CMP Round Robin in Run mode for S32K148

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CMP Round Robin in Run mode for S32K148

1,022 Views
kart
Contributor I

Hi,

Is there any Example reference code for using CMP Round Robin mode in Run mode.

I want to monitor 3 Channel inputs(INP) and compare with the Dac reference voltage(INN).

Is it possible to monitor the CMP_C2[CHnF] and CMP_C2[ACOn] in the ISR of Round Robin to identify the Change of input state for individual channels?

When CMP_C2[RRIE] is enabled, Is there a separate ISR for the CMP Round Robin similar to CMP0_IRQn?

Thanks,

kart

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3 Replies

1,006 Views
Robin_Shen
NXP TechSupport
NXP TechSupport

Hi kart,

Please refer: Example S32K144 CMP Round-robin S32DS2.0
Hope it helps.

Best Regards,
Robin
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983 Views
kart
Contributor I

Hi Robin,

The Example uses the VLPS mode and LPTMR clock source is used for Comparator round robin clock.

Can we use Round robin mode in RUN mode with SIRC clock source for Comparator round robin clock?

 

Round Robin implementation is discussed in "45.1.5 CMP trigger mode" of S32K Reference Manual "https://www.nxp.com/webapp/Download?colCode=S32K1XXRM" 

Last 2 steps in Round robin implementation are explained as follows:

kart_0-1645065772397.png

I do not want to use the Low power mode as discussed in (3) and use a different clock other than LPTMR as shown in (2).

Thanks

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964 Views
Robin_Shen
NXP TechSupport
NXP TechSupport

Hi kart,

I am sorry to tell you that the CMP round robin/trigger mode is available only if the MCU is STOP1 or VLPS and LPTRM must be used to trigger the CMP comparisons.

I am afraid you need to implement the round robin in software with CMP module and an additional timer. Based on the overflow interrupt provided by timer you have to change the channel used for comparison and to check if the output value of the CMP matches expected value or not.

Best Regards,
Robin

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