Re: [avr-gcc-list] inline assembler problem

[Matte]

Hi 

Since some of you wanted to view the whole testprogram in order to help
me track the error I've struggeling with, I post it here. The compiler
I'm using is still the avr-gcc-3.3.1. 
The functions in the code below I did implement in order to have some
simple functions to learn from. 


#include <inttypes.h>

#define PORT_A 0x1B
#define DDR_A 0x1A
#define PIN_A 0x19

uint8_t read(const uint8_t adr) {
  uint8_t p;
  asm volatile ("in %0, %1" : "=r" (p) : "I" (adr));
  return p;
}

uint8_t fastSBI(const uint8_t port, const uint8_t bit) {
  asm volatile("sbi %0, %1" : : "I" (port), "I" (bit));
}

int main(void) {
  uint8_t port_a = PORT_A;
  uint8_t ddr_a = DDR_A;
  uint8_t pin = 3;
  uint8_t data;
 
  data = read(port_a);
  fastSBI(ddr_a, pin);
  
  return 0;
}

When trying to compile this I get the following errors: 
inlasm.c: In function `read':
inlasm.c:11: warning: asm operand 1 probably doesn't match constraints
inlasm.c:11: error: impossible constraint in `asm'
inlasm.c: In function `fastSBI':
inlasm.c:17: warning: asm operand 0 probably doesn't match constraints
inlasm.c:17: warning: asm operand 1 probably doesn't match constraints

Thanks all of you who have tried to help out.

Best Regards
Mattias



> This looks right to me.  Show us your *entire* test program.
> 
> (I'll bet you are using something like "PORTB" when using your macro 
> "read()".  If so, you have a different problem! :-)
> 
> Best regards,
> 
> Bruce




-- 
Mattias

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