str(Pressure * 0.00750062f, 1));
USB_sendstr("\nH="); USB_sendstr(float2str(Humidity, 1));
USB_sendstr("\nTdew="); USB_sendstr(float2str(Dewpoint, 1));
newline();
Tmeas += 10000;
}
}
}
}

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F3:F303/BME280/openocd.cfg Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# script for stm32f3x family
#
# stm32 devices support both JTAG and SWD transports.
#
source [find interface/stlink-v2-1.cfg]
source [find target/swj-dp.tcl]
source [find mem_helper.tcl]
if { [info exists CHIPNAME] } {
set _CHIPNAME $CHIPNAME
} else {
set _CHIPNAME stm32f3x
}
set _ENDIAN little
# Work-area is a space in RAM used for flash programming
# By default use 16kB
if { [info exists WORKAREASIZE] } {
set _WORKAREASIZE $WORKAREASIZE
} else {
set _WORKAREASIZE 0x4000
}
# JTAG speed should be <= F_CPU/6. F_CPU after reset is 8MHz, so use F_JTAG = 1MHz
#
# Since we may be running of an RC oscilator, we crank down the speed a
# bit more to be on the safe side. Perhaps superstition, but if are
# running off a crystal, we can run closer to the limit. Note
# that there can be a pretty wide band where things are more or less stable.
adapter speed 1000
adapter srst delay 100
if {[using_jtag]} {
jtag_ntrst_delay 100
}
#jtag scan chain
if { [info exists CPUTAPID] } {
set _CPUTAPID $CPUTAPID
} else {
if { [using_jtag] } {
# See STM Document RM0316
# Section 29.6.3 - corresponds to Cortex-M4 r0p1
set _CPUTAPID 0x4ba00477
} {
set _CPUTAPID 0x2ba01477
}
}
swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
if {[using_jtag]} {
jtag newtap $_CHIPNAME bs -irlen 5
}
set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME stm32f1x 0 0 0 0 $_TARGETNAME
reset_config srst_nogate
if {![using_hla]} {
# if srst is not fitted use SYSRESETREQ to
# perform a soft reset
cortex_m reset_config sysresetreq
}
proc stm32f3x_default_reset_start {} {
# Reset clock is HSI (8 MHz)
adapter speed 1000
}
proc stm32f3x_default_examine_end {} {
# Enable debug during low power modes (uses more power)
mmw 0xe0042004 0x00000007 0 ;# DBGMCU_CR |= DBG_STANDBY | DBG_STOP | DBG_SLEEP
# Stop watchdog counters during halt
mmw 0xe0042008 0x00001800 0 ;# DBGMCU_APB1_FZ |= DBG_IWDG_STOP | DBG_WWDG_STOP
}
proc stm32f3x_default_reset_init {} {
# Configure PLL to boost clock to HSI x 8 (64 MHz)
mww 0x40021004 0x00380400 ;# RCC_CFGR = PLLMUL[3:1] | PPRE1[2]
mmw 0x40021000 0x01000000 0 ;# RCC_CR |= PLLON
mww 0x40022000 0x00000012 ;# FLASH_ACR = PRFTBE | LATENCY[1]
sleep 10 ;# Wait for PLL to lock
mmw 0x40021004 0x00000002 0 ;# RCC_CFGR |= SW[1]
# Boost JTAG frequency
adapter speed 8000
}
# Default hooks
$_TARGETNAME configure -event examine-end { stm32f3x_default_examine_end }
$_TARGETNAME configure -event reset-start { stm32f3x_default_reset_start }
$_TARGETNAME configure -event reset-init { stm32f3x_default_reset_init }
tpiu create $_CHIPNAME.tpiu -dap $_CHIPNAME.dap -ap-num 0 -baseaddr 0xE0040000
lappend _telnet_autocomplete_skip _proc_pre_enable_$_CHIPNAME.tpiu
proc _proc_pre_enable_$_CHIPNAME.tpiu {_targetname} {
targets $_targetname
# Set TRACE_IOEN; TRACE_MODE is set to async; when using sync
# change this value accordingly to configure trace pins
# assignment
mmw 0xe0042004 0x00000020 0
}
$_CHIPNAME.tpiu configure -event pre-enable "_proc_pre_enable_$_CHIPNAME.tpiu $_TARGETNAME"

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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stm32f3.h>
#include <string.h>
#include "spi.h"
#include "strfunc.h"
#include "usb_dev.h"
#include "version.inc"
#define LOCBUFFSZ (32)
// local buffer for SPI data to send
static uint8_t locBuffer[LOCBUFFSZ];
static const char *ERR = "ERR\n", *OK = "OK\n";
extern volatile uint32_t Tms;
const char *helpstring =
"https://github.com/eddyem/stm32samples/tree/master/F3:F303/xxx build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
"i - [re]init SPI1\n"
"s - send up to 32 bytes of data and read answer\n"
"T - print current Tms\n"
;
// read N numbers from buf, @return 0 if wrong or none
TRUE_INLINE uint16_t readNnumbers(const char *buf){
uint32_t D;
const char *nxt;
uint16_t N = 0;
while((nxt = getnum(buf, &D)) && nxt != buf && N < LOCBUFFSZ){
if(D > 0xff){ USND("Each number should be uint8_t"); return 0; }
buf = nxt;
locBuffer[N++] = (uint8_t) D&0xff;
USND("add byte: "); USND(uhex2str(D&0xff)); USND("\n");
}
USND("Send "); USND(u2str(N)); USND(" bytes\n");
return N;
}
TRUE_INLINE const char* spirdwr(const char *buf){
if(spi_status != SPI_READY){ USND("SPI not ready!"); return NULL; }
uint16_t got = readNnumbers(buf);
if(got < 1){ USND("Enter at least one uint8_t"); return NULL; }
if(!spi_writeread(locBuffer, got)) return ERR;
USND("Read data:");
hexdump(USB_sendstr, locBuffer, got);
return NULL;
}
const char *parse_cmd(const char *buf){
// "long" commands
if(buf[1]){
char c = *buf++;
switch(c){
case 's':
return spirdwr(buf);
default: return buf; // echo input
}
}
/* switch(*buf){
case '':
break;
}*/
// "short" commands
switch(*buf){
case 'i':
spi_setup();
return OK;
case 'T':
USB_sendstr("T=");
USB_sendstr(u2str(Tms));
newline();
break;
default: // help
USB_sendstr(helpstring);
break;
}
return NULL;
}

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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
char *parse_cmd(char *buf);

184
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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ringbuffer.h"
static int datalen(ringbuffer *b){
if(b->tail >= b->head) return (b->tail - b->head);
else return (b->length - b->head + b->tail);
}
// stored data length
int RB_datalen(ringbuffer *b){
if(b->busy) return -1;
b->busy = 1;
int l = datalen(b);
b->busy = 0;
return l;
}
static int hasbyte(ringbuffer *b, uint8_t byte){
if(b->head == b->tail) return -1; // no data in buffer
int startidx = b->head;
if(b->head > b->tail){ //
for(int found = b->head; found < b->length; ++found)
if(b->data[found] == byte) return found;
startidx = 0;
}
for(int found = startidx; found < b->tail; ++found)
if(b->data[found] == byte) return found;
return -1;
}
/**
* @brief RB_hasbyte - check if buffer has given byte stored
* @param b - buffer
* @param byte - byte to find
* @return index if found, -1 if none or busy
*/
int RB_hasbyte(ringbuffer *b, uint8_t byte){
if(b->busy) return -1;
b->busy = 1;
int ret = hasbyte(b, byte);
b->busy = 0;
return ret;
}
// poor memcpy
static void mcpy(uint8_t *targ, const uint8_t *src, int l){
while(l--) *targ++ = *src++;
}
// increment head or tail
TRUE_INLINE void incr(ringbuffer *b, volatile int *what, int n){
*what += n;
if(*what >= b->length) *what -= b->length;
}
static int read(ringbuffer *b, uint8_t *s, int len){
int l = datalen(b);
if(!l) return 0;
if(l > len) l = len;
int _1st = b->length - b->head;
if(_1st > l) _1st = l;
if(_1st > len) _1st = len;
mcpy(s, b->data + b->head, _1st);
if(_1st < len && l > _1st){
mcpy(s+_1st, b->data, l - _1st);
incr(b, &b->head, l);
return l;
}
incr(b, &b->head, _1st);
return _1st;
}
/**
* @brief RB_read - read data from ringbuffer
* @param b - buffer
* @param s - array to write data
* @param len - max len of `s`
* @return bytes read or -1 if busy
*/
int RB_read(ringbuffer *b, uint8_t *s, int len){
if(b->busy) return -1;
b->busy = 1;
int r = read(b, s, len);
b->busy = 0;
return r;
}
static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
int idx = hasbyte(b, byte);
if(idx < 0) return 0;
int partlen = idx + 1 - b->head;
// now calculate length of new data portion
if(idx < b->head) partlen += b->length;
if(partlen > len) return -read(b, s, len);
return read(b, s, partlen);
}
/**
* @brief RB_readto fill array `s` with data until byte `byte` (with it)
* @param b - ringbuffer
* @param byte - check byte
* @param s - buffer to write data
* @param len - length of `s`
* @return amount of bytes written (negative, if len<data in buffer or buffer is busy)
*/
int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
if(b->busy) return -1;
b->busy = 1;
int n = readto(b, byte, s, len);
b->busy = 0;
return n;
}
static int write(ringbuffer *b, const uint8_t *str, int l){
int r = b->length - 1 - datalen(b); // rest length
if(l > r || !l) return 0;
int _1st = b->length - b->tail;
if(_1st > l) _1st = l;
mcpy(b->data + b->tail, str, _1st);
if(_1st < l){ // add another piece from start
mcpy(b->data, str+_1st, l-_1st);
}
incr(b, &b->tail, l);
return l;
}
/**
* @brief RB_write - write some data to ringbuffer
* @param b - buffer
* @param str - data
* @param l - length
* @return amount of bytes written or -1 if busy
*/
int RB_write(ringbuffer *b, const uint8_t *str, int l){
if(b->busy) return -1;
b->busy = 1;
int w = write(b, str, l);
b->busy = 0;
return w;
}
// just delete all information in buffer `b`
int RB_clearbuf(ringbuffer *b){
if(b->busy) return -1;
b->busy = 1;
b->head = 0;
b->tail = 0;
b->busy = 0;
return 1;
}

