Hi roelof,
Thank u for ur advices!
I have a new trouble with simulating the .hex code on my 8051.
The newpp.hex according to the newpp.c(as follow):
//newpp.c
#include <AT89X51.H>
#include<8051.h>
__sfr __at (0xf1) f_wren;
__sfr __at (0xf2) f_pp;
__sfr __at (0xf3) f_wr_adrH;
__sfr __at (0xf4) f_wr_adrM;
__sfr __at (0xf5) f_wr_adrL;
__sfr __at (0xf6) f_wr_dataH;
__sfr __at (0xf7) f_wr_dataM1;
__sfr __at (0xf8) f_wr_dataM2;
__sfr __at (0xf9) f_wr_dataL;
__sfr __at (0xfa) f_rw;
__sfr __at (0xfb) f_work;
void main(void)
{
f_wren=0x06;
f_pp=0x02;
f_wr_adrH=0x00;
f_wr_adrM=0x02;
f_wr_adrL=0x00;
f_wr_dataH=0x12;
f_wr_dataM1=0x34;
f_wr_dataM2=0x56;
f_wr_dataL=0x78;
f_rw=0x01;
f_work=0x01;
while(F1==0)
f_work=0x00;
}
Line 18,f_wren at 0xf1 should have been assiged the value 0x06.However
the result of simulation is wrong,the f_wren's value did not changed.
I check the newpp.asm which is generated according to the newpp.c.The
newpp.asm is correct.
In newpp.asm's corresponding position generated the statment: mov
_f_wren,#0x06.
Thus I guess the compile is fine, the assembler or the linker may make
some mistakes.
So,that is question:
1.what is the mistake exactly?
2.I wrote another assebly files(pp.asm) and involved the
sdas8051.exe,hoping to generate a hex file to be compared with the
newpp.hex.
So I can find out the mistake by comparing the pp.hex with
newpp.hex.
The command of sdas8051 is sdas8051.exe -x pp.hex pp.asm,but it did
not work,nothing to be generated.
However,the command(sdas8051.exe -o pp.rel pp.asm) generated the
pp.rel
question:How can I use the assembler to generate the .hex file?
2011/3/23 roelof 't Hooft <roel...@itholland.nl>
> Hi Donald,
>
> On Wed, 2011-03-23 at 14:13 +0800, duck donal wrote:
> > Hi,Krish
> > Thank you so much for answering my questions detailedly!
>
> Krish does a much better job in explaining then I do, I can
> learn form him :-)
>
>
> > I‘ve got it.Thus next time I'll check the <****.h> file to find out
> > the specific register name of machine in SDCC.
>
> Actually you should read the datasheet and user manual that
> belongs to your specific processor and then check the header
> file for the correct statements. I personally hate the upper
> case names used in the header files so I tend to rewrite a
> header file for my specific processor.
>
>
> > Now I really want to know what SDCC compile flow is.How a c code
> > become to be a assembly code,even the machine code?
>
> Why would that be interesting to know other than the fact that
> it just works or you want to write compiler/linker stuff ?
> Go ahead and read this :
> http://sdcc.sourceforge.net/doc/sdccman.html/node186.html
>
> I for one have no clue about the compiler/linker/assembler
> internals and I do not really care about that :-)
> Just happy that there are good people out there willing to spend
> time on writing it !
>
>
> > What is the differences between SDCC and GCC?
>
> SDCC is typically targetted at the 8051 and PIC processors. There
> are a few other architectures for which it can generate code. But
> as far as I know it started out as being a compiler for the 8051.
> GCC is a compiler which normally generates code for i386 and the
> like. Due to the structure it can (only ?) be retargetted for other
> 32bit processors. I use it for my arm7 and cortex-m3 projects.
>
> roelof
>
>
>
>
>
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