ADC triggers only in rising edge PWM

[oeliks]

Hi! ADC triggers only on rising edge of PWM signal. I want to trigger it at both rising/falling​ edge. When ADC=continous conversions, I can see some samples are 3V some 0V. But its random. So I changed continous conversions=disable.

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Using HAL.​

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Pwm triggers ADC then its transferred to array.​

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TIM3:

Clock 72 MHz

Counting UP​

Prescaler 36-1

Period 10-1

Pulse 5

TRGO update event​

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Pwm=200khz

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​ADC:

Continous mode:disable​

Trigger: TIM3 update event​

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I cant see in cubemx or in code trigger at rising or falling edge.​

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Is there a simple register bit​ to set or Hal configuration to enable this?

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Will try to do it myself, but any help is needed!

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Thank You for your help!​

[oeliks]

Ok, so center aligned mode of TIM3 seem to work.

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​clock 72mhz

Prescaler = 18-1

Period=​10-1

Pulse=5

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WithI pulse=0 there is no pwm generated.

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How to proper set/calculate th​is values? To get 200khz 50% duty pwm?

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On high pulse adc gives 3,28V so its ok, but on low pulse it gives 0,02V.​

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Reading datasheets & searching web. Didnt find much. Pleas help.​