59
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/*
* This file is part of the bme280 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#if defined STM32F0
#include <stm32f0.h>
#elif defined STM32F1
#include <stm32f1.h>
#elif defined STM32F3
#include <stm32f3.h>
#endif
typedef struct{
uint8_t *data; // data buffer
const int length; // its length
int head; // head index
int tail; // tail index
volatile int busy; // == TRUE if buffer is busy now
} ringbuffer;
int RB_read(ringbuffer *b, uint8_t *s, int len);
int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len);
int RB_hasbyte(ringbuffer *b, uint8_t byte);
int RB_write(ringbuffer *b, const uint8_t *str, int l);
int RB_datalen(ringbuffer *b);
int RB_clearbuf(ringbuffer *b);

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/*
* This file is part of the canbus4bta project.
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "hardware.h"
#include "spi.h"
#include <string.h> // memcpy
#ifdef EBUG
#include "usb_dev.h"
#include "strfunc.h"
#endif
spiStatus spi_status = SPI_NOTREADY;
#define WAITX(x) do{volatile uint32_t wctr = 0; while((x) && (++wctr < 360000)) IWDG->KR = IWDG_REFRESH; if(wctr==360000){ DBG("timeout"); return 0;}}while(0)
// init SPI
void spi_setup(){
SPI1->CR1 = 0; // clear EN
SPI1->CR2 = 0;
// PB3 - SCK, BP4 - MISO, PB5 - MOSI; AF5 @PB3-5
GPIOB->AFR[0] = (GPIOB->AFR[0] & ~(GPIO_AFRL_AFRL3 | GPIO_AFRL_AFRL4 | GPIO_AFRL_AFRL5)) |
AFRf(5, 3) | AFRf(5, 4) | AFRf(5, 5);
GPIOB->MODER = (GPIOB->MODER & (MODER_CLR(3) & MODER_CLR(4) & MODER_CLR(5))) |
MODER_AF(3) | MODER_AF(4) | MODER_AF(5);
RCC->APB1RSTR = RCC_APB2RSTR_SPI1RST;
RCC->APB1RSTR = 0; // clear reset
RCC->APB2ENR |= RCC_APB2ENR_SPI1EN;
// software slave management (without hardware NSS pin); RX only; Baudrate = 0b110 - fpclk/128
// CPOL=1, CPHA=1:
SPI1->CR1 = SPI_CR1_CPOL | SPI_CR1_CPHA | SPI_CR1_SSM | SPI_CR1_SSI | SPI_CR1_MSTR | SPI_CR1_BR_2 | SPI_CR1_BR_1;
// hardware NSS management, RXNE after 8bit; 8bit transfer (default)
// DS=8bit; RXNE generates after 8bit of data in FIFO;
SPI1->CR2 = SPI_CR2_SSOE | SPI_CR2_FRXTH | SPI_CR2_DS_2|SPI_CR2_DS_1|SPI_CR2_DS_0;
spi_status = SPI_READY;
DBG("SPI works");
}
void spi_onoff(uint8_t on){
if(on) SPI1->CR1 |= SPI_CR1_SPE;
else SPI1->CR1 &= ~SPI_CR1_SPE;
}
// turn off given SPI channel and release GPIO
void spi_deinit(){
SPI1->CR1 = 0;
SPI1->CR2 = 0;
RCC->APB2ENR &= ~RCC_APB2ENR_SPI1EN;
GPIOB->AFR[0] = GPIOB->AFR[0] & ~(GPIO_AFRL_AFRL3 | GPIO_AFRL_AFRL4 | GPIO_AFRL_AFRL5);
GPIOB->MODER = GPIOB->MODER & (MODER_CLR(3) & MODER_CLR(4) & MODER_CLR(5));
spi_status = SPI_NOTREADY;
}
int spi_waitbsy(){
WAITX(SPI1->SR & SPI_SR_BSY);
return 1;
}
/**
* @brief spi_writeread - send data over SPI (change data array with received bytes)
* @param data - data to write/read
* @param n - length of data
* @return 0 if failed
*/
int spi_writeread(uint8_t *data, uint8_t n){
if(spi_status != SPI_READY || !data || !n){
DBG("not ready");
return 0;
}
// clear SPI Rx FIFO
for(int i = 0; i < 4; ++i) (void) SPI1->DR;
for(int x = 0; x < n; ++x){
WAITX(!(SPI1->SR & SPI_SR_TXE));
*((volatile uint8_t*)&SPI1->DR) = data[x];
WAITX(!(SPI1->SR & SPI_SR_RXNE));
data[x] = *((volatile uint8_t*)&SPI1->DR);
}
return 1;
}
// read data through SPI in read-only mode
int spi_read(uint8_t *data, uint8_t n){
if(spi_status != SPI_READY || !data || !n){
DBG("not ready");
return 0;
}
// clear SPI Rx FIFO
for(int i = 0; i < 4; ++i) (void) SPI1->DR;
spi_onoff(TRUE);
for(int x = 0; x < n; ++x){
if(x == n - 1) SPI1->CR1 &= ~SPI_CR1_RXONLY; // clear RXonly bit to stop CLK generation after next byte
WAITX(!(SPI1->SR & SPI_SR_RXNE));
data[x] = *((volatile uint8_t*)&SPI1->DR);
}
spi_onoff(FALSE); // turn off SPI
SPI1->CR1 |= SPI_CR1_RXONLY; // and return RXonly bit
return 1;
}

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/*
* This file is part of the canbus4bta project.
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
typedef enum{
SPI_NOTREADY,
SPI_READY,
SPI_BUSY
} spiStatus;
extern spiStatus spi_status;
void spi_onoff(uint8_t on);
void spi_deinit();
void spi_setup();
int spi_waitbsy();
int spi_writeread(uint8_t *data, uint8_t n);
int spi_read(uint8_t *data, uint8_t n);

