S32KのトピックExample usage CMU_FM_1 (without using MCAL)

Example usage CMU_FM_1 (without using MCAL)

abemat — Wed, 08 Jan 2025 10:00:07 GMT

I would like to enable CMU_FM_1 to monitor the FIRC_CLK frequency, but have a hard time.

Could someone point me to a tutorial or a step by step method to enable the meter? Ideally using RTD 3.0.0 function calls, but direct register accesses may be done as well.

Re: Example usage CMU_FM_1 (without using MCAL)

danielmartynek — Thu, 09 Jan 2025 12:28:50 GMT

Hello @abemat,

The full version of SAF has API for CMU_FM.

https://www.nxp.com/design/design-center/software/functional-safety-software/s32-safety-software-framework-saf-and-safety-peripheral-drivers-spd:SAF

sCheck/srs/sCheck_CmuFmTest.c

It is not present in the evaluation version.

We have also some non-RTD baremetal code that I can share with you privately.

Regards,

Daniel

Re: Example usage CMU_FM_1 (without using MCAL)

narimanelashkar — Wed, 12 Feb 2025 15:04:31 GMT

I tried to enable CMU_FM_1 to monitor the FIRC_CLK frequency and enable the interrupt FMCIE from IER register to be fired after the measurement is completed by these steps:

IP_CMU_1->RCCR = CMU_FM_RCCR_REF_CNT(50);
IP_CMU_1->IER |= CMU_FM_IER_FMCIE_MASK;
IP_CMU_1->GCR |= CMU_FM_GCR_FME_MASK;

But I faced the following behavior that the interrupt was not fired after the completed window and went to power on reset.

Did you face this behavior or something similar like this?