Re: Auto assign variable value through assembler directive instead of code

--- Peter Kuhar <peter@...> escribió:

> Is this a global variable???
> 
> On 9/30/07, David Lucena <yakumoklesk@...> wrote:
> >
> > I am using SDCC to program a z80 machine. When I create this code:
> >
> > unsigned char test = 0;
> >
> > It is assembled as follows:
> >
> >         ld      iy,#_test
> >         ld      0(iy),#0x00
> >
> > But I would like that it could be initialized as its done in assembler:
> >
> > test:
> > .db 0
> >
> > Is there any way of forcing this behavior?
> >
> > Thanks.

Yes it is a global variable.

By the way, it is permitted in this list the TOP message posting?

Thanks.

Re: Auto assign variable value through assembler directive instead of code

David Lucena schrieb:
> I am using SDCC to program a z80 machine. When I create this code:
> 
> unsigned char test = 0;
> 
> It is assembled as follows:
> 
> 	ld	iy,#_test
> 	ld	0(iy),#0x00
> 
> But I would like that it could be initialized as its done in assembler:
> 
> test:
> .db 0
> 
> Is there any way of forcing this behavior?

const unsigned char test = 0;

will do if test is a global variable. sdcc assumes that your program
resides in ROM, so it can use .db only for read-only stuff.

Philipp

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Re: Auto assign variable value through assembler directive instead of code

Thanks.

So there is no way of initializing it this way but without making it constant?

.com files usually has this information saved in the file itself and when they are loaded prior to
execution, the variables are already initialized this way. I know I can do this in assembler,
because I have already done it, and made the variables also global, but now I intent to do in .c
source file because of some needs.

The only workaround I find is declaring them as external and then create an asm file that define
them as global and already initialized the way I want, but this is a little ugly.

If there is any other idea I would appreciate it.

Thanks again.

       
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problem compiling pic16 libraries

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Re: problem compiling pic16 libraries

On 10/2/07, Philip Baltar <pb.listbox@...> wrote:
> I'm in the pic16 source directory, but I'm getting an error when I run
> configure:
>
> checking for gpasm... gpasm
> checking for gplink... gplink
> checking for gplib... gplib
> checking for rm... rm -f
> checking for cp... cp
> checking for mv... mv
> checking for ls... ls
> checking for sed... sed
> checking for egrep... grep -E
> checking for mkdir... mkdir -p
> checking for rmdir... rmdir
> checking whether make sets $(MAKE)... yes
>  configure: creating ./config.status
> config.status: creating Makefile
> config.status: error: cannot find input file: Makefile.in
>

What operating system do you use for compiling this pic16? BSD, Linux,
or Windows?
I have tried it in OpenBSD, Linux, and Windows, and some times it
needs some tweaking.

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Re: problem compiling pic16 libraries

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Re: Auto assign variable value through assembler directive instead of code

David Lucena schrieb:
> Thanks.
> 
> So there is no way of initializing it this way but without making it constant?

sdcc is very bad at initializing variables effieciently. Just have a
look at feature request #1565720. sdcc will initialize global constant
arrays as it should and generate lots of code for everything else.

Philipp

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Re: problem compiling pic16 libraries

On 10/2/07, Philip Baltar <pb.listbox@...> wrote:
> I'm on linux.

It should be no problem, when compiling on linux. What version of SDCC
do you use?
I assume you get the pic16 package from this SDCC source. Did you do
the compiling in the sdcc source tree?

Last time I had almost similiar problem on OpenBSD, but it was because
of different shell, OpenBSD ksh and linux use bash. Primarily the SDCC
developer use Linux as their development platform, so it should not be
a problem.
Could you actually see "Makefile.in" in your current compiling directory?

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Re: PIC not executing using any power supply other than the computer USB port

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Re: PIC not executing using any power supply other than the computer USB port

On 10/3/07, Stanley Lee <stanigator@...> wrote:
> prak <at> prak-laptop:/media/sda5/Dairy Cow Research/datalogging
> scale/software/LED_toggle$ make

No idea of your real problem. But firstly please use short path
name and try again. I am not sure if sdcc likes the spaces
in the directory name.

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