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/*
* This file is part of the mlx90640 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <math.h> // isnan / isinf
#include "strfunc.h"
// hex line number for hexdumps
void u16s(uint16_t n, char *buf){
for(int j = 3; j > -1; --j){
register uint8_t q = n & 0xf;
n >>= 4;
if(q < 10) buf[j] = q + '0';
else buf[j] = q - 10 + 'a';
}
}
/**
* @brief hexdump - dump hex array by 16 bytes in string
* @param sendfun - function to send data
* @param arr - array to dump
* @param len - length of `arr`
*/
void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len){
char buf[64] = "0000 ", *bptr = &buf[6];
for(uint16_t l = 0; l < len; ++l, ++arr){
for(int16_t j = 1; j > -1; --j){
register uint8_t half = (*arr >> (4*j)) & 0x0f;
if(half < 10) *bptr++ = half + '0';
else *bptr++ = half - 10 + 'a';
}
if((l & 0xf) == 0xf){
*bptr++ = '\n';
*bptr = 0;
sendfun(buf);
u16s(l + 1, buf);
bptr = &buf[6];
}else *bptr++ = ' ';
}
if(bptr != &buf[6]){
*bptr++ = '\n';
*bptr = 0;
sendfun(buf);
}
}
// dump uint16_t by 8 values in string
void hexdump16(int (*sendfun)(const char *s), uint16_t *arr, uint16_t len){
char buf[64] = "0000 ", *bptr = &buf[6];
for(uint16_t l = 0; l < len; ++l, ++arr){
//uint16_t val = *arr;
u16s(*arr, bptr);
/*for(int16_t j = 3; j > -1; --j){
register uint8_t q = val & 0xf;
val >>= 4;
if(q < 10) bptr[j] = q + '0';
else bptr[j] = q - 10 + 'a';
}*/
bptr += 4;
if((l & 7) == 7){
*bptr++ = '\n';
*bptr = 0;
sendfun(buf);
u16s((l + 1)*2, buf); // number of byte, not word!
bptr = &buf[6];
}else *bptr++ = ' ';
}
if(bptr != &buf[6]){
*bptr++ = '\n';
*bptr = 0;
sendfun(buf);
}
}
/**
* @brief _2str - convert value into string buffer
* @param val - |value|
* @param minus - ==0 if value > 0
* @return buffer with number
*/
static const char *_2str(uint32_t val, uint8_t minus){
static char strbuf[12];
char *bufptr = &strbuf[11];
*bufptr = 0;
if(!val){
*(--bufptr) = '0';
}else{
while(val){
uint32_t x = val / 10;
*(--bufptr) = (val - 10*x) + '0';
val = x;
//*(--bufptr) = val % 10 + '0';
//val /= 10;
}
}
if(minus) *(--bufptr) = '-';
return bufptr;
}
// return string with number `val`
const char *u2str(uint32_t val){
return _2str(val, 0);
}
const char *i2str(int32_t i){
uint8_t minus = 0;
uint32_t val;
if(i < 0){
minus = 1;
val = -i;
}else val = i;
return _2str(val, minus);
}
/**
* @brief uhex2str - print 32bit unsigned int as hex
* @param val - value
* @return string with number
*/
const char *uhex2str(uint32_t val){
static char buf[12] = "0x";
int npos = 2;
uint8_t *ptr = (uint8_t*)&val + 3;
int8_t i, j, z=1;
for(i = 0; i < 4; ++i, --ptr){
if(*ptr == 0){ // omit leading zeros
if(i == 3) z = 0;
if(z) continue;
}
else z = 0;
for(j = 1; j > -1; --j){
uint8_t half = (*ptr >> (4*j)) & 0x0f;
if(half < 10) buf[npos++] = half + '0';
else buf[npos++] = half - 10 + 'a';
}
}
buf[npos] = 0;
return buf;
}
/**
* @brief omit_spaces - eliminate leading spaces and other trash in string
* @param buf - string
* @return - pointer to first character in `buf` > ' '
*/
char *omit_spaces(const char *buf){
while(*buf){
if(*buf > ' ') break;
++buf;
}
return (char*)buf;
}
/**
* @brief getdec - read decimal number & return pointer to next non-number symbol
* @param buf - string
* @param N - number read
* @return Next non-number symbol. In case of overflow return `buf` and N==0xffffffff
*/
static const char *getdec(const char *buf, uint32_t *N){
char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '9'){
break;
}
if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
*N = 0xffffff;
return start;
}
num *= 10;
num += c - '0';
++buf;
}
*N = num;
return buf;
}
// read hexadecimal number (without 0x prefix!)
static const char *gethex(const char *buf, uint32_t *N){
const char *start = buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
uint8_t M = 0;
if(c >= '0' && c <= '9'){
M = '0';
}else if(c >= 'A' && c <= 'F'){
M = 'A' - 10;
}else if(c >= 'a' && c <= 'f'){
M = 'a' - 10;
}
if(M){
if(num & 0xf0000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 4;
num += c - M;
}else{
break;
}
++buf;
}
*N = num;
return buf;
}
// read octal number (without 0 prefix!)
static const char *getoct(const char *buf, uint32_t *N){
const char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '7'){
break;
}
if(num & 0xe0000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 3;
num += c - '0';
++buf;
}
*N = num;
return buf;
}
// read binary number (without b prefix!)
static const char *getbin(const char *buf, uint32_t *N){
const char *start = (char*)buf;
uint32_t num = 0;
while(*buf){
char c = *buf;
if(c < '0' || c > '1'){
break;
}
if(num & 0x80000000){ // overflow
*N = 0xffffff;
return start;
}
num <<= 1;
if(c == '1') num |= 1;
++buf;
}
*N = num;
return buf;
}
/**
* @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
* @param buf - buffer with number and so on
* @param N - the number read
* @return pointer to first non-number symbol in buf
* (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
*/
const char *getnum(const char *txt, uint32_t *N){
const char *nxt = NULL;
const char *s = omit_spaces(txt);
if(*s == '0'){ // hex, oct or 0
if(s[1] == 'x' || s[1] == 'X'){ // hex
nxt = gethex(s+2, N);
if(nxt == s+2) nxt = (char*)txt;
}else if(s[1] > '0'-1 && s[1] < '8'){ // oct
nxt = getoct(s+1, N);
if(nxt == s+1) nxt = (char*)txt;
}else{ // 0
nxt = s+1;
*N = 0;
}
}else if(*s == 'b' || *s == 'B'){
nxt = getbin(s+1, N);
if(nxt == s+1) nxt = (char*)txt;
}else{
nxt = getdec(s, N);
if(nxt == s) nxt = (char*)txt;
}
return nxt;
}
// get signed integer
const char *getint(const char *txt, int32_t *I){
const char *s = omit_spaces(txt);
int32_t sign = 1;
uint32_t U;
if(*s == '-'){
sign = -1;
++s;
}
const char *nxt = getnum(s, &U);
if(nxt == s) return txt;
if(U & 0x80000000) return txt; // overfull
*I = sign * (int32_t)U;
return nxt;
}
// be careful: if pow10 would be bigger you should change str[] size!
static const float pwr10[] = {1.f, 10.f, 100.f, 1000.f, 10000.f};
static const float rounds[] = {0.5f, 0.05f, 0.005f, 0.0005f, 0.00005f};
#define P10L (sizeof(pwr10)/sizeof(uint32_t) - 1)
char *float2str(float x, uint8_t prec){
static char str[16] = {0}; // -117.5494E-36\0 - 14 symbols max!
if(prec > P10L) prec = P10L;
if(isnan(x)){ memcpy(str, "NAN", 4); return str;}
else{
int i = isinf(x);
if(i){memcpy(str, "-INF", 5); if(i == 1) return str+1; else return str;}
}
char *s = str + 14; // go to end of buffer
uint8_t minus = 0;
if(x < 0){
x = -x;
minus = 1;
}
int pow = 0; // xxxEpow
// now convert float to 1.xxxE3y
while(x > 1000.f){
x /= 1000.f;
pow += 3;
}
if(x > 0.) while(x < 1.){
x *= 1000.f;
pow -= 3;
}
// print Eyy
if(pow){
uint8_t m = 0;
if(pow < 0){pow = -pow; m = 1;}
while(pow){
register int p10 = pow/10;
*s-- = '0' + (pow - 10*p10);
pow = p10;
}
if(m) *s-- = '-';
*s-- = 'E';
}
// now our number is in [1, 1000]
uint32_t units;
if(prec){
units = (uint32_t) x;
uint32_t decimals = (uint32_t)((x-units+rounds[prec])*pwr10[prec]);
// print decimals
while(prec){
register int d10 = decimals / 10;
*s-- = '0' + (decimals - 10*d10);
decimals = d10;
--prec;
}
// decimal point
*s-- = '.';
}else{ // without decimal part
units = (uint32_t) (x + 0.5);
}
// print main units
if(units == 0) *s-- = '0';
else while(units){
register uint32_t u10 = units / 10;
*s-- = '0' + (units - 10*u10);
units = u10;
}
if(minus) *s-- = '-';
return s+1;
}

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/*
* This file is part of the mlx90640 project.
* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include <string.h>
#include "usb_dev.h"
#define printu(x) do{USB_sendstr(u2str(x));}while(0)
#define printi(x) do{USB_sendstr(i2str(x));}while(0)
#define printuhex(x) do{USB_sendstr(uhex2str(x));}while(0)
#define printfl(x,n) do{USB_sendstr(float2str(x, n));}while(0)
void u16s(uint16_t n, char *buf);
void hexdump16(int (*sendfun)(const char *s), uint16_t *arr, uint16_t len);
void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
const char *u2str(uint32_t val);
const char *i2str(int32_t i);
const char *uhex2str(uint32_t val);
const char *getnum(const char *txt, uint32_t *N);
char *omit_spaces(const char *buf);
const char *getint(const char *txt, int32_t *I);
char *float2str(float x, uint8_t prec);

