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add BMP280/BME280

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This commit is contained in:
Edward Emelianov 2021-02-18 01:12:52 +03:00
parent 5b9e4233e6
commit c1ee273258
19 changed files with 2562 additions and 0 deletions
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F1-nolib/BMP280/BMP280.bin Executable file
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F1-nolib/BMP280/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.
*/
/*
* This file is part of the BMP280 project.
* Copyright 2021 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 "BMP280.h"
//#define EBUG
#ifdef EBUG
#include "usb.h"
#include "proto.h"
#define DBG(x) do{USB_send(x);}while(0)
#else
#define DBG(x)
#endif
#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;
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
// data for humidity calibration of BME280
static uint8_t EEE[BMP280_CALIBB_SIZE] = {0};
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_16,
.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;
}
// address: 0 or 1
void BMP280_setup(uint8_t address){
curaddress = BMP280_I2C_ADDRESS_MASK | (address & 1);
bmpstatus = BMP280_NOTINIT;
}
// setters for `params`
void BMP280_setfilter(BMP280_Filter f){
params.filter = f;
}
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;
}
/*
// read register, @return 1 if all OK
static int read_reg16(uint8_t reg, uint16_t *val){
if(I2C_OK != i2c_7bit_send_onebyte(reg, 0)) return 0;
if(I2C_OK != i2c_7bit_receive_twobytes((uint8_t*)val)) return 0;
return 1;
}*/
static int read_reg8(uint8_t reg, uint8_t *val){
if(I2C_OK != i2c_7bit_send_onebyte(reg, 0)) return 0;
if(I2C_OK != i2c_7bit_receive_onebyte(val, 1)) return 0;
return 1;
}
static int write_reg8(uint8_t reg, uint8_t val){
uint8_t d[2] = {reg, val};
if(I2C_OK != i2c_7bit_send(d, 2)) return 0;
return 1;
}
// get compensation data, return 1 if OK
static int readcompdata(){
if(I2C_OK != i2c_7bit_send_onebyte(BMP280_REG_CALIBA, 0)) return 0;
if(I2C_OK != i2c_7bit_receive((uint8_t*)&CaliData, BMP280_CALIBA_SIZE)) return 0;
CaliData.rdy = 1;
if(params.ID == BME280_CHIP_ID){
if(I2C_OK == i2c_7bit_send_onebyte(BMP280_REG_CALIBB, 0) &&
I2C_OK == i2c_7bit_receive(EEE, BMP280_CALIBB_SIZE)){
CaliData.dig_H2 = (EEE[1] << 8) | EEE[0];
CaliData.dig_H3 = EEE[2];
CaliData.dig_H4 = (EEE[3] << 4) | (EEE[4] & 0x0f);
CaliData.dig_H5 = (EEE[5] << 4) | (EEE[4] >> 4);
CaliData.dig_H6 = EEE[6];
}
}
return 1;
}
// read compensation data & write registers
int BMP280_init(){
i2c_setup();
i2c_set_addr7(curaddress);
if(!read_reg8(BMP280_REG_ID, &params.ID)) return 0;
DBG("Got device ID: "); DBG(u2str(params.ID)); DBG("\n");
if(params.ID != BMP280_CHIP_ID && params.ID != BME280_CHIP_ID){
DBG("Not BMP/BME\n");
return 0;
}
if(!write_reg8(BMP280_REG_RESET, BMP280_RESET_VALUE)){
DBG("Can't reset\n");
return 0;
}
uint8_t reg = 1;
while(reg & 1){
if(!read_reg8(BMP280_REG_STATUS, &reg)) return 0;
}
if(!readcompdata()){
DBG("Can't read calibration data\n");
}else{
DBG("T: "); DBG(u2str(CaliData.dig_T1)); DBG(" "); DBG(i2str(CaliData.dig_T2));
DBG(" "); DBG(i2str(CaliData.dig_T3));
DBG("\nP: "); DBG(u2str(CaliData.dig_P1)); DBG(" ");
DBG(i2str(CaliData.dig_P2)); DBG(" "); DBG(i2str(CaliData.dig_P3)); DBG(" ");
DBG(i2str(CaliData.dig_P4)); DBG(" "); DBG(i2str(CaliData.dig_P5)); DBG(" ");
DBG(i2str(CaliData.dig_P6)); DBG(" "); DBG(i2str(CaliData.dig_P7)); DBG(" ");
DBG(i2str(CaliData.dig_P8)); DBG(" "); DBG(i2str(CaliData.dig_P9));
DBG("\nH: "); DBG(u2str(CaliData.dig_H1)); DBG(" ");
if(params.ID == BME280_CHIP_ID){ // read H compensation
DBG(i2str(CaliData.dig_H2)); DBG(" "); DBG(u2str(CaliData.dig_H3)); DBG(" ");
DBG(i2str(CaliData.dig_H4)); DBG(" "); DBG(i2str(CaliData.dig_H5)); DBG(" ");
DBG(i2str(CaliData.dig_H6));
}else{DBG("not BME!");}
DBG("\n");
}
// write filter configuration
reg = params.filter << 2;
if(!write_reg8(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_reg8(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_reg8(BMP280_REG_CTRL_HUM, reg)){
DBG("Can't write settings for H\n");
return 0;
}
}
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) return 0;
uint8_t reg = params.regctl | BMP280_MODE_FORSED;
if(!write_reg8(BMP280_REG_CTRL, reg)){
DBG("Can't write CTRL reg\n");
return 0;
}
bmpstatus = BMP280_BUSY;
return 1;
}
void BMP280_process(){
if(bmpstatus != BMP280_BUSY) return;
// BUSY state: poll data ready
uint8_t reg;
if(!read_reg8(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);
DBG("Step1: "); DBG(i2str(v_x1_u32r)); DBG(".. ");
v_x1_u32r = v_x1_u32r
- (((((v_x1_u32r >> 15) * (v_x1_u32r >> 15)) >> 7)
* ((int32_t)CaliData.dig_H1)) >> 4);
DBG("Step2: "); DBG(i2str(v_x1_u32r)); DBG(".. ");
v_x1_u32r = v_x1_u32r < 0 ? 0 : v_x1_u32r;
v_x1_u32r = v_x1_u32r > 419430400 ? 419430400 : v_x1_u32r;
DBG("Step3: "); DBG(i2str(v_x1_u32r)); DBG("\n");
return v_x1_u32r >> 12;
}
// read data & convert it
int BMP280_getdata(int32_t *T, uint32_t *P, uint32_t *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){
DBG("Not BME!\n");
if(H) *H = 0;
H = NULL;
datasz = 6;
}
uint8_t data[8];
if(I2C_OK != i2c_7bit_send_onebyte(BMP280_REG_ALLDATA, 0)) return 0;
if(I2C_OK != i2c_7bit_receive(data, datasz)) return 0;
int32_t p = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4);
DBG("puncomp = "); DBG(i2str(p)); DBG("\n");
int32_t t = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4);
DBG("tuncomp = "); DBG(i2str(t)); DBG("\n");
int32_t t_fine;
int32_t Temp = compTemp(t, &t_fine);
DBG("tfine = "); DBG(i2str(t_fine)); DBG("\n");
if(T) *T = Temp;
if(P){
float fp = compPres(p, t_fine) / 256.;
*P = fp;// * 100.;
}
if(H){
int32_t h = (data[6] << 8) | data[7];
DBG("huncomp = "); DBG(i2str(h)); DBG("\n");
float fh = compHum(h, t_fine)/1024.;
*H = fh * 100.;
}
return 1;
}
#if 0
/*
* start themperature reading @return 0 if all OK
*/
int BMP280_cmdT(){
const uint8_t cmd[2] = {0x03, 0x11};
if(state != RELAX){
return 1;
}
bmpstatus = BMP280_BUSY;
i2c_status st = i2c_7bit_send(cmd, 2);
if(st != I2C_OK){
bmpstatus = BMP280_ERR;
return 1;
}
DBG("Wait for T\n");
state = WAITFORT;
return 0;
}
/*
* start humidity reading @return 0 if all OK
*/
int BMP280_cmdH(){
const uint8_t cmd[2] = {0x03, 0x01};
if(state != RELAX){
return 1;
}
bmpstatus = BMP280_BUSY;
i2c_status st = i2c_7bit_send(cmd, 2);
if(st != I2C_OK){
bmpstatus = BMP280_ERR;
return 1;
}
state = WAITFORH;
DBG("Wait for H\n");
return 0;
}
int32_t BMP280_getT(){ // T*10
if(bmpstatus != BMP280_TRDY) return -5000;
DBG("TH="); DBG(u2str(TH)); DBG("\n");
TH >>= 2;
uint32_t d = (TH*10)/32 - 500;
bmpstatus = BMP280_RELAX;
return d;
}
uint32_t BMP280_getH(){ // hum * 10
if(bmpstatus != BMP280_HRDY) return 5000;
TH >>= 4;
uint32_t d = (TH*10)/16 - 240;
bmpstatus = BMP280_RELAX;
return d;
}
/*
* process state machine
*/
void BMP280_process(){
uint8_t b, d[2];
i2c_status st;
if(state == RELAX) return;
if(state == WAITFORH || state == WAITFORT){ // poll RDY
DBG("Poll\n");
if((st = i2c_7bit_send_onebyte(0, 0)) == I2C_OK){
DBG("0 sent\n");
if(i2c_7bit_receive_onebyte(&b, 1) == I2C_OK){
DBG("received: "); DBG(u2str(b)); DBG("\n");
if(b) return; // !RDY
if((st = i2c_7bit_send_onebyte(1, 0)) == I2C_OK){
DBG("sent 1\n");
if((st = i2c_7bit_receive_twobytes(d)) == I2C_OK){
DBG("got data: ");
DBG(u2str(d[0])); DBG(" "); DBG(u2str(d[1])); DBG("\n");
bmpstatus = (state == WAITFORH) ? BMP280_HRDY : BMP280_TRDY;
TH = (d[0]<<8) | d[1];
}
}
state = RELAX;
if(st != I2C_OK){
bmpstatus = BMP280_ERR;
}
}
}else{
state = RELAX;
bmpstatus = BMP280_ERR;
}
}
}
#endif

