topic Re: Measure input pulse measure with edge count in S32K

Measure input pulse measure with edge count

elnino — Tue, 08 Apr 2025 08:31:58 GMT

I have configured eMios channel 4 of HW instance 0 as ICU_MODE_SIGNAL_MEASUREMENT.

I am able to read Period, duty with this configuration. But I would like to measure edge/Pulse count as well. So, is it possible to get period and Edge count simultaneously using ICU_MODE_SIGNAL_MEASUREMENT? If not, please guide me to do the same.

Re: Measure input pulse measure with edge count

_Leo_ — Tue, 08 Apr 2025 17:48:44 GMT

Hi,

Thank you so much for your interest in our products and for using our community.

Each eMIOS channel allows just one of the following ICU modes:

ICU_MODE_SIGNAL_EDGE_DETECT
ICU_MODE_EDGE_COUNTER
ICU_MODE_SIGNAL_MEASUREMENT
ICU_MODE_TIMESTAMP

And your seems that your application needs two ICU modes.

What comes to my mind is that you could route the external signal to be measured to a pin configured as trgmux_inX. And then, route its trgmux ouput to a two eMIOS channels. One performing ICU_MODE_SIGNAL_MEASUREMENT and the other one performing
ICU_MODE_EDGE_COUNTER.

Hope it helps you.

Have a nice day!

Re: Measure input pulse measure with edge count

elnino — Thu, 10 Apr 2025 08:51:12 GMT

Thanks for details. Do you have any example code "to route the external signal to be measured to a pin configured as trgmux_inX."

I am not aware of trgmux_inX.

This is my pin configuration for my input PWM.

Re: Measure input pulse measure with edge count

_Leo_ — Tue, 15 Apr 2025 23:48:12 GMT

Hi again,

Please give me more time to give you a proper answer.

Re: Measure input pulse measure with edge count

_Leo_ — Thu, 17 Apr 2025 22:02:48 GMT

Hi again,

Please find attached project.

This example perform two eMIOS ICU modes, PEC (EMIOS_0_CH_5) and IPWM (EMIOS_0_CH_5), in the same pin (PTD2). It is archived routing the same PWM input signal to two eMIOS channels though TRGMUX (trgmux_in5).

The PWM signal is generated using the EMIOS_1_CH_0 (PTA0) in OPWMB mode and using EMIOS_CH_23 in MCB mode as time base.

Please use S32DS 3.6, RTD 5.0.0, S32K3X4EVB-T172 (and connect PTA0 to PTD2).

If you need different SW and/or HW, you can create a new project, do manual config and code copy.

Note -> Although you are able to read period and duty cycle, please consider that IPWM measurements in attached project should be improved, meanwhile please refer to the following community posts:

https://community.nxp.com/t5/S32K-Knowledge-Base/Example-IP-S32K312-EMIO-PWM-Generation-amp-Duty-capture-using/ta-p/2011634

https://community.nxp.com/t5/S32K-Knowledge-Base/Example-IP-S32K312-EMIO-PWM-Generation-amp-Duty-capture-using/ta-p/2011642

Hope it helps you.

Have a nice day!