/** Configures the RTC with TICK for 8Hz
*/
static void rtc0_config(void)
{
NRF_RTC0->PRESCALER = 4095;
NRF_RTC0->INTENSET = RTC_INTENSET_TICK_Msk;
NVIC_EnableIRQ(RTC0_IRQn);
}
/** Init RTC0
*/
static void RTC0_init(void)
{
NRF_RTC0->TASKS_CLEAR = 1;
NRF_RTC0->TASKS_START = 1;
}
void RTC0_IRQHandler(void)
{
if(!ledOn) {
nrf_gpio_pin_set(LED_0);
}
else {
nrf_gpio_pin_clear(LED_0);
}
ledOn = !ledOn;
NRF_TIMER1->TASKS_START = 1;
NRF_RTC0->EVENTS_TICK = 0;
}
/** @brief Function for initializing the PPI peripheral.
*/
static void ppi_init(void)
{
// Configure PPI channel 0 to capture Timer 1 value into the CC[0] register.
// This is achieved when GPIOTE detects Low-to-High transition on pin INPUT_PIN_NUMBER.
NRF_PPI->CH[0].EEP = (uint32_t)&NRF_GPIOTE->EVENTS_IN[0];
NRF_PPI->CH[0].TEP = (uint32_t)&NRF_TIMER1->TASKS_CAPTURE[0];
// Configure PPI channel 1 to capture Timer 1 value into CC[1] register.
// This is achieved when GPIOTE detects High-to-Low transition on pin INPUT_PIN_NUMBER.
NRF_PPI->CH[1].EEP = (uint32_t)&NRF_GPIOTE->EVENTS_IN[1];
NRF_PPI->CH[1].TEP = (uint32_t)&NRF_TIMER1->TASKS_CAPTURE[1];
NRF_PPI->CH[2].EEP = (uint32_t)&NRF_RTC0->EVENTS_TICK;
NRF_PPI->CH[2].TEP = (uint32_t)&NRF_TIMER1->TASKS_START;
// Enable only PPI channels 0 and 1.
NRF_PPI->CHEN = (PPI_CHEN_CH0_Enabled << PPI_CHEN_CH0_Pos)
| (PPI_CHEN_CH1_Enabled << PPI_CHEN_CH1_Pos)
| (PPI_CHEN_CH2_Enabled << PPI_CHEN_CH2_Pos);
}
If I call the NRF_TIMER1->TASKS_START = 1; inside the RTC0_IRQHandler my it works well, timer1 is started and I can use it but don't start it here PPI channel 3 never start the task. The other tasks on the PPI are working ok.
What I'm doing wrong?