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F1-nolib/BMP280/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.
*/
/*
* This file is part of the BMP280 project.
* Copyright 2021 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 <stm32f1.h>
#define BMP280_CHIP_ID 0x58
#define BME280_CHIP_ID 0x60
typedef enum{ // Nsamples for filtering
BMP280_FILTER_OFF = 0,
BMP280_FILTER_2 = 1,
BMP280_FILTER_4 = 2,
BMP280_FILTER_8 = 3,
BMP280_FILTER_16 = 4,
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);
int BMP280_init();
void BMP280_setfilter(BMP280_Filter f);
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(int32_t *T, uint32_t *P, uint32_t *H);
#endif // BMP280_H__

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BINARY = BMP280
BOOTPORT ?= /dev/ttyUSB0
BOOTSPEED ?= 115200
# MCU FAMILY
FAMILY ?= F1
# MCU code
MCU ?= F103x8
# density (stm32f10x.h, lines 70-84)
DENSITY ?= MD
# change this linking script depending on particular MCU model,
LDSCRIPT ?= stm32f103x8.ld
# debug
#DEFS = -DEBUG
INDEPENDENT_HEADERS=
FP_FLAGS ?= -msoft-float -mfloat-abi=soft
ASM_FLAGS ?= -mthumb -mcpu=cortex-m3 -mfix-cortex-m3-ldrd
ARCH_FLAGS = $(ASM_FLAGS) $(FP_FLAGS)
###############################################################################
# Executables
#PREFIX ?= arm-none-eabi
# gcc from arm web site
PREFIX ?= /opt/bin/arm-none-eabi
TOOLCHLIB ?= /opt/arm-none-eabi/lib
RM := rm -f
RMDIR := rmdir
CC := $(PREFIX)-gcc
# don't replace ld with gcc: the binary size would be much greater!!
LD := $(PREFIX)-ld
AR := $(PREFIX)-ar
AS := $(PREFIX)-as
SIZE := $(PREFIX)-size
OBJCOPY := $(PREFIX)-objcopy
OBJDUMP := $(PREFIX)-objdump
GDB := $(PREFIX)-gdb
STFLASH := $(shell which st-flash)
STBOOT := $(shell which stm32flash)
DFUUTIL := $(shell which dfu-util)
###############################################################################
# Source files
OBJDIR = mk
SRC := $(wildcard *.c)
OBJS := $(addprefix $(OBJDIR)/, $(SRC:%.c=%.o))
STARTUP = $(OBJDIR)/startup.o
OBJS += $(STARTUP)
# dependencies: we need them to recompile files if their headers-dependencies changed
DEPS := $(OBJS:.o=.d)
INC_DIR ?= ../inc
INCLUDE := -I$(INC_DIR)/Fx -I$(INC_DIR)/cm
LIB_DIR := $(INC_DIR)/ld
###############################################################################
# C flags
CFLAGS += -O2 -g -D__thumb2__=1 -MD
CFLAGS += -Wall -Werror -Wextra -Wshadow
CFLAGS += -fno-common -ffunction-sections -fdata-sections -fno-stack-protector
CFLAGS += $(ARCH_FLAGS)
###############################################################################
# Linker flags
LDFLAGS += -nostartfiles --static -nostdlibs
LDFLAGS += -L$(LIB_DIR) -L$(TOOLCHLIB)
LDFLAGS += -T$(LDSCRIPT)
###############################################################################
# Used libraries
LDLIBS += -lc $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
DEFS += -DSTM32$(FAMILY) -DSTM32$(MCU) -DSTM32F10X_$(DENSITY)
ELF := $(OBJDIR)/$(BINARY).elf
LIST := $(OBJDIR)/$(BINARY).list
BIN := $(BINARY).bin
HEX := $(BINARY).hex
all: bin list size
elf: $(ELF)
bin: $(BIN)
hex: $(HEX)
list: $(LIST)
ifneq ($(MAKECMDGOALS),clean)
-include $(DEPS)
endif
$(OBJDIR):
mkdir $(OBJDIR)
$(STARTUP): $(INC_DIR)/startup/vector.c
$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -o $@ -c $<
$(OBJDIR)/%.o: %.c
@echo " CC $<"
$(CC) $(CFLAGS) $(DEFS) $(INCLUDE) -o $@ -c $<
$(BIN): $(ELF)
@echo " OBJCOPY $(BIN)"
$(OBJCOPY) -Obinary $(ELF) $(BIN)
$(HEX): $(ELF)
@echo " OBJCOPY $(HEX)"
$(OBJCOPY) -Oihex $(ELF) $(HEX)
$(LIST): $(ELF)
@echo " OBJDUMP $(LIST)"
$(OBJDUMP) -S $(ELF) > $(LIST)
$(ELF): $(OBJDIR) $(OBJS)
@echo " LD $(ELF)"
$(LD) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
size: $(ELF)
$(SIZE) $(ELF)
clean:
@echo " CLEAN"
$(RM) $(OBJS) $(DEPS) $(ELF) $(HEX) $(LIST)
@rmdir $(OBJDIR) 2>/dev/null || true
flash: $(BIN)
@echo " FLASH $(BIN)"
$(STFLASH) write $(BIN) 0x8000000
boot: $(BIN)
@echo " LOAD $(BIN) through bootloader"
$(STBOOT) -b$(BOOTSPEED) $(BOOTPORT) -w $(BIN)
dfuboot: $(BIN)
@echo " LOAD $(BIN) THROUGH DFU"
$(DFUUTIL) -a0 -D $(BIN) -s 0x08000000
.PHONY: clean flash boot

