stm32f407 GPIO_PinAFConfig 函数

备用功能配置（除ADC和DAC外的所有非GPIO功能），使用函数
void GPIO_PinAFConfig(GPIO_TypeDef* GPIOx, uint16_t GPIO_PinSource, uint8_t GPIO_AF)

     This GPIO_AF can be one of the following values:

       @arg GPIO_AF_RTC_50Hz: Connect RTC_50Hz pin to AF0 (default after reset)

       @arg GPIO_AF_MCO: Connect MCO pin (MCO1 and MCO2) to AF0 (default after reset)

       @arg GPIO_AF_TAMPER: Connect TAMPER pins (TAMPER_1 and TAMPER_2) to AF0 (default after reset)

       @arg GPIO_AF_SWJ: Connect SWJ pins (SWD and JTAG)to AF0 (default after reset)

       @arg GPIO_AF_TRACE: Connect TRACE pins to AF0 (default after reset)

       @arg GPIO_AF_TIM1: Connect TIM1 pins to AF1

       @arg GPIO_AF_TIM2: Connect TIM2 pins to AF1

       @arg GPIO_AF_TIM3: Connect TIM3 pins to AF2

       @arg GPIO_AF_TIM4: Connect TIM4 pins to AF2

       @arg GPIO_AF_TIM5: Connect TIM5 pins to AF2

       @arg GPIO_AF_TIM8: Connect TIM8 pins to AF3

       @arg GPIO_AF_TIM9: Connect TIM9 pins to AF3

       @arg GPIO_AF_TIM10: Connect TIM10 pins to AF3

       @arg GPIO_AF_TIM11: Connect TIM11 pins to AF3

       @arg GPIO_AF_I2C1: Connect I2C1 pins to AF4

       @arg GPIO_AF_I2C2: Connect I2C2 pins to AF4

       @arg GPIO_AF_I2C3: Connect I2C3 pins to AF4

       @arg GPIO_AF_SPI1: Connect SPI1 pins to AF5

       @arg GPIO_AF_SPI2: Connect SPI2/I2S2 pins to AF5

       @arg GPIO_AF_SPI3: Connect SPI3/I2S3 pins to AF6

       @arg GPIO_AF_I2S3ext: Connect I2S3ext pins to AF7

       @arg GPIO_AF_USART1: Connect USART1 pins to AF7

       @arg GPIO_AF_USART2: Connect USART2 pins to AF7

       @arg GPIO_AF_USART3: Connect USART3 pins to AF7

       @arg GPIO_AF_UART4: Connect UART4 pins to AF8

       @arg GPIO_AF_UART5: Connect UART5 pins to AF8

       @arg GPIO_AF_USART6: Connect USART6 pins to AF8

       @arg GPIO_AF_CAN1: Connect CAN1 pins to AF9

       @arg GPIO_AF_CAN2: Connect CAN2 pins to AF9

       @arg GPIO_AF_TIM12: Connect TIM12 pins to AF9

       @arg GPIO_AF_TIM13: Connect TIM13 pins to AF9

       @arg GPIO_AF_TIM14: Connect TIM14 pins to AF9

       @arg GPIO_AF_OTG_FS: Connect OTG_FS pins to AF10

       @arg GPIO_AF_OTG_HS: Connect OTG_HS pins to AF10

       @arg GPIO_AF_ETH: Connect ETHERNET pins to AF11

       @arg GPIO_AF_FSMC: Connect FSMC pins to AF12

       @arg GPIO_AF_OTG_HS_FS: Connect OTG HS (configured in FS) pins to AF12

       @arg GPIO_AF_SDIO: Connect SDIO pins to AF12

       @arg GPIO_AF_DCMI: Connect DCMI pins to AF13

       @arg GPIO_AF_EVENTOUT: Connect EVENTOUT pins to AF15

4.使用GPIO_ReadInputData(GPIO_TypeDef* GPIOx)和GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)读输入信号
5.使用GPIO_SetBits()/GPIO_ResetBits()设置输出引脚
6.上电或复位后，引脚备用功能都没启用（JTAG引脚除外），为悬浮输入状态
7.LSE引脚OSC32_IN 和OSC32_OUT（PC14 and PC15）的优先级高于GPIO
8.HSE引脚OSC_IN/OSC_OUT （PH0 / PH1）的优先级高于GPIO

stm32f407 GPIO_PinAFConfig 函数

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