Timer1 Only Firing at 250Hz

[mbush91]

Not sure why but my time is only firing at 250Hz with the prescaler set to 0. Not sure why. Shouldn't it be going at 16Mhz at these settings? (Running on the PCA10028 Board)

namespace drv {

void Timer::Init() {
	// Start 16 MHz crystal oscillator.
	NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
	NRF_CLOCK->TASKS_HFCLKSTART    = 1;

	// Wait for the external oscillator to start up.
	while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0){}

	NRF_TIMER1->MODE = TIMER_MODE_MODE_Timer;

	NRF_TIMER1->PRESCALER   = 0;
	NRF_TIMER1->BITMODE = TIMER_BITMODE_BITMODE_16Bit;
	NVIC_EnableIRQ(TIMER1_IRQn);
	NRF_TIMER1->INTENSET = TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos;

	NRF_TIMER1->CC[0] = 100;
	NRF_TIMER1->TASKS_START = 1;



}

extern "C" {
	void TIMER1_IRQHandler() {
		NRF_TIMER1->EVENTS_COMPARE[0] = 0; // Clear INT
		uint32_t cc;
		cc = NRF_TIMER1->CC[0]++;
		nrf_gpio_pin_toggle(21);
		svc::TimerManager::IncrementTime();

	}
}

} /* namespace drv */

[mbush91]

Figured it out!

Needed to set the TASKS_CLEAR bit. Hope this helps somebody else!

void TIMER1_IRQHandler() {
		NRF_TIMER1->TASKS_CLEAR = 1;

		nrf_gpio_pin_toggle(21);
		svc::TimerManager::IncrementTime();

		NRF_TIMER1->EVENTS_COMPARE[0] = 0; // Clear INT
	}

[Stian Røed Hafskjold]

Thank you for answering your own question!