1
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Work with I2C humidity/temperature sensors SI7005 & HTU21D

74
F1-nolib/BMP280/dewpoint.c Normal file
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/*
* This file is part of the BMP280 project.
* Copyright 2021 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 "dewpoint.h"
#include "usb.h"
#include "proto.h"
#define NKNOTS (32)
const uint16_t X[NKNOTS] = {1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 19, 22, 29, 37, 47, 59, 72, 87, 104,
123, 145, 171, 200, 232, 267, 348, 443, 555, 684, 832};
const float Y[NKNOTS] = {-6.90776, -6.21461, -5.80914, -5.52146, -5.29832, -5.116, -4.96185, -4.82831,
-4.60517, -4.42285, -4.2687, -4.13517, -3.96332, -3.81671, -3.54046, -3.29684,
-3.05761, -2.83022, -2.63109, -2.44185, -2.26336, -2.09557, -1.93102, -1.76609,
-1.60944, -1.46102, -1.32051, -1.05555, -0.814186, -0.588787, -0.379797, -0.183923};
const float K[NKNOTS] = {0.693147, 0.405465, 0.287682, 0.223144, 0.182322, 0.154151, 0.133531, 0.111572,
0.0911608, 0.0770753, 0.0667657, 0.0572834, 0.0488678, 0.0394648, 0.0304528,
0.023923, 0.0189492, 0.0153176, 0.0126161, 0.010499, 0.00883123, 0.00747952,
0.00634345, 0.00540186, 0.00463813, 0.00401461, 0.00327103, 0.00254071,
0.00201249, 0.00162008, 0.00132348, 0.00109478};
float ln(uint16_t RH){
// find interval
int idx = (NKNOTS)/2, left = 0, right = NKNOTS-1; // left, right, middle
while(idx > left && idx < right){
uint16_t midval = X[idx];
if(RH < midval){
if(idx == 0) break;
if(RH > X[idx-1]){ // found
--idx;
break;
}
right = idx - 1;
idx = (left + right)/2;
}else{
if(RH < X[idx+1]) break; // found
left = idx + 1;
idx = (left + right)/2;
}
}
if(idx < 0) idx = 0;
else if(idx > NKNOTS-1) idx = NKNOTS - 1;
//USB_send("idx="); USB_send(u2str(idx)); USB_send("\n");
float l = Y[idx] + K[idx]*(RH - X[idx]);
#undef NKNOTS
return l;
}
/**
* @brief dewpoint calculate dew point (*10degrC)
* @param T - temperature (*10degrC)
* @param H - rel. humidity (*10%)
* @return dewpoint
*/
int32_t dewpoint(int32_t T, uint32_t H){
float gamma = 17.27 * T / (2377 + T);
gamma += ln(H);
float d = 2377 * gamma / (17.27 - gamma);
return (int32_t)d;
}

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/*
* This file is part of the BMP280 project.
* Copyright 2021 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 <stm32f1.h>
float ln(uint16_t RH);
int32_t dewpoint(int32_t T, uint32_t H);

48
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/*
* This file is part of the BMP280 project.
* Copyright 2020 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(){
// Enable clocks to the GPIO subsystems (PB for ADC), turn on AFIO clocking to disable SWD/JTAG
RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
// turn off SWJ/JTAG
// AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
AFIO->MAPR = AFIO_MAPR_SWJ_CFG_JTAGDISABLE; // for PA15
// Set led as opendrain output
GPIOC->CRH |= CRH(13, CNF_ODOUTPUT|MODE_SLOW);
// USB pullup (PA15) - pushpull output
GPIOA->CRH = CRH(15, CNF_PPOUTPUT|MODE_SLOW);
}
void hw_setup(){
gpio_setup();
}
void iwdg_setup(){
uint32_t tmout = 16000000;
RCC->CSR |= RCC_CSR_LSION;
while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
IWDG->KR = IWDG_START;
IWDG->KR = IWDG_WRITE_ACCESS;
IWDG->PR = IWDG_PR_PR_1;
IWDG->RLR = 1250;
tmout = 16000000;
while(IWDG->SR){if(--tmout == 0) break;}
IWDG->KR = IWDG_REFRESH;
}

43
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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 __HARDWARE_H__
#define __HARDWARE_H__
#include "stm32f1.h"
// LED0 - PC13 (bluepill), blinking each second
#define LED0_port GPIOC
#define LED0_pin (1<<13)
// USB pullup (not present in bluepill, should be soldered) - PA15
#define USBPU_port GPIOA
#define USBPU_pin (1<<15)
#define USBPU_ON() pin_set(USBPU_port, USBPU_pin)
#define USBPU_OFF() pin_clear(USBPU_port, USBPU_pin)
#define LED_blink(x) pin_toggle(x ## _port, x ## _pin)
#define LED_on(x) pin_clear(x ## _port, x ## _pin)
#define LED_off(x) pin_set(x ## _port, x ## _pin)
void hw_setup();
void iwdg_setup();
#endif // __HARDWARE_H__

