mirror of
https://github.com/eddyem/stm32samples.git
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105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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* This file is part of the ir-allsky project.
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* Copyright 2025 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "BMP280.h"
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#include "hardware.h"
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static bme280_t environment; // current measurements
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#ifndef EBUG
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TRUE_INLINE void iwdg_setup(){
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uint32_t tmout = 16000000;
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/* Enable the peripheral clock RTC */
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/* (1) Enable the LSI (40kHz) */
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/* (2) Wait while it is not ready */
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RCC->CSR |= RCC_CSR_LSION; /* (1) */
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while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
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/* Configure IWDG */
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/* (1) Activate IWDG (not needed if done in option bytes) */
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/* (2) Enable write access to IWDG registers */
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/* (3) Set prescaler by 64 (1.6ms for each tick) */
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/* (4) Set reload value to have a rollover each 2s */
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/* (5) Check if flags are reset */
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/* (6) Refresh counter */
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IWDG->KR = IWDG_START; /* (1) */
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IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
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IWDG->PR = IWDG_PR_PR_1; /* (3) */
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IWDG->RLR = 1250; /* (4) */
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tmout = 16000000;
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while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
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IWDG->KR = IWDG_REFRESH; /* (6) */
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}
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#endif
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TRUE_INLINE void gpio_setup(){
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RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN; // for USART and LEDs
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for(int i = 0; i < 10000; ++i) nop();
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// USB - alternate function 14 @ pins PA11/PA12; SWD - AF0 @PA13/14
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GPIOA->AFR[1] = AFRf(14, 11) | AFRf(14, 12);
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GPIOA->MODER = MODER_AF(11) | MODER_AF(12) | MODER_AF(13) | MODER_AF(14) | MODER_O(15);
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GPIOB->MODER = MODER_O(0) | MODER_O(1) | MODER_O(2);
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pin_set(GPIOB, 1<<1);
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SPI_CS_1();
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}
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void hw_setup(){
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gpio_setup();
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#ifndef EBUG
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iwdg_setup();
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#endif
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}
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int bme_init(){
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BMP280_setup();
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if(!BMP280_init()) return 0;
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if(!BMP280_start()) return 0;
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return 1;
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}
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// process sensor and make measurements
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void bme_process(){
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static uint32_t Tmeas = 0;
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BMP280_status s = BMP280_get_status();
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if(s != BMP280_NOTINIT){
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if(s == BMP280_ERR) BMP280_init();
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else{
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BMP280_process();
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s = BMP280_get_status(); // refresh status after processing
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float Temperature, Pressure, Humidity;
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if(s == BMP280_RDY && BMP280_getdata(&Temperature, &Pressure, &Humidity)){
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environment.Tdew = Tdew(Temperature, Humidity);
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environment.T = Temperature;
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environment.P = Pressure;
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environment.H = Humidity;
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environment.Tmeas = Tms;
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}
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if(Tms - Tmeas > ENV_MEAS_PERIOD-1){
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if(BMP280_start()) Tmeas = Tms;
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}
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}
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}
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}
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int get_environment(bme280_t *env){
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if(!env) return 0;
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*env = environment;
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if(Tms - environment.Tmeas > 2*ENV_MEAS_PERIOD) return 0; // data may be wrong
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return 1; // good data
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}
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