Time1死区时间

yinghuajf_0215

定时器1输出互补PWM波形，不加死区时输出波形频率及占空比都正常。加上死区时间后，测量死区时间与计算的死区时间不相符
void PWM_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;

//开启TIM和相应端口时钟
//启动GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA  | RCC_APB2Periph_GPIOB,
                       ENABLE);
//启动AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//启动TIM1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

//GPIO做相应设置，为AF输出          //PA8，PB13一组互补输出  A9，PB14一组互补输出
//PA.8/9口设置为TIM1的OC1输出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//PB.13/14口设置为TIM1_CH1N和TIM1_CH2N输出口
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOA, GPIO_Pin_8 | GPIO_Pin_9);
GPIO_SetBits(GPIOB, GPIO_Pin_13 | GPIO_Pin_14);
//Step3. TIM模块初始化
  
    //TIM1基本计数器设置（设置PWM频率）1KHz
    TIM_BaseInitStructure.TIM_Period = 1000-1;   //1000HZ
    TIM_BaseInitStructure.TIM_Prescaler = 72-1;
    TIM_BaseInitStructure.TIM_ClockDivision = 0;
    TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
    TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
    //启用ARR的影子寄存器（直到产生更新事件才更改设置）
    TIM_ARRPreloadConfig(TIM1, ENABLE);

    //TIM1_OC1模块设置（设置1通道占空比）
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set; 
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
    TIM_OCInitStructure.TIM_Pulse = 500;
    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

    //启用CCR1寄存器的影子寄存器（直到产生更新事件才更改设置）
    TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);


    //TIM1_OC2模块设置（设置2通道占空比）
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 680;
    TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    //启用CCR2寄存器的影子寄存器（直到产生更新事件才更改设置）
    TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
   
    //OCx输出信号与参考信号相同，只是它的上升沿相对参考信号的上升沿有一个延迟
//OCxN输出信号与参考信号相同，只是它的上升沿相对参考信号的下降沿有一个延迟
   
    //死区设置
    TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
    TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
    TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_OFF;
    //bit7~5 = 111,则deadtime = (32 + (bit4~bit0)* 16*1/fosc)ns = (32+31)*16*1/72000000 = 14us
TIM_BDTRInitStructure.TIM_DeadTime = 0xFF; //这里调整死区大小0-0xff    死区最大14us
    TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
    TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
    TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
    TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
   
    //TIM1开启
    TIM_Cmd(TIM1, ENABLE);
    //TIM1_OC通道输出PWM（一定要加）
    TIM_CtrlPWMOutputs(TIM1, ENABLE);
}

当TIM_BDTRInitStructure.TIM_DeadTime = 0xFF时，计算死区时间为14us，实际测量值为255us，
当TIM_BDTRInitStructure.TIM_DeadTime = 0x80时，计算死区时间为1.777us，实际测量值为128us，

请问各位大神，这个什么原因？？？

yinghuajf_0215

不好意思，用MKD模拟仿真时，出现上面的结果，实际用示波器测量与计算的死区时间是一致。
当TIM_BDTRInitStructure.TIM_DeadTime = 0xFF时，计算死区时间为14us，实际测量值为14us，
当TIM_BDTRInitStructure.TIM_DeadTime = 0x80时，计算死区时间为1.777us，实际测量值为1.77us，

yinghuajf_0215

如果设置 TIM_BaseInitStructure.TIM_ClockDivision =TIM_CKD_DIV2时

当TIM_BDTRInitStructure.TIM_DeadTime = 0xFF时，死区时间为28us
当TIM_BDTRInitStructure.TIM_DeadTime = 0x80时，死区时间为3.554us

lrx9999

yinghuajf_0215 发表于 2014-12-26 09:31
不好意思，用MKD模拟仿真时，出现上面的结果，实际用示波器测量与计算的死区时间是一致。
当TIM_BDTRInitSt ...

请问是什么原因呢？MDK仿真会出问题吗？