any one here who have used PIC C (ccs pic c compiler pcwdh) for pic programming ?
i want to access SFR registers like PR2 and TMR2 but dont know how to access these. kindly help

 

Normally you would have an "include" file with an extension of ".h" containing the definitions of all of the file registers. These definitions would look like"

#define TMR2 0x87

for example. There should be an include file for each PIC variant supported by the compiler. If you can locate such a file and include it with your source code you can write statements like

TMR2 = 0x9C ;

 

If you can locate such a file and include it with your source code you can write statements like

TMR2 = 0x9C ;

I believe you meant to make that a define statement. As written it is a simple assignment where the lvalue may not be determined.

 

No I meant it the way it was written. What I did not specify was the content of the include file which would have a definition which allowed the string TMR2 to resolve into an lvalue. I just don't have a handy example at the moment.

 

The #define example you wrote is pretty close, though typically all working registers are defined as "volatile".

Just let it lie there least we start another useless thread concerning the necessity of that keyword.

 

Only true Alchemists download MPLABX and use project templates.
You actually dont need to do a thing, and get all the files created.

 

OK, I went and found an actual header file for a PIC

...
#define TMR2_ADDR 0x0011
...
extern __sfr __at (TMR2_ADDR) TMR2;

It was the second line in the example above that I could not remember the form of. Of course __sfr and __at have compiler specific meanings as you might expect.
The file is located at:
http://ee.hawaii.edu/~sasaki/EE361/Fall12/Lab/pic16f628.txt

 

thank u all for ur valuable suggestions, the problem was resolved. we can generate a file for all PIC varients that contains defination of all SFR's and can access all SFR's.