同一个定时器的不同通道产生的PWM不同步。

2019-10-11 16:56发布

同一个定时器的不同通道产生的PWM不同步。我是用TIM1的CH1、CH2，结果发现波形不同步怎么回事？？麻烦看一下：@正点原子
这是我的定时器还有PWM的配置：
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void TIM1_Mode_Init(void)
{

TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_OCInitTypeDef  TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

/*定时器初始化*/
Channel1Pulse = 0;//初始化，没有任何pwm输出
Channel2Pulse = 0;

  TIM_TimeBaseStructure.TIM_Prescaler = 12;       //设置用来作为TIM 时钟频率除数的预分频值
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器模式  /* 向上计数模式 */
  TIM_TimeBaseStructure.TIM_Period = 999;       //自动重装载寄存器周期的值
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;                //时钟分割不分频
//  TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;       //设置周期计数值
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);

/*TIM1 配置*/
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;          //脉冲宽度调制模式2
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;       //使能输出比较状态
  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; //使能  互补输出状态

  TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;             //给1通道填入初始值
  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; //给2通道填入初始值

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;       //输出比较极性低
  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;//互补输出极性低
  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; //MOE=0 设置 TIM1输出比较空闲状态
  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;//MOE=0 重置 TIM1输出比较空闲状态

//  TIM_OCInitStructure.TIM_Pulse = Channel2Pulse; //给2通道填入初始值

  TIM_OC1Init(TIM1, &TIM_OCInitStructure);//设定1通道好的参数初始化TIM
  TIM_OC1Init(TIM8, &TIM_OCInitStructure);//设定1通道好的参数初始化TIM

  TIM_OC2Init(TIM1, &TIM_OCInitStructure);//初始化
  TIM_OC2Init(TIM8, &TIM_OCInitStructure);//初始化

/*设置刹车特性  死区时间  锁电平 OSSI OSSR 状态 AOE(自动输出使能)*/
  TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;  //设置在运行模式下非工作状态选项 OSSR
  TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;  //设置在运行模式下非工作状态选项 OSSI
  TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;  //使用锁电平1
  TIM_BDTRInitStructure.TIM_DeadTime = 80; //指定了输出和打开关闭状态之间的延时约 400ns
  TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;//自动输出功能使能

  TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure); //初始化设定好的参数
  TIM_BDTRConfig(TIM8, &TIM_BDTRInitStructure); //初始化设定好的参数

  /* TIM1 counter enable */
  TIM_Cmd(TIM1, ENABLE);
  TIM_Cmd(TIM8, ENABLE);

  /* Main Output Enable */
  TIM_CtrlPWMOutputs(TIM1, ENABLE);
  TIM_CtrlPWMOutputs(TIM8, ENABLE);

}

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