There is a microsecond level delay when capturing the input signal of S32K142W chip

[FAR1234]

Dear NXP experts,

Background of the problem:
MCU: S32K142W;
Application background: Configure FTM2 as capture mode to capture three-phase Hall signals for BLDC motor control.
Problem description: Adding an instruction to reverse GPIO at the input of the FTM2_Ch0uCh1_IRQHandler() interrupt function, it was found that the capture trigger time can be delayed by up to 3.2us compared to the captured signal. As shown in the following figure:

FAR1234_0-1758591800978.png

CH1 channel (yellow waveform): FTM2 captures interrupt reversal IO port;
CH2 channel (blue waveform): periodic square wave generated by the signal generator;

My FTM2 configuration is as follows:
Configure reference information, refer to this image:

FAR1234_1-1758592041830.png

Specific configuration information of FTM2:

FAR1234_2-1758592108532.png

FAR1234_3-1758592141480.png

Looking forward to your reply, thank you.

LF

[_Leo_]

Thank you for your interest in our products and for contributing to our community.

Maybe the CPU is attending another interrupt, set priority according to your needs:

_Leo__0-1758652929514.png

We hope this resolves your issue.

[FAR1234]

Hi @_Leo_ 

I am glad to receive your reply.

I only set the interrupt priority of "FTM2_Ch0_Ch1_IRQHandler" to the highest priority 0, and tested again, the fault still persists. As shown in the following figure:The maximum delay time reaches 3.115us

FAR1234_0-1758676563751.png

CH1 channel (yellow waveform): FTM2 captures interrupt reversal IO port;
CH2 channel (blue waveform): periodic square wave generated by the signal generator;

According to my configuration, can you retest it on your end to see if it is normal?

Best regards

LF

[FAR1234]

Hi @_Leo_ 

Have you made any progress on this issue?
We look forward to your reply.

Best regards

LF