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Add BME280 over SPI

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This commit is contained in:
Edward Emelianov 2025-10-05 00:10:02 +03:00
parent f994799353
commit 17b4d714e0
16 changed files with 826 additions and 39 deletions
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399
F3:F303/MLX90640-allsky/BMP280.c Normal file
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@ -0,0 +1,399 @@
/**
* 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 "hardware.h"
#include "spi.h"
#include "BMP280.h"
#include "usb_dev.h" // DBG
#ifdef EBUG
#include "strfunc.h"
extern volatile uint32_t Tms;
#endif
#include <string.h>
#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_IMCOPY (1<<0) // im-copy (sensor busy)
#define BME280_STATUS_MSRGOOD (1<<2) // measurement is good (undocumented bit)
#define BMP280_STATUS_MSRNG (1<<3) // measuring in process
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};
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 (64)
static uint8_t SPIbuf[SPI_BUFSIZE];
// work with BME280 register over SPI
static uint8_t *read_regs(uint8_t reg, uint8_t len){
if(len > SPI_BUFSIZE-2) return NULL;
SPI_CS_0();
bzero(SPIbuf, sizeof(SPIbuf));
SPIbuf[0] = reg | 0x80;
int r = spi_writeread(SPIbuf, len+1);
SPI_CS_1();
if(!r) return NULL;
#ifdef EBUG
USB_sendstr("Register "); USB_sendstr(uhex2str(reg)); USB_sendstr(": ");
hexdump(USB_sendstr, SPIbuf + 1, len);
#endif
return SPIbuf + 1;
}
static int read_reg(uint8_t reg, uint8_t *val){
uint8_t *got = read_regs(reg, 1);
if(!got) return 0;
if(val) *val = *got;
return 1;
}
static int write_reg(uint8_t reg, uint8_t val){
SPI_CS_0();
SPIbuf[0] = reg & 0x7F; // clear MSbit for writing
SPIbuf[1] = val;
uint8_t r = spi_writeread(SPIbuf, 2);
SPI_CS_1();
return r;
}
void BMP280_setup(){
bmpstatus = BMP280_NOTINIT;
spi_setup();
}
// 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(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(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:");
if(!read_reg(BMP280_REG_ID, &params.ID)){
DBG("Can't get ID");
return 0;
}
if(params.ID != BMP280_CHIP_ID && params.ID != BME280_CHIP_ID){
DBG("Not BMP/BME");
return 0;
}
if(!write_reg(BMP280_REG_RESET, BMP280_RESET_VALUE)){
DBG("Can't reset");
return 0;
}
uint8_t reg = 1;
int ntries = 100;
while((reg & BMP280_STATUS_IMCOPY) && --ntries){
IWDG->KR = IWDG_REFRESH;
if(!read_reg(BMP280_REG_STATUS, &reg)){
DBG("can't get status");
return 0;
}
}
if(ntries < 0){
DBG("Timeout getting status");
return 0;
}
if(!readcompdata()){
DBG("Can't read calibration data");
return 0;
}
// write filter configuration
reg = params.filter << 2;
if(!write_reg(BMP280_REG_CONFIG, reg)){DBG("Can't save filter settings");}
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");
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");
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");
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 | BMP280_STATUS_IMCOPY)) return; // still busy
/*if(params.ID == BME280_CHIP_ID && !(reg & BME280_STATUS_MSRGOOD)){ // check if data is good
DBG("Wrong data!");
bmpstatus = BMP280_RELAX;
read_regs(BMP280_REG_ALLDATA, 8);
return;
}*/
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(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;
if(T){
int32_t Temp = compTemp(t, &t_fine);
*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){
if(H < 1e-3) return -300.f;
float gamma = 17.27f * T / (237.7f + T) + logf(H/100.f);
if(fabsf(17.27f - gamma) < 1e-3) return -300.f;
return (237.7f * gamma)/(17.27f - gamma);
}

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F3:F303/MLX90640-allsky/BMP280.h Normal file
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@ -0,0 +1,96 @@
/**
* 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();
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__

