Setting up APP_TIMER results in hardware fault

[perceptron]

I started with the ble_app_template example. This example uses the Button event and notifies it. I modified the project to send some other data as notification, instead of the button state. And for the data to be read an transmitted, I initialized a timer. My timer_init looks like this,

static void timers_init(void)
{
	uint32_t err_code;
    // Initialize timer module, making it use the scheduler
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS,     APP_TIMER_OP_QUEUE_SIZE, true);
	
	err_code = app_timer_create(&m_ldc_timer_id,
                                APP_TIMER_MODE_REPEATED,
                                data_timeout_handler);
    APP_ERROR_CHECK(err_code);
}

where data_time_handler is the event handler for the timer.

My timer_start looks like this:

static void timers_start(void)
{
	  uint32_t err_code = app_timer_start(m_timer_id, HEART_RATE_MEAS_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}

Why would I be going in to a hard fault ?

[RK]

What's err_code in the timers_start() function? If not zero then APP_ERROR_CHECK() is sending you into an error.

Why is your variable called m_ldc_timer_id in the initialization and m_timer_id in the timers_start function? What is HEART_RATE_MEAS_INTERVAL?

[perceptron]

"m_ldc_timer_id" and "m_timer_id" are the same, I made a typo there. Both should have been m_ldc_timer_id. HEART_RATE_MEAS_INTERVAL is set to 32767 (for 1 second).

The device does not go into hard fault while initializing the timer. The device initializes and goes on to execute the main loop (verified through debugger)

// Enter main loop
    for (;;)
    {
        app_sched_execute();
        power_manage();
    }

On a BLE Scanner App I can see that it broadcasts and advertises in the beginning and then goes in to a hard fault.

If I comment the timer initialization code, it seems to work fine. When I say works fine, I can see the device advertising and it appears on the BLE Scanner App. What is the best way to debug this ? Thank you.

[perceptron]

@RK, any clue ?

[Stefan Birnir Sverrisson]

Hi

Have you defined your data_timeout_handler function? If so, what does the data_timeout_handler do? If you set a breakpoint in the data_timeout_handler, does the debugger stop there?

Update 10.2.2015

In order for you to efficiently debug the application code in Keil, the setting should be however Optimization: “Level 0” and “Optimize for Time” should be unchecked

Also check this thread when debugging with a softdevice enabled.

What SDK are you using?

[perceptron]

@Stefan Birnir Sverrisson thanks for your reply! Here is how the data_timeout_handler looks,

static void data_timeout_handler(void * p_context)
{
    UNUSED_PARAMETER(p_context);
    data_event_handler(readData(0));
}

static void data_event_handler(uint16_t data)
{
    uint32_t err_code;
    err_code = ble_lbs_on_data_available(&m_lbs, data);
    APP_ERROR_CHECK(err_code);
}