#include "timer2.h"
#include "led.h"
#include "usart.h"
void TIM2_Int_Init(u16 arr,u16 psc)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        NVIC_InitTypeDef NVIC_InitStructure;

        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM6, ENABLE);

        TIM_TimeBaseStructure.TIM_Period = arr;
        TIM_TimeBaseStructure.TIM_Prescaler =psc;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

        TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );

        NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;  
        NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
        NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
        NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
        NVIC_Init(&NVIC_InitStructure);
        TIM_Cmd(TIM2, ENABLE);  
                                                         
}

void TIM2_IRQHandler(void)  
{
        if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
                {
                TIM_ClearITPendingBit(TIM2, TIM_IT_Update  );  
                LED1=!LED1;
                }
}

void TIM2_PWM_Init(u16 arr,u16 psc)
{  
        GPIO_InitTypeDef GPIO_InitStructure;
        TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
       
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  | RCC_APB2Periph_AFIO|RCC_APB2Periph_GPIOB, ENABLE);
       
        GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2, ENABLE);
       

        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        TIM_TimeBaseStructure.TIM_Period = arr;
        TIM_TimeBaseStructure.TIM_Prescaler =psc;
        TIM_TimeBaseStructure.TIM_ClockDivision = 0;
        TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
        TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
       
        //3õê¼»ˉTIM3 Ch` annel2 PWMÄ￡ê½         
        TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
        TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
        TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
        TIM_OC3Init(TIM2, &TIM_OCInitStructure);

        TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Disable);  

        TIM_Cmd(TIM2, ENABLE);
         
}

程序仿照原子哥的，想换个定时器输出，结果不行，其他3个通用定时器都试过都OK，就是定时器3不行，通道都有换过，拜托各位帮我看看哪里不行