Hi,
I work on the nRF52840 DK with the ble_app_uart example and I want to add a timer using app_timer api,
in order to create RTC time/date timestamps for my sensors raw data.
As a first step, I followed the application timer tutorial and I created a simple repeated timer that blinks an LED every 100 mSec .
In the following code I pasted only the main() function and the timer functions I wrote. Everything else is the same with the ble_uart example
static void timer_handler(void * p_context)
{
bsp_board_led_invert(BSP_BOARD_LED_3);
}
void timerCreator(void){
ret_code_t err_timer;
APP_TIMER_DEF(m_timer);
err_timer = app_timer_create(&m_timer, APP_TIMER_MODE_REPEATED, timer_handler);
APP_ERROR_CHECK(err_timer);
err_timer = app_timer_start(m_timer,APP_TIMER_TICKS(100),NULL);
APP_ERROR_CHECK(err_timer);
}
//========================================================================================================
/**@brief Application main function.
*/
int main(void)
{
// Initialize.
bool erase_bonds;
gpiote_init();
uart_init();
log_init();
timers_init();
timerCreator(); //<<<============= Create RTC Timer
buttons_leds_init(&erase_bonds);
power_management_init();
ble_stack_init();
gap_params_init();
gatt_init();
services_init();
advertising_init();
conn_params_init();
advertising_start();
// Start execution.
printf("\nUART started.\r\n");
NRF_LOG_INFO("Debug logging for UART over RTT started.");
uint16_t length = 0;
while(1)
{
idle_state_handle();
}
}
I noticed that the LED blinks as expected , but only for the time the device is advertising( 180 seconds).
When the device stops advertising due to timeout , my repeated timer also stops and the LED stays off. Why is that happening?
When I connect my smartphone to the device and no timeout occurs, the repeated timer will work continuously just the way I want.
I assume that when advertising timeout occurs, the app timer is disabled somehow.
I tried to fix it by setting the flag APP_TIMER_KEEPS_RTC_ACTIVE to 1, but with no success.
I also tried to read the elapsed_ticks_acquire() but it always returns 0.
How can I use the app timer to create a timer that works independently without it being disabled after advertising time-out or interrupted by BLE in general ?
Thank you for your time.
