The screen becomes blurred when IO expander is enabled.

[prowong]

Describe the bug
The tcmenu works well until the PCF8575 IO expander is selected in the tcmenu desiginer. generate and upload the code, the screen becomes blurred, event I haven't wired them up yet.

Commerical or Personal use
Personal use

Embedded environment
Arduino ide 1.8.19
Board: ESP8266

Display: ST7789 driven by TFT_eSPI, connected with HW SPI
TFT_CS----GPIO 15
TFT_DC----GPIO 0
TFT_RST----GPIO 2

PCF8575 expander board, address: 0x20
SCL----GPIO 5
SDA----GPIO 4

Screenshots

Before adding the IO expander, it looks normal.

Is my setting wrong? Your projects are very helpful for the beginner like me, thank you.

[davetcc]

Please raise this as a discussion, it is not an issue. Issues are confirmed broken behavior in the libraries somewhere, this is most likely an electrical issue on your board.

[davetcc]

I've moved this to a discussion, have you checked for electrical interference, it is highly unlikely that either TFT_eSPI or tcMenu libraries caused this.

Start with the simplest TFT_eSPI example and check if it exhibits the same symptoms first. With the simplest graphical example running you can then try to evaluate if you are taking too much power from the board or have wiring issues.

[prowong]

Sorry it was my mistake. I finally realized that the DC pin cannot be connected to GPIO0. After I reconfigured the gpio it worked fine. Confusingly it runs the graphical example or the menu example appears to be displayed normally. Anyway thank you very much.