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GPIO pin 和 GPIO port 该怎么理解?

Other Parts Discussed in Thread: TMS320C6678

我使用的DSP为TMS320C6678 ,该款DSP一共有16个GPIO, 但是看见例程里说到了 GPIO PORT 和 GPIO PIN ,我不太明白他们俩分别代表什么意思?我参考的是

ti-processor-sdk-rtos-c667x-evm-06.00.00.07\pdk_c667x_2_0_14 里的gpio驱动 里的 GPIO_board.h