236
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/*
* This file is part of the BMP280 project.
* Copyright 2021 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"
#ifdef EBUG
#include "usb.h"
#include "proto.h"
#define DBG(x) do{USB_send(x);}while(0)
#else
#define DBG(x)
#endif
extern volatile uint32_t Tms;
// current addresses for read/write (should be set with i2c_set_addr7)
static uint8_t addr7r = 0, addr7w = 0;
/*
* PB10/PB6 - I2C_SCL, PB11/PB7 - I2C_SDA or remap @ PB8 & PB9
*/
void i2c_setup(){
I2C1->CR1 = 0;
I2C1->SR1 = 0;
RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;
GPIOB->CRL = (GPIOB->CRL & ~(GPIO_CRL_CNF6 | GPIO_CRL_CNF7)) |
CRL(6, CNF_AFOD | MODE_NORMAL) | CRL(7, CNF_AFOD | MODE_NORMAL);
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN;
I2C1->CR2 = 8; // FREQR=8MHz, T=125ns
I2C1->TRISE = 9; // (9-1)*125 = 1mks
I2C1->CCR = 40; // normal mode, 8MHz/2/40 = 100kHz
I2C1->CR1 |= I2C_CR1_PE; // enable periph
}
void i2c_set_addr7(uint8_t addr){
addr7w = addr << 1;
addr7r = addr7w | 1;
}
// wait for event evt no more than 2 ms
#define I2C_WAIT(evt) do{ register uint32_t wait4 = Tms + 2; \
while(Tms < wait4 && !(evt)) IWDG->KR = IWDG_REFRESH; \
if(!(evt)){ret = I2C_TMOUT; goto eotr;}}while(0)
// wait for !busy
#define I2C_LINEWAIT() do{ register uint32_t wait4 = Tms + 2; \
while(Tms < wait4 && (I2C1->SR2 & I2C_SR2_BUSY)) IWDG->KR = IWDG_REFRESH; \
if(I2C1->SR2 & I2C_SR2_BUSY){I2C1->CR1 |= I2C_CR1_SWRST; return I2C_LINEBUSY;}\
}while(0)
// start writing
static i2c_status i2c_7bit_startw(){
i2c_status ret = I2C_LINEBUSY;
DBG("SR1="); DBG(u2str(I2C1->SR1)); DBG("\n");
DBG("CR1="); DBG(u2str(I2C1->CR1)); DBG("\n");
DBG("CR2="); DBG(u2str(I2C1->CR2)); DBG("\n");
if(I2C1->CR1 != I2C_CR1_PE) i2c_setup();
if(I2C1->SR1) I2C1->SR1 = 0; // clear NACK and other problems
(void) I2C1->SR2;
I2C_LINEWAIT();
DBG("linew\n");
I2C1->CR1 |= I2C_CR1_START; // generate start sequence
I2C_WAIT(I2C1->SR1 & I2C_SR1_SB); // wait for SB
DBG("SB\n");
(void) I2C1->SR1; // clear SB
I2C1->DR = addr7w; // set address
I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR); // wait for ADDR flag (timeout @ NACK)
DBG("ADDR\n");
if(I2C1->SR1 & I2C_SR1_AF){ // NACK
return I2C_NACK;
}
DBG("ACK\n");
(void) I2C1->SR2; // clear ADDR
ret = I2C_OK;
eotr:
return ret;
}
/**
* send one byte in 7bit address mode
* @param data - data to write
* @param stop - ==1 to send stop event
* @return status
*/
i2c_status i2c_7bit_send_onebyte(uint8_t data, uint8_t stop){
i2c_status ret = i2c_7bit_startw();
if(ret != I2C_OK){
I2C1->CR1 |= I2C_CR1_STOP;
goto eotr;
}
I2C1->DR = data; // init data send register
DBG("TxE\n");
I2C_WAIT(I2C1->SR1 & I2C_SR1_TXE); // wait for TxE (timeout when NACK)
ret = I2C_OK;
DBG("OK\n");
if(stop){
I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF); // wait for BTF
DBG("BTF\n");
}
eotr:
if(stop){
I2C1->CR1 |= I2C_CR1_STOP; // generate stop event
}
return ret;
}
// send data array
i2c_status i2c_7bit_send(const uint8_t *data, int datalen){
i2c_status ret = i2c_7bit_startw();
if(ret != I2C_OK){
I2C1->CR1 |= I2C_CR1_STOP;
goto eotr;
}
for(int i = 0; i < datalen; ++i){
I2C1->DR = data[i];
I2C_WAIT(I2C1->SR1 & I2C_SR1_TXE);
}
ret = I2C_OK;
I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF);
eotr:
I2C1->CR1 |= I2C_CR1_STOP;
return ret;
}
i2c_status i2c_7bit_receive_onebyte(uint8_t *data, uint8_t stop){
i2c_status ret = I2C_LINEBUSY;
//I2C_LINEWAIT();
I2C1->CR1 |= I2C_CR1_START; // generate start sequence
I2C_WAIT(I2C1->SR1 & I2C_SR1_SB); // wait for SB
DBG("Rx SB\n");
(void) I2C1->SR1; // clear SB
I2C1->DR = addr7r; // set address
DBG("Rx addr\n");
I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR); // wait for ADDR flag
DBG("Rx ack\n");
I2C1->CR1 &= ~I2C_CR1_ACK; // clear ACK
if(I2C1->SR1 & I2C_SR1_AF){ // NACK
DBG("Rx nak\n");
ret = I2C_NACK;
goto eotr;
}
(void) I2C1->SR2; // clear ADDR
DBG("Rx stop\n");
if(stop) I2C1->CR1 |= I2C_CR1_STOP; // program STOP
I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE); // wait for RxNE
DBG("Rx OK\n");
*data = I2C1->DR; // read data & clear RxNE
ret = I2C_OK;
eotr:
return ret;
}
i2c_status i2c_7bit_receive_twobytes(uint8_t *data){
i2c_status ret = I2C_LINEBUSY;
//I2C_LINEWAIT();
I2C1->CR1 |= I2C_CR1_START | I2C_CR1_POS | I2C_CR1_ACK; // generate start sequence, set pos & ack
I2C_WAIT(I2C1->SR1 & I2C_SR1_SB); // wait for SB
DBG("2 Rx sb\n");
(void) I2C1->SR1; // clear SB
I2C1->DR = addr7r; // set address
I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR); // wait for ADDR flag
DBG("2 ADDR\n");
if(I2C1->SR1 & I2C_SR1_AF){ // NACK
ret = I2C_NACK;
goto eotr;
}
DBG("2 ACK\n");
(void) I2C1->SR2; // clear ADDR
I2C1->CR1 &= ~I2C_CR1_ACK; // clear ACK
I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF); // wait for BTF
DBG("2 BTF\n");
I2C1->CR1 |= I2C_CR1_STOP; // program STOP
*data++ = I2C1->DR; *data = I2C1->DR; // read data & clear RxNE
ret = I2C_OK;
eotr:
return ret;
}
// receive any amount of bytes
i2c_status i2c_7bit_receive(uint8_t *data, uint16_t nbytes){
if(nbytes == 0) return I2C_HWPROBLEM;
I2C1->SR1 = 0; // clear previous NACK flag & other error flags
if(nbytes == 1) return i2c_7bit_receive_onebyte(data, 1);
else if(nbytes == 2) return i2c_7bit_receive_twobytes(data);
i2c_status ret = I2C_LINEBUSY;
//I2C_LINEWAIT();
I2C1->CR1 |= I2C_CR1_START | I2C_CR1_ACK; // generate start sequence, set pos & ack
I2C_WAIT(I2C1->SR1 & I2C_SR1_SB); // wait for SB
DBG("got SB\n");
(void) I2C1->SR1; // clear SB
I2C1->DR = addr7r; // set address
I2C_WAIT(I2C1->SR1 & I2C_SR1_ADDR); // wait for ADDR flag
DBG("send addr\n");
if(I2C1->SR1 & I2C_SR1_AF){ // NACK
DBG("NACKed\n");
ret = I2C_NACK;
goto eotr;
}
DBG("ACKed\n");
(void) I2C1->SR2; // clear ADDR
for(uint16_t x = nbytes - 3; x > 0; --x){
I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE); // wait next byte
*data++ = I2C1->DR; // get data
}
DBG("three left\n");
// three bytes remain to be read
I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE); // wait dataN-2
DBG("dataN-2\n");
I2C_WAIT(I2C1->SR1 & I2C_SR1_BTF); // wait for BTF
DBG("BTF\n");
I2C1->CR1 &= ~I2C_CR1_ACK; // clear ACK
*data++ = I2C1->DR; // read dataN-2
I2C1->CR1 |= I2C_CR1_STOP; // program STOP
*data++ = I2C1->DR; // read dataN-1
I2C_WAIT(I2C1->SR1 & I2C_SR1_RXNE); // wait next byte
*data = I2C1->DR; // read dataN
DBG("got it\n");
ret = I2C_OK;
eotr:
return ret;
}

41
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/*
* This file is part of the BMP280 project.
* Copyright 2021 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 I2C_H__
#include <stm32f1.h>
typedef enum{
I2C_OK = 0,
I2C_LINEBUSY,
I2C_TMOUT,
I2C_NOADDR,
I2C_NACK,
I2C_HWPROBLEM,
} i2c_status;
void i2c_setup();
void i2c_set_addr7(uint8_t addr);
i2c_status i2c_7bit_send_onebyte(uint8_t data, uint8_t stop);
i2c_status i2c_7bit_send(const uint8_t *data, int datalen);
i2c_status i2c_7bit_receive_onebyte(uint8_t *data, uint8_t stop);
i2c_status i2c_7bit_receive_twobytes(uint8_t *data);
i2c_status i2c_7bit_receive(uint8_t *data, uint16_t nbytes);
#define I2C_H__
#endif // I2C_H__

