STM32F4学习笔记之GPIO(使用固件库)
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1.使能GPIO的AHB时钟，使用函数：RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);
2.配置GPIO工作模式用GPIO_Init()函数
数据类型说明
typedef struct
{
uint32_t GPIO_Pin; //引脚配置
GPIOMode_TypeDef GPIO_Mode; //GPIO_Mode_IN(输入),GPIO_Mode_OUT（输出）,GPIO_Mode_AF （备用）,GPIO_Mode_AN（模拟）
GPIOSpeed_TypeDef GPIO_Speed;// GPIO_Speed_2MHz，GPIO_Speed_25MHz，GPIO_Speed_50MHz，GPIO_Speed_100MHz
GPIOOType_TypeDef GPIO_OType; // GPIO_OType_PP（推挽）,GPIO_OType_OD（开漏）GPIOPuPd_TypeDef GPIO_PuPd; GPIO_PuPd_NOPULL（无），GPIO_PuPd_UP（上拉），GPIO_PuPd_DOWN（下拉）
}GPIO_InitTypeDef;
3.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