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OPM mode of Tim1 triggered by TIM4 is working strangely.

Question asked by km shim on Apr 3, 2018

1. Target board: STM32F407G-DISC1(MB997D)

2. Timer 1 and 4 configuration

Timer 1 configuration

3. Probing PE9 for OPM of TIM1

why 1st pwm is not working?

Is it impossible to use timer by this manner?