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "usb_descr.h"
// low/high for uint16_t
#define L16(x) (x & 0xff)
#define H16(x) (x >> 8)
static const uint8_t USB_DeviceDescriptor[] = {
USB_DT_DEVICE_SIZE, // bLength
USB_DT_DEVICE, // bDescriptorType
L16(bcdUSB), // bcdUSB_L
H16(bcdUSB), // bcdUSB_H
USB_CLASS_MISC, // bDeviceClass
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0BUFSZ, // bMaxPacketSize
L16(idVendor), // idVendor_L
H16(idVendor), // idVendor_H
L16(idProduct), // idProduct_L
H16(idProduct), // idProduct_H
L16(bcdDevice_Ver), // bcdDevice_Ver_L
H16(bcdDevice_Ver), // bcdDevice_Ver_H
iMANUFACTURER_DESCR, // iManufacturer - indexes of string descriptors in array
iPRODUCT_DESCR, // iProduct
iSERIAL_DESCR, // iSerial
bNumConfigurations // bNumConfigurations
};
static const uint8_t USB_DeviceQualifierDescriptor[] = {
USB_DT_QUALIFIER_SIZE, //bLength
USB_DT_QUALIFIER, // bDescriptorType
L16(bcdUSB), // bcdUSB_L
H16(bcdUSB), // bcdUSB_H
USB_CLASS_PER_INTERFACE, // bDeviceClass
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0BUFSZ, // bMaxPacketSize0
bNumConfigurations, // bNumConfigurations
0 // Reserved
};
#define wTotalLength (USB_DT_CONFIG_SIZE + (bNumInterfaces * USB_DT_INTERFACE_SIZE) + (bTotNumEndpoints * USB_DT_ENDPOINT_SIZE) + (bNumCsInterfaces * USB_DT_CS_INTERFACE_SIZE) - 1)
static const uint8_t USB_ConfigDescriptor[] = {
// Configuration Descriptor
USB_DT_CONFIG_SIZE, // bLength: Configuration Descriptor size
USB_DT_CONFIG, // bDescriptorType: Configuration
L16(wTotalLength), // wTotalLength.L :no of returned bytes
H16(wTotalLength), // wTotalLength.H
bNumInterfaces, // bNumInterfaces
1, // bConfigurationValue: Current configuration value
0, // iConfiguration: Index of string descriptor describing the configuration or 0
BusPowered, // bmAttributes - Bus powered
50, // MaxPower in 2mA units
//---------------------------------------------------------------------------
// Virtual command Interface Descriptor
USB_DT_INTERFACE_SIZE, // bLength: Interface Descriptor size
USB_DT_INTERFACE, // bDescriptorType: Interface
0, // bInterfaceNumber: Number of Interface
0, // bAlternateSetting: Alternate setting
1, // bNumEndpoints: one for this
USB_CLASS_COMM, // bInterfaceClass
2, // bInterfaceSubClass: ACM
1, // bInterfaceProtocol: Common AT commands
iINTERFACE_DESCR1, // iInterface
// ---- CS Interfaces
USB_DT_CS_INTERFACE_SIZE, // bLength
USB_DT_CS_INTERFACE, // bDescriptorType: CS_INTERFACE
0, // bDescriptorSubtype: Header Func Desc
0x10, // bcdCDC: spec release number
1, // bDataInterface
USB_DT_CS_INTERFACE_SIZE, // bLength
USB_DT_CS_INTERFACE, // bDescriptorType: CS_INTERFACE
1, // bDescriptorSubtype: Call Management Func Desc
0, // bmCapabilities: D0+D1
1, // bDataInterface
USB_DT_CS_INTERFACE_SIZE-1, // bLength
USB_DT_CS_INTERFACE, // bDescriptorType: CS_INTERFACE
2, // bDescriptorSubtype: Abstract Control Management desc
2, // bmCapabilities
USB_DT_CS_INTERFACE_SIZE, // bLength
USB_DT_CS_INTERFACE, // bDescriptorType: CS_INTERFACE
6, // bDescriptorSubtype: Union func desc
0, // bMasterInterface: Communication class interface
1, // bSlaveInterface0: Data Class Interface
// Virtual endpoint 1 Descriptor
USB_DT_ENDPOINT_SIZE, // bLength: Endpoint Descriptor size
USB_DT_ENDPOINT, // bDescriptorType: Endpoint
0x8A, // bEndpointAddress IN10
USB_BM_ATTR_INTERRUPT, // bmAttributes: Interrupt
L16(USB_EP1BUFSZ), // wMaxPacketSize LO
H16(USB_EP1BUFSZ), // wMaxPacketSize HI
0x10, // bInterval: 16ms
//---------------------------------------------------------------------------
// Data interface
USB_DT_INTERFACE_SIZE, // bLength: Interface Descriptor size
USB_DT_INTERFACE, // bDescriptorType: Interface
1, // bInterfaceNumber: Number of Interface
0, // bAlternateSetting: Alternate setting
2, // bNumEndpoints: in and out
USB_CLASS_DATA, // bInterfaceClass
2, // bInterfaceSubClass: ACM
0, // bInterfaceProtocol
0, // iInterface
//Endpoint IN1 Descriptor
USB_DT_ENDPOINT_SIZE, // bLength: Endpoint Descriptor size
USB_DT_ENDPOINT, // bDescriptorType: Endpoint
0x81, // bEndpointAddress: IN1
USB_BM_ATTR_BULK, // bmAttributes: Bulk
L16(USB_TXBUFSZ), // wMaxPacketSize LO
H16(USB_TXBUFSZ), // wMaxPacketSize HI
0, // bInterval: ignore for Bulk transfer
// Endpoint OUT1 Descriptor
USB_DT_ENDPOINT_SIZE, // bLength: Endpoint Descriptor size
USB_DT_ENDPOINT, // bDescriptorType: Endpoint
0x01, // bEndpointAddress: OUT1
USB_BM_ATTR_BULK, // bmAttributes: Bulk
L16(USB_RXBUFSZ), // wMaxPacketSize LO
H16(USB_RXBUFSZ), // wMaxPacketSize HI
0, // bInterval: ignore for Bulk transfer
};
//const uint8_t HID_ReportDescriptor[];
_USB_LANG_ID_(LD, LANG_US);
_USB_STRING_(SD, u"0.0.1");
_USB_STRING_(MD, u"eddy@sao.ru");
_USB_STRING_(PD, u"BME280 SPI management");
_USB_STRING_(ID, u"bme280");
static const void* const StringDescriptor[iDESCR_AMOUNT] = {
[iLANGUAGE_DESCR] = &LD,
[iMANUFACTURER_DESCR] = &MD,
[iPRODUCT_DESCR] = &PD,
[iSERIAL_DESCR] = &SD,
[iINTERFACE_DESCR1] = &ID
};
static void wr0(const uint8_t *buf, uint16_t size, uint16_t askedsize){
if(askedsize < size) size = askedsize; // shortened request
if(size < USB_EP0BUFSZ){
EP_WriteIRQ(0, buf, size);
return;
}
while(size){
uint16_t l = size;
if(l > USB_EP0BUFSZ) l = USB_EP0BUFSZ;
EP_WriteIRQ(0, buf, l);
buf += l;
size -= l;
uint8_t needzlp = (l == USB_EP0BUFSZ) ? 1 : 0;
if(size || needzlp){ // send last data buffer
uint16_t epstatus = KEEP_DTOG(USB->EPnR[0]);
// keep DTOGs, clear CTR_RX,TX, set TX VALID, leave stat_Rx
USB->EPnR[0] = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX|USB_EPnR_STAT_RX))
^ USB_EPnR_STAT_TX;
uint32_t ctr = 1000000;
while(--ctr && (USB->ISTR & USB_ISTR_CTR) == 0){IWDG->KR = IWDG_REFRESH;};
if((USB->ISTR & USB_ISTR_CTR) == 0){
return;
}
if(needzlp) EP_WriteIRQ(0, NULL, 0);
}
}
}
void get_descriptor(config_pack_t *pack){
uint8_t descrtype = pack->wValue >> 8,
descridx = pack->wValue & 0xff;
switch(descrtype){
case DEVICE_DESCRIPTOR:
wr0(USB_DeviceDescriptor, sizeof(USB_DeviceDescriptor), pack->wLength);
break;
case CONFIGURATION_DESCRIPTOR:
wr0(USB_ConfigDescriptor, sizeof(USB_ConfigDescriptor), pack->wLength);
break;
case STRING_DESCRIPTOR:
if(descridx < iDESCR_AMOUNT){
wr0((const uint8_t *)StringDescriptor[descridx], *((uint8_t*)StringDescriptor[descridx]), pack->wLength);
}else{
EP_WriteIRQ(0, NULL, 0);
}
break;
case DEVICE_QUALIFIER_DESCRIPTOR:
wr0(USB_DeviceQualifierDescriptor, sizeof(USB_DeviceQualifierDescriptor), pack->wLength);
break;
/* case HID_REPORT_DESCRIPTOR:
wr0(HID_ReportDescriptor, sizeof(HID_ReportDescriptor), pack->wLength);
break;*/
default:
break;
}
}

