I want to send data from nrf51822 through UART TX to esp8266.

[ej_junior]

Hello, 

I am trying to send data from nrf51822 through UART TX to esp8266. I've gone through the app_uart examples and I can recieve data through RX but having difficulty sending data through TX.

[Jared]

Hi,

Do you measure any signal on the TX pin?

best regards

Jared 

[ej_junior]

This is my code so far. 
I changed the TX pin from 9 to 26. Since not working on 9, but still not receiving any values on esp8266 arduino serial port 

// NRF_LOG_BACKEND_SERIAL_UART_TX_PIN 26 
// NRF_LOG_BACKEND_SERIAL_UART_RX_PIN 11


// Sending data through TX
static void uart_loopback_test()
{
 
uint32_t err_code;
    // Start sending one byte and see if you get the same
    for (uint32_t i = 0; i < length; i++)
    { 
			 while (app_uart_put(data[i]) != NRF_SUCCESS);
    }
		 nrf_delay_ms(10); 

    return;
}


// UART init
static void uart_init(void)
{
    uint32_t                     err_code;
    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_ENABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud9600
    };

    APP_UART_FIFO_INIT( &comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_event_handle,
                     //  APP_IRQ_PRIORITY_LOWEST,
						APP_IRQ_PRIORITY_HIGHEST,
                       err_code);
    APP_ERROR_CHECK(err_code);
}