I am a beginner in STM32. I have been confused about PWM and I am not sure about the mode and polarity of PWM. Not long ago, I suddenly realized it. I searched for him in the crowd for thousands of times, but when I looked back, he was in the dim light.
In fact, it is very simple to figure it out. Before talking about PWM mode, we need to know the counter CNT. For example, in the up counting mode, CNT counts from 0 to the set period value. There is also a register CCRx used to determine the high and low level dividing line. In this way, we can know that the PWM period is determined by the period value of the timing, and the high and low duty cycles are determined by the CRRx value.
There are two modes of PWM, PWM1 mode: CNT
that it is determined by the output polarity of TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; The effective level plus the output polarity equals when to output a high level and
when to output a low level.
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