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Using input() with a variable

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knobby67
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Using input() with a variable

Posted: Thu Sep 28, 2006 9:41 am

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Hello I’m hoping someone can help me out with this, basically I have a structure define as below

Code:

struct meter_input
{
byte input;
long count;
char status;
};

I then have structure like the below

Code:

STRUCT meter_input _10pCoinInput=
{
PIN_B0,
0,
LO,

};

Where input is used to store the pin to be read with the library function input()

I call the function

ReadStatus(&_10pCoinInput);

The ReadStatus is as follows

Code:

void ReadStatus(struct meter_input *meter)
{

if(meter->status==HIGH)       //is the status high
{
   if(!input(meter->input))    //has the input dropped low
   {
      meter->status=LO;
      meter->count++;
   }
   else
   {
      return;
   }
}
else………………………

However this gives a error
Expression must evaluate to a constant

As far as I’m awear it does? Input is PIN_B0, I’ve tried defining input with a const ie const byte input; but this gives an error can anyone advise?
Thanks

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Thu Sep 28, 2006 10:06 am

This thread has links to the routines: http://www.ccsinfo.com/forum/viewtopic.php?t=27923&highlight=18f+16f

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