[TUT][HARD][SOFT] Fault-Finding LCD Character Displays

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Brian Fairchild
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Location: Eastern England.
#1
Posted by Brian Fairchild: Thu. May 2, 2013 - 06:43 PM
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A common problem is that people can't get their LCD display to work and aren't quite sure where to start.

As I've just been writing some new LCD code I've taken the trouble to knock together a basic fault finding guide. I hope people find it useful.

[E2A]
Topic title updated.
Clarifications suggested by floresta1212 added.

Attachment(s): 

PDF icon LCD fault finding v1.1.pdf

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

#4 Have you proved your chip is running at xxMHz?

#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."

Tags:

Learning and Information, Tutorials
Last Edited: Fri. May 3, 2013 - 05:55 AM
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floresta1212
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Posted by floresta1212: Fri. May 3, 2013 - 02:17 AM
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That's a good start.

Before Steve (Koshchi) gets after you you should change "Display Not Initialized" to Display Not Properly Initialized" (you can leave the 's' in place of the 'z').

As he pointed out a while ago the single line is a result of the LCD controller completing it's "Initializing by Internal Reset Circuit" sequence which sets up the display as a 1-line device.

So the display is initialized, but not correctly since there is some other problem that prevented the program from re-initializing the display correctly.

Don

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