I have three suggestions for you:

1) Ask Acroname for their source code and try it on the GLK12232-25-SM. The I2C works the same way with both units.

2) Try slowing down yor software routines. Keep your routines short and put a delay between specific bytes.

3) You may want to try using RS232 or ...

I tried out the LCD tester program on my LCD (GLK12232-25-WBL) and for the
model number it comes back as 0xff, when it is supposed to come up as 0x22, all the other functions work fine so I know that the comm port is connected correctly.

Also I am only connecting the rx,tx and Gnd lines, is this ...

I tried out the LCD tester program on my LCD (GLK12232-25-WBL) and for the
model number it comes back as 0xff, when it is supposed to come up as 0x22, all the other functions work fine so I know that the comm port is connected correctly.

Also I am only connecting the rx,tx and Gnd lines, is this ...

Have you tried running other I2C devices on the bus, such as a memory chip, etc...?

Yes I have tried running a compass module that has an I2C interface, and that works fine, I also tried two different brainstems and I get the same results.

The guys at acroname use your LCD0821 display and for ...

Can you tell me what pull up resistors are being used on the I2C bus...? From your description of the components in question, I believe you are refering to our contrast cct. and this will have no part in the communication problem. Have you tried slowing down to something below 100kbps...It is ...

Hello...

When your communicating with your Brainstem Micro, are you bit bashing or are you using I2C functions...? The "flux" you probably see is from our rosin core solder when we connect the display to the PCB...this will not cause any problems...


I am using the I2C function of the brainstem ...

I recently purchased the above LCD model and have connected it to a Micro controller (brainstem) via the I2C bus. According to the spec sheet the display runs at 100kpbs. However I am seeing strange behavior when sending numerical strings of greater than two characters.
If I change the speed of the ...