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 "BMP280.h"
#include "dewpoint.h"
#include "hardware.h"
#include "proto.h"
#include "usb.h"
#include "usb_lib.h"
#define USBBUFSZ 127
volatile uint32_t Tms = 0;
/* Called when systick fires */
void sys_tick_handler(void){
++Tms;
}
// usb getline
static char *get_USB(){
static char tmpbuf[USBBUFSZ+1], *curptr = tmpbuf;
static int rest = USBBUFSZ;
int x = USB_receive(curptr);
curptr[x] = 0;
if(!x) return NULL;
if(curptr[x-1] == '\n'){
curptr = tmpbuf;
rest = USBBUFSZ;
return tmpbuf;
}
curptr += x; rest -= x;
if(rest <= 0){ // buffer overflow
curptr = tmpbuf;
rest = USBBUFSZ;
USB_send("USB buffer overflow\n");
}
return NULL;
}
static void showd(int32_t mT, int32_t mH){
USB_send("Dewpoint=");
USB_send(u2str(dewpoint(mT, mH)));
USB_send("*10degrC\n");
}
int main(void){
uint32_t lastT = 0;
sysreset();
StartHSE();
hw_setup();
SysTick_Config(72000);
RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
USBPU_OFF();
USB_setup();
iwdg_setup();
USBPU_ON();
while (1){
IWDG->KR = IWDG_REFRESH; // refresh watchdog
if(lastT > Tms || Tms - lastT > 499){
LED_blink(LED0);
lastT = Tms;
}
usb_proc();
BMP280_process();
BMP280_status s = BMP280_get_status();
if(s == BMP280_RDY){ // data ready - get it
int32_t T;
uint32_t P, H;
if(BMP280_getdata(&T, &P, &H)){
USB_send("T="); USB_send(i2str(T)); USB_send(" (*100degC)\nP=");
USB_send(u2str(P)); USB_send(" (Pa) or ");
float mm = P*0.0750062;
USB_send(u2str(mm)); USB_send(" (*10mmHg)\n");
if(H){
USB_send("H="); USB_send(u2str(H)); USB_send(" (*100%)\n");
showd(T/10, H/10);
}
}else USB_send("Can't read data\n");
}else if(s == BMP280_ERR){
USB_send("Error in measurement\n");
BMP280_init();
}
char *txt, *ans;
if((txt = get_USB())){
IWDG->KR = IWDG_REFRESH;
ans = (char*)parse_cmd(txt);
if(ans){
uint16_t l = 0; char *p = ans;
while(*p++) l++;
USB_send(ans);
}
}
}
return 0;
}

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 "BMP280.h"
#include "dewpoint.h"
#include "proto.h"
#include "usb.h"
extern volatile uint32_t Tms;
char *omit_spaces(const char *buf){
while(*buf){
if(*buf > ' ') break;
++buf;
}
return (char*)buf;
}
// In case of overflow return `buf` and N==0xffffffff
// read decimal number & return pointer to next non-number symbol
static 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 (char*)buf;
}
// read hexadecimal number (without 0x prefix!)
static char *gethex(const char *buf, uint32_t *N){
char *start = (char*)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 (char*)buf;
}
// read octal number (without 0 prefix!)
static char *getoct(const char *buf, uint32_t *N){
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 (char*)buf;
}
// read binary number (without b prefix!)
static char *getbin(const char *buf, uint32_t *N){
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 (char*)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)
*/
char *getnum(const char *txt, uint32_t *N){
char *nxt = NULL;
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;
}
const char* helpmsg =
"'0/1' - reset I2C with devADDR 0/1\n"
"'Fx'- set filter to x (0..4)\n"
"'I' - read chip ID (after init)\n"
"'M' - start measurements\n"
"'N' - read number (0..1000) and show its ln\n"
"'Ovx' - set oversampling of v(t,h or p) to x(0..5)\n"
"'R' - software reset\n"
"'W' - test watchdog\n"
;
const char *parse_cmd(const char *buf){
uint8_t u;
if(buf[1] == '\n'){ // one symbol commands
if(*buf == '0' || *buf == '1'){
BMP280_setup(*buf - '0');
if(!BMP280_init()) return "Error in init process\n";
return "OK, inited\n";
}
switch(*buf){
case 'I':
if(BMP280_read_ID(&u)){
if(u == BMP280_CHIP_ID) return "BMP280\n";
else return "BME280\n";
}else return "Failed\n";
break;
case 'M':
if(!BMP280_start()) return "BMP280 not found or not inited\n";
else return "Start\n";
break;
case 'R':
USB_send("Soft reset\n");
NVIC_SystemReset();
break;
case 'W':
USB_send("Wait for reboot\n");
while(1){nop();};
break;
default:
return helpmsg;
}
return NULL;
}
uint32_t Num = 0;
int32_t I;
char *nxt, *bufori = (char*)buf;
void (*osfunc)(BMP280_Oversampling);
switch(*buf){ // long messages
case 'F':
++buf;
if(buf != getnum(buf, &Num) && Num < BMP280_FILTERMAX){
BMP280_setfilter((BMP280_Filter)Num);
return "Changed\n";
}else return "Wrong filter number";
break;
case 'N':
++buf;
nxt = getnum(buf, &Num);
if(buf == nxt){
if(Num == 0) return "Wrong number\n";
return "Integer32 overflow\n";
}
USB_send("ln("); USB_send(u2str(Num)); USB_send(")=");
I = ln(Num);
USB_send(i2str(I));
if(*nxt && *nxt != '\n'){
USB_send(", the rest of string: ");
USB_send(nxt);
}else USB_send("\n");
break;
case 'O':
++buf;
osfunc = NULL;
switch(*buf){
case 'h': // h_os
osfunc = BMP280_setOSh;
break;
case 'p': // p_os
osfunc = BMP280_setOSp;
break;
case 't': // t_os
osfunc = BMP280_setOSt;
break;
default:
return bufori;
}
++buf;
if(osfunc && buf != getnum(buf, &Num) && Num < BMP280_OVERSMAX){
osfunc((BMP280_Oversampling)Num);
return "Changed\n";
}else return "Wrong OS number";
break;
default:
return bufori;
}
return NULL;
}
static 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){
*(--bufptr) = val % 10 + '0';
val /= 10;
}
}
if(minus) *(--bufptr) = '-';
return bufptr;
}
// return string with number `val`
char *u2str(uint32_t val){
return _2str(val, 0);
}
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);
}

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 PROTO_H__
#define PROTO_H__
#include <stm32f1.h>
const char *parse_cmd(const char *buf);
char *omit_spaces(const char *buf);
char *getnum(const char *buf, uint32_t *N);
char *u2str(uint32_t val);
char *i2str(int32_t val);
#endif // PROTO_H__

