I want to know how to make LED waves using app_timer.

[schosdas]

Hello

I'm working on sdk v17.
I want the LED to be printed out like a wave when I receive certain data from the app. (5 Times)

It is simple to use 'delay' and 'for' as the code below. But I can't do anything else during the delay. (I must be able to output sensor values, send and receive apps and data, etc.)

static void Left_move()
{
  printf("Left MOVE!\n");

  for(int i=0; i<5; i++) //5Times
  {
    nrf_gpio_pin_clear(BAT_LED_1); //LED off
    nrf_gpio_pin_clear(BAT_LED_2);
    nrf_gpio_pin_clear(BAT_LED_3);

    for(int pin=21; pin<25; pin++) //BAT_LED_1,2,3 (pin 22(?),23,24)
    {
      nrf_gpio_pin_set(pin); //led on
      nrf_delay_ms(500);
    }
}


static void nus_data_handler(ble_nus_evt_t * p_evt) //send to app
{
    uint8_t string_buffer[BLE_NUS_MAX_DATA_LEN+1];

    if (p_evt->type == BLE_NUS_EVT_RX_DATA)
    {
        memcpy(string_buffer, p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);
        string_buffer[p_evt->params.rx_data.length] = 0;
 
        //Test Left/Right LED move
        if(strcmp("1", string_buffer) == 0)  //Left
        {
           //NRF_LOG_INFO("Left LED Moning");
           Left_move();
        } 
    }
}

Like this code, how do I use the app_timer to make the LEDs work in sequence at half a second intervals?

Is there anything to refer to?

Thank you in advance.

[Eugene Yu]

Hi schosdas,

You can take a look at the HRS Example in SDK.

Many projects of SDK have already implemented the app timer.

and app timer library guidance also helpful for your implementation.

[schosdas]

It was helpful. Thank you!