IC的一根管脚，做多种外设的复用pin，很常见，在PA0上，只能作为一种外设的管脚，但两个外设能同时用吗，当然是可以的。可以设置STM32中有的寄存器AFIO_MAPR来配置复用管脚及外设接口的重新映射，比如你选择PA0为UART2的CTS，PA0肯定不能再作为TIM2的channel1，但可以设置TIM2的channel1的管脚为PA15，请参考如下寄存器说明： Bits 9:8 TIM2_REMAP[1:0]: TIM2 remapping These bits are set and cleared by software. They control the mapping of TIM2 channels 1 to 4 and external trigger (ETR) on the GPIO ports. 00: No remap (CH1/ETR/PA0 CH2/PA1 CH3/PA2 CH4/PA3) 01: Partial remap (CH1/ETR/PA15 CH2/PB3 CH3/PA2 CH4/PA3) 10: Partial remap (CH1/ETR/PA0 CH2/PA1 CH3/PB10 CH4/PB11) 11: Full remap (CH1/ETR/PA15 CH2/PB3 CH3/PB10 CH4/PB11)
