simple timer question

Question

hi, i am going to make a simple timer with SDK 6.0.0, nrf51822 and softdevice.

first, i use ble_app_uart example as a base code, because i need to BLE communication with high frequency.

here is my simple code

int main(void) {

// Initialize
leds_init();
timers_init();
buttons_init();

// uart_init(); ble_stack_init(); gap_params_init(); services_init(); advertising_init(); conn_params_init(); sec_params_init(); nrf_gpio_cfg_output(22);

//NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
	NRF_CLOCK->TASKS_HFCLKSTART;

	//Wait for external oscillator to start up

	NRF_TIMER2->PRESCALER = 4;
	NRF_TIMER2->TASKS_CLEAR;
	NRF_TIMER2->BITMODE = TIMER_BITMODE_BITMODE_16Bit;
	NRF_TIMER2->MODE = TIMER_MODE_MODE_Timer;
	NRF_TIMER2->EVENTS_COMPARE[0] = 0;
	NRF_TIMER2->CC[0] = 400;

	NRF_TIMER2->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos);
	NVIC_EnableIRQ(TIMER2_IRQn);
	NRF_POWER->TASKS_CONSTLAT;
	NRF_TIMER2->TASKS_START;

// simple_uart_putstring(START_STRING);

advertising_start();

// Enter main loop
for (;;)
{

    //power_manage();
}

}

void TIMER2_IRQHandler(void) { NRF_TIMER2->EVENTS_COMPARE[0] = 0; NRF_TIMER2->TASKS_CLEAR; nrf_gpio_pin_toggle(22); nrf_gpio_pin_toggle(21); nrf_gpio_pin_toggle(20); }

the BLE connection is operated well with BLE toolbox. But the timer2 compare interrupt is never called.

and i cannot use the RTS timer with app_timer function because i need more 1/32767 Hz

There is anything that i missed???

RK · Accepted Answer

NRF_TIMER2->TASKS_START;
 
 That doesn't do anything. You have several places you just reference the task like that eg 
 NRF_CLOCK->TASKS_HFCLKSTART;
 
 and 
 NRF_POWER->TASKS_CONSTLAT;
 
 If you want to trigger the task you need to write a '1' to it 
 NRF_TIMER2->TASKS_START = 1;