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Reading STATUS on a 18F422

 
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pfournier



Joined: 30 Sep 2003
Posts: 89

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Reading STATUS on a 18F422
PostPosted: Thu May 20, 2004 12:38 pm     Reply with quote

It seems I can't read the STATUS (ALU) register in C.

Seems I have to use something like this:

#asm
movff status,status_temp
#endasm

I can then use status_temp.

Trying to read STATUS in a C staement just gets me 0x07.

Is this correct? or am I doing something wrong.

-Pete
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-Pete
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu May 20, 2004 12:48 pm     Reply with quote

Quote:
It seems I can't read the STATUS (ALU) register in C.


Post your C source code. Also post the line where you
declare the address of the Status register.
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Thu May 20, 2004 1:39 pm     Reply with quote

Maybe I'm stupid, but I can't find a 18F422 on Microchip's site. Would you happen to mean 18F4220?
pfournier



Joined: 30 Sep 2003
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PostPosted: Thu May 20, 2004 3:44 pm     Reply with quote

OOPS meant 18f452, (never said I could type)

my definition, all the registers are done this way

char status;
#LOCATE status= 0xfd8


I would do something like this:

printf("%x", status); //or some other operation

Instead I do this:

int8 status_temp1;

#asm
movff status, status_temp1
#endasm
printf("%x", status_temp1); //or some other operation

Thanks.
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-Pete
rnielsen



Joined: 23 Sep 2003
Posts: 852
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PostPosted: Thu May 20, 2004 4:56 pm     Reply with quote

I've had success in doing it this way:

#byte STATUS = 0xFD8 // global declaration

printf("%X", STATUS); // inside main()

Ronald
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