Re: [Lcd-linux] Connecting HD44780 to AT91SAM9260

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

Hi,

I'm sorry, but what do you mean by an 'hd44780 device'? The important
point is to have in the dev directory a character device with major
number 120 and minor number 0 and this is the char device you have to
write to/read from. The name in itself is not important. In the
documentation I assumed this to be /dev/lcd but can be whatever else.
To be more precise, since lcd-linux can virtually handle up to 256
different displays (with major number 120 and minor number from 0 to
255) I assumed the name to be something like /dev/lcd0, /dev/lcd1 and
so on, but again, the name in itself is not important. The creation of
the char device is handled by the udev service, but for this to work
you need to install the file 60-lcd-linux.rules in the appropriate
place of your distribution. If you don't have the udev service, you
need to create the char device by hand, with mknod.

Hope it helps.

Regards,

Mattia

On Wed, Jul 14, 2010 at 10:38 AM, Anselm Busse <ab...@cs...> wrote:
> Hi,
>
> I am working on a similar setup right know. Only difference is that I use a AT91RM9200 and the data pins of the LCD are connected to the data bus of the MCU, so the LCD is memory mapped.
>
> I have already modified the read and write functions and getting "reactions" from the LCD. But right know I am a little bit confused about the device interface. I have only a hd44780 device in my /dev tree but the doc says there should be a lcd device. So do I have to write to the hd44780 device to get an output on the LCD or is there something wrong because of the missing lcd device?
>
> Oh and I have compile the driver statically into the kernel. In case this is important.
>
> I would appreciate some help about this issue and will of course post my results if they are working. I think they can be easily adapted to a completely GPIO attached LCD.
>
> Regards, Anselm
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