Re: [uCsimm] lissa on epson lcd: succes!

From: Filip Peters (
Date: Thu May 18 2000 - 05:00:24 EDT

Hi Stephen,

I'm now at work so I don't have access to my linux box at home, but I'll send you the
changed code and a working makefile tomorrow. The makefile gives good linking with the
libm library.
The hacks in the code are only to make it work without the framebuffer device, just so
I didn't had to recompile the kernel.


Stephen wrote:

> Hi everyone
> Hello Fillip! It seems that you have hacked the lissa code to ucsimm. I
> am also trying to compile it to run in my ucsimm. However, when I
> compile it, it complaints "could not find stamp.h". After I studied the
> code, I still cannot find out where I can find that .h file. I really
> need your help.
> Thanks
> Stephen
> Filip Peters wrote:
> >
> > If anybody is interested, I hacked the lissa code from the pilot archive to work
> > on the Epson 640x480 lcd. It works quite nicely, altough the lcd isn't very
> > suitable for fast moving things.
> >
> > It didn't require much work, I just removed the framebuffer code, callocated a
> > block memory for the display, and set LSSA to the start of this block (so I
> > could restore the original display after runnung the code).
> > I have looked at the code for the framebuffer in the kernel, but this is only
> > usefull for compatibility. It's quite easy to make it work for the 640x480
> > display, but the only thing you can do with it is ask a pointer to the screen
> > and the screen size. If you want to do double buffering, you need to do it
> > yourself. I'm probably going to try the framebuffer when I recompile the kernel.
> > (although I want to wait for the pre5 kernel ;)
> >
> > The only problem I had was sin and cos: whenever I tried to link with the
> > libmf.a (-lm or -lmf ), the compiler (linker) would complain about sin and cos
> > (something with DISP16 in it, I'm now at a different computer). I ended up
> > recompiling the libm, and linking directly with sinh.o and constf.o ...
> > If anybody has some code examples (makefile) that show how to use the libm.a, I
> > would appreciate it...
> >
> > Filip Peters.
> >

Ir. Filip Peters

This message resent by the list server

This archive was generated by hypermail 2b30 : Sun Apr 07 2002 - 00:01:36 EST