24
F3:F303/MLX90640-allsky/Readme.md
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@ -13,21 +13,29 @@ Protocol:
```
dn - draw nth image in ASCII
gn - get nth image 'as is' - float array of 768x4 bytes
l - list active sensors IDs
mn - show temperature map of nth image
tn - show nth image aquisition time
B - reinit BME280
E - get environment parameters (temperature etc)
G - get MLX state
R - reset device
T - print current Tms
Debugging options:
aa - change I2C address to a (a should be non-shifted value!!!)
c - continue MLX
d - draw image in ASCII
i0..4 - setup I2C with speed 10k, 100k, 400k, 1M or 2M (experimental!)
p - pause MLX
r0..3 - change resolution (0 - 16bit, 3 - 19-bit)
t - show temperature map
C - "cartoon" mode on/off (show each new image)
D - dump MLX parameters
G - get MLX state
Ia addr - set device address
s - stop MLX (and start from zero @ 'c')
C - "cartoon" mode on/off (show each new image) - USB only!!!
Dn - dump MLX parameters for sensor number n
Ia addr [n] - set device address for interactive work or (with n) change address of n'th sensor
Ir reg n - read n words from 16-bit register
Iw words - send words (hex/dec/oct/bin) to I2C
Is - scan I2C bus
T - print current Tms
Us - send string 's' to other interface
```

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F3:F303/MLX90640-allsky/allsky.bin
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76
F3:F303/MLX90640-allsky/hardware.c
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@ -16,19 +16,89 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "BMP280.h"
#include "hardware.h"
static inline void gpio_setup(){
static bme280_t environment; // current measurements
#ifndef EBUG
TRUE_INLINE void iwdg_setup(){
uint32_t tmout = 16000000;
/* Enable the peripheral clock RTC */
/* (1) Enable the LSI (40kHz) */
/* (2) Wait while it is not ready */
RCC->CSR |= RCC_CSR_LSION; /* (1) */
while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
/* Configure IWDG */
/* (1) Activate IWDG (not needed if done in option bytes) */
/* (2) Enable write access to IWDG registers */
/* (3) Set prescaler by 64 (1.6ms for each tick) */
/* (4) Set reload value to have a rollover each 2s */
/* (5) Check if flags are reset */
/* (6) Refresh counter */
IWDG->KR = IWDG_START; /* (1) */
IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
IWDG->PR = IWDG_PR_PR_1; /* (3) */
IWDG->RLR = 1250; /* (4) */
tmout = 16000000;
while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
IWDG->KR = IWDG_REFRESH; /* (6) */
}
#endif
TRUE_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;
GPIOB->MODER = MODER_O(0) | MODER_O(1) | MODER_O(2);
pin_set(GPIOB, 1<<1);
SPI_CS_1();
}
void hw_setup(){
gpio_setup();
#ifndef EBUG
iwdg_setup();
#endif
}
int bme_init(){
BMP280_setup();
if(!BMP280_init()) return 0;
if(!BMP280_start()) return 0;
return 1;
}
// process sensor and make measurements
void bme_process(){
static uint32_t Tmeas = 0;
BMP280_status s = BMP280_get_status();
if(s != BMP280_NOTINIT){
if(s == BMP280_ERR) BMP280_init();
else{
BMP280_process();
s = BMP280_get_status(); // refresh status after processing
float Temperature, Pressure, Humidity;
if(s == BMP280_RDY && BMP280_getdata(&Temperature, &Pressure, &Humidity)){
environment.Tdew = Tdew(Temperature, Humidity);
environment.T = Temperature;
environment.P = Pressure;
environment.H = Humidity;
environment.Tmeas = Tms;
}
if(Tms - Tmeas > ENV_MEAS_PERIOD-1){
if(BMP280_start()) Tmeas = Tms;
}
}
}
}
int get_environment(bme280_t *env){
if(!env) return 0;
*env = environment;
if(Tms - environment.Tmeas > 2*ENV_MEAS_PERIOD) return 0; // data may be wrong
return 1; // good data
}

19
F3:F303/MLX90640-allsky/hardware.h
View File

@ -25,7 +25,24 @@
#define USBPU_ON() pin_clear(USBPU_port, USBPU_pin)
#define USBPU_OFF() pin_set(USBPU_port, USBPU_pin)
// SPI_CS - PB2
#define SPI_CS_1() pin_set(GPIOB, 1<<2)
#define SPI_CS_0() pin_clear(GPIOB, 1<<2)
// interval of environment measurements, ms
#define ENV_MEAS_PERIOD (10000)
typedef struct{
float T; // temperature, degC
float Tdew; // dew point, degC
float P; // pressure, Pa
float H; // humidity, percents
uint32_t Tmeas; // time of measurement
} bme280_t;
extern volatile uint32_t Tms;
void hw_setup();
int bme_init();
void bme_process();
int get_environment(bme280_t *env);

