【STM32 Cotex-M3处理器系列编程】外部按键中断
#include "stm32f10x.h" unsigned int tt; tt=6553500; if(EXTI_GetITStatus(EXTI_Line5)!=RESET) { } //配置IO口 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE,ENABLE);//IO口使能设置 GPIO_InitTypeDef GPIO_InitStructure; //定义结构体 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //设置为上拉输入 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOE, &GPIO_InitStructure); //配置外部中断控制器 EXTI_InitTypeDef EXTI_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);//使能时钟 EXTI_InitStructure.EXTI_Line = EXTI_Line5; //使用IO口5作为中断口 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //设置EXTI线路为中断请求 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //下降沿触发 EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource5);//将PE5挂接到EXTI9_5_IRQn中断源上 //配置中断控制器 NVIC_InitTypeDef NVIC_InitStructure; NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //选择中断组0 NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //指定中断源,0-4管脚属于EXTI0_IRQn~EXTI4_IRQn,5-9管脚属于EXTI9_5_IRQn,10-15管脚属于EXTI15_10_IRQn //NVIC_InitStructure.NVIC_IRQChannelPreemptionPrio rity = 3; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//无先占优先级,从优先级为1 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); while(1); while (1) { }
unsigned int TimingDelay;
void Delay(unsigned int x)
{
TimingDelay=x;
while(TimingDelay--);
}
void EXTI9_5_IRQHandler(void) //中断处理函数
{
GPIO_SetBits(GPIOC, GPIO_Pin_7);
while(tt--);
GPIO_ResetBits(GPIOC, GPIO_Pin_7);
while(tt--);
EXTI_ClearFlag(EXTI_Line5);//清除中断标志
EXTI_ClearITPendingBit(EXTI_Line5);//清除EXTI线路挂起位
}
int main(void)
{
}
//以下是报错函数
#ifdef USE_FULL_ASSERT
void assert_failed(uint8_t* file, uint32_t line)
{
}
#endif
关键词: STM32Cotex-M3按键中

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