d8aea1d4ef
In the BLE service data payload, one of the reserved bits is now used to indicate whether or not the ambient lux value is encoded in the packet. Bit 0 of the first byte is now the `has_lux` bit. If it is set, bytes 16-17 in the service data will contain the ambient lux. If `has_lux` is not set, bytes 16-17 may not exist (for compatibility with older firmwares) or may hold meaningless values. This commit also introduces version-specific configuration in prst_config.h. Photoresistor config, for example, is only meaninful for version 1.1.x.
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
#include <stdbool.h>
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#include <stdint.h>
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#include "nrf_delay.h"
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#include "nrf_gpio.h"
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#include "nrf_log.h"
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#include "nrf_log_ctrl.h"
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#include "nrf_log_default_backends.h"
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#include "nrf_pwr_mgmt.h"
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#include "prst/adc.h"
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#include "prst/ble.h"
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#include "prst/pwm.h"
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#include "prst/rtc.h"
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#include "prst/shtc3.h"
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#include "prst_config.h"
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// A small wrap-around counter for deduplicating BLE packets on the receiver.
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static uint8_t run_counter = 0;
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static void log_init(void) {
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APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
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NRF_LOG_DEFAULT_BACKENDS_INIT();
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NRF_LOG_INFO("Log inited.");
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}
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static void gpio_init(void) {
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nrf_gpio_cfg_output(PRST_LED_PIN);
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nrf_gpio_cfg_output(PRST_FAST_DISCH_PIN);
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#ifdef PRST_HAS_LDR
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nrf_gpio_cfg_output(PRST_PHOTO_V_PIN);
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#endif
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NRF_LOG_INFO("GPIO pins inited.");
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}
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static void power_management_init(void) {
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APP_ERROR_CHECK(nrf_pwr_mgmt_init());
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NRF_LOG_INFO("GPIO pins inited.");
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}
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// This FPU exception mask trick is recommended for avoiding unwanted
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// interupts from the floating point unit. This would be pretty bad,
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// since it would wake us up from deep sleep for nothing.
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#define FPU_EXCEPTION_MASK 0x0000009F
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static void power_manage(void) {
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__set_FPSCR(__get_FPSCR() & ~(FPU_EXCEPTION_MASK));
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(void)__get_FPSCR();
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NVIC_ClearPendingIRQ(FPU_IRQn);
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nrf_pwr_mgmt_run();
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}
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// This is the RTC callback in which we do all of our work as quickly as
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// possible:
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// - Measure the soil moisture;
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// - Measure the air temperature and humidity;
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// - Encode the measurements into the BLE advertisement packet;
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// - Turn on BLE advertising for a while;
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// - Turn everything off and return back to sleep.
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static void rtc_callback() {
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nrf_gpio_pin_set(PRST_LED_PIN);
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prst_shtc3_read_t temp_humi = prst_shtc3_read();
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nrf_gpio_pin_set(PRST_FAST_DISCH_PIN);
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prst_pwm_init();
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prst_pwm_start();
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prst_adc_batt_read_t batt_read = prst_adc_batt_read();
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prst_adc_soil_moisture_t soil_read = prst_adc_soil_read(batt_read.voltage);
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prst_pwm_stop();
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nrf_gpio_pin_clear(PRST_FAST_DISCH_PIN);
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uint16_t lux = 0;
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#ifdef PRST_HAS_LDR
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nrf_gpio_pin_set(PRST_PHOTO_V_PIN);
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prst_adc_photo_sensor_t photo_read = prst_adc_photo_read(batt_read.voltage);
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nrf_gpio_pin_clear(PRST_PHOTO_V_PIN);
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lux = photo_read.brightness;
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#endif
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prst_ble_update_adv_data(batt_read.millivolts, temp_humi.temp_millicelcius,
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temp_humi.humidity, soil_read.relative, lux,
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run_counter);
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prst_adv_start();
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nrf_delay_ms(PRST_BLE_ADV_TIME_IN_MS);
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prst_adv_stop();
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nrf_gpio_pin_clear(PRST_LED_PIN);
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NRF_LOG_FLUSH();
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run_counter++;
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}
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int main(void) {
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log_init();
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gpio_init();
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power_management_init();
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prst_ble_init();
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prst_adc_init();
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prst_shtc3_init();
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// Set up RTC. It will call our custom callback at a regular interval, defined
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// by PRST_DEEP_SLEEP_IN_SECONDS.
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prst_rtc_set_callback(rtc_callback);
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prst_rtc_init();
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// In addition to scheduling it, let's immediatelly call it - it makes
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// debugging less tedious.
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rtc_callback();
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// Here we go into a low energy mode. The datasheet calls this mode "System
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// ON", and in my tests it consumes around 2.7uA.
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for (;;) {
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power_manage();
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}
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}
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