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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.h"
#include "usb_lib.h"
static volatile uint8_t tx_succesfull = 1;
static volatile uint8_t rxNE = 0;
static int sstrlen(const char *s){
if(!s) return 0;
int l = 0;
while(*s++) ++l;
return l;
}
// interrupt IN handler (never used?)
static void EP1_Handler(){
uint16_t epstatus = KEEP_DTOG(USB->EPnR[1]);
if(RX_FLAG(epstatus)) epstatus = (epstatus & ~USB_EPnR_STAT_TX) ^ USB_EPnR_STAT_RX; // set valid RX
else epstatus = epstatus & ~(USB_EPnR_STAT_TX|USB_EPnR_STAT_RX);
// clear CTR
epstatus = (epstatus & ~(USB_EPnR_CTR_RX|USB_EPnR_CTR_TX));
USB->EPnR[1] = epstatus;
}
// data IN/OUT handlers
static void transmit_Handler(){ // EP3IN
tx_succesfull = 1;
uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
// clear CTR keep DTOGs & STATs
USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
}
static void receive_Handler(){ // EP2OUT
rxNE = 1;
uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[2]);
USB->EPnR[2] = (epstatus & ~(USB_EPnR_CTR_RX)); // clear RX ctr
}
void USB_setup(){
NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
RCC->APB1ENR |= RCC_APB1ENR_USBEN;
USB->CNTR = USB_CNTR_FRES; // Force USB Reset
for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms
//uint32_t ctr = 0;
USB->CNTR = 0;
USB->BTABLE = 0;
USB->DADDR = 0;
USB->ISTR = 0;
USB->CNTR = USB_CNTR_RESETM | USB_CNTR_WKUPM; // allow only wakeup & reset interrupts
NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
}
static int usbwr(const char *buf, int l){
uint32_t ctra = 1000000;
while(--ctra && tx_succesfull == 0){
IWDG->KR = IWDG_REFRESH;
}
tx_succesfull = 0;
EP_Write(3, (uint8_t*)buf, l);
ctra = 1000000;
while(--ctra && tx_succesfull == 0){
IWDG->KR = IWDG_REFRESH;
}
if(tx_succesfull == 0){usbON = 0; return 1;} // usb is OFF?
return 0;
}
static char usbbuff[USB_TXBUFSZ-1]; // temporary buffer (63 - to prevent need of ZLP)
static int buflen = 0; // amount of symbols in usbbuff
// send next up to 63 bytes of data in usbbuff
static void send_next(){
if(!buflen || !tx_succesfull) return;
tx_succesfull = 0;
EP_Write(3, (uint8_t*)usbbuff, buflen);
buflen = 0;
}
// unblocking sending - just fill a buffer
void USB_send(const char *buf){
int len = sstrlen(buf);
if(!usbON || !len) return;
if(len > USB_TXBUFSZ-1 - buflen){
usbwr(usbbuff, buflen);
buflen = 0;
}
if(len > USB_TXBUFSZ-1){
USB_send_blk(buf, len);
return;
}
while(len--) usbbuff[buflen++] = *buf++;
}
// blocking sending
void USB_send_blk(const char *buf, int len){
if(!usbON || !len) return; // USB disconnected
if(buflen){
usbwr(usbbuff, buflen);
buflen = 0;
}
int needzlp = 0;
while(len){
if(len == USB_TXBUFSZ) needzlp = 1;
int s = (len > USB_TXBUFSZ) ? USB_TXBUFSZ : len;
if(usbwr(buf, s)) return;
len -= s;
buf += s;
}
if(needzlp){
usbwr(NULL, 0);
}
}
void usb_proc(){
switch(USB_Dev.USB_Status){
case USB_STATE_CONFIGURED:
// make new BULK endpoint
// Buffer have 1024 bytes, but last 256 we use for CAN bus (30.2 of RM: USB main features)
EP_Init(1, EP_TYPE_INTERRUPT, USB_EP1BUFSZ, 0, EP1_Handler); // IN1 - transmit
EP_Init(2, EP_TYPE_BULK, 0, USB_RXBUFSZ, receive_Handler); // OUT2 - receive data
EP_Init(3, EP_TYPE_BULK, USB_TXBUFSZ, 0, transmit_Handler); // IN3 - transmit data
USB_Dev.USB_Status = USB_STATE_CONNECTED;
break;
case USB_STATE_DEFAULT:
case USB_STATE_ADDRESSED:
if(usbON){
usbON = 0;
}
break;
default: // USB_STATE_CONNECTED - send next data portion
if(!usbON) return;
send_next();
}
}
/**
* @brief USB_receive
* @param buf (i) - buffer[64] for received data
* @return amount of received bytes
*/
int USB_receive(char *buf){
if(!usbON || !rxNE) return 0;
int sz = EP_Read(2, (uint16_t*)buf);
uint16_t epstatus = KEEP_DTOG(USB->EPnR[2]);
// keep stat_tx & set ACK rx
USB->EPnR[2] = (epstatus & ~(USB_EPnR_STAT_TX)) ^ USB_EPnR_STAT_RX;
rxNE = 0;
return sz;
}

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 __USB_H__
#define __USB_H__
#include "hardware.h"
#define BUFFSIZE (64)
void USB_setup();
void usb_proc();
void USB_send(const char *buf);
void USB_send_blk(const char *buf, int len);
int USB_receive(char *buf);
#endif // __USB_H__

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 __USB_DEFS_H__
#define __USB_DEFS_H__
#include <stm32f1.h>
// max endpoints number
#define STM32ENDPOINTS 8
/**
* Buffers size definition
**/
#define USB_BTABLE_SIZE 512
// first 64 bytes of USB_BTABLE are registers!
//#define USB_EP0_BASEADDR 64
// for USB FS EP0 buffers are from 8 to 64 bytes long (64 for PL2303)
#define USB_EP0_BUFSZ 64
// USB transmit buffer size (64 for PL2303)
#define USB_TXBUFSZ 64
// USB receive buffer size (64 for PL2303)
#define USB_RXBUFSZ 64
// EP1 - interrupt - buffer size
#define USB_EP1BUFSZ 8
#define USB_BTABLE_BASE 0x40006000
#define USB_BASE ((uint32_t)0x40005C00)
#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
#ifdef USB_TypeDef
#define USB_TypeDef USB_TypeDef_custom
#endif
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;
} USB_TypeDef;
typedef struct{
__IO uint32_t USB_ADDR_TX;
__IO uint32_t USB_COUNT_TX;
__IO uint32_t USB_ADDR_RX;
__IO uint32_t USB_COUNT_RX;
} USB_EPDATA_TypeDef;
typedef struct{
__IO USB_EPDATA_TypeDef EP[STM32ENDPOINTS];
} USB_BtableDef;
#endif // __USB_DEFS_H__

