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Please help me with I2C communication between LCD and PIC!

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electrodarkness

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HI everyone!

I want to develop an interface for a project. On this Interface There is an I2C 2x16 LCD (attached datasheet), SPI communication with main board,UART for debugging. The micro controller used is a PIC18F26K22 (attached schematic).
The problem is, the LCD won't display anything. I tested the I2C in Proteus, and with logic analyzer, and the written data is sent. I can't find the problem.

Any help would be appreciated!
 

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  • RX1602A5-GHW-TS.pdf
    2.5 MB · Views: 54
  • GUI.X.rar
    1.9 KB · Views: 56
  • GUI.pdf
    23.8 KB · Views: 67

If you are testing in Proteus then you have to connect I2C debugger. Are you sure there is I2C LCD in Proteus ?

Zip and post the complete MPLAB X XC8 project files and Proteus file.
 

Take this project as the reference. There are same LCD working with I2c port expander.
 

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  • PCF8574_LCD.rar
    341.8 KB · Views: 58

milan.rajik In proteus indeed I'm using I2C/SPI debugger, but I'm also testing it on The finished hardware.
I attached the proteus and MPLAB projects.
Easyrider83 Thanks for the code, I think I didn't put testing in cycle after sending data. I will try it as soon as possible.
 

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  • SIM.zip
    226.7 KB · Views: 56

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