Hi Donald,
The keyword 'sbit' is used to define special function bits, much like
the keyword 'sfr' for the special function registers. The good news is
that most of the SFRs in 8051 are already defined in <8051.h> Thus to
set the 4th bit of PORT-2 to 0, use the following code:
#include <8051.h>
void main (void)
{
P2_3 = 0; // P2_0 is the first bit of port 2
}
This is not standard C. Thus Keil and SDCC may follow different conventions.
Krish
2011/3/22 duck donal <tangtao87657...@gmail.com>:
> Hi All,
> I'm a newbie for sdcc.
> A few days ago, I was in use of SDCC, ran into a problem.
>
> Program (bee.c) is very simple, as follows:
> #include<reg51.h>
> #include<stdio.h>
> sbit P10=P1^0;
> sbit P17=P1^7;
> int main(void)
> {
> unsigned char j;
> unsigned int i;
> while(1){
> P17=1;
> while(P17==0)
> {
> for(i=1;i<=500;i++)
> {
> P10=~P10;
> for(j=0;j<=50;j++);
> }
> for(i=1;i<=250;i++)
> {
> P10=~P10;
> for(j=0;j<=100;j++);
> }
> }
> }
> return 0;
> }
> My compiler option was sdcc -mmcs51 bee.c
> But SDCC gave me such an error message : bee.c:3:error 2:Initializer
> element is not constant
>
> bee.c:4:error 2:Initializer element is not constant
> It means the expression: sbit P10=P1^0 was wrong.
> I used keil C running the program,it compiled successfully,no
> errors,no warnings.
> Later,I got other programs to compile with SDCC.I found that where
> there is sbit instructions, there is error 2:Initializer element is not
> constant
> But keil C still can compile successfully.
> So,what is the solutions?To modify the program?How to do it? Or modify
> the sdcc?
> thanks！
> Donald
>
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