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include "usb_lib.h"
// definition of parts common for USB_DeviceDescriptor & USB_DeviceQualifierDescriptor
// bcdUSB: 1.10
#define bcdUSB 0x0110
// Class - Misc (EF), subclass - common (2), protocol - interface association descr (1)
#define bDeviceSubClass 0x02
#define bDeviceProtocol 0x01
#define idVendor 0x0483
#define idProduct 0x5740
#define bcdDevice_Ver 0x0200
#define bNumConfigurations 1
// amount of interfaces and endpoints (except 0) used
#define bNumInterfaces 2
#define bTotNumEndpoints 3
#define bNumCsInterfaces 4
// powered
#define BusPowered (1<<7)
#define SelfPowered (1<<6)
#define RemoteWakeup (1<<5)
// buffer sizes
// for USB FS EP0 buffers are from 8 to 64 bytes long
#define USB_EP0BUFSZ 64
#define USB_EP1BUFSZ 10
// Rx/Tx EPs
#define USB_RXBUFSZ 64
#define USB_TXBUFSZ 64
// string descriptors
enum{
iLANGUAGE_DESCR,
iMANUFACTURER_DESCR,
iPRODUCT_DESCR,
iSERIAL_DESCR,
iINTERFACE_DESCR1,
iDESCR_AMOUNT
};
void get_descriptor(config_pack_t *pack);

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include "ringbuffer.h"
#include "usb_descr.h"
#include "usb_dev.h"
// Class-Specific Control Requests
#define SEND_ENCAPSULATED_COMMAND 0x00 // unused
#define GET_ENCAPSULATED_RESPONSE 0x01 // unused
#define SET_COMM_FEATURE 0x02 // unused
#define GET_COMM_FEATURE 0x03 // unused
#define CLEAR_COMM_FEATURE 0x04 // unused
#define SET_LINE_CODING 0x20
#define GET_LINE_CODING 0x21
#define SET_CONTROL_LINE_STATE 0x22
#define SEND_BREAK 0x23
// control line states
#define CONTROL_DTR 0x01
#define CONTROL_RTS 0x02
// inbuf overflow when receiving
static volatile uint8_t bufovrfl = 0;
// receive buffer: hold data until chkin() call
static uint8_t volatile rcvbuf[USB_RXBUFSZ];
static uint8_t volatile rcvbuflen = 0;
// line coding
usb_LineCoding WEAK lineCoding = {115200, 0, 0, 8};
// CDC configured and ready to use
volatile uint8_t CDCready = 0;
// ring buffers for incoming and outgoing data
static uint8_t obuf[RBOUTSZ], ibuf[RBINSZ];
static volatile ringbuffer rbout = {.data = obuf, .length = RBOUTSZ, .head = 0, .tail = 0};
static volatile ringbuffer rbin = {.data = ibuf, .length = RBINSZ, .head = 0, .tail = 0};
// last send data size
static volatile int lastdsz = 0;
static void chkin(){
if(bufovrfl) return; // allow user to know that previous buffer was overflowed and cleared
if(!rcvbuflen) return;
int w = RB_write((ringbuffer*)&rbin, (uint8_t*)rcvbuf, rcvbuflen);
if(w < 0){
return;
}
if(w != rcvbuflen) bufovrfl = 1;
rcvbuflen = 0;
uint16_t status = KEEP_DTOG(USB->EPnR[1]); // don't change DTOG
USB->EPnR[1] = (status & ~(USB_EPnR_STAT_TX|USB_EPnR_CTR_RX)) ^ USB_EPnR_STAT_RX; // prepare to get next data portion
}
// called from transmit EP to send next data portion or by user - when new transmission starts
static void send_next(){
uint8_t usbbuff[USB_TXBUFSZ];
int buflen = RB_read((ringbuffer*)&rbout, (uint8_t*)usbbuff, USB_TXBUFSZ);
if(buflen == 0){
if(lastdsz == 64) EP_Write(1, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
lastdsz = 0;
return;
}else if(buflen < 0){
lastdsz = 0;
return;
}
EP_Write(1, (uint8_t*)usbbuff, buflen);
lastdsz = buflen;
}
// data IN/OUT handler
static void rxtx_handler(){
uint16_t epstatus = KEEP_DTOG(USB->EPnR[1]);
if(RX_FLAG(epstatus)){ // receive data
if(rcvbuflen){
bufovrfl = 1; // lost last data
rcvbuflen = 0;
}
rcvbuflen = EP_Read(1, (uint8_t*)rcvbuf);
USB->EPnR[1] = epstatus & ~(USB_EPnR_CTR_RX | USB_EPnR_STAT_RX | USB_EPnR_STAT_TX); // keep RX in STALL state until read data
chkin(); // try to write current data into RXbuf if it's not busy
}else{ // tx successfull
USB->EPnR[1] = (epstatus & ~(USB_EPnR_CTR_TX | USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
send_next();
}
}
// weak handlers: change them somewhere else if you want to setup USART
// SET_LINE_CODING
void WEAK linecoding_handler(usb_LineCoding *lc){
lineCoding = *lc;
}
// SET_CONTROL_LINE_STATE
void WEAK clstate_handler(uint16_t val){
CDCready = val; // CONTROL_DTR | CONTROL_RTS -> interface connected; 0 -> disconnected
}
// SEND_BREAK
void WEAK break_handler(){
CDCready = 0;
}
// USB is configured: setup endpoints
void set_configuration(){
EP_Init(1, EP_TYPE_BULK, USB_TXBUFSZ, USB_RXBUFSZ, rxtx_handler); // IN1 and OUT1
}
// PL2303 CLASS request
void usb_class_request(config_pack_t *req, uint8_t *data, uint16_t datalen){
uint8_t recipient = REQUEST_RECIPIENT(req->bmRequestType);
uint8_t dev2host = (req->bmRequestType & 0x80) ? 1 : 0;
switch(recipient){
case REQ_RECIPIENT_INTERFACE:
switch(req->bRequest){
case SET_LINE_CODING:
if(!data || !datalen) break; // wait for data
if(datalen == sizeof(usb_LineCoding))
linecoding_handler((usb_LineCoding*)data);
break;
case GET_LINE_CODING:
EP_WriteIRQ(0, (uint8_t*)&lineCoding, sizeof(lineCoding));
break;
case SET_CONTROL_LINE_STATE:
clstate_handler(req->wValue);
break;
case SEND_BREAK:
break_handler();
break;
default:
break;
}
break;
default:
if(dev2host) EP_WriteIRQ(0, NULL, 0);
}
if(!dev2host) EP_WriteIRQ(0, NULL, 0);
}
// blocking send full content of ring buffer
int USB_sendall(){
while(lastdsz > 0){
if(!CDCready) return FALSE;
}
return TRUE;
}
// put `buf` into queue to send
int USB_send(const uint8_t *buf, int len){
if(!buf || !CDCready || !len) return FALSE;
while(len){
int a = RB_write((ringbuffer*)&rbout, buf, len);
if(a > 0){
len -= a;
buf += a;
} else if (a < 0) continue; // do nothing if buffer is in reading state
if(lastdsz == 0) send_next(); // need to run manually - all data sent, so no IRQ on IN
}
return TRUE;
}
int USB_putbyte(uint8_t byte){
if(!CDCready) return FALSE;
int l = 0;
while((l = RB_write((ringbuffer*)&rbout, &byte, 1)) != 1){
if(l < 0) continue;
}
if(lastdsz == 0) send_next(); // need to run manually - all data sent, so no IRQ on IN
return TRUE;
}
int USB_sendstr(const char *string){
if(!string || !CDCready) return FALSE;
int len = 0;
const char *b = string;
while(*b++) ++len;
if(!len) return FALSE;
return USB_send((const uint8_t*)string, len);
}
/**
* @brief USB_receive - get binary data from receiving ring-buffer
* @param buf (i) - buffer for received data
* @param len - length of `buf`
* @return amount of received bytes (negative, if overfull happened)
*/
int USB_receive(uint8_t *buf, int len){
chkin();
if(bufovrfl){
while(1 != RB_clearbuf((ringbuffer*)&rbin));
bufovrfl = 0;
return -1;
}
int sz = RB_read((ringbuffer*)&rbin, buf, len);
if(sz < 0) return 0; // buffer in writting state
return sz;
}
/**
* @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
* @param buf - receiving buffer
* @param len - its length
* @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
*/
int USB_receivestr(char *buf, int len){
chkin();
if(bufovrfl){
while(1 != RB_clearbuf((ringbuffer*)&rbin));
bufovrfl = 0;
return -1;
}
int l = RB_readto((ringbuffer*)&rbin, '\n', (uint8_t*)buf, len);
if(l < 1){
if(rbin.length == RB_datalen((ringbuffer*)&rbin)){ // buffer is full but no '\n' found
while(1 != RB_clearbuf((ringbuffer*)&rbin));
return -1;
}
return 0;
}
if(l == 0) return 0;
buf[l-1] = 0; // replace '\n' with strend
return l;
}

