stm32 f103 定时器1四路输出pwm 输出有很乱的杂波

路雨潇潇ll · 发表于 2018-3-24 15:04:54

本帖最后由路雨潇潇ll 于 2018-3-24 15:22 编辑

只有第四个通道输出pwm 前三个通道很乱，像pwm但是杂波严重。原子哥和大神帮忙看下，我程序哪个地方出了问题
#include "timer.h"
#include "led.h"

void timer1_init(u16 arr,u16 psc) //高级定时器1中断溢出
{
                     TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
                     NVIC_InitTypeDef NVIC_InitStruct;
                     RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);

      TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up;
      TIM_TimeBaseInitStruct.TIM_Period=arr;
      TIM_TimeBaseInitStruct.TIM_Prescaler=psc;
      TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;  //重复计数设置
      TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStruct);
      // TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
      TIM_ClearFlag(TIM1,TIM_FLAG_Update);
            TIM_ITConfig(TIM1,TIM_IT_Update|TIM_IT_Trigger,ENABLE); //此步必不可少  更新中断源触发中断源

      NVIC_InitStruct.NVIC_IRQChannel=TIM1_UP_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority=1;
      NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
      NVIC_Init(&NVIC_InitStruct);

      TIM_Cmd(TIM1,ENABLE);
}

void TIM1_UP_IRQHandler(void)
{
            if( TIM_GetITStatus(TIM1,TIM_IT_Update)!=RESET)
            {
                              TIM_ClearITPendingBit(TIM1,TIM_IT_Update);
                                       LED0=!LED0;
                     LED1=!LED1;
            }
}
void pwm_init(u16 arr,u16 psc)    //定时器一pwm四路输出  A8 A9 A10 A11 分别对应通道1234
{
            GPIO_InitTypeDef  GPIO_InitStruct;
            TIM_TimeBaseInitTypeDef  TIM_TimeBaseInitStruct;
            TIM_OCInitTypeDef  TIM_OCInitStruct;


            RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE|RCC_APB2Periph_TIM1|RCC_APB2Periph_AFIO,ENABLE);
            GPIO_PinRemapConfig(GPIO_FullRemap_TIM1,ENABLE);
      //       RCC_APB1PeriphClockCmd();

            GPIO_InitStruct.GPIO_Pin=GPIO_Pin_9|GPIO_Pin_11|GPIO_Pin_13|GPIO_Pin_14;
      GPIO_InitStruct.GPIO_Mode=GPIO_Mode_AF_PP;
      GPIO_InitStruct.GPIO_Speed=GPIO_Speed_50MHz;
            GPIO_Init(GPIOE,&GPIO_InitStruct);

            TIM_TimeBaseInitStruct.TIM_Period=arr;
      TIM_TimeBaseInitStruct.TIM_Prescaler=psc;
      TIM_TimeBaseInitStruct.TIM_ClockDivision=TIM_CKD_DIV1;
      TIM_TimeBaseInitStruct.TIM_CounterMode=TIM_CounterMode_Up;
      TIM_TimeBaseInitStruct.TIM_RepetitionCounter=0;
      TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInitStruct);

//       TIM_OCInitStruct.TIM_OCIdleState=
            TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;
//       TIM_OCInitStruct.TIM_OCNIdleState=
//       TIM_OCInitStruct.TIM_OCNPolarity=
            TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High; //tim输出比较极性高
//       TIM_OCInitStruct.TIM_OutputNState=    //互补输出使能1
            TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
//       TIM_OCInitStruct.TIM_Pulse=
            TIM_OC1Init(TIM1,&TIM_OCInitStruct);
            TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);

            TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;
            TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High;
            TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
            TIM_OC2Init(TIM1,&TIM_OCInitStruct);
            TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);

            TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;
            TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High;
            TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable;
            TIM_OC3Init(TIM1,&TIM_OCInitStruct);
            TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);


            TIM_OCInitStruct.TIM_OCMode=TIM_OCMode_PWM1;
            TIM_OCInitStruct.TIM_OCPolarity=TIM_OCPolarity_High ;
            TIM_OCInitStruct.TIM_OutputState=TIM_OutputState_Enable ;
            TIM_OC4Init(TIM1,&TIM_OCInitStruct);
            TIM_OC4PreloadConfig(TIM1,TIM_OCPreload_Enable);

            TIM_CtrlPWMOutputs(TIM1,ENABLE);
            TIM_ARRPreloadConfig(TIM1,ENABLE);
            TIM_Cmd(TIM1,ENABLE);
}