LCD0821 problem
Posted: Sun May 02, 2010 1:10 pm
Hi all,
Just bought an LCD0821, latest versions I believe.
It has been working fine, however, the problem I have is as follows:-
I have it connected to an Arduino in RS232 TTL mode. Nowe, when I send new code to my Arduino via the Usb port it also repeats the data on the RS232 TTL output.......the net result is that when updating code on the Arduino the LCD0821 will flash up all sorts of stuff until the comms is done.
Usually at that point when the Arduino re-boots all is fine and the LCD0821 is fine.
However, sometimes the LCD0821 doesn't startup, the display stays completely blank and the only thing that works is the control codes for the likes of brightness etc.
Also, sometimes it's not completely blank, maybe row 1 & col 1 are able to be written to, the rest stays blank.
I have the link fitted that sets the display to factory defaults.
This has happpened a few times and the only way to fix is to keep uploading new code to the Ardiono in the hope that the display "resets" itself.
I notice that when the LCD was working fine when I power up I'd get some random characters on the display before my comms starts........but now it's completely blank. Is this significant?
I have tried setting the data unlock level to 0 in my Arduino code....no luck.
Whilst I am on this, the manual has me confused in regard to datalock.
254 202 245 160 [level]
or
254 203 245 160 [level]
Difference here?
Any ideas?......maybe I need to reset the character set....how?
Ian.
Just bought an LCD0821, latest versions I believe.
It has been working fine, however, the problem I have is as follows:-
I have it connected to an Arduino in RS232 TTL mode. Nowe, when I send new code to my Arduino via the Usb port it also repeats the data on the RS232 TTL output.......the net result is that when updating code on the Arduino the LCD0821 will flash up all sorts of stuff until the comms is done.
Usually at that point when the Arduino re-boots all is fine and the LCD0821 is fine.
However, sometimes the LCD0821 doesn't startup, the display stays completely blank and the only thing that works is the control codes for the likes of brightness etc.
Also, sometimes it's not completely blank, maybe row 1 & col 1 are able to be written to, the rest stays blank.
I have the link fitted that sets the display to factory defaults.
This has happpened a few times and the only way to fix is to keep uploading new code to the Ardiono in the hope that the display "resets" itself.
I notice that when the LCD was working fine when I power up I'd get some random characters on the display before my comms starts........but now it's completely blank. Is this significant?
I have tried setting the data unlock level to 0 in my Arduino code....no luck.
Whilst I am on this, the manual has me confused in regard to datalock.
254 202 245 160 [level]
or
254 203 245 160 [level]
Difference here?
Any ideas?......maybe I need to reset the character set....how?
Ian.