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stm32f3.h>
#include "usb_lib.h"
typedef struct {
uint32_t dwDTERate;
uint8_t bCharFormat;
#define USB_CDC_1_STOP_BITS 0
#define USB_CDC_1_5_STOP_BITS 1
#define USB_CDC_2_STOP_BITS 2
uint8_t bParityType;
#define USB_CDC_NO_PARITY 0
#define USB_CDC_ODD_PARITY 1
#define USB_CDC_EVEN_PARITY 2
#define USB_CDC_MARK_PARITY 3
#define USB_CDC_SPACE_PARITY 4
uint8_t bDataBits;
} __attribute__ ((packed)) usb_LineCoding;
extern usb_LineCoding lineCoding;
extern volatile uint8_t CDCready;
void break_handler();
void clstate_handler(uint16_t val);
void linecoding_handler(usb_LineCoding *lc);
// sizes of ringbuffers for outgoing and incoming data
#define RBOUTSZ (1024)
#define RBINSZ (1024)
#ifdef EBUG
#define DBG(x) USB_sendstr(x)
#else
#define DBG()
#endif
#define newline() USB_putbyte('\n')
#define USND(s) do{USB_sendstr(s); USB_putbyte('\n');}while(0)
int USB_sendall();
int USB_send(const uint8_t *buf, int len);
int USB_putbyte(uint8_t byte);
int USB_sendstr(const char *string);
int USB_receive(uint8_t *buf, int len);
int USB_receivestr(char *buf, int len);

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include "usb_lib.h"
#include "usb_descr.h"
#include "usb_dev.h"
static ep_t endpoints[STM32ENDPOINTS];
static uint16_t USB_Addr = 0;
static uint8_t setupdatabuf[EP0DATABUF_SIZE];
static config_pack_t *setup_packet = (config_pack_t*) setupdatabuf;
volatile uint8_t usbON = 0; // device is configured and active
static uint16_t configuration = 0; // reply for GET_CONFIGURATION (==1 if configured)
static inline void std_d2h_req(){
uint16_t st = 0;
switch(setup_packet->bRequest){
case GET_DESCRIPTOR:
get_descriptor(setup_packet);
break;
case GET_STATUS:
EP_WriteIRQ(0, (uint8_t *)&st, 2); // send status: Bus Powered
break;
case GET_CONFIGURATION:
EP_WriteIRQ(0, (uint8_t*)&configuration, 1);
break;
default:
EP_WriteIRQ(0, NULL, 0);
break;
}
}
static inline void std_h2d_req(){
switch(setup_packet->bRequest){
case SET_ADDRESS:
// new address will be assigned later - after acknowlegement or request to host
USB_Addr = setup_packet->wValue;
break;
case SET_CONFIGURATION:
// Now device configured
configuration = setup_packet->wValue;
set_configuration();
usbON = 1;
break;
default:
break;
}
}
void WEAK usb_standard_request(){
uint8_t recipient = REQUEST_RECIPIENT(setup_packet->bmRequestType);
uint8_t dev2host = (setup_packet->bmRequestType & 0x80) ? 1 : 0;
switch(recipient){
case REQ_RECIPIENT_DEVICE:
if(dev2host){
std_d2h_req();
}else{
std_h2d_req();
}
break;
case REQ_RECIPIENT_INTERFACE:
if(dev2host && setup_packet->bRequest == GET_DESCRIPTOR){
get_descriptor(setup_packet);
}
break;
case REQ_RECIPIENT_ENDPOINT:
if(setup_packet->bRequest == CLEAR_FEATURE){
}else{ /* wrong */ }
break;
default:
break;
}
if(!dev2host) EP_WriteIRQ(0, NULL, 0);
}
void WEAK usb_class_request(config_pack_t *req, uint8_t _U_ *data, uint16_t _U_ datalen){
switch(req->bRequest){
case GET_INTERFACE:
break;
case SET_CONFIGURATION: // set featuring by req->wValue
break;
default:
break;
}
if(0 == (setup_packet->bmRequestType & 0x80)) // host2dev
EP_WriteIRQ(0, NULL, 0);
}
void WEAK usb_vendor_request(config_pack_t _U_ *packet, uint8_t _U_ *data, uint16_t _U_ datalen){
if(0 == (setup_packet->bmRequestType & 0x80)) // host2dev
EP_WriteIRQ(0, NULL, 0);
}
/*
bmRequestType: 76543210
7 direction: 0 - host->device, 1 - device->host
65 type: 0 - standard, 1 - class, 2 - vendor
4..0 getter: 0 - device, 1 - interface, 2 - endpoint, 3 - other
*/
/**
* Endpoint0 (control) handler
*/
static void EP0_Handler(){
uint8_t ep0dbuflen = 0;
uint8_t ep0databuf[EP0DATABUF_SIZE];
uint16_t epstatus = KEEP_DTOG(USB->EPnR[0]); // EP0R on input -> return this value after modifications
int rxflag = RX_FLAG(epstatus);
//if(rxflag){ }
// check direction
if(USB->ISTR & USB_ISTR_DIR){ // OUT interrupt - receive data, CTR_RX==1 (if CTR_TX == 1 - two pending transactions: receive following by transmit)
if(epstatus & USB_EPnR_SETUP){ // setup packet -> copy data to conf_pack
EP_Read(0, setupdatabuf);
// interrupt handler will be called later
}else if(epstatus & USB_EPnR_CTR_RX){ // data packet -> push received data to ep0databuf
//if(endpoints[0].rx_cnt){ }
ep0dbuflen = EP_Read(0, ep0databuf);
}
}
if(rxflag){
uint8_t reqtype = REQUEST_TYPE(setup_packet->bmRequestType);
switch(reqtype){
case REQ_TYPE_STANDARD:
if(SETUP_FLAG(epstatus)){
usb_standard_request();
}else{ }
break;
case REQ_TYPE_CLASS:
usb_class_request(setup_packet, ep0databuf, ep0dbuflen);
break;
case REQ_TYPE_VENDOR:
usb_vendor_request(setup_packet, ep0databuf, ep0dbuflen);
break;
default:
EP_WriteIRQ(0, NULL, 0);
break;
}
}
if(TX_FLAG(epstatus)){
// now we can change address after enumeration
if ((USB->DADDR & USB_DADDR_ADD) != USB_Addr){
USB->DADDR = USB_DADDR_EF | USB_Addr;
usbON = 0;
}
}
//epstatus = KEEP_DTOG(USB->EPnR[0]);
if(rxflag) epstatus ^= USB_EPnR_STAT_TX; // start ZLP or data transmission
else epstatus &= ~USB_EPnR_STAT_TX; // or leave unchanged
// keep DTOGs, clear CTR_RX,TX, set RX VALID
USB->EPnR[0] = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX)) ^ USB_EPnR_STAT_RX;
}
/**
* Write data to EP buffer (called from IRQ handler)
* @param number - EP number
* @param *buf - array with data
* @param size - its size
*/
void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
if(size > endpoints[number].txbufsz) size = endpoints[number].txbufsz;
uint16_t N2 = (size + 1) >> 1;
// the buffer is 16-bit, so we should copy data as it would be uint16_t
uint16_t *buf16 = (uint16_t *)buf;
#if defined USB1_16
// very bad: what if `size` is odd?
uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
for(int i = 0; i < N2; ++i, ++out){
*out = buf16[i];
}
#elif defined USB2_16
// use memcpy instead?
for(int i = 0; i < N2; i++){
endpoints[number].tx_buf[i] = buf16[i];
