The frequency calculation formula of the PWM wave generated by the output comparison mode of the timer is: 72M/((2*(arr+1))*(psc+1) )
For example, if you set: PWM_Init(1000-1,72-1); (PWM_Init(arr,psc);) then the frequency of each PWM channel is 500Hz.
PWM_Init(arr,psc)
{
TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc;
}
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