RE: UART and USB MSC not working together

anusha — Mon, 03 Feb 2020 13:36:45 GMT

I got it working. In app_uart_fifo.c in function app_uart_init(), there is a check to turn on receiver if Rx pin is connected.

// Turn on receiver if RX pin is connected
    if (p_comm_params->rx_pin_no != UART_PIN_DISCONNECTED)
    {
        return nrf_drv_uart_rx(&app_uart_inst, rx_buffer,1);
    }
    else
    {
        return NRF_SUCCESS;
    }

Once I connected the Rx pin, the SD card contents showed up on the PC.

Apologies for the false alarm.