Hello,
I am trying to use TIMER3 where it should count 1ms ticks for 15 seconds and then stop.
Tried the below code. However it never enters ISR.
Please let me know if I am configuring it incorrectly or something else.
As Channel 0 is being used by Timer 2 already, I have chosen channel 3.
Also tried setting priority to 3.
// Timer tick duration (1 ms = 16000 ticks at 16 MHz)
#define TIMER_TICK_1MS 16000
// Total duration (15 seconds = 15000 ms)
#define TIMER_DURATION_15S (15000 * TIMER_TICK_1MS)
void hw_timer3_init(uint32_t tick_count)
{
// Stop Timer 3 before configuring
nrf_timer_task_trigger(NRF_TIMER3, NRF_TIMER_TASK_STOP);
// Configure TIMER3 in Timer mode
nrf_timer_mode_set(NRF_TIMER3, NRF_TIMER_MODE_TIMER);
// Set frequency to 16 MHz
nrf_timer_frequency_set(NRF_TIMER3, NRF_TIMER_FREQ_16MHz);
// Set the timer to 32-bit mode
nrf_timer_bit_width_set(NRF_TIMER3, NRF_TIMER_BIT_WIDTH_32);
// Set the compare value (tick_count)
nrf_timer_cc_write(NRF_TIMER3, NRF_TIMER_CC_CHANNEL3, tick_count);
// Enable interrupt for compare event on channel 3
nrf_timer_int_enable(NRF_TIMER3, NRF_TIMER_INT_COMPARE3_MASK);
// Enable TIMER3 interrupt in NVIC
NVIC_EnableIRQ(TIMER3_IRQn);
// Configure the timer to auto-clear on compare match
nrf_timer_shorts_enable(NRF_TIMER3, NRF_TIMER_SHORT_COMPARE3_CLEAR_MASK);
}
void TIMER3_IRQHandler(void)
{
// Check for COMPARE3 event
if (nrf_timer_event_check(NRF_TIMER3, NRF_TIMER_EVENT_COMPARE3))
{
nrf_timer_event_clear(NRF_TIMER3, NRF_TIMER_EVENT_COMPARE3); // Clear the event
// Stop the timer
nrf_timer_task_trigger(NRF_TIMER3, NRF_TIMER_TASK_STOP);
// Set GPIO P1.03 high to indicate timer expiration
nrf_gpio_pin_toggle(NRF_GPIO_PIN_MAP(1, PIN_P1_03));
}
}
Starting Timer 3 in main ()
nrf_timer_task_trigger(NRF_TIMER3, NRF_TIMER_TASK_CLEAR);
nrf_timer_task_trigger(NRF_TIMER3, NRF_TIMER_TASK_START);
