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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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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
}