LK202-25 backlight problem

RussCA · Post by **RussCA** » Tue Nov 09, 2004 10:07 am

Hi, I'm new to the forum. I have been developing driver software for the LK202-25 Matrix Orbital LCD (purchased from Parallax) to run on the JKMicro Flashlite 186 signle-board computer.

I am using the I2C interface. Everything seems to be working properly, with the exception of the backlight commands.

I can issue a backlight on command, and it turns off in the appropriate number of minutes. However, a subsequent backlight command does not turn the backlight back on. I have tried doing a backlight off immediately prior to the backlight on, but this does not help.

Any ideas are welcome!

Tom · Post by **Tom** » Tue Nov 09, 2004 10:41 am

Was " (254 70) (R) " the command you used to turn the backlight off?

RussCA · Post by **RussCA** » Tue Nov 09, 2004 11:07 am

Hi, Tom!

I used:
0xFE 0x46 to turn backlight off
0xFE 0x42 0x01 to turn it on

Miles · Post by **Miles** » Tue Nov 09, 2004 11:18 am

Hi Russ,

You are using the commands perfectly. The problem is a minor bug that involves the backlight. You may have received a unit that slipped through testing before the "bug" was verified. The only way to turn the backlight on after that particular function is to physically power down the module and power it up again. I understand that this may not be a suitable solution to your problem, therefore if you contact me at myero@matrixorbital.ca, we'll set up an RMA immediatley. I will be sending you a "special" unit in return that you will enjoy!! Would you like me to set this unit in TTL or RS232 mode for you?? Sorry for any inconvenience regarding this matter.

RussCA · Post by **RussCA** » Wed Nov 10, 2004 12:23 pm

Miles,

I sent an email to you, but I haven't heard back yet.

Can you tell me how to contact the "ping.be" folks? I hound a couple of problems in their psuedo code for the I2C bus.

Russ

Miles · Post by **Miles** » Wed Nov 10, 2004 12:26 pm

I sent you an email yesterday....

I'll resend after lunch...The "ping.be" folks...???

RussCA · Post by **RussCA** » Wed Nov 10, 2004 2:46 pm

Miles,

No email(s) received from you as yet. Do you have the correct address: home.rr@cogeco.ca

The "ping.be folks" refers to the URL given in the document for the LK202-25 where to get information regarding the I2C protocol.

The only email I've received was the one telling me I've been accepted into this forum.

Miles · Post by **Miles** » Wed Nov 10, 2004 2:56 pm

Interesting...I'll get Tom to email you...!!

Tom · Post by **Tom** » Wed Nov 10, 2004 3:17 pm

Contacted via email.