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Define PR2

 
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Karel
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Define PR2
PostPosted: Wed Feb 01, 2006 5:38 am     Reply with quote
Hello all,

i'm working with a 18F452 to produce a variable frequency with PWM1.
I looked up in mplab that the address of PR2 is 0xFCB.
So, i added #define PR2 0xFCB to the header file.

Why is PR2= 25; not working?
Compiler error says:
Expecting LVALUE such as a variable name or * expression

What am i doing wrong?

Thanks.

K
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Wed Feb 01, 2006 6:37 am     Reply with quote
Quote:
Why is PR2= 25; not working?
Because this is invalid C code.

You could have written
Code:
#define PR2 0xFCB
*PR2 = 25;

or
Code:
#byte PR2 = 0xFCB
PR2 = 25;


Instead of creating your own defines it is easier to use the include file with register definitions that Mark posted for the 18F452: http://www.ccsinfo.com/forum/viewtopic.php?t=14755
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