关于TIMER1输出PWM波形 周期的问题 大家帮我看看

satankiller2008

void Tim1_PWM_Config(uint16_t duty_circle1, uint16_t duty_circle2, double deadtime, uint16_t cycle)

{

double deadtime_tmp = 0;

TimerPeriod = (SystemCoreClock / 20000) - 1;  

Channel1Pulse = TimerPeriod / 2;

Channel2Pulse = TimerPeriod / 3;

Channel3Pulse = TimerPeriod / 4;

Channel4Pulse = TimerPeriod / 5;

/* Time Base configuration */  

    TIM_TimeBaseStructure.TIM_Prescaler = 0; 

    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

TIM_TimeBaseStructure.TIM_Period = TimerPeriod - 1;  

    TIM_TimeBaseStructure.TIM_ClockDivision = 0;  

    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;

TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

/* Channel 1, 2 and 3 Configuration in PWM mode */  

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;

TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;

TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;

 

    TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable; 

    TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;    

    TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset; 

    TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;   

    

    TIM_OC1Init(TIM1, &TIM_OCInitStructure);

      

    TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;

    TIM_OC2Init(TIM1, &TIM_OCInitStructure); 

    TIM_OCInitStructure.TIM_Pulse = Channel3Pulse; 

    TIM_OC3Init(TIM1, &TIM_OCInitStructure);  

TIM_OCInitStructure.TIM_Pulse = Channel4Pulse;  

    TIM_OC4Init(TIM1, &TIM_OCInitStructure); 

    /* TIM1 counter enable */  

    TIM_Cmd(TIM1, ENABLE);

  

    /* Main Output Enable */  

    TIM_CtrlPWMOutputs(TIM1, ENABLE);

}

satankiller2008

周期按道理8400分频应该是50us  示波器测量确是56us....求大家帮帮忙 谢谢了

satankiller2008

有没有人啊

hechao3225

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如果要50us,TIM_Period=3599，
Tout=（3599+1）*1/72000000=50us,


但是楼主你这个里的是TimerPeriod=(72000000/20000)-1-1=3598;
说明你的示波器测的还蛮精确的。。

satankiller2008

回复【4楼】hechao3225:
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额。。。。我看看。。。。。先谢谢