以下內容在stm32f4xx_gpio.h內

/** @defgroup GPIO_Alternat_function_selection_define 
  * @{
  */ 
/** 
  * @brief   AF 0 selection  
  */ 
#define GPIO_AF_RTC_50Hz      ((uint8_t)0x00)  /* RTC_50Hz Alternate Function mapping */
#define GPIO_AF_MCO           ((uint8_t)0x00)  /* MCO (MCO1 and MCO2) Alternate Function mapping */
#define GPIO_AF_TAMPER        ((uint8_t)0x00)  /* TAMPER (TAMPER_1 and TAMPER_2) Alternate Function mapping */
#define GPIO_AF_SWJ           ((uint8_t)0x00)  /* SWJ (SWD and JTAG) Alternate Function mapping */
#define GPIO_AF_TRACE         ((uint8_t)0x00)  /* TRACE Alternate Function mapping */
#if defined (STM32F446xx)
#define GPIO_AF0_TIM2         ((uint8_t)0x00)  /* TIM2 Alternate Function mapping */
#endif /* STM32F446xx */

/** 
  * @brief   AF 1 selection  
  */ 
#define GPIO_AF_TIM1          ((uint8_t)0x01)  /* TIM1 Alternate Function mapping */
#define GPIO_AF_TIM2          ((uint8_t)0x01)  /* TIM2 Alternate Function mapping */

/** 
  * @brief   AF 2 selection  
  */ 
#define GPIO_AF_TIM3          ((uint8_t)0x02)  /* TIM3 Alternate Function mapping */
#define GPIO_AF_TIM4          ((uint8_t)0x02)  /* TIM4 Alternate Function mapping */
#define GPIO_AF_TIM5          ((uint8_t)0x02)  /* TIM5 Alternate Function mapping */

/** 
  * @brief   AF 3 selection  
  */ 
#define GPIO_AF_TIM8          ((uint8_t)0x03)  /* TIM8 Alternate Function mapping */
#define GPIO_AF_TIM9          ((uint8_t)0x03)  /* TIM9 Alternate Function mapping */
#define GPIO_AF_TIM10         ((uint8_t)0x03)  /* TIM10 Alternate Function mapping */
#define GPIO_AF_TIM11         ((uint8_t)0x03)  /* TIM11 Alternate Function mapping */
#if defined (STM32F446xx)
#define GPIO_AF3_CEC          ((uint8_t)0x03)  /* CEC Alternate Function mapping */
#endif /* STM32F446xx */
/** 
  * @brief   AF 4 selection  
  */ 
#define GPIO_AF_I2C1          ((uint8_t)0x04)  /* I2C1 Alternate Function mapping */
#define GPIO_AF_I2C2          ((uint8_t)0x04)  /* I2C2 Alternate Function mapping */
#define GPIO_AF_I2C3          ((uint8_t)0x04)  /* I2C3 Alternate Function mapping */
#if defined (STM32F446xx)
#define GPIO_AF4_CEC          ((uint8_t)0x04)  /* CEC Alternate Function mapping */
#define GPIO_AF_FMPI2C        ((uint8_t)0x04)  /* FMPI2C Alternate Function mapping */
#endif /* STM32F446xx */

/** 
  * @brief   AF 5 selection  
  */ 
#define GPIO_AF_SPI1          ((uint8_t)0x05)  /* SPI1/I2S1 Alternate Function mapping */
#define GPIO_AF_SPI2          ((uint8_t)0x05)  /* SPI2/I2S2 Alternate Function mapping */
#define GPIO_AF5_SPI3         ((uint8_t)0x05)  /* SPI3/I2S3 Alternate Function mapping (Only for STM32F411xE Devices) */
#define GPIO_AF_SPI4          ((uint8_t)0x05)  /* SPI4/I2S4 Alternate Function mapping */
#define GPIO_AF_SPI5          ((uint8_t)0x05)  /* SPI5 Alternate Function mapping      */
#define GPIO_AF_SPI6          ((uint8_t)0x05)  /* SPI6 Alternate Function mapping      */

