Arduino串行读取和解析HEX

Question

我正在尝试为DMX软件Freestyler创建一个Arduino接口，但由于知道所接收数据的编码而难以解析收到的数据。

下面的图像是我附加到Freestyler的串行监视器，用于查看输入数据，格式非常简单，每个通道3个字节。第一个字节是startOfMessage，第二个字节是通道号，第三个字节是通道值。

串行监视器显示为十六进制和十进制。

为了测试，我正在尝试在正确解析startOfmessage（这是一个常量）时打开一个led。

byte myByte; 
void setup(void){
Serial.begin(9600); // begin serial communication
pinMode(13,OUTPUT);
}

void loop(void) {
if (Serial.available()>0) { // there are bytes in the serial buffer to     read
  while(Serial.available()>0) { // every time a byte is read it is   expunged 
  // from the serial buffer so keep reading the buffer until all the bytes 
  // have been read.
     myByte = Serial.read(); // read in the next byte

  }
  if(myByte == 72){
    digitalWrite(13,HIGH);
  }
  if(myByte == 48){
    digitalWrite(13,HIGH);
  }
  delay(100); // a short delay
  }

 }

有人能让我朝着正确的方向前进吗？

Answer 1

You must detect startOfMesage and with it, read channel and value. So, read byte from serial until you detect '0x48'

byte myByte, channel, value;
bool lstart = false; //Flag for start of message
bool lchannel = false; //Flag for channel detected
void setup(){
    Serial.begin(9600); // begin serial communication
    pinMode(13,OUTPUT);
}

void loop() {
   if (Serial.available()>0) { // there are bytes in the serial buffer to read
      myByte = Serial.read(); // read in the next byte
      if(myByte == 0x48 && !lstart && !lchannel){ //startOfMessage
         lstart = true;
         digitalWrite(13,HIGH);
      } else {
         if(lstart && !lchannel){ //waiting channel
             lstart = false;
             lchannel = true;
             channel = myByte;
         } else {
            if(!lstart && lchannel){ //waiting value
               lchannel = false;
               value = myByte;
            } else {
               //incorrectByte waiting for startOfMesagge or another problem
            }
         }
      }
   }
}

Not very elegant but could work.