2
F3:F303/MLX90640-allsky/ir-allsky.creator.user
View File

@ -1,6 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE QtCreatorProject>
<!-- Written by QtCreator 17.0.1, 2025-09-29T22:10:22. -->
<!-- Written by QtCreator 17.0.1, 2025-10-05T00:09:36. -->
<qtcreator>
<data>
<variable>EnvironmentId</variable>

4
F3:F303/MLX90640-allsky/ir-allsky.files
View File

@ -1,3 +1,5 @@
BMP280.c
BMP280.h
hardware.c
hardware.h
i2c.c
@ -15,6 +17,8 @@ proto.c
proto.h
ringbuffer.c
ringbuffer.h
spi.c
spi.h
strfunc.c
strfunc.h
usart.c

Side by Side Swipe Overlay

Before

Width:  |  Height:  |  Size: 302 B

After

Width:  |  Height:  |  Size: 332 B

9
F3:F303/MLX90640-allsky/main.c
View File

@ -32,7 +32,7 @@ void sys_tick_handler(void){
++Tms;
}
const char *scanend = "SCANEND\n", *foundid = "FOUNDID=";
static const char *const scanend = "SCANEND\n", *const foundid = "FOUNDID=";
int main(void){
char inbuff[MAXSTRLEN+1];
@ -45,6 +45,7 @@ int main(void){
USBPU_OFF();
hw_setup();
i2c_setup(I2C_SPEED_400K);
bme_init();
USB_setup();
usart_setup(115200);
USBPU_ON();
@ -82,8 +83,9 @@ int main(void){
fp_t *im = mlx_getimage(i);
if(im){
chsendfun(SEND_USB);
U(Sensno); UN(i2str(i));
U(Timage); UN(u2str(Tnow)); drawIma(im);
//U(Sensno); UN(i2str(i));
U(Timage); USB_putbyte('0'+i); USB_putbyte('='); UN(u2str(Tnow));
drawIma(im);
Tlastima[i] = Tnow;
}
}
@ -95,5 +97,6 @@ int main(void){
const char *ans = parse_cmd(got, SEND_USART);
if(ans) usart_sendstr(ans);
}
bme_process();
}
}

