Green 128x64 2.4 inch Graphic LCD is not working with STM32 Board

Abdulrahman

New member
Hello,

I'm trying to interface the LCD128x64 with STM32H755ZI-Q microcontroller via a parallel interface, and I'm having difficulty displaying some text on the screen. Moreover, I'm using open source library that built for AVR KS0108 and did some modifications on the code to be work with STM32. For more information which LCD I'm using I will attach the product page.

I use CubeMX for designing the pinouts configurations and CubeIDE for coding.

Based on my research, I found the STM32 supplies 3.3V, while the LCD accept 5.0V, so do I need to use voltage shifter? if not provide me some solution.


Thank you for help,
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CF Kelsey

Administrator
Staff member
Hello,

As you say, the CFAG12864B-YYH-V requires 5.0V logic. 3.3V is below the minimum logic voltage as stated in the datasheet. So you will need to figure out how to get the voltages provided by your microcontroller to be within range for the display, like by using a voltage shifter.
1752694168043.png


You might also consider using a display that has 3.3V logic.
 
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