CCER寄存器的CC1E位一直在变

2万 · 2023-2-17 20:17

使能通道1TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Enable)后

2万 · 2023-2-17 20:20

TIM1配置：
void TIM_PWM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_InitStruct;
TIM_OCInitTypeDef    TIM_OCInitStruct;
TIM_BDTRInitTypeDef    TIM_BDTRInitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE);
TIM_DeInit(TIM1);

TIM_InitStruct.TIM_Period          = period;
TIM_InitStruct.TIM_Prescaler       = 0;
TIM_InitStruct.TIM_CounterMode       = TIM_CounterMode_Up;
TIM_InitStruct.TIM_ClockDivision    = TIM_CKD_DIV1;
TIM_InitStruct.TIM_RepetitionCounter  = 0;
TIM_TimeBaseInit(TIM1,&TIM_InitStruct);
TIM_ARRPreloadConfig(TIM1,ENABLE);

  TIM_OCInitStruct.TIM_OCMode          = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState    = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStruct.TIM_Pulse    = duty;
TIM_OCInitStruct.TIM_OCPolarity    = TIM_OCPolarity_High;
TIM_OCInitStruct.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStruct.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStruct.TIM_OCNIdleState = TIM_OCNIdleState_Set;

TIM_OC1Init(TIM1,&TIM_OCInitStruct);
TIM_OC2Init(TIM1,&TIM_OCInitStruct);
TIM_OC3Init(TIM1,&TIM_OCInitStruct);

// TIM_BDTRInitStructure.TIM_OSSRState=TIM_OSSRState_Enable;
// TIM_BDTRInitStructure.TIM_OSSIState=TIM_OSSIState_Enable;
// TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
// TIM_BDTRInitStructure.TIM_DeadTime=0x00;
// TIM_BDTRInitStructure.TIM_Break=TIM_Break_Disable;
// TIM_BDTRInitStructure.TIM_AutomaticOutput=TIM_AutomaticOutput_Enable;
// TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);

TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(TIM1,TIM_OCPreload_Enable);
// TIM_ClearITPendingBit(TIM1,TIM_IT_CC1);
TIM_Cmd(TIM1,ENABLE);
TIM_CCPreloadControl(TIM1,DISABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);

}

2万 · 2023-2-17 20:22

那你用示波器看后，实际波形有没有变呢？

1万 · 2023-2-17 20:23

可能你程序哪里一直在更新吧；

2万 · 2023-2-17 20:24

没看明白

2万 · 2023-2-17 20:26

实际波形周期从167us变成2.8us

2万 · 2023-2-17 20:31

TIM_CCPreloadControl(TIM1,DISABLE);改成ENABLE 后正常，但是TIM_CCxCmd(TIM1, TIM_Channel_1, TIM_CCx_Disable);无法关闭通道1比较输出

2万 · 2023-2-17 20:32

这个标志位代表的是什么呢

2万 · 2023-2-17 20:34

这是不是一个使能位呀

1万 · 2023-2-17 20:35

产什么什么不好的后果了吗

1万 · 2023-2-17 20:36

周期为什么会变化这么多啊

1万 · 2023-2-17 20:38

非常正常啊在调试的过程中就是一直在变化的但是不需要太过在意

1万 · 2023-2-17 20:39

不要在调试过程中看寄存器的值那个没有什么参考性

2万 · 2023-2-17 20:41

这个寄存器是干什么用的呢