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undefined identifier error

 
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deltatech



Joined: 22 Apr 2006
Posts: 87

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undefined identifier error
PostPosted: Tue May 02, 2006 7:36 am     Reply with quote
Hi I have tried to comiple this code i got this from a PIC CCS text book
but i get an error RA0_ANALOG as an undefined identifier . But if use the PIC wizard I get this code

setup_adc_ports(sAN0|VSS_VDD);

and this comiles fine . is this the same code writen differently or should the other code compile ?.

this also works setup_adc_ports(ALL_ANALOG);

but this doesnt setup_adc_ports(RA0_ANALOG);

Code:
#include <16F917.h>

#use delay(clock=4000000)

#fuses HS,NOWDT

#define  cutoff   255//128      //2.8 volts
#define  neutral_zone   25      //0.5 volts
#use delay(clock=4000000)

void main()
{

int reading;
  setup_adc_ports(RA0_ANALOG);
   setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(0);

      while(TRUE)

      {


         reading=read_adc();

printf( reading);

//            if(reading<(cutoff-neutral_zone/2))
  //            output_high(PIN_D7);
    //        else if (reading>(cutoff+neutral_zone/2))
      //        output_high(PIN_D6);// light_one_led(RLED);
           // else
             //  light_one_led(YLED);
      }

}
dyeatman



Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK

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PostPosted: Tue May 02, 2006 8:07 am     Reply with quote
Options change from chip to chip and for different versions of the compiler. The available options are normally found in the device header file (in this case the 16F917.H file):

// Constants used in SETUP_ADC_PORTS() are:
#define sAN0 1 //| A0
#define sAN1 2 //| A1
#define sAN2 4 //| A2
#define sAN3 8 //| A3
#define sAN4 16 //| A5
#define NO_ANALOGS 0 // None
#define ALL_ANALOG 31 // A0 A1 A2 A3 A5
Ttelmah
Guest
PostPosted: Tue May 02, 2006 8:56 am     Reply with quote
The 'key' difference, is that most (older) chips, only allow a limited number of combinations of analog inputs. On these the 'minimum' setup, with just RA0 as analog, is normally called 'RA0_ANALOG'. However latter chips (of which yours is one), allow individual analog bits to be selected, and on these, instead of having separate defines for all possible combinations, the bits are specified so that they can be 'ored' together.
This also became 'necessary' on some chips which now have so many analog inputs, and configuration options, that several hundred defines would be needed to cover them the 'old way'.
If you require reverse compatibility in this, you could just add:
#define RA0_ANALOG sAN0|VSS_VDD
and then the old definition would be 'emulated'.
As another poster has said, look at the processor's '.h' file to see the definitions for your chip.

Best Wishes
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