Support for WCH(Jiangsu Qin Heng) CH422G I/O Expander

[lboue]

Describe the problem you have/What new integration you would like

Support for WCH(Jiangsu Qin Heng) CH422G I/O Expander

Please describe your use case for this integration and alternatives you've tried:

Waveshare ESP32-S3-Touch-LCD-4.3 board: As the 4.3-inch screen occupies most GPIO pins, we use a CH422G chip to expand IO for functions like reset and backlight control.

• Manufacturer WCH(Jiangsu Qin Heng)
• Mfr. Part # CH422G
• LCSC Part # C57543
• Package SOP-16
• Description 8 * 1MHz SOP-16 I/O Expanders
• Datasheet: https://www.lcsc.com/datasheet/lcsc_datasheet_2403131123_WCH-Jiangsu-Qin-Heng-CH422G_C57543.pdf

Additional context

[lboue]

I found 2 forks from ESP32_IO_Expander that include drivers for CH422G I/O Expander:

• kylix-rd: ESP32_IO_Expander
• ktand: ESP32_IO_Expander

This could help to add support to ESPHome.

[nagyrobi]

We need ESP-IDF compatible component for this (to drop Arduino on ESP32-xx)

[lboue]

ESP32_IO_Expander Release v0.0.3 is out with CH422G support:

v0.0.3 - 2024-05-07 Enhancements:

• Add support for CH422G from Waveshare
• Update the example to show how to use the CH422G

[lboue]

I found 2 forks from ESP32_IO_Expander that include drivers for CH422G I/O Expander:

• kylix-rd: ESP32_IO_Expander
• ktand: ESP32_IO_Expander

This could help to add support to ESPHome.

Or maybe it could be added a ESPHome component like another PCA9554 I/O Expander.

[Per4merKC]

I'm interested in this also... Thanks!

[styphonthal]

Has anyone moved forward with this?

[lboue]

Has anyone moved forward with this?

No.

[jesterret]

It would be great if anyone is interested in trying it out and giving me feedback on it ;)

[lboue]

It would be great if anyone is interested in trying it out and giving me feedback on it ;)

Working fine and tested with this config file: Waveshare_ESP32-S3_Touch_4.3.yaml

[lboue]

CH422G support has been merged into dev branch:

Thanks @jesterret.