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changing a port bit value in #asm

 
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homfray



Joined: 19 Nov 2003
Posts: 45
Location: Oxford

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changing a port bit value in #asm
PostPosted: Fri Mar 05, 2004 5:50 am     Reply with quote
I am using 18F452

In my main C code I have the folllowing section in asm

Code:

void setup()
{
   #asm
      bsf PORTE, 2
      bsf SSPSTAT, SMP
      bsf SSPCON1, SSPM3
      bsf SSPCON1, SSPEN
      movlw   0x10
      movwf SSPADD
   #endasm
}


As i have never used this before I want to flick on a LED so I know that I have entered this section of code. The problem I get is that I get an error saying

Undefined identifier PORTE

what do I write instead as I am sure I have written this in asm code before

regards

dave Question
mpfj



Joined: 09 Sep 2003
Posts: 95
Location: UK

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PostPosted: Fri Mar 05, 2004 8:08 am     Reply with quote
The .h files do not inclide definitins for PORTx.

So you will have to include the following declaration ...

Code:
#define PORTE 0xF84

... which allows the compiler to know where to look.

You will probably have to do the same for the SSP stuff as well.

Mark
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