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Serial communication request command

Discussion in 'C' started by ajit.nayak87, May 20, 2016.

  1. ajit.nayak87

    ajit.nayak87 New Member

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    I have written code as below.I am using arduino Uno board

    I have made it work with 2 things

    1) send request from PC and get response request<SMCB1,1>

    2)Send request from PC of specified length<SMCB1,1,100> and get the specified response

    Pending

    3) Send request from PC <SMCB1,1,delaytime,ON> or <<SMCB1,1,delaytime,OFF> This function has to override request. Is timer is on get data continuously for specified delaytime and if timer is off get back to normal


    Code:
    
    #include <avr/wdt.h>
    String Old_string;
    String New_String;
    String Received_String;
    const byte numChars = 32;
    char receivedChars[numChars];
    char tempChars[numChars];        // temporary array for use when parsing
    String txtMsg = "";
    // variables to hold the parsed data
    char messageFromPC[numChars] = {
      0};
    int integerFromPC = 0;
    float floatFromPC = 0.0;
    static int Length_String=0;
    static int Start_Stop=0;
    
    boolean newData = false;
    
    
    void showParsedData() 
    {
    
      New_String=New_String+"SMCB1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"1"+","+"4000";
      String firstString = Received_String.substring(0,14);
      String SecondString=New_String.substring(0,7);
      if ((firstString==SecondString)&&Length_String==0)
      {
        Serial.println(New_String);
      }
      else
      {
        //Serial.println("wrong command send");
      }
      if(Length_String>8 && (firstString==SecondString))
      {
        Serial.println(New_String.substring(0,Length_String));
      }
      Received_String="";
      New_String="";
    }
    
    
    void parseData() 
    {     
      char * strtokIndx; // this is used by strtok() as an index
      strtokIndx = strtok(tempChars,",");      // get the first part - the string
      strcpy(messageFromPC, strtokIndx); // copy it to messageFromPC
      strtokIndx = strtok(NULL, ","); // this continues where the previous call left off
      integerFromPC = atoi(strtokIndx);     // convert this part to an integer
      strtokIndx = strtok(NULL, ","); // this continues where the previous call left off
      Length_String = atoi(strtokIndx);     // convert this part to an integer
      strtokIndx = strtok(NULL, ","); // this continues where the previous call left off
      Start_Stop = atoi(strtokIndx);     // convert this part to an integer
      Received_String=Received_String+messageFromPC+","+integerFromPC;
    }
    
    void recvWithStartEndMarkers() {
      static boolean recvInProgress = false;
      static byte ndx = 0;
      char startMarker = '<';
      char endMarker = '>';
      char rc;
    
      while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();
    
        if (recvInProgress == true) {
          if (rc != endMarker) {
            receivedChars[ndx] = rc;
            ndx++;
            if (ndx >= numChars) {
              ndx = numChars - 1;
            }
          }
          else {
            receivedChars[ndx] = '\0'; // terminate the string
            recvInProgress = false;
            ndx = 0;
            newData = true;
          }
        }
    
        else if (rc == startMarker) {
          recvInProgress = true;
    
        }
      }
    
    }
    
    
    
    void setup()
    {
      wdt_enable(WDTO_8S);
      Serial.begin(57600);
      Serial.println("Format1: <SMCB1,1>");
      Serial.println("Format1: <SMCB1,1,Length>");
      Serial.println("Format1: <SMCB1,1,Timer,On_OFF>");
    }
    
    void loop() {
      wdt_reset();
      recvWithStartEndMarkers() ;
      if (newData == true)
      {
        strcpy(tempChars, receivedChars);
        parseData();
        showParsedData();
        newData = false;
      }
    
    
    }
    
    
     
  2. senthil_a4nlabs

    senthil_a4nlabs New Member

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    In microprocessor 8086 used for serial communication..
     

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