The processing of C # to the receiving of serial data

The overall use of Blog Park, although know the pattern, but draw on the other people's writing: Click on the Open link

Personal opinions and ideas:

1. Get enough data information first.

2. Judge the frame head, get the required data information

3. Frame end, execute next judgment

4. Removal of processed data

Done using the caching mechanism. First, by defining a member variable list<byte> buffer = new list<byte> (4096), which is used to hold all the data, in the receiving function, through the buffer. The AddRange () method continuously adds the received data to the buffer and checks the data in the buffer at the same time, if it reaches a certain length and the checksum result is correct (the calibration method is consistent with the sender and receiver), then processing. The specific code is as follows: code

Private list<byte> buffer = new list<byte> (4096);
private void Sp_datareceived (Objectsender, EventArgs e)//SP is a serial control
{
   int n = sp. Bytestoread;
   byte[] buf = new Byte[n];
   Sp. Read (buf, 0, N);

   1. Cache data
   buffer. AddRange (BUF);
  2. Integrity judgment while
  (buffer). Count >= 4)//contains at least frame head (2 bytes), Length (1 bytes), checksum bit (1 bytes), varies according to design
  {
    //2.1 lookup header
    if (buffer[0] = = 0x01)//Transmit data has frame headers, Used to determine
    {
      int len = buffer[2];
      if (buffer). Count < Len + 4)//data area has not received full
      {break
	;
      }
      Get the complete data and copy it into the receivebytes to check the
      buffer. CopyTo (0, receivebytes, 0, Len + 4);
      byte valid; Start checksum
      Valid  = this. JY (receivebytes);
      if (Jiaoyan!= receivebytes[len+3])//checksum fails, the last byte is a checksum bit
     {
	buffer. RemoveRange (0, Len + 4);
	MessageBox.Show ("The packet is incorrect.) ");
	Continue;
     }
     Buffer. RemoveRange (0, Len + 4);
     Execute other code to process the data.
   }
   If else//frame header is not correct, remember to clear
   {
     buffer. RemoveAt (0);
    }}}