I spent several days trying to get a timer to output a square wave. It worked fine at first, but then it stopped working. I was so frustrated...
After a long period of oscilloscope observation and exploration, I found that the functions of the registers in the ordinary comparison output mode and the PWM mode are different.
Comparison output mode
The characteristic of this mode is that the output cycle frequency of the four channels is the same. The frequency period is determined by the size of the preload register ARR. It is called Counter Period in Cubmx. The larger the value, the lower the output frequency.
But this mode has a feature that the initial phase of each channel can be determined by the CCRx of each channel.
PWM Mode
The frequency length of the waveform cycle is determined by ARR
The duration of the high level is determined by the CCRx of each channel.
The difference between the two modes is that the role of CCRx is different in different modes.
In output comparison mode, CCRx controls the initial phase.
In PWM mode, CCRx controls the high level counting cycle.
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