FTM PWM Synchronization：Hardware Trigger

Scorpio — Tue, 03 Jun 2025 02:42:18 GMT

I am trying to get a better understanding of how the FTM syncronization works using a hardware trigger(TRIG1).

I have already set the SYNCMODE=1, HWTRIGMODE=1, HWWRBUF=1, TRIG1=1 and CNTMAX=1 in FTM0 registers. The FTM0 is in combine mode.

I have also enable the FTM1( Frequency is one-third of FTM0) interrupt to set the SIM_FTMOPT1[FTM1SYNCBIT]=1 and prepare FTM0 CnV register buffer values.

With my understanding, After receiving the FTM1 synchronization signal(SIM_FTMOPT1[FTM1SYNCBIT]=1), FTM0 should update CnV register with the buffer value. However, it does not work according to my expectations and the CnV register does not change.

I am wondering if my understanding of how this works is correct?

How to use the TRIG1(SIM_FTMOPT1[FTM1SYNCBIT]) correctly and When is the sync bit reset to zero?

Thanks for the answer.

Re: FTM PWM Synchronization：Hardware Trigger

_Leo_ — Tue, 03 Jun 2025 22:35:18 GMT

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

Please refer to 4.3.4. Updating FTM registers by hardware trigger—hardware synchronization section of AN5303: Features and Operation Modes of FlexTimer Module on S32K and to its respective associated file AN5303SW.

Test it with the following SW:
- S32 Design Studio (S32DS) for ARM 2.2
- S32 Software Development Kit (SDK) for S32K1xx 3.0.3

I hope this information is helpful.

Best regards,
Leonardo

topic Re: FTM PWM Synchronization：Hardware Trigger in S32K

FTM PWM Synchronization：Hardware Trigger

Re: FTM PWM Synchronization：Hardware Trigger