【正文】 int8_t GPIO_AF)GPIO_AFSelection: selects the pin to used as Alternate function. * This parameter 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_SPI4: Connect SPI4 pins to AF5 * @arg GPIO_AF_SPI5: Connect SPI5 pins to AF5 * @arg GPIO_AF_SPI6: Connect SPI6 pins to AF5 * @arg GPIO_AF_SAI1: Connect SAI1 pins to AF6 for STM32F42xxx/43xxx devices. * @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_UART7: Connect UART7 pins to AF8 * @arg GPIO_AF_UART8: Connect UART8 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_FMC: Connect FMC pins to AF12 for STM32F42xxx/43xxx devices. * @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_LTDC: Connect LTDC pins to AF14 for STM32F429xx/439xx devices. * @arg GPIO_AF_EVENTOUT: Connect EVENTOUT pins to AF15三．系統(tǒng)配置控制器里面的功能看用戶手冊(cè)，可能用不到，IO補(bǔ)償，以太網(wǎng)的模式選擇，內(nèi)存等的映射四．中斷和事件設(shè)置搶占式優(yōu)先級(jí)和響應(yīng)優(yōu)先級(jí)當(dāng)兩個(gè)中斷源的搶占式優(yōu)先級(jí)相同時(shí)，這兩個(gè)中斷將沒有嵌套關(guān)系，當(dāng)一個(gè)中斷到來后，如果正在處理另一個(gè)中斷，這個(gè)后到來的中斷就要等到前一個(gè)中斷處理完之后才能被處理。如果這兩個(gè)中斷同時(shí)到達(dá)，則中斷控制器根據(jù)他們的響應(yīng)優(yōu)先級(jí)高低來決定先處理哪一個(gè)；如果他們的搶占式優(yōu)先級(jí)和響應(yīng)優(yōu)先級(jí)都相等，則根據(jù)他們?cè)谥袛啾碇械呐盼豁樞驔Q定先處理哪一個(gè)void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup){}@param NVIC_PriorityGroup: specifies the priority grouping bits length. * This parameter can be one of the following values: * @arg NVIC_PriorityGroup_0: 0 bits for preemption priority * 4 bits for subpriority（0個(gè)搶占 16個(gè)響應(yīng)015） * @arg NVIC_PriorityGroup_1: 1 bits for preemption priority * 3 bits for subpriority * @arg NVIC_PriorityGroup_2: 2 bits for preemption priority * 2 bits for subpriority（4個(gè)搶占，4個(gè)響應(yīng) 03 ，03） * @arg NVIC_PriorityGroup_3: 3 bits for preemption priority * 1 bits for subpriority * @arg NVIC_PriorityGroup_4: 4 bits for preemption priority * 0 bits for subpriority根據(jù)中斷枚舉結(jié)構(gòu)體初始化中斷外設(shè)void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct){}typedef struct{ uint8_t NVIC_IRQChannel。 //選擇對(duì)哪個(gè)中斷進(jìn)行操作 uint8_t NVIC_IRQChannelPreemptionPriority。 //設(shè)置中斷搶占優(yōu)先級(jí) uint8_t NVIC_IRQChannelSubPriority。 //設(shè)置中斷響應(yīng)優(yōu)先級(jí) FunctionalState NVIC_IRQChannelCmd。 //是否使能中斷選擇ENABLE or DISABLE} NVIC_InitTypeDef。typedef enum IRQn{/****** CortexM4 Processor Exceptions Numbers ****************************************************************/ NonMaskableInt_IRQn = 14, /*! 2 Non Maskable Interrupt */ MemoryManagement_IRQn = 12, /*! 4 CortexM4 Memory Management Interrupt */ BusFault_IRQn = 11, /*! 5 CortexM4 Bus Fault Interrupt */ UsageFault_IRQn = 10, /*! 6 CortexM4 Usage Fault Interrupt */ SVCall_IRQn = 5, /*! 11 CortexM4 SV Call Interrupt */ DebugMonitor_IRQn = 4, /*! 12 CortexM4 Debug Monitor Interrupt */ PendSV_IRQn = 2, /*! 14 CortexM4 Pend SV Interrupt */ SysTick_IRQn = 1, /*! 15 CortexM4 System Tick Interrupt *//****** S