//EPOCH PROJECT 32A - TRANSMITTING DATA USING OUR OWN TRANSFER PROTOCOL
//THIS IS THE TRANSMITTING CODE THAT SHOULD BE LOADED INTO CHIP-A.  WE'RE GOING TO SEND PULSES OVER TO CHIP-B TO BE COUNTED.
//CONNECTIONS:
//CONNECT GPIO#2 ON CHIP-A TO GPIO PIN#3 ON CHIP-B (THE RECEIVER)
#define pulseout 2    // THIS IS OUR OUTPUT LINE WHICH IS DEDICATED TO GPIO#2 ON CHIP-A
int state = 0;        // THIS IS USED IN THE senddat() FUNCTION
int sendval = 0;      // ALSO USED IN THE senddat() FUNCTION

void setup(){
pinMode(pulseout,OUTPUT); // ASSIGN pulseout AS AN OUTPUT
}

void loop(){
sendval = 9;    // PLACE ANY VALUE INTO THE sendval INTEGER. THIS IS THE AMOUNT OF PULSES WE'LL TRANSMIT  
delay(1000);    // WAIT ONE SECOND
senddat();      // CALL THE senddat FUNCITON TO TRANSMIT
}

void senddat()    // THIS FUNCTION TRANSMITS THE NUMBER IN sendval OVER TO THE RECEIVER BY SENDING PULSES 
{
  state = 0;
  while(state == 0){  // DO THE FOLLOWING UNTIL STATE DOES NOT EQUAL 0, OR THE break; COMMAND IS USED.  
    {
      pulse();                // CALL THE pulse() FUNCTION, WHICH LITERALLY JUST TURN THE OUTPUT LINE ON AND OFF ONCE.
      sendval = sendval - 1;  // NOW THAT A PULSE HAS BEEN SENT, DECRREMENT THE VALUE IN sendval BY 1
      if(sendval == 0)        // IF sendval EQUALS 0, THEN THERE ARE NO MORE PULSES TO BE SENT. IF THIS IS THE CASE, FROM THIS ROUTINE.
      {
        state = 1;            // THIS ENDS THE ROUTINE
      }
    }
  }
}


 void pulse()  // SEND A 5ms PULSE TO THE RECEIVER
  {
    digitalWrite(pulseout,HIGH);
    delay(5);
    digitalWrite(pulseout,LOW);
    delay(5);
  }

// NOTES:
// SEE CODE SAMPLE 32B (THE RECEIVER CODE) FOR YOUR CHALLENGES!