三个引脚上拉输入，常开接地，开关闭合触发中断，但是发现在上升沿的时候也会触发，找不到原因。请求解答！
#include "stm32f10x.h"
#include "Delay.h"
void GPIO_AB_Init(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
//GPIOB.5
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource5);
EXTI_InitStructure.EXTI_Line=EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//下降沿
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//GPIOB.6
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource6);
EXTI_InitStructure.EXTI_Line=EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
//GPIOB.7
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB,GPIO_PinSource7);
EXTI_InitStructure.EXTI_Line=EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line5) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
EXTI_ClearITPendingBit(EXTI_Line5);
}
else if(EXTI_GetITStatus(EXTI_Line6) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
EXTI_ClearITPendingBit(EXTI_Line6);
}
else if(EXTI_GetITStatus(EXTI_Line7) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
EXTI_ClearITPendingBit(EXTI_Line7);
}
}
还有一个PWM输出配置。
#include "stm32f10x.h" // Device header
void PWM_Init(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_InternalClockConfig(TIM2);
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_Period = 10 - 1; //ARR T
TIM_TimeBaseInitStructure.TIM_Prescaler = 7200 - 1; //PSC
TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStructure);
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCStructInit(&TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 5; //CCR
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM2, DISABLE);
}
在你的代码中，你将外部中断的触发方式设置为了EXTI_Trigger_Falling，即下降沿触发。所以在下降沿的时候会触发中断。
如果你只想在开关闭合的时候触发中断，可以将触发方式修改为EXTI_Trigger_Rising，即上升沿触发。修改方法如下：
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
这样就只会在上升沿触发中断了。
【以下回答由 GPT 生成】
问题出在EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;这行代码中。EXTI_Trigger_Falling表示下降沿触发中断，而你希望在上升沿时不触发中断。所以需要将其改为EXTI_Trigger_Rising，即上升沿触发中断。
以下是修改后的代码：
void EXTIX_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
// GPIOB.5
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource5);
EXTI_InitStructure.EXTI_Line = EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; // 修改为上升沿触发中断
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
修改完后，上升沿就不会触发中断了。
【相关推荐】
该回答通过自己思路及引用到GPTᴼᴾᴱᴺᴬᴵ搜索,得到内容具体如下：
问题出在上升沿触发的外部中断配置上。在EXTI9_5_IRQHandler函数中，当检测到上升沿触发时，会立即执行TIM_Cmd(TIM2, DISABLE)，这会导致中断服务程序执行完后，定时器立即被禁用，无法产生有效的PWM输出。
为了解决这个问题，你可以在EXTI9_5_IRQHandler函数中添加一个标志位，用于判断是否需要禁用定时器。当检测到上升沿触发时，将标志位设置为1，然后在中断服务程序的最后根据标志位决定是否禁用定时器。同时，需要修改NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority的值，将其设置为0，以确保抢占优先级为0的中断不会被响应。
修改后的代码如下：
#include "stm32f10x.h"
volatile uint8_t disable_tim = 0; // 添加一个标志位
void EXTI9_5_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line5) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
disable_tim = 1; // 设置标志位
}
else if (EXTI_GetITStatus(EXTI_Line6) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
disable_tim = 1; // 设置标志位
}
else if (EXTI_GetITStatus(EXTI_Line7) == SET)
{
Delay_ms(10);
TIM_Cmd(TIM2, DISABLE);
disable_tim = 1; // 设置标志位
}
}
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) // 检查定时器更新中断
{
if (disable_tim == 0) // 如果标志位为0，清除中断并启用定时器
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
TIM_Cmd(TIM2, ENABLE);
}
}
}
这样，在检测到上升沿触发时，会执行EXTI9_5_IRQHandler中断服务程序，设置标志位并禁用定时器。在定时器更新中断处理函数TIM2_IRQHandler中，会根据标志位决定是否清除中断并启用定时器。这样就可以避免在上升沿触发时误关闭定时器的问题。
如果以上回答对您有所帮助，点击一下采纳该答案～谢谢
更改中断触发方式：
如果你只想在下降沿触发中断，可以将 EXTI_InitStructure.EXTI_Trigger 设置为 EXTI_Trigger_Falling，这是你已经在代码中做的事情。
如果你只想在上升沿触发中断，将 EXTI_InitStructure.EXTI_Trigger 设置为 EXTI_Trigger_Rising。
使用软件去抖动：
为了避免噪声或抖动导致多次触发中断，你可以在中断处理函数中添加软件去抖动，例如在中断触发后延迟一段时间再执行实际的中断处理，以确保信号稳定。