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Heng KC Posted
5-Sep-2001 09:32 Toolset
C51 |  89C51 programming Heng KC Hi,
A real silly problem. I am currently learning how to program this guy, ATMEL 89C51. I had a LED on Port 1 pin 0. 4MHz crystal with 30pF caps to ground, resent to ground, grounded the uC, 5v to Vcc. And the my program can't compile.
==========
#include <AT89X51.H>
#include <stdio.h>
int main()
{
int x,led;
sbit led = P1 ^ 0;
while(1)
{ led = 1;
for (x=0;x<10000;x++);
;
led = 0;
for (x=0;x<10000;x++);
}
return(0);
}
/*
..\test.C(7): error C141: syntax error near 'sbit'
Target not created
*/
Someone tell me wats wrong? Do I have to configure the Ports ie. CWR? Like wat I have to do programming a 8255 PPI chip?
Thank you,
hengkc.geo@yahoo.com | | Read-Only Author
Alex Ruiz Posted
6-Sep-2001 08:15 Toolset
C51 | RE: 89C51 programming Alex Ruiz Heng,
Since you already have a led sbit declaration you don't need other variable with the same name. Your sbit declaration shoud be in a global area.
#include <reg51.h>
#include <stdio.h>
sbit led = P1 ^ 0; //compilation time definition,
//it must be in the global area
int main(void)
{
int x;
while(1)
{
led = 1;
for (x=0;x<10000;x++);
led = 0;
for (x=0;x<10000;x++);
}
return(0);
}
This should work... | | Read-Only Author
Heng Kc Posted
6-Sep-2001 22:33 Toolset
C51 | RE: 89C51 programming Heng Kc Hi Alex,
Thank you for your reply. I got the program to complie, but now a another problem. When I try to download into the uC, it prompts me Address out of range.
I've seleceted the "Use on-chip ROM 0x0-0xFFF" option and everything could not complie again.
???
Thank you in advance,
Heng | | Read-Only Author
Alex Ruiz Posted
7-Sep-2001 08:17 Toolset
C51 | RE: 89C51 programming Alex Ruiz Maybe you're using a Demo version... The Demo version will start your code at C:0x4000.:
C:0x0000 024000 LJMP C:4000
C:0x3FFF 00 NOP
C:0x4000 787F MOV R0,#0x7F
...
Starting at 0x4000 your on chip ROM won't fit.
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