65
F3:F303/MLX90640-allsky/proto.c
View File

@ -20,6 +20,7 @@
#include <stm32f3.h>
#include <string.h>
#include "hardware.h"
#include "i2c.h"
#include "mlxproc.h"
#include "proto.h"
@ -64,36 +65,41 @@ void chsendfun(int sendto){
#define printfl(x,n) do{sendfun->S(float2str(x, n));}while(0)
// common names for frequent keys
const char *Timage = "TIMAGE=";
const char *Sensno = "SENSNO=";
const char* const Timage = "TIMAGE";
const char* const Image = "IMAGE";
static const char *const Sensno = "SENSNO=";
static const char *OK = "OK\n", *ERR = "ERR\n";
const char *helpstring =
static const char *const OK = "OK\n", *const ERR = "ERR\n";
const char *const helpstring =
"https://github.com/eddyem/stm32samples/tree/master/F3:F303/MLX90640multi build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
" management of single IR bolometer MLX90640\n"
"aa - change I2C address to a (a should be non-shifted value!!!)\n"
"c - continue MLX\n"
"dn - draw nth image in ASCII\n"
"gn - get nth image 'as is' - float array of 768x4 bytes\n"
"i0..4 - setup I2C with speed 10k, 100k, 400k, 1M or 2M (experimental!)\n"
"l - list active sensors IDs\n"
"mn - show temperature map of nth image\n"
"tn - show nth image aquisition time\n"
"B - reinit BME280\n"
"E - get environment parameters (temperature etc)\n"
"G - get MLX state\n"
"R - reset device\n"
"T - print current Tms\n"
" Debugging options:\n"
"aa - change I2C address to a (a should be non-shifted value!!!)\n"
"c - continue MLX\n"
"i0..4 - setup I2C with speed 10k, 100k, 400k, 1M or 2M (experimental!)\n"
"p - pause MLX\n"
"s - stop MLX (and start from zero @ 'c')\n"
"tn - show nth image aquisition time\n"
"C - \"cartoon\" mode on/off (show each new image) - USB only!!!\n"
"Dn - dump MLX parameters for sensor number n\n"
"G - get MLX state\n"
"Ia addr [n] - set device address for interactive work or (with n) change address of n'th sensor\n"
"Ir reg n - read n words from 16-bit register\n"
"Iw words - send words (hex/dec/oct/bin) to I2C\n"
"Is - scan I2C bus\n"
"T - print current Tms\n"
"Us - send string 's' to other interface\n"
;
TRUE_INLINE const char *setupI2C(char *buf){
static const char *speeds[I2C_SPEED_AMOUNT] = {
static const char * const speeds[I2C_SPEED_AMOUNT] = {
[I2C_SPEED_10K] = "10K",
[I2C_SPEED_100K] = "100K",
[I2C_SPEED_400K] = "400K",
@ -207,7 +213,7 @@ TRUE_INLINE void dumpparams(const char *buf){
if(N < 0){ sendfun->S(ERR); return; }
MLX90640_params *params = mlx_getparams(N);
if(!params){ sendfun->S(ERR); return; }
sendfun->S(Sensno); sendfun->S(i2str(N)); N();
N(); sendfun->S(Sensno); sendfun->S(i2str(N));
sendfun->S("\nkVdd="); printi(params->kVdd);
sendfun->S("\nvdd25="); printi(params->vdd25);
sendfun->S("\nKvPTAT="); printfl(params->KvPTAT, 4);
@ -263,15 +269,15 @@ TRUE_INLINE void getst(){
sendfun->S(states[s]); N();
}
// `draw`==1 - draw, ==0 - show T map, 2 - send raw float array with prefix 'SENSNO=x\nTimage=y\n' and postfix "ENDIMAGE\n"
// `draw`==1 - draw, ==0 - show T map, 2 - send raw float array with prefix 'TIMAGEX=y\nIMAGEX=' and postfix "ENDIMAGE\n"
static const char *drawimg(const char *buf, int draw){
int sensno = getsensnum(buf);
if(sensno > -1){
uint32_t T = mlx_lastimT(sensno);
fp_t *img = mlx_getimage(sensno);
if(img){
sendfun->S(Sensno); sendfun->S(u2str(sensno)); N();
sendfun->S(Timage); sendfun->S(u2str(T)); N();
//sendfun->S(Sensno); sendfun->S(u2str(sensno)); N();
sendfun->S(Timage); sendfun->P('0'+sensno); sendfun->P('='); sendfun->S(u2str(T)); N();
switch(draw){
case 0:
dumpIma(img);
@ -280,7 +286,7 @@ static const char *drawimg(const char *buf, int draw){
drawIma(img);
break;
case 2:
{
sendfun->S(Image); sendfun->P('0'+sensno); sendfun->P('=');
uint8_t *d = (uint8_t*)img;
uint32_t _2send = MLX_PIXNO * sizeof(float);
// send by portions of 256 bytes (as image is larger than ringbuffer)
@ -290,8 +296,8 @@ static const char *drawimg(const char *buf, int draw){
_2send -= portion;
d += portion;
}
}
sendfun->S("ENDIMAGE"); N();
break;
}
return NULL;
}
@ -317,10 +323,22 @@ TRUE_INLINE void listactive(){
static void getimt(const char *buf){
int sensno = getsensnum(buf);
if(sensno > -1){
sendfun->S(Timage); sendfun->S(u2str(mlx_lastimT(sensno))); N();
sendfun->S(Timage); sendfun->P('0'+sensno); sendfun->P('='); sendfun->S(u2str(mlx_lastimT(sensno))); N();
}else sendfun->S(ERR);
}
TRUE_INLINE void getenv(){
bme280_t env;
if(!get_environment(&env)) sendfun->S("BADENVIRONMENT\n");
sendfun->S("TEMPERATURE="); sendfun->S(float2str(env.T, 2));
sendfun->S("\nPRESSURE_HPA="); sendfun->S(float2str(env.P/100.f, 2));
sendfun->S("\nPRESSURE_MM="); sendfun->S(float2str(env.P * 0.00750062f, 2));
sendfun->S("\nHUMIDITY="); sendfun->S(float2str(env.H, 2));
sendfun->S("\nTEMP_DEW="); sendfun->S(float2str(env.Tdew, 1));
sendfun->S("\nT_MEASUREMENT="); sendfun->S(u2str(env.Tmeas));
N();
}
/**
* @brief parse_cmd - user string parser
* @param buf - user data
@ -386,12 +404,21 @@ const char *parse_cmd(char *buf, int sendto){
break;
case 's':
mlx_stop(); return OK;
case 'B':
if(bme_init()) return OK;
return ERR;
case 'C':
if(sendto != SEND_USB) return ERR;
cartoon = !cartoon; return OK;
case 'E':
getenv();
break;
case 'G':
getst();
break;
case 'R':
NVIC_SystemReset();
break;
case 'T':
sendfun->S("T="); sendfun->S(u2str(Tms)); N();
break;
@ -420,7 +447,7 @@ void dumpIma(const fp_t im[MLX_PIXNO]){
#define GRAY_LEVELS (16)
// 16-level character set ordered by fill percentage (provided by user)
static const char* CHARS_16 = " .':;+*oxX#&%B$@";
static const char *const CHARS_16 = " .':;+*oxX#&%B$@";
// draw image in ASCII-art
void drawIma(const fp_t im[MLX_PIXNO]){
// Find min and max values