/** 
  * @brief   AF 6 selection  
  */ 
#define GPIO_AF_SPI3          ((uint8_t)0x06)  /* SPI3/I2S3 Alternate Function mapping */
#define GPIO_AF6_SPI2         ((uint8_t)0x06)  /* SPI2 Alternate Function mapping (Only for STM32F411xE Devices) */
#define GPIO_AF6_SPI4         ((uint8_t)0x06)  /* SPI4 Alternate Function mapping (Only for STM32F411xE Devices) */
#define GPIO_AF6_SPI5         ((uint8_t)0x06)  /* SPI5 Alternate Function mapping (Only for STM32F411xE Devices) */
#define GPIO_AF_SAI1          ((uint8_t)0x06)  /* SAI1 Alternate Function mapping      */

/** 
  * @brief   AF 7 selection  
  */ 
#define GPIO_AF_USART1         ((uint8_t)0x07)  /* USART1 Alternate Function mapping  */
#define GPIO_AF_USART2         ((uint8_t)0x07)  /* USART2 Alternate Function mapping  */
#define GPIO_AF_USART3         ((uint8_t)0x07)  /* USART3 Alternate Function mapping  */
#define GPIO_AF7_SPI3          ((uint8_t)0x07)  /* SPI3/I2S3ext Alternate Function mapping */

/** 
  * @brief   AF 7 selection Legacy 
  */ 
#define GPIO_AF_I2S3ext   GPIO_AF7_SPI3

/** 
  * @brief   AF 8 selection  
  */ 
#define GPIO_AF_UART4         ((uint8_t)0x08)  /* UART4 Alternate Function mapping  */
#define GPIO_AF_UART5         ((uint8_t)0x08)  /* UART5 Alternate Function mapping  */
#define GPIO_AF_USART6        ((uint8_t)0x08)  /* USART6 Alternate Function mapping */
#define GPIO_AF_UART7         ((uint8_t)0x08)  /* UART7 Alternate Function mapping  */
#define GPIO_AF_UART8         ((uint8_t)0x08)  /* UART8 Alternate Function mapping  */
#if defined (STM32F446xx)
#define GPIO_AF8_SAI2          ((uint8_t)0x08)  /* SAI2 Alternate Function mapping */
#define GPIO_AF_SPDIF         ((uint8_t)0x08)   /* SPDIF Alternate Function mapping */
#endif /* STM32F446xx */

/** 
  * @brief   AF 9 selection 
  */ 
#define GPIO_AF_CAN1          ((uint8_t)0x09)  /* CAN1 Alternate Function mapping  */
#define GPIO_AF_CAN2          ((uint8_t)0x09)  /* CAN2 Alternate Function mapping  */
#define GPIO_AF_TIM12         ((uint8_t)0x09)  /* TIM12 Alternate Function mapping */
#define GPIO_AF_TIM13         ((uint8_t)0x09)  /* TIM13 Alternate Function mapping */
#define GPIO_AF_TIM14         ((uint8_t)0x09)  /* TIM14 Alternate Function mapping */

#define GPIO_AF9_I2C2         ((uint8_t)0x09)  /* I2C2 Alternate Function mapping (Only for STM32F401xx/STM32F411xE Devices) */
#define GPIO_AF9_I2C3         ((uint8_t)0x09)  /* I2C3 Alternate Function mapping (Only for STM32F401xx/STM32F411xE Devices) */
#if defined (STM32F446xx)
#define GPIO_AF9_SAI2         ((uint8_t)0x09)  /* SAI2 Alternate Function mapping */
#endif /* STM32F446xx */
#define GPIO_AF9_LTDC         ((uint8_t)0x09)  /* LTDC Alternate Function mapping */
#if defined (STM32F446xx)
#define GPIO_AF9_QUADSPI      ((uint8_t)0x09)  /* QuadSPI Alternate Function mapping */
#endif /* STM32F446xx */
/** 
  * @brief   AF 10 selection  
  */ 
#define GPIO_AF_OTG_FS         ((uint8_t)0xA)  /* OTG_FS Alternate Function mapping */
#define GPIO_AF_OTG_HS         ((uint8_t)0xA)  /* OTG_HS Alternate Function mapping */
#if defined (STM32F446xx)
#define GPIO_AF10_SAI2         ((uint8_t)0x0A)  /* SAI2 Alternate Function mapping */
#endif /* STM32F446xx */
#if defined (STM32F446xx)
#define GPIO_AF10_QUADSPI      ((uint8_t)0x0A)  /* QuadSPI Alternate Function mapping */
#endif /* STM32F446xx */
/** 
  * @brief   AF 11 selection  
  */ 
#define GPIO_AF_ETH             ((uint8_t)0x0B)  /* ETHERNET Alternate Function mapping */

