Output comparison pulse problem

[hao]

On the stm32h750, I want to use 4 channels to implement pwm waves with different phases in the output comparison mode of tim8. Chanel's mode selection switches on match. The stages are 0% 25% 50% 75%. When the phase is zero (sConfigOC.Pulse = 1-1), the waveform does not flip, while other channels flip according to the set phase.

 

This post has been translated from Chinese to comply with the ST Community guidelines.

[Sarra.S]

Hello @hao, welcome to ST community, 

Could you share your TIM8 configuration? 

[hao]

My configuration in tim8 is as follows

[Sarra.S]

Hello @hao, 

For channel1, the counter starts at 0 and immediately matches the compare value (0) -since it's configured as toggle on match- then the counter starts counting up (to reach 999), there is no further match within the same period, and the output remains in its toggled state

Is that clear?