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:
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:
Specific configuration information of FTM2:
Looking forward to your reply, thank you.
LF
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:
We hope this resolves your issue.
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
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
