Multiple serial port configuration

Conventional projects only support one serial port by default. If you want to use dual serial ports or even multiple serial ports, please download DoubleUartDemo sample. In this example, part of the serial port code is modified in the conventional project to support multiple serial ports.

Change

The changes are described below.

• Some codes of uart have been modified, so the serial port configuration in the project properties is invalid.

• Please refer to the init() function in the jni/uart/UartContext.cpp file to modify the serial port number and baud rate.

  void UartContext::init() {
      uart0 = new UartContext(UART_TTYS0);
      uart0->openUart("/dev/ttyS0", B9600);
  
      uart1 = new UartContext(UART_TTYS1);
      uart1->openUart("/dev/ttyS1", B9600);
  }
  

• Send data to the designated serial port

      unsigned char buf[2] = {1, 1};
      sendProtocolTo(UART_TTYS1, 1, buf, 2); //Send to TTYS1 serial port
  
      unsigned char buf[2] = {0};
      sendProtocolTo(UART_TTYS0, 1, buf, 2);//Send to TTYS0 serial port
  

• The method of receiving serial port data is the same as that of regular projects
  If you need to distinguish which serial port the data comes from, it is recommended to add a field to the SProtocolData structure to identify which serial port the frame comes from.

  Change uart/ProtocolData.h

  typedef struct {
        BYTE power;
        int uart_from; //From which serial port
  } SProtocolData;
  

  Change uart/ProtocolParser.cpp

    /**
     * Analyze each frame of data
     */
    static void procParse(int uart, const BYTE *pData, UINT len) {
        // CmdID
        switch (MAKEWORD(pData[3], pData[2])) {
        case CMDID_POWER:
            sProtocolData.power = pData[5];
            break;
        }
  
        sProtocolData.uart_from = uart; //Identify which serial port the frame comes from
        // Notify protocol data update
        notifyProtocolDataUpdate(sProtocolData);
    }
  

  Then in Logic.cc, you can use the uart_from field to determine which serial port the data comes from.

  static void onProtocolDataUpdate(const SProtocolData &data) {
      LOGD("onProtocol %d", data.uart_from);
  
      char buf[128] = {0};
      snprintf(buf, sizeof(buf), "Receive serial port %d data", data.uart_from);
      mTextview1Ptr->setText(buf);
  }
  

  Sample code

  For the complete code, see the DoubleUartDemo project in Sample Code