ST HAL库 GPIO例程学习
作者:互联网
首先,查看文件 stm32f4xx_hal_gpio.c 关于如何使用GPIO外设的说明。
##### How to use this driver ##### ============================================================================== [..] (#) Enable the GPIO AHB clock using the following function: __HAL_RCC_GPIOx_CLK_ENABLE(). (#) Configure the GPIO pin(s) using HAL_GPIO_Init(). (++) Configure the IO mode using "Mode" member from GPIO_InitTypeDef structure (++) Activate Pull-up, Pull-down resistor using "Pull" member from GPIO_InitTypeDef structure. (++) In case of Output or alternate function mode selection: the speed is configured through "Speed" member from GPIO_InitTypeDef structure. (++) In alternate mode is selection, the alternate function connected to the IO is configured through "Alternate" member from GPIO_InitTypeDef structure. (++) Analog mode is required when a pin is to be used as ADC channel or DAC output. (++) In case of external interrupt/event selection the "Mode" member from GPIO_InitTypeDef structure select the type (interrupt or event) and the corresponding trigger event (rising or falling or both). (#) In case of external interrupt/event mode selection, configure NVIC IRQ priority mapped to the EXTI line using HAL_NVIC_SetPriority() and enable it using HAL_NVIC_EnableIRQ(). (#) To get the level of a pin configured in input mode use HAL_GPIO_ReadPin(). (#) To set/reset the level of a pin configured in output mode use HAL_GPIO_WritePin()/HAL_GPIO_TogglePin(). (#) To lock pin configuration until next reset use HAL_GPIO_LockPin(). (#) During and just after reset, the alternate functions are not active and the GPIO pins are configured in input floating mode (except JTAG pins). (#) The LSE oscillator pins OSC32_IN and OSC32_OUT can be used as general purpose (PC14 and PC15, respectively) when the LSE oscillator is off. The LSE has priority over the GPIO function. (#) The HSE oscillator pins OSC_IN/OSC_OUT can be used as general purpose PH0 and PH1, respectively, when the HSE oscillator is off. The HSE has priority over the GPIO function.
(#)使用 __HAL_RCC_GPIOx_CLK_ENABLE() 函数使能GPIO AHB时钟
(#)使用 HAL_GPIO_Init() 函数配置GPIO引脚
(++)使用 GPIO_InitTypeDef 结构体的 Mode 成员,配置 IO 模式
(++)使用 GPIO_InitTypeDef 结构体的 Pull 成员,配置 上拉/下拉操作
(++)使用 GPIO_InitTypeDef 结构体的 Speed 成员,配置 IO 速度(仅限输出模式和复用功能模式)
(++)使用 GPIO_InitTypeDef 结构体的 Alternate 成员,配置 IO 连接的复用功能(仅限复用功能模式)
(++)当引脚作为 ADC 或 DAC 功能使用时,需要配置为 Analog 模式
(++)在外部中断或事件模式下,使用 GPIO_InitTypeDef 结构体的 Mode 成员,选择类型(中断或事件)和对应的触发事件(上升沿或下降沿)
(#)在外部中断或事件模式下,使用 HAL_NVIC_SetPriority() 函数和 HAL_NVIC_EnableIRQ() 函数,设置映射到 NVIC line 上的 NVIC IRQ 优先级
(#)在输入模式下,使用 HAL_GPIO_ReadPin() 函数获取引脚上的电平
(#)在输出模式下,使用 HAL_GPIO_WritePin() 或 HAL_GPIO_TogglePin() 函数配置引脚电平
(#)使用 HAL_GPIO_LockPin() 函数,引脚将被锁住,直到下一次复位
(#)在复位操作和复位操作刚完成后,复用功能无效,所有的引脚配置为输入浮空模式(除了 JTAG 引脚)
(#)当内部 LSE oscillator 关闭时,可以使用 OSC32_IN 和 OSC32_OUT 引脚外接 LSE oscillator (此功能优先级高于GPIO功能)
(#)当内部 HSE oscillator 关闭时,可以使用 OSC_IN 和 OSC_OUT 引脚外接 HSE oscillator(此功能优先级高于GPIO功能)
标签:HAL,引脚,例程,++,mode,InitTypeDef,GPIO 来源: https://www.cnblogs.com/xing-2/p/16457316.html