Hey, what's up :)
I'm trying to figure out some control routines for a proprietary 4x2 alphanumeric LCD display. Info I have already:
It's a 14-pin LCD, but in the stock configuration, only 9 pins are used: +5v, GND, contrast, and 6 data pins. The 6 data pins are arranged so that 4 in a row are connected to port 1 pins 4-7 of the micro (at89c2051), and the other two are connected to random pins. So, my first thought was that it was a HD44780 type unit running in 4 bit mode, with the RW pin held to write mode... but initializing and sending data to the module in that style gave absolutely no results (I tried swapping which of the control pins I was using for 'en' and 'rs', but it made no visible difference). I've verified that the screen is working (using the stock chip). Anyone have any ideas for routines to probe for working commands? or better yet, is anyone familiar with any other LCD control module standards that would fit with this description? This manufacturer is a smaller mfg, I'm pretty sure they don't have the funding to design their own controller from scratch :). But of course, they've got the back of the screen (where the control chip is) coated in black epoxy, so I can't get any info there :)