FGPIO和GPIO寄存器的使用

cl17726

我是用的是KL02处理器.

手册中既然说明了FGPIO是GPIO寄存器的别名,并且有单周期访问的特性,那么,是不是GPIO寄存器就没访问的必要,可以全部都访问FGPIO上,他们寄存器的表达是完全一样的.

The GPIO registers are also aliased to the IOPORT interface on the Cortex-M0+ from address 0xF800_0000. Accesses via the IOPORT interface occur in parallel with any instruction fetches and will therefore complete in a single cycle. This aliased Fast GPIO memory map is called FGPIO.
Any read or write access to the FGPIO memory space that is outside the valid memory map results in a bus error. All register accesses complete with zero wait states, except error accesses which complete with one wait state.

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小恩GG

从控制GPIO的输入，输出角度看，你可以这样理解