S32KのトピックRe: S32K3 PWM measure

S32K3 PWM measure

kjy106906 — Mon, 30 May 2022 02:50:58 GMT

Hello. I have a question.

I want to measure odd number of data waveforms.

I hope to measure the waveform through the EMIOS ICU.
The values I set are as follows.
Measurement mode: ICU Mode Signal Measurement
Measurement property: ICU Duty Cycle

When the measurement is carried out, the duty and period in the red square box are measured.

(400 ticks, 600 ticks) (active time, period)
However, the last data is not measurable.

Is there any way to measure that data?
For example:

(400,400),(0,200), (300,300)

Thank you

Re: S32K3 PWM measure

PetrS — Tue, 31 May 2022 13:19:07 GMT

Hi,

as far as I understand driver code, in this mode it does not return 3rd and 4th edge, active time duration (first 2 edgess) in tics is returned and a period is calculated from 2nd and 4th edge. You will probably need to select edge detect mode and read value for each edge.

BR, Petr

Re: S32K3 PWM measure

kjy106906 — Thu, 02 Jun 2022 01:49:32 GMT

Thanks for the reply @PetrS
Is it possible to measure duty and period even in edge detect mode?
(I think duty and period can only be measured in ICU_MODE_SIGNAL_MEASUREMENT.)
Is there a way to measure the duty and period of odd number of data as in the question above?

Re: S32K3 PWM measure

PetrS — Tue, 07 Jun 2022 08:23:35 GMT

Hi,

if having captured values for each edge you can calculate duty cycle/period yourself.
ICU_MODE_SIGNAL_MEASUREMENT does not return values for bunch of 2 edges you outlined.

BR, Petr

Re: S32K3 PWM measure

kjy106906 — Tue, 07 Jun 2022 08:30:49 GMT

Thanks for the reply @PetrS

sorry. I didn't understand
Please explain in more detail about "if having captured values for each edge you can calculate duty cycle/period yourself"

Best Regards

Re: S32K3 PWM measure

PetrS — Thu, 16 Jun 2022 12:01:07 GMT

Hi,

in edge mode, you should get a notification for each edge and you can read captured value of the timer and save it for later. Collecting all four edges you can calculate signal parameters.

BR, Petr