}
#else
#error "Define USB1_16 or USB2_16"
#endif
USB_BTABLE->EP[number].USB_COUNT_TX = size;
}
/**
* Write data to EP buffer (called outside IRQ handler)
* @param number - EP number
* @param *buf - array with data
* @param size - its size
*/
void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size){
EP_WriteIRQ(number, buf, size);
uint16_t epstatus = KEEP_DTOG(USB->EPnR[number]);
// keep DTOGs and RX stat, clear CTR_TX & set TX VALID to start transmission
USB->EPnR[number] = (epstatus & ~(USB_EPnR_CTR_TX | USB_EPnR_STAT_RX)) ^ USB_EPnR_STAT_TX;
}
/*
* Copy data from EP buffer into user buffer area
* @param *buf - user array for data
* @return amount of data read
*/
int EP_Read(uint8_t number, uint8_t *buf){
int sz = endpoints[number].rx_cnt;
if(!sz) return 0;
endpoints[number].rx_cnt = 0;
#if defined USB1_16
int n = (sz + 1) >> 1;
uint32_t *in = (uint32_t*)endpoints[number].rx_buf;
uint16_t *out = (uint16_t*)buf;
for(int i = 0; i < n; ++i, ++in)
out[i] = *(uint16_t*)in;
#elif defined USB2_16
// use memcpy instead?
for(int i = 0; i < sz; ++i)
buf[i] = endpoints[number].rx_buf[i];
#else
#error "Define USB1_16 or USB2_16"
#endif
return sz;
}
static uint16_t lastaddr = LASTADDR_DEFAULT;
/**
* Endpoint initialisation
* @param number - EP num (0...7)
* @param type - EP type (EP_TYPE_BULK, EP_TYPE_CONTROL, EP_TYPE_ISO, EP_TYPE_INTERRUPT)
* @param txsz - transmission buffer size @ USB/CAN buffer
* @param rxsz - reception buffer size @ USB/CAN buffer
* @param uint16_t (*func)(ep_t *ep) - EP handler function
* @return 0 if all OK
*/
int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)(ep_t ep)){
if(number >= STM32ENDPOINTS) return 4; // out of configured amount
if(txsz > USB_BTABLE_SIZE/ACCESSZ || rxsz > USB_BTABLE_SIZE/ACCESSZ) return 1; // buffer too large
if(lastaddr + txsz + rxsz >= USB_BTABLE_SIZE/ACCESSZ) return 2; // out of btable
USB->EPnR[number] = (type << 9) | (number & USB_EPnR_EA);
USB->EPnR[number] ^= USB_EPnR_STAT_RX | USB_EPnR_STAT_TX_1;
if(rxsz & 1) return 3; // wrong rx buffer size
uint16_t countrx = 0;
if(rxsz < 64) countrx = rxsz / 2;
else{
if(rxsz & 0x1f) return 3; // should be multiple of 32
countrx = 31 + rxsz / 32;
}
USB_BTABLE->EP[number].USB_ADDR_TX = lastaddr;
endpoints[number].tx_buf = (uint16_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
endpoints[number].txbufsz = txsz;
lastaddr += txsz;
USB_BTABLE->EP[number].USB_COUNT_TX = 0;
USB_BTABLE->EP[number].USB_ADDR_RX = lastaddr;
endpoints[number].rx_buf = (uint8_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
lastaddr += rxsz;
USB_BTABLE->EP[number].USB_COUNT_RX = countrx << 10;
endpoints[number].func = func;
return 0;
}
// standard IRQ handler
void USB_IRQ(){
uint32_t CNTR = USB->CNTR;
USB->CNTR = 0;
if(USB->ISTR & USB_ISTR_RESET){
usbON = 0;
// Reinit registers
CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM | USB_CNTR_SUSPM;
// Endpoint 0 - CONTROL
// ON USB LS size of EP0 may be 8 bytes, but on FS it should be 64 bytes!
lastaddr = LASTADDR_DEFAULT;
// clear address, leave only enable bit
USB->DADDR = USB_DADDR_EF;
USB->ISTR = ~USB_ISTR_RESET;
if(EP_Init(0, EP_TYPE_CONTROL, USB_EP0BUFSZ, USB_EP0BUFSZ, EP0_Handler)){
return;
};
}
if(USB->ISTR & USB_ISTR_CTR){
// EP number
uint8_t n = USB->ISTR & USB_ISTR_EPID;
// copy received bytes amount
endpoints[n].rx_cnt = USB_BTABLE->EP[n].USB_COUNT_RX & 0x3FF; // low 10 bits is counter
// call EP handler
if(endpoints[n].func) endpoints[n].func();
}
if(USB->ISTR & USB_ISTR_WKUP){ // wakeup
#ifndef STM32F0
CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM); // clear suspend flags
#else
CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LPMODE | USB_CNTR_WKUPM);
#endif
USB->ISTR = ~USB_ISTR_WKUP;
}
if(USB->ISTR & USB_ISTR_SUSP){ // suspend -> still no connection, may sleep
usbON = 0;
#ifndef STM32F0
CNTR |= USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM;
#else
CNTR |= USB_CNTR_FSUSP | USB_CNTR_LPMODE | USB_CNTR_WKUPM;
#endif
CNTR &= ~(USB_CNTR_SUSPM);
USB->ISTR = ~USB_ISTR_SUSP;
}
USB->CNTR = CNTR; // rewoke interrupts
}
// here we suppose that all PIN settings done in hw_setup earlier
void USB_setup(){
#if defined STM32F3
NVIC_DisableIRQ(USB_LP_IRQn);
// remap USB LP & Wakeup interrupts to 75 and 76 - works only on pure F303
RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN; // enable tacting of SYSCFG
SYSCFG->CFGR1 |= SYSCFG_CFGR1_USB_IT_RMP;
#elif defined STM32F1
NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
#elif defined STM32F0
NVIC_DisableIRQ(USB_IRQn);
RCC->APB1ENR |= RCC_APB1ENR_CRSEN;
RCC->CFGR3 &= ~RCC_CFGR3_USBSW; // reset USB
RCC->CR2 |= RCC_CR2_HSI48ON; // turn ON HSI48
uint32_t tmout = 16000000;
while(!(RCC->CR2 & RCC_CR2_HSI48RDY)){if(--tmout == 0) break;}
FLASH->ACR = FLASH_ACR_PRFTBE | FLASH_ACR_LATENCY;
CRS->CFGR &= ~CRS_CFGR_SYNCSRC;
CRS->CFGR |= CRS_CFGR_SYNCSRC_1; // USB SOF selected as sync source
CRS->CR |= CRS_CR_AUTOTRIMEN; // enable auto trim
CRS->CR |= CRS_CR_CEN; // enable freq counter & block CRS->CFGR as read-only
RCC->CFGR |= RCC_CFGR_SW;
#endif
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
//??
USB->CNTR = USB_CNTR_FRES; // Force USB Reset
for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms
USB->CNTR = 0;
USB->BTABLE = 0;
USB->DADDR = 0;
USB->ISTR = 0;
USB->CNTR = USB_CNTR_RESETM; // allow only reset interrupts
#if defined STM32F3
NVIC_EnableIRQ(USB_LP_IRQn);
#elif defined STM32F1
NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
#elif defined STM32F0
USB->BCDR |= USB_BCDR_DPPU;
NVIC_EnableIRQ(USB_IRQn);
#endif
}
#if defined STM32F3
void usb_lp_isr() __attribute__ ((alias ("USB_IRQ")));
#elif defined STM32F1
void usb_lp_can_rx0_isr() __attribute__ ((alias ("USB_IRQ")));
#elif defined STM32F0
void usb_isr() __attribute__ ((alias ("USB_IRQ")));
#endif

