/** @brief Function initialization and configuration of RTC driver instance.
*/
static void rtc_config(void) {
uint32_t err_code;
//Initialize RTC instance
err_code = nrf_drv_rtc_init(&rtc1, NULL, rtc1_handler);
APP_ERROR_CHECK(err_code);
//Disable tick event & interrupt
nrf_drv_rtc_tick_enable(&rtc1,false);
/*
|----| |----|
| | | |
____| |______________________..._____| |____...
1s 1s 8s 1s 1s
*/
//Set compare channel 0 to trigger interrupt after RTC1_CC_VALUE*125ms
err_code = nrf_drv_rtc_cc_set(&rtc1,0,RTC1_CC_VALUE,true);
APP_ERROR_CHECK(err_code);
//Set compare channel 1 to trigger interrupt after RTC1_CC_VALUE*125ms*2
err_code = nrf_drv_rtc_cc_set(&rtc1,1,RTC1_CC_VALUE*2,true);
APP_ERROR_CHECK(err_code);
//Set compare channel 2 to trigger interrupt after RTC1_CC_VALUE*125ms*9
err_code = nrf_drv_rtc_cc_set(&rtc1,2,RTC1_CC_VALUE*10,true);
APP_ERROR_CHECK(err_code);
//Power on RTC instance
nrf_drv_rtc_enable(&rtc1);
}
static void rtc_handler(nrf_drv_rtc_int_type_t int_type)
{
uint32_t err_code;
if (int_type == NRF_DRV_RTC_INT_COMPARE0)
{
nrf_drv_saadc_sample(); //Trigger the SAADC SAMPLE task
LEDS_INVERT(BSP_LED_0_MASK); //Toggle LED1 to indicate SAADC sampling start
err_code = nrf_drv_rtc_cc_set(&rtc,0,RTC_CC_VALUE,true); //Set RTC compare value. This needs to be done every time as the nrf_drv_rtc clears the compare register on every compare match
APP_ERROR_CHECK(err_code);
nrf_drv_rtc_counter_clear(&rtc); //Clear the RTC counter to start count from zero
}
}
static void rtc_config(void)
{
uint32_t err_code;
//Initialize RTC instance
nrf_drv_rtc_config_t rtc_config;
rtc_config.prescaler = RTC_FREQ_TO_PRESCALER(RTC_FREQUENCY);
err_code = nrf_drv_rtc_init(&rtc, &rtc_config, rtc_handler); //Initialize the RTC with callback function rtc_handler. The rtc_handler must be implemented in this applicaiton. Passing NULL here for RTC configuration means that configuration will be taken from the sdk_config.h file.
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_rtc_cc_set(&rtc,0,RTC_CC_VALUE,true); //Set RTC compare value to trigger interrupt. Configure the interrupt frequency by adjust RTC_CC_VALUE and RTC_FREQUENCY constant in top of main.c
APP_ERROR_CHECK(err_code);
//Power on RTC instance
nrf_drv_rtc_enable(&rtc); //Enable RTC
}
/** @brief Function initialization and configuration of RTC driver instance.
*/
static void rtc_config(void)
{
uint32_t err_code;
//Initialize RTC instance
nrf_drv_rtc_config_t config = NRF_DRV_RTC_DEFAULT_CONFIG;
config.prescaler = 4095;
err_code = nrf_drv_rtc_init(&rtc, &config, rtc_handler);
APP_ERROR_CHECK(err_code);
//Enable tick event & interrupt
nrf_drv_rtc_tick_enable(&rtc,true);
//Set compare channel to trigger interrupt after COMPARE_COUNTERTIME seconds
err_code = nrf_drv_rtc_cc_set(&rtc,0,COMPARE_COUNTERTIME * 8,true);
APP_ERROR_CHECK(err_code);
//Power on RTC instance
nrf_drv_rtc_enable(&rtc);
}
static inline void rtc_cc_schedule(unsigned chan, unsigned time)
{
ret_code_t err_code = nrf_drv_rtc_cc_set(&g_rtc, chan, rtc_current() + time, true);
APP_ERROR_CHECK(err_code);
}
