[Lcd-linux] Fwd: Re-vitalizing lcd-linux for Raspberry Pi?

[Mattia Jona-L. <mat...@gm...>]

Hi,

yes, LCD-Linux was written for HD44780 displays connected to a parallel
port but all the parallel port related functions are in the hd44780 driver.
Actually the driver assumes some sort of abstract input/output port that
happens to be the parallel port but can be the GPIO or the I2C port as
well. You just need to modify the two
__read_display/__write_displayfunctions in the hd44780 driver and of
course to provide appropriate
functions to open (init_port) and close (cleanup_port) the communication
port. No need to touch the lcd-linux file.

Coming to your compilation issue, the problem seems to be that the Makefile
script does not recognize your kernel sources as post-2.4 sources and
that's because you have "3.7.9-01010-gc1bd951" as string version. When I
wrote the script I assumed the string version to be the version number
only. Anyway, just edit the lcd-linux Makefile and define KERNEL_VERSION to
3.7.9 and KERNEL_SRC_DIR to the correct kernel source path (seems to be
/lib/modules/3.7.9-01010-gc1bd951/build). This should fix the compiler
issue. I tried with no problems with a pristine 3.7.9 kernel.

Regards,

Mattia




On Tue, Sep 17, 2013 at 2:12 PM, Sven Geggus <li...@fu...>wrote:

> Hello,
>
> looking for a more generic Solution than this one:
> http://learn.adafruit.com/drive-a-16x2-lcd-directly-with-a-raspberry-pi
> (lots of userland GPIO fiddling)
>
> I found http://lcd-linux.sourceforge.net/
>
> I would prefer using this because this would allow for running ncurses
> compatible applications on HD44780 compatible displays, right?
>
> Two Questions:
>
> * Is it possible to compile your code for recent Kernels? Raspberry Pi is
> currently at 3.6.x AFAIR
>
> For now I ended up with the following error:
>  lcd-linux-0.13.9/ > make
> - KERNEL_SRC_DIR: /lib/modules/3.7.9-01010-gc1bd951/build
> - DESTDIR: /lib/modules/3.7.9-01010-gc1bd951/misc
> make TOPDIR= wd -f  wd/Makefile -C lcd-linux lcd-linux.o
> make[1]: Entering directory /home/geg/download/lcd-linux-0.13.9/lcd-linux'
> touch /home/geg/download/lcd-linux-0.13.9/include/lcd-linux.ver
> gcc -D__KERNEL__ -DMODULE
> -I/lib/modules/3.7.9-01010-gc1bd951/build/include
> -I/home/geg/download/lcd-linux-0.13.9/include -Wall -Wstrict-prototypes
> -Wno-trigraphs -O2 -fno-common -fomit-frame-pointer -pipe
> -fno-strict-aliasing  -include
> "/home/geg/download/lcd-linux-0.13.9/include/lcd-linux.ver" -include
> "/home/geg/download/lcd-linux-0.13.9/include/ asename lcd-linux.o .o.ver"
> -DEXPORT_SYMTAB -c lcd-linux.c -o
> /home/geg/download/lcd-linux-0.13.9/modules/lcd-linux.o
> In file included from
> /lib/modules/3.7.9-01010-gc1bd951/build/include/linux/thread_info.h:11:0,
>                  from
> /lib/modules/3.7.9-01010-gc1bd951/build/include/linux/preempt.h:9,
>                  from
> /lib/modules/3.7.9-01010-gc1bd951/build/include/linux/spinlock.h:50,
>                  from
> /lib/modules/3.7.9-01010-gc1bd951/build/include/linux/semaphore.h:13,
>                  from lcd-linux.c:50:
> /lib/modules/3.7.9-01010-gc1bd951/build/include/linux/bug.h:4:21: fatal
> error: asm/bug.h: No such file or directory compilation terminated.
> make[1]: *** [lcd-linux.o] Error 1
> make[1]: Leaving directory /home/geg/download/lcd-linux-0.13.9/lcd-linux'
> make: *** [default] Error 2
>
> * Am I right in the assumption, that your code has been written for a
> HD44780 connected to a parallel port? If so, how much effort would it be to
> port your code to the generic Kernel GPIO or even I2C Interface?
>
> Regards
>
> Sven
>
> --
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>
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