Using app_timer callback

[Andrei]

Hello, I'm trying to do a millisecond counter using app_timer but the callback is never called. I think I have missunderstood how it works. I've tried using the app_timer with or without softdevice, in debug mode and without debug mode, but still the timeout handler is not called.

What am I doing wrong?

Thank you.

My code is as follows:

static void timeout_handler(void * p_context)
{
    //UNUSED_PARAMETER(p_context);
    //battery_start();

    simple_uart_putstring((const uint8_t *)"time!\n\r");
    millis+=20;
}

int main(void)
{
simple_uart_config(RTS_PIN_NUMBER, TX_PIN_NUMBER, CTS_PIN_NUMBER, RX_PIN_NUMBER, HWFC);
simple_uart_putstring((const uint8_t *)"Start using device \n\r");

APP_TIMER_INIT(0, 4, 5, false);

  NRF_CLOCK->TASKS_LFCLKSTART = 1;

    	while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);
    	NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;

      
      NRF_CLOCK->TASKS_LFCLKSTART = 1;

      while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0);

        // Create timer
      err_code = app_timer_create(&test_timer_id, APP_TIMER_MODE_REPEATED, timeout_handler);
      APP_ERROR_CHECK(err_code);

      err_code =app_timer_start(test_timer_id, 100, NULL);
      APP_ERROR_CHECK(err_code);

uint8_t sd_is_enabled;
while (true)
{

	    (void)sd_softdevice_is_enabled(&sd_is_enabled);
	    if (sd_is_enabled)
	    {
	        uint32_t err_code = sd_app_event_wait();
	        APP_ERROR_CHECK(err_code);
	    }
	    else
	        __WFI()
}

}

[cocoa]

This code is tested on EK board with soft device, the callback from timer is called every 500 ms.

#define LED0	 18
#define LED1	 19
#define BTN0	 16
#define BTN1	 17

#define PRESCALER				0
#define MAX_TIMERS			1
#define OP_QUEUES_SIZE	4
#define USE_SCHEDULER		false

#define TIMER_MS				500
#define TIMER_TICKS			APP_TIMER_TICKS(TIMER_MS, PRESCALER)



// alloc timer object

static app_timer_id_t			 testTimer;



static void powerManager(void)
{
	 uint32_t error_code;
	 error_code = sd_app_event_wait();
	 APP_ERROR_CHECK(error_code);
}

// Timer callback
static void timerDidEnd(void *nil)
{
	 // blink to say Hello!!
	 nrf_gpio_pin_toggle(LED0);
	 nrf_gpio_pin_toggle(LED1);
}


static void bleEventManager(ble_evt_t *stackEvent)
{
	 // stack event received
	 // do nothing
	 switch (stackEvent->header.evt_id)
	{
		 default:
			break;
	}
}


int main (void)
{
	 uint32_t errorCode;
	 
	 // I'm alive, led0 on
	 GPIO_LED_CONFIG(LED0);
	 GPIO_LED_CONFIG(LED1);
	 nrf_gpio_pin_set(LED0);
	 
	 
	 // stack init
	 BLE_STACK_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_20_PPM,
													BLE_L2CAP_MTU_DEF,
													bleEventManager,
													false);

	 // init timer module
	 APP_TIMER_INIT(PRESCALER, MAX_TIMERS, OP_QUEUES_SIZE, USE_SCHEDULER);
	 
	 // create a timer
	 errorCode = app_timer_create(&testTimer,
																 APP_TIMER_MODE_REPEATED,
																 timerDidEnd);
	 
	 APP_ERROR_CHECK(errorCode);
	 
	 // timer starts,
	 errorCode = app_timer_start(testTimer,
																TIMER_TICKS,
																NULL);
	 APP_ERROR_CHECK(errorCode);
	 
	 
	 for(;;)
		 {
			 powerManager();
	   }
	 
	 
}

-c

[bg2bkk]

thank you, it can be applied on my project directly. I have no other configurations.