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add PCF8574(A) port expander as passive 4x4 keyboard #11770

add PCF8574(A) port expander as passive 4x4 keyboard

add PCF8574(A) port expander as passive 4x4 keyboard #11770

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build-stm32 (rak3172)  /  build-stm32

succeeded Dec 29, 2024 in 2m 57s