/** 
  * @brief   AF 12 selection  
  */ 
#if defined (STM32F40_41xxx)
#define GPIO_AF_FSMC             ((uint8_t)0xC)  /* FSMC Alternate Function mapping                     */
#endif /* STM32F40_41xxx */

#if defined (STM32F427_437xx) || defined (STM32F429_439xx) || defined (STM32F446xx)
#define GPIO_AF_FMC              ((uint8_t)0xC)  /* FMC Alternate Function mapping                      */
#endif /* STM32F427_437xx || STM32F429_439xx || STM32F446xx */

#define GPIO_AF_OTG_HS_FS        ((uint8_t)0xC)  /* OTG HS configured in FS, Alternate Function mapping */
#define GPIO_AF_SDIO             ((uint8_t)0xC)  /* SDIO Alternate Function mapping                     */

/** 
  * @brief   AF 13 selection  
  */ 
#define GPIO_AF_DCMI          ((uint8_t)0x0D)  /* DCMI Alternate Function mapping */

/** 
  * @brief   AF 14 selection  
  */
#define GPIO_AF_LTDC          ((uint8_t)0x0E)  /* LCD-TFT Alternate Function mapping */

/** 
  * @brief   AF 15 selection  
  */ 
#define GPIO_AF_EVENTOUT      ((uint8_t)0x0F)  /* EVENTOUT Alternate Function mapping */

#if defined (STM32F40_41xxx)
#define IS_GPIO_AF(AF)   (((AF) == GPIO_AF_RTC_50Hz)  || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_MCO)       || ((AF) == GPIO_AF_TAMPER)    || \
                          ((AF) == GPIO_AF_SWJ)       || ((AF) == GPIO_AF_TRACE)     || \
                          ((AF) == GPIO_AF_TIM1)      || ((AF) == GPIO_AF_TIM2)      || \
                          ((AF) == GPIO_AF_TIM3)      || ((AF) == GPIO_AF_TIM4)      || \
                          ((AF) == GPIO_AF_TIM5)      || ((AF) == GPIO_AF_TIM8)      || \
                          ((AF) == GPIO_AF_I2C1)      || ((AF) == GPIO_AF_I2C2)      || \
                          ((AF) == GPIO_AF_I2C3)      || ((AF) == GPIO_AF_SPI1)      || \
                          ((AF) == GPIO_AF_SPI2)      || ((AF) == GPIO_AF_TIM13)     || \
                          ((AF) == GPIO_AF_SPI3)      || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_USART1)    || ((AF) == GPIO_AF_USART2)    || \
                          ((AF) == GPIO_AF_USART3)    || ((AF) == GPIO_AF_UART4)     || \
                          ((AF) == GPIO_AF_UART5)     || ((AF) == GPIO_AF_USART6)    || \
                          ((AF) == GPIO_AF_CAN1)      || ((AF) == GPIO_AF_CAN2)      || \
                          ((AF) == GPIO_AF_OTG_FS)    || ((AF) == GPIO_AF_OTG_HS)    || \
                          ((AF) == GPIO_AF_ETH)       || ((AF) == GPIO_AF_OTG_HS_FS) || \
                          ((AF) == GPIO_AF_SDIO)      || ((AF) == GPIO_AF_DCMI)      || \
                          ((AF) == GPIO_AF_EVENTOUT)  || ((AF) == GPIO_AF_FSMC))
#endif /* STM32F40_41xxx */

