Em 27/8/2012 13:48, David escreveu:
> On 27/08/2012 17:43, Isaac Marino Bavaresco wrote:
>> If your "libraries" are indeed ".lib" files, that approach won't work,
>> because the library's code was compiled with a fixed value for the
>> constant macros.
> They are not .lib files, hence my use of quotes.
>
> David


If you don't need too much speed, you could use a pin abstraction layer.
I developed one for a PLC-like application where the pins are operated
under control of a remote client sending commands.

This is part of file "IO.h":

void                     IOInit            ( void );
unsigned char    IOGetCount        ( void );
signed char        IOReadValue        ( unsigned char IONumber );
signed char        IOSetDirection    ( unsigned char IONumber, unsigned
char Direction );
signed char        IOSetValue        ( unsigned char IONumber, unsigned
char Value );
signed char        IOToggle        ( unsigned char IONumber );
signed char        IOClear            ( unsigned char IONumber );
signed char        IOSet            ( unsigned char IONumber );


And this is how the pins are associated with numbers:

const rom Pin_t    IOMap[]    =3D
    {
        /* Simple digital I/O pins */

        P(D,0), P(D,1), P(D,2), P(H,0), P(H,1), P(H,2), P(H,3), P(J,4),
        P(J,5), P(B,4), P(B,5), P(C,1), P(A,4), P(C,0),

        /* Analog-capable I/O pins */

        P(A,2), P(A,3), P(A,5), P(F,1), P(F,2), P(F,3), P(F,4), P(F,5),
        P(F,6), P(H,4), P(H,5), P(H,6), P(H,7),

        /* PWM capable I/O pins */

        P(C,2), P(E,6), P(E,5), P(G,4), P(G,0), P(E,4), P(E,3), P(G,3),
        P(E,7), P(E,2), P(E,1), P(E,0),

        /* Communication capable I/O pins */

        P(C,6), P(C,7), P(G,1), P(G,2), P(C,3), P(C,4), P(C,5), P(F,7),
        P(B,0), P(B,1), P(B,2), P(B,3)
    };


Each pin-manipulating function takes around 30 instruction cycles in
assembly. First I wrote a C version for reference.
This was developed for a PIC18F87J60, by the way.


Best regards,

Isaac

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