Hi, I have a problem with white blocks on a blue background LCD module. I have uploaded some code to my microcontroller and at first the row of blocks were black then I adjusted the contrast and they turned into white blocks.

Does anyone know what the problem might be? The ports are setup as the attached and the code doesnt return any errors.

 

Standard symptom of the LCD has not initialised properly.

You need to fix your LCD init code, or maybe check the wiring as it can't initialise if the wires are wrong.

 

Do you know where I can find the PIC assembly version? The datasheet for it only shows the initialise code for a 8051 Microprocessor. I just need something to show that its working.

 

Google is your friend.

Since you did not state which PIC, well... you do the math.

http://digital-diy.com/assembly-example/114-mpasm-tutorial-liquid-crystal-display-lcd.html

http://www.piclist.com/techref/io/lcd/pic.htm