stm32 io输入中断
在这个示例中，我们使用GPIOA的Pin 0作为输入引脚，并在下降沿触发时生成中断。在中断处理程序中，您可以执行任何您希望在按下按钮时发生的操作。请根据您的具体要求在EXTI0_IRQHandler函数中编写代码。
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_exti.h"
#include "stm32f10x_rcc.h"
#include "misc.h"#define BUTTON_PIN GPIO_Pin_0
#define BUTTON_PORT GPIOA
#define BUTTON_EXTI_LINE EXTI_Line0
#define BUTTON_IRQn EXTI0_IRQnvoid EXTI0_IRQHandler(void)
{if (EXTI_GetITStatus(BUTTON_EXTI_LINE) != RESET){// 处理中断事件// ...EXTI_ClearITPendingBit(BUTTON_EXTI_LINE);}
}void init_GPIO()
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);GPIO_InitTypeDef GPIO_InitStructure;GPIO_InitStructure.GPIO_Pin = BUTTON_PIN;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(BUTTON_PORT, &GPIO_InitStructure);
}void init_EXTI()
{RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);EXTI_InitTypeDef EXTI_InitStructure;EXTI_InitStructure.EXTI_Line = BUTTON_EXTI_LINE;EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; // 下降沿触发EXTI_InitStructure.EXTI_LineCmd = ENABLE;EXTI_Init(&EXTI_InitStructure);NVIC_InitTypeDef NVIC_InitStructure;NVIC_InitStructure.NVIC_IRQChannel = BUTTON_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);
}int main(void)
{init_GPIO();init_EXTI();while (1){// 主循环中的其他操作// ...}
}