primary-expression before ?

Forum 2005-2010 (read only) Software Syntax & Programs
1

What is this error that is annoying me?

This has to be something dumb.

#define _txPin = 3;
#define _rxPin = 2;


 
void setup() 
{ 
  
  pinMode(13, OUTPUT);
  Serial.begin(57600);
  ECUwrite(0x55);
  delay(10);
  }
  


void loop(){
  while(1){
  ;
  }
}


void ECUwrite(byte b){

  // Write the start bit
  digitalWrite(_txPin, LOW);
}

Why
In function 'void ECUwrite(byte)':
error: expected primary-expression before '=' token

2 
#define _txPin = 3;
#define _rxPin = 2;

should be

#define _txPin  3
#define _rxPin  2
3

doh.

4

Or...

const byte _txPin = 3;
const byte _rxPin = 2;

http://www.arduino.cc/en/Reference/Const