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Simple text in I2C w/GLK12232-SM
Posted: Sun Mar 07, 2004 6:03 pm
by psylence
Hey, I've gotten the I2C working seemingly fine on my GLK12232-25-SM, but I can't write simple text to it.
I can do all commands I can verify on the display visually (show a bitmap, clear the screen, change contrast/backlight etc...), but I can't write a string of text. Kinda weird.
I'm assuming it's just something stupid I'm doing, but all I do is a start signal, write the lcd address, then try to write "Hello World!" or whatever, and nothing happens.
Ideas? Do I need to be doing anything extra for non-command data?
Posted: Mon Mar 08, 2004 11:45 am
by Miles
Can you convert the module back to RS232 and try uploading a new font to memory location 1...? Let me know if this is possible?
Posted: Mon Mar 08, 2004 4:15 pm
by psylence
Yeah, I guess I could, that's no fun though!
I'll give that a shot sometime soon. I assume this would cause no text to be displayed if the font has been corrupted/otherwise borked? I did make sure to test all of that, all 3 fonts I have in it before doing the I2C conversion, but I guess it could've gotten messed up somehow.
Posted: Mon Mar 08, 2004 4:40 pm
by Henry
You could send backligh on/off command to the LCD to see if you are talking to it, this way you bypass the font issue.
Re: Simple text in I2C w/GLK12232-SM
Posted: Mon Mar 08, 2004 5:32 pm
by psylence
psylence wrote:
I can do all commands I can verify on the display visually (show a bitmap, clear the screen, change contrast/backlight etc...), but I can't write a string of text. Kinda weird.
Re: Simple text in I2C w/GLK12232-SM
Posted: Mon Mar 08, 2004 5:59 pm
by Henry
psylence wrote:psylence wrote:
I can do all commands I can verify on the display visually (show a bitmap, clear the screen, change contrast/backlight etc...), but I can't write a string of text. Kinda weird.
<sigh> OK, I'm going home.
Posted: Mon Mar 08, 2004 9:09 pm
by psylence
Long day? Post says 7:00pm, slave-drivers up there in Canada I tell ya!
Posted: Wed Mar 10, 2004 4:34 pm
by Miles
Because of how the display works, if you could test uploading a new font or bitmap for me in RS232, I'll be able to tell you exactly what is wrong. If my assumption is correct, you will not be able to... We can establish that you can communicate via I2C with the unit, so this is not the issue. What may be the issue is how the memory chip is handling the fonts, and unfortunately you cannot download fonts or bitmaps in I2C. Let me know how you make out!!