GPIO, AFIO
o read/write the AFIO_EVCR, AFIO_MAPR and AFIO_EXTICRX registers, the AFIO clock should first be enabled. Refer to Section 7.3.7: APB2 peripheral clock enable register (RCC_APB2ENR).
AFIO_MAPR
外部中断 EXI
o read/write the AFIO_EVCR, AFIO_MAPR and AFIO_EXTICRX registers, the AFIO clock should first be enabled. Refer to Section 7.3.7: APB2 peripheral clock enable register (RCC_APB2ENR).
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