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 //
 // Example code for a NEXA transmitter produced by Sonny -11
 // Needs adjustment depending of wich microcontroller choosen.
 //
 
 // Defines for connected processor port
 #define TX_HI PORTx.F2 = 1
 #define TX_LO PORTx.F2 = 0
 #define BUTTON PORTx.F0
 
 unsigned long saved_sender = 123456; // The "remote-control" id
 unsigned short saved_recicpient = 7; // Receiver channel
 unsigned short saved_group = 0;      // no "group" message
 unsigned short saved_action = 1;     // "on" :)
 unsigned short PACKETS = 7;          // Packets to send out
 unsigned short true = 1;
 unsigned short false = 0;
 

void main () {
     //
     // Some setup commands goes here ..
     // ex. ...
     PORTx = 0;    // Define states of processor pins ...
     TRISx = 1;    // Define in (1) or out (0) of processor pins ...
     //
     while( 1 ) {
         if ( BUTTON == 1 ) {
            transmitNEXA(saved_sender, saved_recipient, saved_group, saved_action, PACKETS);
            delay_ms(500);
         }
     }
}


void sendPairNEXA(unsigned short b) {
    // Manchester data is 01 or 10, never 11 or 00
    if(b == 0) {
        sendBitNEXA(true);
        sendBitNEXA(false);
    } else {
        sendBitNEXA(false);
        sendBitNEXA(true);
    }
    return;
}


void sendBitNEXA(unsigned short b) {
    if (b == 1) {
        TX_HI;
        delay_us(320);
        TX_LO;
        delay_us(200);
    } else {
        TX_HI;
        delay_us(320);
        TX_LO;
        delay_us(1210);
    }
    return;
}


void transmitNEXA( unsigned long SenderID, unsigned short RecCh, unsigned short Group, unsigned short Enabled, unsigned short Repeats ){
  //
  // Takes approx. 80mS / packet
  //
  unsigned short i,cnt;
  unsigned long DA;
  unsigned short RCP;
  //
  GIEN = 0;
  //
  //Preamble();            // Send a "Preamble" to wakr the receivers up or just send seweral packets to do the same job ;)
  //
  for (cnt = 0;cnt < Repeats;cnt++) {
      //
      DA = SenderID;
      RCP = RecCh;
      //
      TX_HI;
      delay_us(320);
      TX_LO;
      delay_us(2510);
      //
      for(i=0; i<26;i++) {     // Send bits 0-25 ,Device Address..
        //
         if((DA & 0x02000000)==0x02000000) {
             sendPairNEXA(true);
         } else {
             sendPairNEXA(false);
         }
         DA <<= 1;
      }

      // Send 26th bit - group 1/0
      sendPairNEXA(Group);

      // Send 27th bit - on/off 1/0
      sendPairNEXA(Enabled);

      // last 4 bits - recipient
      //
       for(i=0; i<4;i++) {
         //
         if((RCP & 0x8)==0x8) {
             sendPairNEXA(true);
         } else {
             sendPairNEXA(false);
         }
         RCP <<= 1;
      }
      //
      // Now send "EndOfMessage" pattern ...
      //
      TX_HI;
      delay_us(310);
      TX_LO;
      delay_us(9810);  // put low for at least this time :)
  }
  //
  return;
}