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/*
* Copyright 2024 Edward V. Emelianov <edward.emelianoff@gmail.com>.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include <wchar.h>
#ifndef _U_
#define _U_ __attribute__((unused))
#endif
/******************************************************************
* Hardware registers etc *
*****************************************************************/
#if defined STM32F0
#include <stm32f0.h>
#elif defined STM32F1
#include <stm32f1.h>
// there's no this define in standard header
#define USB_BASE ((uint32_t)0x40005C00)
#elif defined STM32F3
#include <stm32f3.h>
#endif
// max endpoints number
#define STM32ENDPOINTS 8
/**
* Buffers size definition
**/
// F0 - USB2_16; F1 - USB1_16; F3 - 1/2 depending on series
#if !defined USB1_16 && !defined USB2_16
#if defined STM32F0
#define USB2_16
#elif defined STM32F1
#define USB1_16
#else
#error "Can't determine USB1_16 or USB2_16, define by hands"
#endif
#endif
// BTABLE_SIZE FOR STM32F3:
// In STM32F303/302xB/C, 512 bytes SRAM is not shared with CAN.
// In STM32F302x6/x8 and STM32F30xxD/E, 726 bytes dedicated SRAM and 256 bytes shared SRAM with CAN i.e.
// 1Kbytes dedicated SRAM in case CAN is disabled.
// remember, that USB_BTABLE_SIZE will be divided by ACCESSZ, so don't divide it twice for 32-bit addressing
#ifdef NOCAN
#if defined STM32F0
#define USB_BTABLE_SIZE 1024
#elif defined STM32F3
#define USB_BTABLE_SIZE 726
//#warning "Please, check real buffer size due to docs"
#else
#error "define STM32F0 or STM32F3"
#endif
#else // !NOCAN: F0/F3 with CAN or F1 (can't simultaneously run CAN and USB)
#if defined STM32F0
#define USB_BTABLE_SIZE 768
#elif defined STM32F3
#define USB_BTABLE_SIZE 726
//#warning "Please, check real buffer size due to docs"
#else // STM32F103: 1024 bytes but with 32-bit addressing
#define USB_BTABLE_SIZE 1024
#endif
#endif // NOCAN
// first 64 bytes of USB_BTABLE are registers!
#define USB_BTABLE_BASE 0x40006000
#define USB ((USB_TypeDef *) USB_BASE)
#ifdef USB_BTABLE
#undef USB_BTABLE
#endif
#define USB_BTABLE ((USB_BtableDef *)(USB_BTABLE_BASE))
#define USB_ISTR_EPID 0x0000000F
#define USB_FNR_LSOF_0 0x00000800
#define USB_FNR_lSOF_1 0x00001000
#define USB_LPMCSR_BESL_0 0x00000010
#define USB_LPMCSR_BESL_1 0x00000020
#define USB_LPMCSR_BESL_2 0x00000040
#define USB_LPMCSR_BESL_3 0x00000080
#define USB_EPnR_CTR_RX 0x00008000
#define USB_EPnR_DTOG_RX 0x00004000
#define USB_EPnR_STAT_RX 0x00003000
#define USB_EPnR_STAT_RX_0 0x00001000
#define USB_EPnR_STAT_RX_1 0x00002000
#define USB_EPnR_SETUP 0x00000800
#define USB_EPnR_EP_TYPE 0x00000600
#define USB_EPnR_EP_TYPE_0 0x00000200
#define USB_EPnR_EP_TYPE_1 0x00000400
#define USB_EPnR_EP_KIND 0x00000100
#define USB_EPnR_CTR_TX 0x00000080
#define USB_EPnR_DTOG_TX 0x00000040
#define USB_EPnR_STAT_TX 0x00000030
#define USB_EPnR_STAT_TX_0 0x00000010
#define USB_EPnR_STAT_TX_1 0x00000020
#define USB_EPnR_EA 0x0000000F
#define USB_COUNTn_RX_BLSIZE 0x00008000
#define USB_COUNTn_NUM_BLOCK 0x00007C00
#define USB_COUNTn_RX 0x0000003F
#define USB_TypeDef USB_TypeDef_custom
typedef struct {
__IO uint32_t EPnR[STM32ENDPOINTS];
__IO uint32_t RESERVED[STM32ENDPOINTS];
__IO uint32_t CNTR;
__IO uint32_t ISTR;
__IO uint32_t FNR;
__IO uint32_t DADDR;
__IO uint32_t BTABLE;
#ifdef STM32F0
__IO uint32_t LPMCSR;
__IO uint32_t BCDR;
#endif
} USB_TypeDef;
// F303 D/E have 2x16 access scheme
typedef struct{
#if defined USB2_16
__IO uint16_t USB_ADDR_TX;
__IO uint16_t USB_COUNT_TX;
__IO uint16_t USB_ADDR_RX;
__IO uint16_t USB_COUNT_RX;
#define ACCESSZ (1)
#define BUFTYPE uint8_t
#elif defined USB1_16
__IO uint32_t USB_ADDR_TX;
__IO uint32_t USB_COUNT_TX;
__IO uint32_t USB_ADDR_RX;
__IO uint32_t USB_COUNT_RX;
#define ACCESSZ (2)
#define BUFTYPE uint16_t
#else
#error "Define USB1_16 or USB2_16"
#endif
} USB_EPDATA_TypeDef;
typedef struct{
__IO USB_EPDATA_TypeDef EP[STM32ENDPOINTS];
} USB_BtableDef;
#define EP0DATABUF_SIZE (64)
#define LASTADDR_DEFAULT (STM32ENDPOINTS * 8)
/******************************************************************
* Defines from usb.h *
*****************************************************************/
/*
* Device and/or Interface Class codes
*/
#define USB_CLASS_PER_INTERFACE 0
#define USB_CLASS_AUDIO 1
#define USB_CLASS_COMM 2
#define USB_CLASS_HID 3
#define USB_CLASS_PRINTER 7
#define USB_CLASS_PTP 6
#define USB_CLASS_MASS_STORAGE 8
#define USB_CLASS_HUB 9
#define USB_CLASS_DATA 10
#define USB_CLASS_MISC 0xef
#define USB_CLASS_VENDOR_SPEC 0xff
/*
* Descriptor types
*/
#define USB_DT_DEVICE 0x01
#define USB_DT_CONFIG 0x02
#define USB_DT_STRING 0x03
#define USB_DT_INTERFACE 0x04
#define USB_DT_ENDPOINT 0x05
#define USB_DT_QUALIFIER 0x06
#define USB_DT_IAD 0x0B
#define USB_DT_HID 0x21
#define USB_DT_REPORT 0x22
#define USB_DT_PHYSICAL 0x23
#define USB_DT_CS_INTERFACE 0x24
#define USB_DT_HUB 0x29
/*
* Descriptor sizes per descriptor type
*/
#define USB_DT_DEVICE_SIZE 18
#define USB_DT_CONFIG_SIZE 9
#define USB_DT_INTERFACE_SIZE 9
#define USB_DT_HID_SIZE 9
#define USB_DT_ENDPOINT_SIZE 7
#define USB_DT_QUALIFIER_SIZE 10
#define USB_DT_CS_INTERFACE_SIZE 5
#define USB_DT_IAD_SIZE 8
// bmRequestType & 0x80 == dev2host (1) or host2dev (0)
// recipient: bmRequestType & 0x1f
#define REQUEST_RECIPIENT(b) (b & 0x1f)
#define REQ_RECIPIENT_DEVICE 0
#define REQ_RECIPIENT_INTERFACE 1
#define REQ_RECIPIENT_ENDPOINT 2
#define REQ_RECIPIENT_OTHER 3
// type: [bmRequestType & 0x60 >> 5]
#define REQUEST_TYPE(b) ((b&0x60)>>5)
#define REQ_TYPE_STANDARD 0
#define REQ_TYPE_CLASS 1
#define REQ_TYPE_VENDOR 2
#define REQ_TYPE_RESERVED 3
//#define VENDOR_REQUEST 0x01
// standard device requests
#define GET_STATUS 0x00
#define CLEAR_FEATURE 0x01
#define SET_FEATURE 0x03
#define SET_ADDRESS 0x05
#define GET_DESCRIPTOR 0x06
#define SET_DESCRIPTOR 0x07
#define GET_CONFIGURATION 0x08
#define SET_CONFIGURATION 0x09
// and some standard interface requests
#define GET_INTERFACE 0x0A
#define SET_INTERFACE 0x0B
// and some standard endpoint requests
#define SYNC_FRAME 0x0C
// Types of descriptors
#define DEVICE_DESCRIPTOR 0x01
#define CONFIGURATION_DESCRIPTOR 0x02
#define STRING_DESCRIPTOR 0x03
#define DEVICE_QUALIFIER_DESCRIPTOR 0x06
#define DEBUG_DESCRIPTOR 0x0a
#define HID_REPORT_DESCRIPTOR 0x22
// EP types for EP_init
#define EP_TYPE_BULK 0x00
#define EP_TYPE_CONTROL 0x01
#define EP_TYPE_ISO 0x02
#define EP_TYPE_INTERRUPT 0x03
// EP types for descriptors
#define USB_BM_ATTR_CONTROL 0x00
#define USB_BM_ATTR_ISO 0x01
#define USB_BM_ATTR_BULK 0x02
#define USB_BM_ATTR_INTERRUPT 0x03
/******************************************************************
* Other stuff *
*****************************************************************/
#define RX_FLAG(epstat) (epstat & USB_EPnR_CTR_RX)
#define TX_FLAG(epstat) (epstat & USB_EPnR_CTR_TX)
#define SETUP_FLAG(epstat) (epstat & USB_EPnR_SETUP)
// EPnR bits manipulation
#define KEEP_DTOG_STAT(EPnR) (EPnR & ~(USB_EPnR_STAT_RX|USB_EPnR_STAT_TX|USB_EPnR_DTOG_RX|USB_EPnR_DTOG_TX))
#define KEEP_DTOG(EPnR) (EPnR & ~(USB_EPnR_DTOG_RX|USB_EPnR_DTOG_TX))
#define LANG_US (uint16_t)0x0409
#define _USB_STRING_(name, str) \
static const struct name \
{ \
uint8_t bLength; \
uint8_t bDescriptorType; \
uint16_t bString[(sizeof(str) - 2) / 2]; \
\
} \
name = {sizeof(name), 0x03, str}
#define _USB_LANG_ID_(name, lng_id) \
static const struct name \
{ \
uint8_t bLength; \
uint8_t bDescriptorType; \
uint16_t bString; \
\
} \
name = {0x04, 0x03, lng_id}
// EP0 configuration packet
typedef struct {
uint8_t bmRequestType;
uint8_t bRequest;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
} config_pack_t;
// endpoints state
typedef struct{
uint16_t *tx_buf; // transmission buffer address
uint16_t txbufsz; // transmission buffer size
uint8_t *rx_buf; // reception buffer address
void (*func)(); // endpoint action function
unsigned rx_cnt : 10; // received data counter
} ep_t;
extern volatile uint8_t usbON;
void USB_setup();
int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)());
void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size);
void EP_Write(uint8_t number, const uint8_t *buf, uint16_t size);
int EP_Read(uint8_t number, uint8_t *buf);
// could be [re]defined in usb_dev.c
extern void usb_class_request(config_pack_t *packet, uint8_t *data, uint16_t datalen);
extern void usb_vendor_request(config_pack_t *packet, uint8_t *data, uint16_t datalen);
extern void set_configuration();

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#define BUILD_NUMBER "13"
#define BUILD_DATE "2025-10-02"