RE: [Sdcc-user] SDCC for AT89c52

[BRACH V. <v....@sm...>]

Hum, it's curious in ASM it worked well (without two write for P1 to
indicate the IO port direction) and in C did'nt work :(

It could be no startup code (??)

What's you compilation lines options ?

Personally I compil with Makefile in two time (I'm working on linux
station with large-model compilation):

1/ Compiling : 
    /usr/local/bin/sdcc -c -mmcs51 --debug --model-large --debug
--no-xinit-opt --opt-code-size -I/usr/local/share/sdcc/include main.c
...
...
other C modules
2/ Linking and packihx :
    /usr/local/bin/sdcc --model-large --out-fmt-ihx --code-loc 0x0000
--code-size 0xFFFF --data-loc 0x00 --idata-loc 0x80 --iram-size 0x100
--xram-loc 0x0001 --xram-size 0x7FF  --debug --no-xinit-opt
--opt-code-size -L/usr/local/share/sdcc/lib main.rel

and

    /usr/local/bin/packihx main.ihx > main.hex

In fact, all C files compiling generate .rel files, and linking step
link all .rel file (with main in first if you've got multiple modules)

In windows I think you could try :

c:\sdcc\mycode>sdcc -c -mmcs51 --model-small led.c

    check at this point your asm code in .lst file gerenated.

c:\sdcc\mycode>sdcc --model-small --out-fmt-ihx --code-loc 0x0000
--code-size 0xFFFF --data-loc 0x00 --idata-loc 0x80 --iram-size 0x100
led.rel
c:\sdcc\mycode>packihx led.ihx > led.hex

Nota : lots of compil and link options are indicated but not necessary
(default option), but I find more explicit to view them.

Check your first line in your .hex file :

for example :06 00 00 00 02 C3 63 02 07 E3 E6

At adress 0x0000 (start vector) you must have 02 (jump) C363 your start
code (for example)

At this time you'll sure your program well jump at startup code.

Regards,

Vinzzz



> 
> I edited my code as your suggestion, but it still doesn't work. 
> My board is OK, because I write a small program in Assembly and  
> use ASM51 to generate HEX file, it works well.
> 
> ------------------ led.asm --------------------- 
> $mod51  ; symbol definitions            
> 
>                 org        00h 
>                 ljmp    main 
> main:                            
>                 mov        p1,#0Fh      ; Turn on all led
> 
>                 end 
> -------------------------------------------------
> 
> Regards
> 
> Nguyen.
> 
> -----Original Message----- 
> From: sdc...@li... 
> [mailto:sdc...@li...]On Behalf Of BRACH
> Vincent 
> Sent: Friday, February 03, 2006 6:13 PM 
> To: sdc...@li... 
> Subject: Re: [Sdcc-user] SDCC for AT89c52
> 
> 
> On 51 base microcontroler on P1 and P3 port used as IO, you must
> write 
> (before writing your output value) one time on P1 or P3 to specifie
> the 
> direction of the IOs : 
> 
> void main(void) 
> { 
>   P1 = 0x00 ; // all pin of P1 port are standard IO in output mode 
>   P1 = 0x0F ; // Led On on b7 to b4 on P1 
>   while (1) ; 
> }
> 
> (for current specification you MUST turn on LEDs on low level, high 
> level have'nt enough ouput current to turn on a LED)
> 
> ____ 
>     |       
>     |     Vcc 
>     |      | 
>     |     _|_     
>     |    _\_/_  LED 
>     |      |  
>   8 |      | 
>   9 |     | |   R 
>   c |     |_| 
>   5 |P1.4  | 
>   2 |-------            LED turn on with low level on P1.4 
> ____|
> 
> ++ 
> Vinzzz
> 
> 
> > Hi All 
> >  
> > I use SDCC to write program in C for AT89c52 at the first time.  
> > After compiling a simple program like this 
> >  
> > ------- led.c --------------------  
> > #include <at89x52.h>  
> > void main(void)  
> >         {  
> >         P1 = 0x0F;  
> >         while(1)  
> >         {}  
> >         }  
> > ---------------------------------- 
> >  
> > c:\sdcc\mycode>sdcc led.c 
> >  
> > I get the file led.ihx  
> > Then I use "packihx < led.ihx > led.hex"  
> > to generate Intel Hex file. 
> >  
> > I use "EZ Uploader V3.0" to load led.hex to my chip AT89c52 
> > sucessfully.  
> > But the code don't work, All 8 LEDs on my board are off (4 of them 
> > must be on). 
> >  
> > I also try to load led.ihx to AT89C52 but It still doesn't work. 
> >  
> > Please tell me what I need to do to make my code work. 
> >  
> > Regards, 
> >  
> > Nguyen 
> > 
> 
> 
> 
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