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抱歉我查了下,TCA8418没有驱动程序可以参考。
可以在网上可以搜一下,有些公开的driver,不知您是不是需要linux系统下的,下面这个是linux driver可以作为参考:
https://github.com/torvalds/linux/blob/master/drivers/input/keyboard/tca8418_keypad.c