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INPUT1SELECT的定义如下
我理解这个寄存器应该是选择哪个GPIO作为input1的信号源
我不太理解后文中提到的destination是什么意思
0xFFFD: '1' will be driven to the destination 这句的意思是指GPIO1作为input1的信号源吗?
0xFFFF: '0' will be driven to the destination 这句的意思是指GPIO0作为input1的信号源吗?
gpio管脚对于input1难道不是源吗?这里提到的destination (目的)是为什么