stm32中输出独立的PWM波和外部中断会干扰？

[一个渣渣的世界]

#include "pbdata.h"

void RCC_Configuration(void);
void GPIO_Configuration(void);
void TIM3_Configuration(void);
void NVIC_Configuration(void);
void EXTI_Configuration(void);
void USART_Configuration(void);

int fputc(int ch,FILE *f)
{
USART_SendData(USART1,(u8)ch);
while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET);
return ch;
}

int main(void)
{
RCC_Configuration();
GPIO_Configuration();
EXTI_Configuration();
NVIC_Configuration();
TIM3_Configuration();
USART_Configuration();

TIM_SetCompare2(TIM3,360);
while(1)
{
}

}


void RCC_Configuration(void)
{
SystemInit();

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7;//PWM输出
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_5; //外部中断
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;//TX,PA.9
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_10;//RX,PA.10
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_All;//²¢ÐÐÊý¾Ý¿ÚPC.All
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}

void TIM3_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
TIM_OCInitTypeDef TIM_OCInitStructure;


TIM_TimeBaseStruct.TIM_Period=799;//³õÖµ
TIM_TimeBaseStruct.TIM_Prescaler=99;
TIM_TimeBaseStruct.TIM_ClockDivision=0;
TIM_TimeBaseStruct.TIM_CounterMode=TIM_CounterMode_Up;//ÏòÉÏ
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStruct);

TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OC2Init(TIM3,&TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3,TIM_OCPreload_Enable);

TIM_Cmd(TIM3,ENABLE);
}


void EXTI_Configuration(void)
{
EXTI_InitTypeDef EXTI_InitStructure;

EXTI_ClearITPendingBit(EXTI_Line5);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource5);

EXTI_InitStructure.EXTI_Line=EXTI_Line5;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;

EXTI_Init(&EXTI_InitStructure);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

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 USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;

USART_InitStructure.USART_BaudRate=9600;
USART_InitStructure.USART_WordLength=USART_WordLength_8b;
USART_InitStructure.USART_StopBits=USART_StopBits_1;
USART_InitStructure.USART_Parity=USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl=USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;

USART_Init(USART1,&USART_InitStructure);
USART_Cmd(USART1,ENABLE);
USART_ClearFlag(USART1,USART_FLAG_TC);


}


外部中断的中断服务程序
void EXTI9_5_IRQHandler(void)
{
u16 ReadValue=0;
if(EXTI_GetITStatus(EXTI_Line5)==SET)
{
if(GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_5)==Bit_RESET)
{
ReadValue =GPIO_ReadInputData(GPIOB);
printf("%d\r\n",ReadValue);
}
EXTI_ClearITPendingBit(EXTI_Line5);
delay_ms(10);
}
}
问题是PWM波无法输出，去掉外部中断程序后才可以输出，但是这两个应该是独立的，现在有了干扰，不知道应该如何改。EXTI9_5这个通道我改为EXTI3，依然不能出波形。外部中断是由一个方波输入的，通过GPIOA_5产生下降沿时进中断程序

[默寞]

void EXTI9_5_IRQHandler(void)里面delay_ms(10);去掉 中断里面严禁加延时 中断里面严禁加延时 中断里面严禁加延时 重要的事情说三遍

[可乐714]

中断中禁止延时，和长时间的程序运行，中断函数只是用来处理一些简单的程序，可以改变标志位之类的简单函数。禁止延时，禁止延时，禁止延时

[一个渣渣的世界]

问题已经弄清楚了，不是延时的问题，是printf();函数不能在中断程序中运行，否则程序会死在中断里。 改变方法有两个：1.去掉printf();，在中断里定义flag，并将flag=1;然后再在主函数的while()里用printf(); 程序：while(1) { if (flag==1) { printf("%d\r\n",ReadValue); flag=0; } } 2.在#include "pbdata.h"下面加上一段话 #pragma import(__use_no_semihosting) _sys_exit(int x) { x = x; } struct __FILE { int handle; /* Whatever you require here. If the only file you are using is */ /* standard output using printf() for debugging, no file handling */ /* is required. */ }; /* FILE is typedef’ d in stdio.h. */ FILE __stdout;