On May 25, 2011, at 1:36 PM, KPL wrote:
> Hi,
>
> I have tried a little bit of programming in sdcc for pic before, but
> it never went too far, so treat me as a complete beginner. I have
> studied C programming many years ago, but almost never used it, so
> everything except the very general stuff is forgotten long time ago.
>
> So:
> I'm trying to build a small application (tachometer with 4-digit
> 7-segment LED display) on PIC14 platform, pic16f648a in particular.
> I wrote some routines in gpasm, tested them, but few parts of the task
> seem unnecessary difficult to code in asm. So, I want to write main
> program in sdcc, which would use already existing asm routines.
> These articles were helpful:
> http://www.btinternet.com/~Peter.Onion/sdcc/sdcc-intro.html
> http://burningsmell.org/pic16f628/
>
> In asm module, few routines are defined ar global:
> GLOBAL _DISPLAY, _DECODE
>
> And when used in C, compiler does not complain.
> extern void _DISPLAY(void);
> extern void _DECODE(void);
> main(){
> _DECODE();
>
>
> But I need to access a variable, defined in asm like this:
> GLOBAL disp_digits
>
> UDATA
> disp_digits res 5
>
>
> What would be the correct way to define that variable in C?
> I tried this:
> extern unsigned char disp_digits[5];
> main(){
> disp_digits[0]="0"; // this is a string attempting to be put in a
> char
> disp_digits[1]="1";
> disp_digits[2]="2";
> disp_digits[3]="3";
>
disk_digits[0] = '0'; // this is a char
> But compiler complains:
> main_lcd_disp.c:37: error 47: indirections to different types assignment
> from type 'const-char [2] code'
> to type 'unsigned-char fixed'
>
>
> Can anybody explain this, or direct me to the correct article to read?
>
> --
> KPL
>
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