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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"
ep_t endpoints[STM32ENDPOINTS];
usb_dev_t USB_Dev;
static usb_LineCoding lineCoding = {115200, 0, 0, 8};
static config_pack_t setup_packet;
static uint8_t ep0databuf[EP0DATABUF_SIZE];
static uint8_t ep0dbuflen = 0;
usb_LineCoding getLineCoding(){return lineCoding;}
uint8_t usbON = 0; // device disconnected from terminal
// definition of parts common for USB_DeviceDescriptor & USB_DeviceQualifierDescriptor
#define bcdUSB_L 0x10
#define bcdUSB_H 0x01
#define bDeviceClass 0
#define bDeviceSubClass 0
#define bDeviceProtocol 0
#define bNumConfigurations 1
static const uint8_t USB_DeviceDescriptor[] = {
18, // bLength
0x01, // bDescriptorType - Device descriptor
bcdUSB_L, // bcdUSB_L - 1.10
bcdUSB_H, // bcdUSB_H
bDeviceClass, // bDeviceClass - USB_COMM
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0_BUFSZ, // bMaxPacketSize
0x7b, // idVendor_L PL2303: VID=0x067b, PID=0x2303
0x06, // idVendor_H
0x03, // idProduct_L
0x23, // idProduct_H
0x00, // bcdDevice_Ver_L
0x03, // bcdDevice_Ver_H
0x01, // iManufacturer
0x02, // iProduct
0x00, // iSerialNumber
bNumConfigurations // bNumConfigurations
};
static const uint8_t USB_DeviceQualifierDescriptor[] = {
10, //bLength
0x06, // bDescriptorType - Device qualifier
bcdUSB_L, // bcdUSB_L
bcdUSB_H, // bcdUSB_H
bDeviceClass, // bDeviceClass
bDeviceSubClass, // bDeviceSubClass
bDeviceProtocol, // bDeviceProtocol
USB_EP0_BUFSZ, // bMaxPacketSize0
bNumConfigurations, // bNumConfigurations
0x00 // Reserved
};
static const uint8_t USB_ConfigDescriptor[] = {
/*Configuration Descriptor*/
0x09, /* bLength: Configuration Descriptor size */
0x02, /* bDescriptorType: Configuration */
39, /* wTotalLength:no of returned bytes */
0x00,
0x01, /* bNumInterfaces: 1 interface */
0x01, /* bConfigurationValue: Configuration value */
0x00, /* iConfiguration: Index of string descriptor describing the configuration */
0xa0, /* bmAttributes - Bus powered, Remote wakeup */
0x32, /* MaxPower 100 mA */
/*---------------------------------------------------------------------------*/
/*Interface Descriptor */
0x09, /* bLength: Interface Descriptor size */
0x04, /* bDescriptorType: Interface */
0x00, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x03, /* bNumEndpoints: 3 endpoints used */
0xff, /* bInterfaceClass */
0x00, /* bInterfaceSubClass */
0x00, /* bInterfaceProtocol */
0x00, /* iInterface: */
///////////////////////////////////////////////////
/*Endpoint 1 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x81, /* bEndpointAddress IN1 */
0x03, /* bmAttributes: Interrupt */
0x0a, /* wMaxPacketSize LO: */
0x00, /* wMaxPacketSize HI: */
0x01, /* bInterval: */
/*Endpoint OUT2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x02, /* bEndpointAddress: OUT2 */
0x02, /* bmAttributes: Bulk */
(USB_RXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
(USB_RXBUFSZ >> 8),
0x00, /* bInterval: ignore for Bulk transfer */
/*Endpoint IN3 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
0x05, /* bDescriptorType: Endpoint */
0x83, /* bEndpointAddress IN3 */
0x02, /* bmAttributes: Bulk */
(USB_TXBUFSZ & 0xff), /* wMaxPacketSize: 64 */
(USB_TXBUFSZ >> 8),
0x00, /* bInterval: ignore for Bulk transfer */
};
_USB_LANG_ID_(USB_StringLangDescriptor, LANG_US);
// these descriptors are not used in PL2303 emulator!
_USB_STRING_(USB_StringSerialDescriptor, u"0");
_USB_STRING_(USB_StringManufacturingDescriptor, u"Prolific Technology Inc.");
_USB_STRING_(USB_StringProdDescriptor, u"USB-Serial Controller");
/*
* default handlers
*/
// SET_LINE_CODING
void WEAK linecoding_handler(usb_LineCoding __attribute__((unused)) *lc){
}
// SET_CONTROL_LINE_STATE
void WEAK clstate_handler(uint16_t __attribute__((unused)) val){
}
// SEND_BREAK
void WEAK break_handler(){
}
// handler of vendor requests
void WEAK vendor_handler(config_pack_t *packet){
if(packet->bmRequestType & 0x80){ // read
uint8_t c;
switch(packet->wValue){
case 0x8484:
c = 2;
break;
case 0x0080:
c = 1;
break;
case 0x8686:
c = 0xaa;
break;
default:
c = 0;
}
EP_WriteIRQ(0, &c, 1);
}else{ // write ZLP
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
}
static void wr0(const uint8_t *buf, uint16_t size){
if(setup_packet.wLength < size) size = setup_packet.wLength; // shortened request
if(size < endpoints[0].txbufsz){
EP_WriteIRQ(0, buf, size);
return;
}
while(size){
uint16_t l = size;
if(l > endpoints[0].txbufsz) l = endpoints[0].txbufsz;
EP_WriteIRQ(0, buf, l);
buf += l;
size -= l;
uint8_t needzlp = (l == endpoints[0].txbufsz) ? 1 : 0;
if(size || needzlp){ // send last data buffer
uint16_t status = KEEP_DTOG(USB->EPnR[0]);
// keep DTOGs, clear CTR_RX,TX, set TX VALID, leave stat_Rx
USB->EPnR[0] = (status & ~(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, (uint8_t*)0, 0);
}
}
}
static inline void get_descriptor(){
switch(setup_packet.wValue){
case DEVICE_DESCRIPTOR:
wr0(USB_DeviceDescriptor, sizeof(USB_DeviceDescriptor));
break;
case CONFIGURATION_DESCRIPTOR:
wr0(USB_ConfigDescriptor, sizeof(USB_ConfigDescriptor));
break;
case STRING_LANG_DESCRIPTOR:
wr0((const uint8_t *)&USB_StringLangDescriptor, STRING_LANG_DESCRIPTOR_SIZE_BYTE);
break;
case STRING_MAN_DESCRIPTOR:
wr0((const uint8_t *)&USB_StringManufacturingDescriptor, USB_StringManufacturingDescriptor.bLength);
break;
case STRING_PROD_DESCRIPTOR:
wr0((const uint8_t *)&USB_StringProdDescriptor, USB_StringProdDescriptor.bLength);
break;
case STRING_SN_DESCRIPTOR:
wr0((const uint8_t *)&USB_StringSerialDescriptor, USB_StringSerialDescriptor.bLength);
break;
case DEVICE_QUALIFIER_DESCRIPTOR:
wr0(USB_DeviceQualifierDescriptor, USB_DeviceQualifierDescriptor[0]);
break;
default:
break;
}
}
static uint8_t configuration = 0; // reply for GET_CONFIGURATION (==1 if configured)
static inline void std_d2h_req(){
uint16_t status = 0; // bus powered
switch(setup_packet.bRequest){
case GET_DESCRIPTOR:
get_descriptor();
break;
case GET_STATUS:
EP_WriteIRQ(0, (uint8_t *)&status, 2); // send status: Bus Powered
break;
case GET_CONFIGURATION:
EP_WriteIRQ(0, &configuration, 1);
break;
default:
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_Dev.USB_Addr = setup_packet.wValue;
break;
case SET_CONFIGURATION:
// Now device configured
USB_Dev.USB_Status = USB_STATE_CONFIGURED;
configuration = setup_packet.wValue;
break;
default:
break;
}
}
/*
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(){
uint16_t epstatus = USB->EPnR[0]; // EP0R on input -> return this value after modifications
uint8_t reqtype = setup_packet.bmRequestType & 0x7f;
uint8_t dev2host = (setup_packet.bmRequestType & 0x80) ? 1 : 0;
int rxflag = RX_FLAG(epstatus);
if(rxflag && SETUP_FLAG(epstatus)){
switch(reqtype){
case STANDARD_DEVICE_REQUEST_TYPE: // standard device request
if(dev2host){
std_d2h_req();
}else{
std_h2d_req();
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
break;
case STANDARD_ENDPOINT_REQUEST_TYPE: // standard endpoint request
if(setup_packet.bRequest == CLEAR_FEATURE){
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
break;
case VENDOR_REQUEST_TYPE:
vendor_handler(&setup_packet);
break;
case CONTROL_REQUEST_TYPE:
switch(setup_packet.bRequest){
case GET_LINE_CODING:
EP_WriteIRQ(0, (uint8_t*)&lineCoding, sizeof(lineCoding));
break;
case SET_LINE_CODING: // omit this for next stage, when data will come
break;
case SET_CONTROL_LINE_STATE:
usbON = 1;
clstate_handler(setup_packet.wValue);
break;
case SEND_BREAK:
usbON = 0;
break_handler();
break;
default:
break;
}
if(setup_packet.bRequest != GET_LINE_CODING) EP_WriteIRQ(0, (uint8_t *)0, 0); // write acknowledgement
break;
default:
EP_WriteIRQ(0, (uint8_t *)0, 0);
}
}else if(rxflag){ // got data over EP0 or host acknowlegement
if(endpoints[0].rx_cnt){
if(setup_packet.bRequest == SET_LINE_CODING){
linecoding_handler((usb_LineCoding*)ep0databuf);
}
}
} else if(TX_FLAG(epstatus)){ // package transmitted
// now we can change address after enumeration
if ((USB->DADDR & USB_DADDR_ADD) != USB_Dev.USB_Addr){
USB->DADDR = USB_DADDR_EF | USB_Dev.USB_Addr;
// change state to ADRESSED
USB_Dev.USB_Status = USB_STATE_ADDRESSED;
}
}
epstatus = KEEP_DTOG(USB->EPnR[0]);
if(rxflag) epstatus ^= USB_EPnR_STAT_TX; // start ZLP/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;
}
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 || rxsz > USB_BTABLE_SIZE) return 1; // buffer too large
if(lastaddr + txsz + rxsz >= USB_BTABLE_SIZE) 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 || rxsz > 512) 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*2);
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 = (uint16_t *)(USB_BTABLE_BASE + lastaddr*2);
lastaddr += rxsz;
USB_BTABLE->EP[number].USB_COUNT_RX = countrx << 10;
endpoints[number].func = func;
return 0;
}
// standard IRQ handler
void usb_lp_can_rx0_isr(){
if(USB->ISTR & USB_ISTR_RESET){
usbON = 0;
// Reinit registers
USB->CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM | USB_CNTR_SUSPM | USB_CNTR_WKUPM;
USB->ISTR = 0;
// 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_Dev.USB_Status = USB_STATE_DEFAULT;
USB->ISTR = ~USB_ISTR_RESET;
if(EP_Init(0, EP_TYPE_CONTROL, USB_EP0_BUFSZ, USB_EP0_BUFSZ, EP0_Handler)){
return;
}
}
if(USB->ISTR & USB_ISTR_CTR){
// EP number
uint8_t n = USB->ISTR & USB_ISTR_EPID;
// copy status register
uint16_t epstatus = USB->EPnR[n];
// copy received bytes amount
endpoints[n].rx_cnt = USB_BTABLE->EP[n].USB_COUNT_RX & 0x3FF; // low 10 bits is counter
// 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(n == 0){ // control endpoint
if(epstatus & USB_EPnR_SETUP){ // setup packet -> copy data to conf_pack
EP_Read(0, (uint16_t*)&setup_packet);
ep0dbuflen = 0;
// interrupt handler will be called later
}else if(epstatus & USB_EPnR_CTR_RX){ // data packet -> push received data to ep0databuf
ep0dbuflen = endpoints[0].rx_cnt;
EP_Read(0, (uint16_t*)&ep0databuf);
}
}
}
// call EP handler
if(endpoints[n].func) endpoints[n].func(endpoints[n]);
}
if(USB->ISTR & USB_ISTR_SUSP){ // suspend -> still no connection, may sleep
usbON = 0;
USB->CNTR |= USB_CNTR_FSUSP | USB_CNTR_LP_MODE;
USB->ISTR = ~USB_ISTR_SUSP;
}
if(USB->ISTR & USB_ISTR_WKUP){ // wakeup
USB->CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LP_MODE); // clear suspend flags
USB->ISTR = ~USB_ISTR_WKUP;
}
}
/**
* 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){
uint8_t i;
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;
uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
for(i = 0; i < N2; ++i, ++out){
*out = buf16[i];
}
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 status = KEEP_DTOG(USB->EPnR[number]);
// keep DTOGs, clear CTR_TX & set TX VALID to start transmission
USB->EPnR[number] = (status & ~(USB_EPnR_CTR_TX)) ^ 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, uint16_t *buf){
int sz = endpoints[number].rx_cnt;
if(!sz) return 0;
endpoints[number].rx_cnt = 0;
int n = (sz + 1) >> 1;
uint32_t *in = (uint32_t *)endpoints[number].rx_buf;
if(n){
for(int i = 0; i < n; ++i, ++in)
buf[i] = *(uint16_t*)in;
}
return sz;
}

