Re: AW: [Lcd4linux-devel] USB based hd44780 units ...

[Paul K. <pau...@xs...>]

Hi Till,

I had a very quick look at it. It looks like a very nice and simple 
solution indeed. I have to look into the BWCT driver, to see what makes 
it special. But for the I2C interface we created additional support next 
to the parallel port implementation. My guess would be that for USB 
something similar would happen.

Looking forward to your results,

Paul


li...@ha... wrote:

>Hi,
>
> --- Ursprüngliche Nachricht --- 
>Datum: 20.01.2006 16:43
>Von: Paul Kamphuis <pau...@xs...>
>  
>
>>Till, I really like the idea of a $5 DIY USB interface for a HD44780. 
>>What are you planning on using?
>>    
>>
>There's a nice project to do software bit-banging usb with atmel avrs
>(http://www.obdev.at/products/avrusb/index.html). I flashed the sensor 
>example code onto one of my atmega8 demo boards and it was immediately
>recognized by my pc. It should be quite simple to add 4 bit lcd interface
>to this. The firmware doesn't need to know much about the display, since
>the bwct driver sends the hd44780 commands via usb. I'll only have to do 
>some small tests to e.g. prevent the pc from switching the display into
>8bit mode. Other than that i can just forward any command directly to the
>display. I am planning to allow for two controllers and make contrast and
>backlighting configurable via usb. Only few parts will be needed besides 
>the avr itself. Even the 40mA for the backlight leds may be driven
>directly 
>by the avr. The whole device is meant to be open source/open hardware, so
>you can start heating up the soldering irons ...
>
>The whole device will not be 100% usb compliant. The soft-usb
>implementation
>does not allow for all the necessary crc checks and the like and the
>final
>device will not meet the usb spec regarding power consumption etc. But it
>should work good enough for most applications.
>
>I do understand, that the other usb adaptors are sold with few different 
>display types only. But i'd like to use as much different display as the
>generic hd44780 driver does. I am still not convinced, that having a
>seperate
>usb driver doing much of the same things the generic driver does (e.g. 
>adopting the addressing scheme for 16 col displays) is a clever thing ...
>
>Ciao,
>  Till
>
>
>
>
>
>
>
>
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