Re: [Lcd4linux-devel] new driver for graphic LCD on linux router

[Bryan K. <bka...@ii...>]

Hey guys,
many thanks for the responses!
I guess I should have been a little more detailed from the start. my  
apologies.

I'm using a Buffalo router with OpenWRT on it. The buffalo has a  
broadcom processor on it, which has a couple GPIO on it. The GPIO are  
originally used to control LEDs for status, but I removed them and am  
using the GPIO to control the LCD. The LCD uses 9-bit SPI data. The  
first bit determines whether the following data is a "DATA" or  
"COMMAND" value.
http://www.sparkfun.com/commerce/product_info.php?products_id=569

Here is the datasheet:
http://www.sparkfun.com/datasheets/LCD/S1D15G10D08BE_TM_MF1493_03.pdf


I coded up a very basic kernel driver and hacked a test program out.
http://www.youtube.com/watch?v=Xjdy9p-VSow

Also, I think this display is supported by serdisplib (i know there  
is a plugin), but again, not for a custom SPI interface (as far as i  
can tell).
I want to use lcd4linux so i dont have to reinvent the wheel and  
recode character drivers and widgets and etc etc, when its all been  
done so nicely already :)

So to summarize,
I'm controlling the SPI LCD from the GPIO on the target hardware  
processor using a basic kernel character driver. I'm wondering how to  
get this to work with lcd4linux.
I haven't looked at the I2C sources yet, but I'm assuming they use  
some kind of onboard I2C chip or interface already located on the  
motherboard.

I'll check them out anyways to take a look.
Thanks for reading and any heads-up on this.

On Apr 28, 2008, at 3:05 AM, Luis.F.Correia wrote:

> Hi!
>
>> -----Original Message-----
>> From: lcd...@li...
>> [mailto:lcd...@li...] On
>> Behalf Of Michael Reinelt
>> Sent: Monday, April 21, 2008 8:35 AM
>> To: Bryan Kaminski
>> Cc: lcd...@li...
>> Subject: Re: [Lcd4linux-devel] new driver for graphic LCD on
>> linux router
>>
>> Hi Bryan,
>>
>>> i coded up a really basic linux character driver for a Nokia color
>>> graphic LCD (tested and working)
>> Sounds interesting!
>>
>>> But the thing is, its controlled by the processor's GPIO ports,not
>>> RS232 or parallel. I'm not sure how to write a driver for
>> lcd4linux
>>> that would access these pins.
>> Have you got some more information about the device? Is the display a
>> standalone display with a i2c interface, or is it something like a
>> complete "embedded system"?
>>
>> There are some i2c drivers available, just grep the sources
>> to get some
>> hints. There are several guys here who are working with i2c (I am  
>> not)
>
> I am :)
>
> When you talk about the processor GPIO, are you referring to the  
> processor
> on the LCD display itself, or the intended linux hardware?
>
> Please give us more detail, I2C is a valid option, I'm using a display
> from an HP printer in I2C mode without major problems so far.
>
> Luis Correia