Pwm input capture mode in stm32H7 MCU

Forum|Forum|8 years ago
April 22, 2018
1 reply
1510 views

Posted on April 22, 2018 at 05:41

HELLO..

I want to measure the frequency and duty cycle of the external signal. I have gone through some example available , and suggestions on website. Everywhere they are using either channel 1 or channel 2 in any of timer , unfortunately in my case signal is given to channel 4 , Is it still possible to measure duty cycle and frequency by using channel 4 , if so how to configure the same in stm cubemx ..

Can anybody suggest please , I am fully stuck with this issue ..

Thank you

#pwm-input #stm32h7 #cubemx

This topic has been closed for replies.

Tesla DeLorean

Guru

Posted on April 22, 2018 at 16:06

The PWM Input mode pairs Channel 1 and 2.

You could use Input Capture with Channel 4, and Channel 3 (Indirect) to time stamp TIMx_CH4 along the timeline of TIMx and interrupt. You could then delta measurements in an interrupt (or sample with DMA), to measure the period and duty of an input signal.

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Edwin kausAuthor

Associate III

Posted on April 22, 2018 at 16:45

Hello ..

Thanks for response ..

I am just confused , Can you please give me some more explanation, suggest some example project if possible . In stm example project they used TIM1 channel 1 as direct & channel 2 as indirect mode . I am using TIM 8 CHANNEL 4 for frequency capture and duty cycle measurements.

Suggest me how to configure the tim8 and how calculate duty cycle .

Tesla DeLorean

Guru

Posted on April 22, 2018 at 17:33

Use a free-running timer, use CH3 and CH4 to time-stamp different edges, and subtract values, or prior values.

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