Ken Van Hoeylandt
11 lines
467 B
Markdown
11 lines
467 B
Markdown
# CH422G I/O expander
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A driver for the `CH422G` I2C-bus I/O expander by WCH, commonly used on Waveshare ESP32
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display boards to drive display/touch reset and enable lines.
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Exposes EXIO0-7 as a `GPIO_CONTROLLER_TYPE` device. The chip has no register to configure
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per-pin direction and no readback for its output register, so only output pins are supported
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and the driver keeps a local shadow of the last written value.
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License: [Apache v2.0](LICENSE-Apache-2.0.md)
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