Example usage CMU_FM_1 (without using MCAL)

[abemat]

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.

[narimanelashkar]

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?

[danielmartynek · Accepted solution]

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-fra...

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