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/*
* This file is part of the BMP280 project.
* Copyright 2020 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 __USB_LIB_H__
#define __USB_LIB_H__
#include <wchar.h>
#include "usb_defs.h"
#define EP0DATABUF_SIZE (64)
#define LASTADDR_DEFAULT (STM32ENDPOINTS * 8)
// bmRequestType & 0x7f
#define STANDARD_DEVICE_REQUEST_TYPE 0
#define STANDARD_ENDPOINT_REQUEST_TYPE 2
#define VENDOR_REQUEST_TYPE 0x40
#define CONTROL_REQUEST_TYPE 0x21
// bRequest, standard; for bmRequestType == 0x80
#define GET_STATUS 0x00
#define GET_DESCRIPTOR 0x06
#define GET_CONFIGURATION 0x08
// for bmRequestType == 0
#define CLEAR_FEATURE 0x01
#define SET_FEATURE 0x03 // unused
#define SET_ADDRESS 0x05
#define SET_DESCRIPTOR 0x07 // unused
#define SET_CONFIGURATION 0x09
// for bmRequestType == 0x81, 1 or 0xB2
#define GET_INTERFACE 0x0A // unused
#define SET_INTERFACE 0x0B // unused
#define SYNC_FRAME 0x0C // unused
#define VENDOR_REQUEST 0x01 // unused
// 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
// wValue
#define DEVICE_DESCRIPTOR 0x100
#define CONFIGURATION_DESCRIPTOR 0x200
#define STRING_LANG_DESCRIPTOR 0x300
#define STRING_MAN_DESCRIPTOR 0x301
#define STRING_PROD_DESCRIPTOR 0x302
#define STRING_SN_DESCRIPTOR 0x303
#define DEVICE_QUALIFIER_DESCRIPTOR 0x600
#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))
// USB state: uninitialized, addressed, ready for use
typedef enum{
USB_STATE_DEFAULT,
USB_STATE_ADDRESSED,
USB_STATE_CONFIGURED,
USB_STATE_CONNECTED
} USB_state;
// EP types
#define EP_TYPE_BULK 0x00
#define EP_TYPE_CONTROL 0x01
#define EP_TYPE_ISO 0x02
#define EP_TYPE_INTERRUPT 0x03
#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}
#define STRING_LANG_DESCRIPTOR_SIZE_BYTE (4)
// 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
uint16_t *rx_buf; // reception buffer address
void (*func)(); // endpoint action function
unsigned rx_cnt : 10; // received data counter
} ep_t;
// USB status & its address
typedef struct {
uint8_t USB_Status;
uint16_t USB_Addr;
}usb_dev_t;
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;
typedef struct {
uint8_t bmRequestType;
uint8_t bNotificationType;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
} __attribute__ ((packed)) usb_cdc_notification;
extern ep_t endpoints[];
extern usb_dev_t USB_Dev;
extern uint8_t usbON;
void USB_Init();
void USB_ResetState();
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, uint16_t *buf);
usb_LineCoding getLineCoding();
void linecoding_handler(usb_LineCoding *lc);
void clstate_handler(uint16_t val);
void break_handler();
void vendor_handler(config_pack_t *packet);
#endif // __USB_LIB_H__