为什么我的TIM3定时器可以输出PWM,TIM2不能，求大神指教

剑皇

具体的配置如下，求大神指教

#include "pwm.h"
#include "usart.h"

void TIM3_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 NVIC_InitTypeDef NVIC_InitStructure;

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, 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(TIM3, &TIM_TimeBaseStructure); 
 
 TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE );

 NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;  
 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; 
 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;  
 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
 NVIC_Init(&NVIC_InitStructure); 

 TIM_Cmd(TIM3, ENABLE);      
}

 

void TIM2_Int_Init(u16 arr,u16 psc)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 NVIC_InitTypeDef NVIC_InitStructure;

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, 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 TIM3_IRQHandler(void)  
{
 if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) 
  {
  TIM_ClearITPendingBit(TIM3, TIM_IT_Update  );  
  }
}

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

 

void TIM3_PWM_Init(u16 arr,u16 psc)
{ 
 GPIO_InitTypeDef GPIO_InitStructure;
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 TIM_OCInitTypeDef  TIM_OCInitStructure;
 

 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); 
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  | RCC_APB2Periph_AFIO, ENABLE); 

 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; //TIM_CH7
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //???????ì????
 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
 GPIO_Init(GPIOA, &GPIO_InitStructure);//??????GPIO
 
 
 TIM_TimeBaseStructure.TIM_Period = arr;
 TIM_TimeBaseStructure.TIM_Prescaler =psc; 
 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 
 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); 
 
 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
  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);  //????TIM3
}

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, ENABLE); 
 

 
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //TIM_CH2
 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); 
 
 
 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; 
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; 
 TIM_OC2Init(TIM2, &TIM_OCInitStructure); 

 TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);  
 
 TIM_Cmd(TIM2, ENABLE); 
}

lycreturn

关闭TIM3，单独开TIM2的PWM行不

剑皇

还是不可以，现在我改成了用TIM3的两个通道输出PWM