RE: Cannot read to terminal from UART

JudePinto — Fri, 30 Oct 2015 23:56:17 GMT

Thank you! That worked perfectly once i powercycled my board

RE: Cannot read to terminal from UART

Stefan Birnir Sverrisson — Thu, 29 Oct 2015 08:16:05 GMT

When I try it I have to input 20 characters in RealTerm in order to have the data sent to the Android phone. That is because the ble_app_uart application will first send the BLE packet when 20 bytes are received on the UART, specified by the BLE_NUS_MAX_DATA_LEN constant. This is done in line 400 in main.c in the uart_event_handle function. I can set a breakpoint there and it is hit whenever I input a character in RealTerm.

If I however modify the code to make the data packet be sent whenever a "carrier return" is received, then a packet is sent whenever "Enter" is pressed in RealTerm, i.e. input "abc" then press "enter" and then the three characters are seen in the nRF UART v2.0 app.

The carrier return has hex code 0x0D but can be detected with \r also in C. So the code is now:

    case APP_UART_DATA_READY:
        UNUSED_VARIABLE(app_uart_get(&data_array[index]));
        index++;

        if ((data_array[index - 1] == '\r') || (index >= (BLE_NUS_MAX_DATA_LEN)))
        {
            err_code = ble_nus_string_send(&m_nus, data_array, index);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            
            index = 0;
        }
        break;