Printf for SDK 8.1.0 and nrf51 DK (PCA10028)

[gaminn]

Can you please provide any information how to implement printf debug output for nrf51 DK (PCA10028) using SDK 8.0.1 and Keil?

[gaminn]

In nrf51 DK user guide section 4.2 Virtual COM port, there is a note: The terminal used must send a DTR signal in order to configure the UART Interface MCU pins. This might be my problem, but I don't have a clue what it means to send a DTR signal.

[gaminn]

I get it. I added app_uart module from Keil packages to my project, then used

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_Baud38400
      };

    APP_UART_FIFO_INIT(&comm_params,
                         256,
                         256,
                         uart_error_handle,
                         APP_IRQ_PRIORITY_LOW,
                         err_code);

In my terminal I checked DTR checkbox to assert DTR signal and I can now use printf.

[jithin m das]

For debugging you can use the RTT Viewer. This works perfectly Here is the link for setting RTT Viewer on your project. devzone.nordicsemi.com/.../