TIM1的PWM输出时有时没有

1万 · 2021-8-14 12:09

使用的是STM32F103C8T6，使用的TIM1的PWM输出，还有TIM3的PWM输出，程序下载完后，TIM1的pwm一直没有输出，tim3的pwm一直有输出

1万 · 2021-8-14 12:12

什么意思？不是很明白你说的什么，能再解释一下这个现象吗

1万 · 2021-8-14 12:14

需要在主函数里面先初始化tim1再初始化tim3

1万 · 2021-8-14 12:16

试了,tim1有了pwm输出，但是重新上电后tim1又没有PWM输出了

1万 · 2021-8-14 12:18

又重新烧写tim1又可以输出PWM了，但是重新上电依然没有

只看该作者 · 2021-8-14 12:20

楼主程序可以公开吗？贴程序看下吧，这么说看不出什么原因

1万 · 2021-8-14 12:22

void TIM3_Configuration(void) //PWM2 ch2    PWM3 ch3
{
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
                     TIM_OCInitTypeDef  TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);
TIM_TimeBaseStructure.TIM_Period=99;
TIM_TimeBaseStructure.TIM_Prescaler= 22;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel2 */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse  = 20;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC2Init(TIM3, &TIM_OCInitStructure);
  TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel2 */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse  = 20;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC3Init(TIM3, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM3, ENABLE);

  TIM_Cmd(TIM3, ENABLE);
}

void Timer_init(void)
{
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
      TIM_OCInitTypeDef  TIM_OCInitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  /* Time base configuration */
  TIM_TimeBaseStructure.TIM_Period = 99;
  TIM_TimeBaseStructure.TIM_Prescaler = 22;//3089;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  /* PWM1 Mode configuration: Channel2 */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

  TIM_OCInitStructure.TIM_Pulse  = 20;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

  /* PWM1 Mode configuration: Channel2 */
      TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
      //TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse  = 20;
      TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
  TIM_OC3Init(TIM1, &TIM_OCInitStructure);
  TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);

  TIM_ARRPreloadConfig(TIM1, ENABLE);

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

void NVIC_Configuration(void)
{
      NVIC_InitTypeDef NVIC_InitStructure;
      NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);


NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);


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

      /*CAN--USB_LP_CAN1_RX0_IRQn*/
      NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;                //ÏÈÕ¼ÓÅÏÈ¼¶0,´ÓÓÅÏÈ¼¶0
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

      /*USART2*/
      NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
      NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;                //ÏÈÕ¼ÓÅÏÈ¼¶0,´ÓÓÅÏÈ¼¶1
      NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
      NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
      NVIC_Init(&NVIC_InitStructure);

}

1万 · 2021-8-14 12:24

不管是初始化1还是3都可以的；
没有先后的说法；

1万 · 2021-8-14 12:26

程序仿真下看看呗：监控相应的定时器寄存器有没有使能；

1万 · 2021-8-14 12:28

监控了是没问题了，但是没有输出

1万 · 2021-8-14 12:30

1万 · 2021-8-14 12:39

ST官方例程关于定时器PWM输出的很多，也很完整。你参考下。

2万 · 2021-8-14 12:40

调试时，注意不用因为手动操作寄存器而忘写具体的程序代码。

2万 · 2021-8-14 12:42

这样就会出现调试OK，下载重启后不正常。

1万 · 2021-8-14 12:45

楼主没下载F1CUBE？

1万 · 2021-8-14 12:46

没有下载啊，不过这也是一种办法了，谢谢

1万 · 2021-8-14 12:50

这个文件里面有很多例子。但是要注册ST网站的账号才可以下载。

1万 · 2021-8-14 12:52

基本可以确认仅就他的问题，上面代码是看不出问题的。

2万 · 2021-8-14 12:54

问题可能出在别的地方。

1万 · 2021-8-14 12:56

比方相关中断里是否对定时器1的输出做了什么；