C#上的串口,读取直到字节序列

时间:2017-03-03 00:46:32

标签: c# arduino serial-port arduino-due

我有来自COM端口的数据流。该流由30个字节组成。前26个字节是信息,后四个是0xFFF的集合。例如,一组数组是[0xFF,0x5A,0x44,0x15,...,0x5F,0xFF,0xFF,0xFF,0xFF]。在前26个字节中,不可能得到类似的序列 因此,我没有在C#中找到任何方法来“直读”。 我用来读取串行数据的C#代码是:

    public static int count;
    public static void Main()
    {
        SerialPort mySerialPort = new SerialPort("COM8");

        mySerialPort.BaudRate = 250000;
        mySerialPort.Parity = Parity.None;
        mySerialPort.StopBits = StopBits.One;
        mySerialPort.DataBits = 8;

        mySerialPort.Handshake = Handshake.None;
        mySerialPort.DtrEnable = true;
        mySerialPort.RtsEnable = true;
        mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

        mySerialPort.Open();

        count = 0;

        Console.WriteLine("Press any key to continue...");
        Console.WriteLine();

        Console.ReadKey();
        mySerialPort.Close();
    }


    private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting();
        count++;
    }

还有另一种方法可以获得26个有趣字节的List<>吗?考虑到数据在Arduino上,我可以编辑Arduino代码,我的Arduino每秒发送大约800字节的数据集。如果你感兴趣的话,Arduino代码是(此时在Arduino Due下运行):

#define MAX_ADC_RESOLUTION 12 

int val;
void setup() {


 Serial.begin(250000);

 analogReadResolution(MAX_ADC_RESOLUTION); //

  adc_init(ADC, SystemCoreClock, ADC_FREQ_MAX*2, 4); //~220000 samples per second, A/D readings OK

val = 0;


}


void loop() {  

 int start = millis();
 int num_samples = 0; //This identify the sample frequency

 while( millis() - start < 1000 )
 {


  for(int channel=0;channel<12;channel++){ //loop for each analog (0-11)

    val = analogRead(channel);
    val++;
    Serial.write((unsigned char)((val & 0xFF00) >> 8));
    Serial.write(((unsigned char)(val & 0x00FF)));    
  }
  Serial.write((unsigned char)((num_samples & 0xFF00) >> 8));
  Serial.write(((unsigned char)(num_samples & 0x00FF)));  
  Serial.write(0xFF);
  Serial.write(0xFF);
  Serial.write(0xFF);
  Serial.write(0xFF);

  num_samples++;
 }


}

编辑以便更好地解释我的问题:

如果我设置一个简单的缓冲读取长度,我会得到一部分传入流。因此,结束控制字节可以放在字节数组中的任何位置(例如,我通常接收0x44,0x53,...,0xFF,0xFF,0xFF,0xFF,..,0x55​​)。另外,假设接收一个如下:0x22,...,0x00,0xFF,0xFF,0xFF,0xFF,0xFF。这是可能的,我的软件将削减最后一个字节。

1 个答案:

答案 0 :(得分:1)

为什么不使用Read有点像这样:

byte[] buffer = new byte[30];
sp.Read(buffer, 0, 30);

通过这种方式,您可以获得字节数组,并且可以测试您需要/不需要的值。