2
F3:F303/MLX90640-allsky/proto.h
View File

@ -18,7 +18,7 @@
#pragma once
extern const char *Timage, *Sensno;
extern const char *const Timage;
#define SEND_USB (1)
#define SEND_USART (0)

113
F3:F303/MLX90640-allsky/spi.c Normal file
View File

@ -0,0 +1,113 @@
/*
* This file is part of the ir-allsky 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 "spi.h"
#include <string.h> // memcpy
#include "usb_dev.h"
#ifdef EBUG
#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 @ ~280kHz (36MHz/128)
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;
}
uint8_t 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
*/
uint8_t spi_writeread(uint8_t *data, uint8_t n){
if(spi_status != SPI_READY || !data || !n){
DBG("not ready");
return 0;
}
// clear SPI Rx FIFO
spi_onoff(TRUE);
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);
}
spi_onoff(FALSE); // turn off SPI
return 1;
}
// read data through SPI
uint8_t 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){
WAITX(!(SPI1->SR & SPI_SR_RXNE));
data[x] = *((volatile uint8_t*)&SPI1->DR);
}
spi_onoff(FALSE); // turn off SPI
return 1;
}

35
F3:F303/MLX90640-allsky/spi.h Normal file
View File

@ -0,0 +1,35 @@
/*
* This file is part of the ir-allsky 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>
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();
uint8_t spi_waitbsy();
uint8_t spi_writeread(uint8_t *data, uint8_t n);
uint8_t spi_read(uint8_t *data, uint8_t n);

11
F3:F303/MLX90640-allsky/usb_dev.c
View File

@ -165,7 +165,16 @@ int USB_sendall(){
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);
IWDG->KR = IWDG_REFRESH;
int l = RB_datalen((ringbuffer*)&rbout);
if(l < 0) continue;
int portion = rbout.length - 1 - l;
if(portion < 1){
if(lastdsz == 0) send_next();
continue;
}
if(portion > len) portion = len;
int a = RB_write((ringbuffer*)&rbout, buf, portion);
if(a > 0){
len -= a;
buf += a;

6
F3:F303/MLX90640-allsky/usb_dev.h
View File

@ -50,6 +50,12 @@ void linecoding_handler(usb_LineCoding *lc);
#define UN(s) do{USB_sendstr(s); USB_putbyte('\n');}while(0)
#define U(s) USB_sendstr(s)
#ifdef EBUG
#define DBG(s) do{USB_sendstr(s); USB_putbyte('\n');}while(0)
#else
#define DBG(s)
#endif
int USB_sendall();
int USB_send(const uint8_t *buf, int len);
int USB_putbyte(uint8_t byte);

4
F3:F303/MLX90640-allsky/version.inc
View File

@ -1,2 +1,2 @@
#define BUILD_NUMBER "15"
#define BUILD_DATE "2025-09-29"
#define BUILD_NUMBER "36"
#define BUILD_DATE "2025-10-05"