Bob: I inspired myself from your LCDTERM project, so I guess the timing
is not the problem here ;) The delays are of 120 uSecs after a character
or command write.
Mike: Unfortunately, in the ISR I am not writing to the LCD, I am just
updating the variables and setting a flag for modifying the LCD in the
main program.
Robert: I haven't yet tried your solution, but I hope it will work.

Thank you all for your answers.

At this moment I am not sure whether it is a hardware or a software
problem. It is strange that it displays the character before the correct
one.

Lucian

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Bob Blick
Sent: 12 mai 2004 19:37
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] LCD Sometimes Displaying Unwanted Characters

Perhaps a timing issue? If you aren't reading the busy flag, are your
delays long enough?

Cheers,

Bob



>>I have an LCD 2x16 module driven by a PIC16F648A in 4 bit mode. It
>>initialises ok, displays normally, but sometimes it displays the
>>characters at unwanted screen locations or displays unwanted
> characters.
>>I had a clock with blinking ":" displayed, but sometimes the time was
>>displayed at the first row instead of the second.

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