Hello All,

I have been writing assembly programs for the 8051 for a couple of years, now I have decided to use C.

My following C code is not working...

#include <AT89X52.H>
#include <intrins.h>
void LongDelay();

void main(void)
{
while(1)
{
P1 =0xaa;
P0 =0xaa;
LongDelay();
P1 =0x55;
P0 =0x55;
LongDelay();
}
}

void LongDelay()
{
unsigned long int a;
for(a=0;a<0xffff;a++)
{
_nop_();
}
_nop_();
}


To cross check my harware, i wrote the following simple code using assembly language...its working


org 0000h
mov p1,#0xaa;
mov p0,#0xaa;
lcall l_delay

mov p1,#0x55;
mov p0,#0x55;
lcall l_delay
ljmp 0000


L_DELAY:
MOV R7,#0AH ;100 MILLISECONDS * 10
LLL: LCALL DLAYms ;1 SECOND
DJNZ R7,LLL
RET

end

Now I am sure that there is no problem in the Hardware.

The C code works fine in the Simulator...I am using AT89C52.

Now I am working on a Graphical LCD and I do feel that using C the project can be completed much faster.

Is it a must that I have to use STARTUP.A51 if I am using C.

Regards
Raj Shetgar