Sparkfun serial LCD v2.5 4x20

Archive SparkFun Site Questions/Comments
1

After successfully operating the LCD for several days, I have encountered an issue that does not appear to be related to the software.

When powered up, it takes about 40 seconds until the splash page appears and then is remains for about 4-5 mins. After this the screen goes blank and the device will not accept any commands.

I have tried sending the reset command 0x7C ‘r’. I am assuming that is one of the ascii control characters from 0x11 to 0x14. I have tried all of these combinations. It is not clear to me from the documentation

None of these have had any effect. If anyone had any ideas on how to reset the device, Id appreciate the info.

Hoping I have not got a dead LCD display.

thanks

gs

2

Did you ever get your serial interface to work as I am really battling…

All I get is two lines of blocks.

3

GrahamG:
Did you ever get your serial interface to work as I am really battling…

All I get is two lines of blocks.

Have you tried adjusting the contrast?
4

Yes I did. Adjusting the contrast pot seems to go from “all blocks” to a blank screen !

It is very frustrating as the concept of running a parallel LCD from a single TXD pin is GR8