sub Routine HELP

[ELAB-raph]

Hi,

I am building a controller that works in a bus configuration, here for I am making new subRoutine.

My question is how can I make a function like UART1_Data_Ready(), that I can use the if function directly on the function whitout using an extra char/int.

kind regards

Raphael Baars
ELAB electronic systems
The netherlands

[braus]

hello ELAB-raph.
You can check the state of RCIF flag bit which sets when a new byte was received. You can develop a polled function to take care of this bit or you can write an interrupt sub routine to achieve the same results.

[ELAB-raph]

tnx for te reply,

But I dont no how to make a function like that. :$

what I want is to do :

void function(???) {
?????? how do I do this
}

if (function() == 1) {
...
}

Best Regards

Raphael Baars
ELAB

[braus]

polled form...

Code: Select all

   .
   .
   .
   if(PIR1.RCIF)   //with this conditional you are checking when a byte was received in RCREG register
      {            //this code could be in main program or in a function definition.
      the code to proccess the data is here
      PIR1.RCIF
      }
   .
   .
   .

interrupted form...

Code: Select all

void interrupt(){

   if(PIR1.RCIF){
   proccessing the data here
   PIR1.RCIF=0;
   }
}

[drdoug]

A couple observations.
As was pointed out to me not too long ago, the RCIF bit (in most if not all cases) is not writeable. It is however cleared when you read RCREG.

Also, ELAB-raph asked about

what I want is to do :

Code: Select all

void function(???) {
?????? how do I do this
}

if (function() == 1) {
...
}

in this case, you want a returning value not a void. (pseudo code)

Code: Select all

unsigned char NerdFunction(void) {
    if(cool ==1)
      return 0;
    else if (lame == 1)
      return 1;
    }

...
// Now you can use something  like
if(!NerdFunction())
  KissAGirl();
 

and if you want to pass a value into the function

Code: Select all

#define Cool 0
#define lame 1

unsigned char NerdFunction(unsigned char HairStyle) {
    if(HairStyle == Cool)
      return 0;
    else if (HairStyle == lame)
      return 1;
    }

...
// Now you can use something  like
if(!NerdFunction(MyHair))
  KissAGirl();
 

Hope it helps.

[ELAB-raph]

tnx man,

This was exectly what I was looking for.

I wel try it out soon.

Raphael Baars
ELAB