Hi
I was trying to compile a small program for an 8051 variant (a test version
of my large one) and I get strange results:
#include "P89c66x.h"
void usleep(unsigned char j)
{
// 1 = 3.12us
unsigned char i;
for ( i=0;i<=j;i++);
}
void main()
{
while(1) {
P1=0xFE;
usleep(100);
P1=0xFF;
usleep(100);
}
}
This program blinks pin P1_0. If I compile it with the small memory model, the
usleep function works perfectly but it does not if I use large memory model.
Then the sleeping time is independent of the input number.
The small sleep function is:
_usleep:
ar2 = 0x02
ar3 = 0x03
ar4 = 0x04
ar5 = 0x05
ar6 = 0x06
ar7 = 0x07
ar0 = 0x00
ar1 = 0x01
mov r2,dpl
; test_array.c:9: for ( i=0;i<=j;i++);
mov r3,#0x00
00101$:
clr c
mov a,r2
subb a,r3
jc 00105$
inc r3
sjmp 00101$
00105$:
ret
The large function is the following:
_usleep:
ar2 = 0x02
ar3 = 0x03
ar4 = 0x04
ar5 = 0x05
ar6 = 0x06
ar7 = 0x07
ar0 = 0x00
ar1 = 0x01
mov a,dpl
mov dptr,#_usleep_j_1_1
movx @dptr,a
; test_array.c:9: for ( i=0;i<=j;i++);
mov dptr,#_usleep_j_1_1
movx a,@dptr
mov r2,a
mov r3,#0x00
00101$:
clr c
mov a,r2
subb a,r3
jc 00105$
inc r3
sjmp 00101$
00105$:
ret
I don't see anything in the code that should not work.
Thanks
Gudjon
Ps. I will read through the P89c66x.h file and then contribute it. Thanks for
the nice software :)
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