Controlling GPIO via UART on BLE

[akshaey]

Hello

I am looking to make a program on nrf52 in which i send various values from nrf UART app on a mobile, and each value controls a LED on a GPIO. For example, sending 1 turns on the LED, 2 turns off, 3 blinks. Can you please provide me of a reference link which can help me in making this program.

Basically on UART BLE program, i want to include something like if the value in UART buffer=1, set gpio pin x= 1.

thanks in advance and for your time and help

[manymany]

For turning LED ON/OFF you can use something like that:

...   
  #define LED1 17
  #define LED2 18

  int main(void)
  {

      nrf_gpio_cfg_output(LED1);
      nrf_gpio_cfg_output(LED2);

      while (true)
      {
         nrf_gpio_pin_clear(LED1); //LED ON
         nrf_gpio_pin_set(LED2);    //LED OFF
         nrf_delay_ms(500);
         nrf_gpio_pin_set(LED1);     //LED ON
         nrf_gpio_pin_clear(LED2);   //LED OFF
         nrf_delay_ms(500);
      }
  }

For blinking LED with BLE UART: use example ...\SDK12.2_full\examples\ble_peripheral\ble_app_uart\

And modify this function:

static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    #define LED1 17
    for (uint32_t i = 0; i < length; i++)
    {
        if (p_data[i]=='1')
        {
           nrf_gpio_cfg_output(LED1);
           nrf_gpio_pin_clear(LED1);
        }
        if (p_data[i]=='0')
        {
           nrf_gpio_cfg_output(LED1);
           nrf_gpio_pin_set(LED1);
        }
        while (app_uart_put(p_data[i]) != NRF_SUCCESS);
    }
    while (app_uart_put('\r') != NRF_SUCCESS);
    while (app_uart_put('\n') != NRF_SUCCESS);
}

Then when you send 1 the LED turn ON and when you send 0 the LED turn OFF

[manymany]

I've just tested the example in my updated answer, it works, then you can rewrite to have something clean. In Android I use nRF UART 2.0 from nordicsemi.