Hello,

I took your program and tried to compile with SDCC. It generates the following error.

Regards,

Charles Bannister

SDCC : mcs51/gbz80/z80/avr/ds390/pic16/pic14/TININative/xa51/ds400/hc08 2.5.4 #1174 (Nov 26 2005) (MINGW32)

Compiling...
C:/SDCCtest/PAPAS/PAPAS.C(33) : error 16: variable 'i' must be static to have storage class in reentrant function
-:0: error 103: code not generated for 'init_timer' due to previous errors
C:/SDCCtest/PAPAS/PAPAS.C(41) : error 103: code not generated for 'initial' due to previous errors
-:0: error 103: code not generated for 'main' due to previous errors

Compile error! Output not generated.

#include <at89c51ed2.h> 
#include <stdio.h> 
void initial(void); 
void init_timer (void) interrupt 3; 

void init_timer (void) interrupt 3 
{ 
	unsigned char idata i;      // Something wrong here
	i++; 
	while(i==20){ 
	P1=~P1; 
	i=0; 
	}
} 
void initial(void)
{ 
	TMOD=0x10; 
	TL1=0xAF; 
	TH1=0x3C; 
	IE=0x88; 
	TR1=1; 
	P1=0x00; 
} 

void main(void)
{ 
	initial(); 
	while(1){} 
}