void saadc_sampling_event_init(void)
{
ret_code_t err_code;
err_code = nrf_drv_ppi_init();
APP_ERROR_CHECK(err_code);
nrf_drv_timer_config_t timer_config = NRF_DRV_TIMER_DEFAULT_CONFIG;
timer_config.frequency = NRF_TIMER_FREQ_31250Hz;
err_code = nrf_drv_timer_init(&m_timer, &timer_config, timer_handler);
APP_ERROR_CHECK(err_code);
/* setup m_timer for compare event */
uint32_t ticks = nrf_drv_timer_ms_to_ticks(&m_timer,SAADC_SAMPLE_RATE);
nrf_drv_timer_extended_compare(&m_timer, NRF_TIMER_CC_CHANNEL0, ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, false);
nrf_drv_timer_enable(&m_timer);
uint32_t timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&m_timer, NRF_TIMER_CC_CHANNEL0);
uint32_t saadc_sample_event_addr = nrf_drv_saadc_sample_task_get();
/* setup ppi channel so that timer compare event is triggering sample task in SAADC */
err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
APP_ERROR_CHECK(err_code);
err_code = nrf_drv_ppi_channel_assign(m_ppi_channel, timer_compare_event_addr, saadc_sample_event_addr);
APP_ERROR_CHECK(err_code);
}
void BSP_init(void) {
uint32_t err_code;
err_code = nrf_drv_timer_init(&TIMER1, NULL, Timer1_handler);
APP_ERROR_CHECK(err_code);
nrf_drv_timer_extended_compare(&TIMER1, NRF_TIMER_CC_CHANNEL0
, nrf_drv_timer_ms_to_ticks(&TIMER1, 1000/BSP_TICKS_PER_SEC)
, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
// Configure button 1 for low accuracy (why not high accuracy?)
Q_ALLEGE(nrf_drv_gpiote_init() == NRF_SUCCESS);
nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);
config.pull = NRF_GPIO_PIN_PULLUP;
Q_ALLEGE(nrf_drv_gpiote_in_init(BTN_PIN, &config, btn1_event_handler)
== NRF_SUCCESS);
nrf_drv_gpiote_in_event_enable(BTN_PIN, /* int enable = */ true);
NRF_GPIO->DIRSET = 1 << GPIO_TP;
/* initialize the QS software tracing... */
if (QS_INIT((void *)0) == 0) {
Q_ERROR();
}
}
/** @brief Function initialization and configuration of timer driver instance.
*/
static void timer_config(void) {
uint32_t time_in_ms = 1000; //Time(in miliseconds) between consecutive compare events.
// see
uint32_t time2ticks;
uint32_t err_code;
err_code = nrf_drv_timer_init(&mytimer1, NULL, timer1_handler);
APP_ERROR_CHECK(err_code);
time2ticks = nrf_drv_timer_ms_to_ticks(&mytimer1, time_in_ms);
/*
|----| |----|
| | | |
____| |______________________..._____| |____...
1s 1s 8s 1s 1s
*/
nrf_drv_timer_extended_compare(&mytimer1, NRF_TIMER_CC_CHANNEL0, time2ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
nrf_drv_timer_enable(&mytimer1);
}
