Hi,
> #include <pic16f877.h>
> #define SET(reg,bit) (reg) |= (1<<(bit))
> #define CLR(reg,bit) (reg) &= ~(1<<(bit))
>
> #define LED1 PORTA,0
> #define LED2 PORTA,2
>
> void main() {
> SET(LED1);
> }
The problem is that LED1 is expanded too late, you need to insert a
level of indirection:
/* for demonstration only, #include <pic14regs.h> in real life */
unsigned PORTA;
/* requires two separate arguments */
#define SET2(reg,bit) (reg) |= (1 << (bit))
#define CLR2(reg,bit) (reg) &= ~(1 << (bit))
/* requires a single argument that expands to two */
#define SET(arg) SET2(arg)
#define CLR(arg) CLR2(arg)
/* macros to address single bits in a register */
#define LED1 PORTA, 0
#define LED2 PORTA, 2
void main(void) {
SET(LED1);
CLR(LED2);
SET2(PORTA, 0);
}
> I'm using SDCC 2.7.4. Can anybody help me?
Actually this is a GNU C Preprocessor problem, we only use it ;-)
Regards,
Raphael
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