Kinetis Microcontrollers中的主题 Re: KEAZ128-FTM2 input capture to measure two pulse

KEAZ128-FTM2 input capture to measure two pulse

cqhcau — Sat, 19 Jun 2021 01:11:43 GMT

I what to measure the time interval of rising edge of two pulses with CH0 and CH1 of FTM2.

As the figure below,the yellow line and the bule line. FTM2 clock is 40M.

When there is only one blue pulse , I could measure the time interval corretly.

But when there are there blue pulses, I what measure the rising edge of yellow pulse and the first

rising edge of bule pulse, the result is the yellow pulse and the third blue pulse. I can't measure the

the rising edge of yellow pulse and the first rising edge of bule pulse.I have tried to set the filter of CH0

and CH1 with different values,but no work. How to solve this problem?

Re: KEAZ128-FTM2 input capture to measure two pulse

Robin_Shen — Wed, 30 Jun 2021 01:55:44 GMT

Hi cqhcau,

We can continue to discuss in your post. Have you tried disable the input capture once you read the first value of C2V?

Best Regards,
Robin
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Re: KEAZ128-FTM2 input capture to measure two pulse

cqhcau — Wed, 30 Jun 2021 06:30:47 GMT

I have tried to disable the input capture Isr of CH1(with CHIE) in the Isr handler,but no use.

Do you mean to disable the CH1 capture with DECAPEN,COMBINE,CPWMS,MSnb:Msna ?

Re: KEAZ128-FTM2 input capture to measure two pulse

Marianna25 — Wed, 30 Jun 2021 06:53:30 GMT

Can you please provide me your response on the above issues or can we connect over a call for a better demonstration of the issues.

Regards,

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