Subject:
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Re: Manipulate the LCD in assembler
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 28 Aug 1997 13:35:55 GMT
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Original-From:
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David Negro <dnegro@[AvoidSpam]cognex.com>
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Viewed:
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1232 times
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Folks,
I gave it a little more thought, and had some coffee to wake me up. I
remember now! Somehow I blew out the D0 line on my LCD and I had to use 4
bit mode from then on since the upper 4 addresses were still fine. I had
forgotten that a long time ago I had modified my Pcode to work with my
broken LCD. So now the code that I pointed to below should work fine for
everyone else. I have a 40x2 LCD so some small modifications to the
initialization might have to be made for those with different LCD modules.
-Dave
---------------------------------------------------
Folks,
Ok, I took a look at the code last night. I found simple errors like not
initializing the stack, addressing variables in RAM chip when in single
chip mode and forgetting to use # for immediate data. Simple mistakes
that
I have made more than my share. I cleaned it up however, and almost have
it working. It now seems to initialize the LCD correctly. I wrote a
routine to output 'A'-'Z' on the screen but instead it prints out:
'@BBDDFFHHJJLLNNPPRRTTVVXXZ'
Simple enough. Looks like the data line 0 is stuck low. Nope. I
immediately opened up interactive C without changing my setup, and it
worked fine. So what is the issue? I am very confused. If anyone is
willing to take a look at the code, please point your web browser to:
http://falcon.arts.cornell.edu/~dnegro/temp/Prueba4.a
or I can mail you the file.
Thank you,
-Dave Negro
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