Trying to get nrf51822 on Rigado BMD-200 to print to hyperterminal via uart

[eq]

Hello,

I'm trying to do some simple printfs to hyerperterminal as a way to debug my code. I have used the uart example init code but nothing prints:

void init_uart(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_DISABLED, //APP_UART_FLOW_CONTROL_ENABLED,
          false,
          UART_BAUDRATE_BAUDRATE_Baud38400
    };

    APP_UART_FIFO_INIT(&comm_params,
                         UART_RX_BUF_SIZE,
                         UART_TX_BUF_SIZE,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOW,
                         err_code);

    APP_ERROR_CHECK(err_code);

    printf("Hello !!");
}

I have Windows Hyperterminal set to 34800 one stop bit, 8 data bits, no parity. If tried with H/W flow on and off with no luck. I am using COM7 which is the USB port that the JTag is connected to. Any advice on how to get this going?

I have tried PrintF and uart_putstring((const uint8_t *)START_STRING);

with no luck so far.

[Nguyen Hoan Hoang]

Look in libraries/uart for file retarget.c

[eq]

That file uses uart_putstring also which doesn't work for me

[Nguyen Hoan Hoang]

That is what require to reroute stdio over uart.

[eq]

Thanks. I switched to _write from retarget.c and now only the first character is displayed and then it stops.

[Nguyen Hoan Hoang]

You don't call _write. _write is called by printf.