#if defined (STM32F401xx)
#define IS_GPIO_AF(AF)   (((AF) == GPIO_AF_RTC_50Hz)  || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_MCO)       || ((AF) == GPIO_AF_TAMPER)    || \
                          ((AF) == GPIO_AF_SWJ)       || ((AF) == GPIO_AF_TRACE)     || \
                          ((AF) == GPIO_AF_TIM1)      || ((AF) == GPIO_AF_TIM2)      || \
                          ((AF) == GPIO_AF_TIM3)      || ((AF) == GPIO_AF_TIM4)      || \
                          ((AF) == GPIO_AF_TIM5)      || ((AF) == GPIO_AF_TIM8)      || \
                          ((AF) == GPIO_AF_I2C1)      || ((AF) == GPIO_AF_I2C2)      || \
                          ((AF) == GPIO_AF_I2C3)      || ((AF) == GPIO_AF_SPI1)      || \
                          ((AF) == GPIO_AF_SPI2)      || ((AF) == GPIO_AF_TIM13)     || \
                          ((AF) == GPIO_AF_SPI3)      || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_USART1)    || ((AF) == GPIO_AF_USART2)    || \
                          ((AF) == GPIO_AF_SDIO)      || ((AF) == GPIO_AF_USART6)    || \
                          ((AF) == GPIO_AF_OTG_FS)    || ((AF) == GPIO_AF_OTG_HS)    || \
                          ((AF) == GPIO_AF_EVENTOUT)  || ((AF) == GPIO_AF_SPI4))
#endif /* STM32F401xx */

#if defined (STM32F411xE)
#define IS_GPIO_AF(AF)   (((AF) < 16) && ((AF) != 11) && ((AF) != 13) && ((AF) != 14))
#endif /* STM32F411xE */

#if defined (STM32F427_437xx) || defined (STM32F429_439xx)
#define IS_GPIO_AF(AF)   (((AF) == GPIO_AF_RTC_50Hz)  || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_MCO)       || ((AF) == GPIO_AF_TAMPER)    || \
                          ((AF) == GPIO_AF_SWJ)       || ((AF) == GPIO_AF_TRACE)     || \
                          ((AF) == GPIO_AF_TIM1)      || ((AF) == GPIO_AF_TIM2)      || \
                          ((AF) == GPIO_AF_TIM3)      || ((AF) == GPIO_AF_TIM4)      || \
                          ((AF) == GPIO_AF_TIM5)      || ((AF) == GPIO_AF_TIM8)      || \
                          ((AF) == GPIO_AF_I2C1)      || ((AF) == GPIO_AF_I2C2)      || \
                          ((AF) == GPIO_AF_I2C3)      || ((AF) == GPIO_AF_SPI1)      || \
                          ((AF) == GPIO_AF_SPI2)      || ((AF) == GPIO_AF_TIM13)     || \
                          ((AF) == GPIO_AF_SPI3)      || ((AF) == GPIO_AF_TIM14)     || \
                          ((AF) == GPIO_AF_USART1)    || ((AF) == GPIO_AF_USART2)    || \
                          ((AF) == GPIO_AF_USART3)    || ((AF) == GPIO_AF_UART4)     || \
                          ((AF) == GPIO_AF_UART5)     || ((AF) == GPIO_AF_USART6)    || \
                          ((AF) == GPIO_AF_CAN1)      || ((AF) == GPIO_AF_CAN2)      || \
                          ((AF) == GPIO_AF_OTG_FS)    || ((AF) == GPIO_AF_OTG_HS)    || \
                          ((AF) == GPIO_AF_ETH)       || ((AF) == GPIO_AF_OTG_HS_FS) || \
                          ((AF) == GPIO_AF_SDIO)      || ((AF) == GPIO_AF_DCMI)      || \
                          ((AF) == GPIO_AF_EVENTOUT)  || ((AF) == GPIO_AF_SPI4)      || \
                          ((AF) == GPIO_AF_SPI5)      || ((AF) == GPIO_AF_SPI6)      || \
                          ((AF) == GPIO_AF_UART7)     || ((AF) == GPIO_AF_UART8)     || \
                          ((AF) == GPIO_AF_FMC)       ||  ((AF) == GPIO_AF_SAI1)     || \
                          ((AF) == GPIO_AF_LTDC))
#endif /* STM32F427_437xx ||  STM32F429_439xx */

#if defined (STM32F446xx)
#define IS_GPIO_AF(AF)   (((AF) < 16) && ((AF) != 11) && ((AF) != 14))
#endif /* STM32F446xx */

/**
  * @}
  */ 

/** @defgroup GPIO_Legacy 
  * @{
  */
    
#define GPIO_Mode_AIN           GPIO_Mode_AN

#define GPIO_AF_OTG1_FS         GPIO_AF_OTG_FS
#define GPIO_AF_OTG2_HS         GPIO_AF_OTG_HS
#define GPIO_AF_OTG2_FS         GPIO_AF_OTG_HS_FS

/**
  * @}
  */

/**
  * @}
  */