Controlling GPIO via UART on BLE

Question

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 · Accepted Answer

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('') != NRF_SUCCESS);
 while (app_uart_put('
') != NRF_SUCCESS);
}
 
 Then when you send 1 the LED turn ON and when you send 0 the LED turn OFF

Controlling GPIO via UART on BLE

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