How can I FIRC clock enable(REQ52)?

[malove]

Hello,

I have a question regarding the configuration of the MC_ME module to select the FIRC clock for FlexCAN in S32K314.

[Figure1]

As shown in [Figure1], it is mentioned that the status of the FIRC can be checked through BLOCK52 in MC_ME1.

[Figure2]

In [Figure2], it is shown that the clock for Block52 can be configured.

[Figure3]

However, when I checked the S32K314.h file [Figure3], I couldn't find the bit named REQ52. How can I configure this setting?

[VaneB · Accepted solution]

Hi @malove 

I recommend using RTDs, the software package includes the device header, which have a macros defined that can be used to enable the clocks. 

BR, VaneB

[malove]

thank you!

[malove]

Is there any way to access it without using RTD?

[VaneB]

Hi @malove 

I have compared different versions of development packages and it seems that the headers may vary depending on the version of the development package, could you help me with the information of the version you are using?

[malove]

I'm using S32DS 3.5 and PlatformSDK_S32K3, S32K3XX AUTOSAR 4.4 - R21 - 11 RTD 3.0.0 D2303

Do you need more information?

[VaneB]

Hi @malove 

FIRC is enabled by default and we understand that the Table 260 (MC_ME partition peripheral mapping and clock control) of the RM may lead to the conclusion that FIRC can be enabled like the other clocks (MC_ME->PRTN1_COFB1_CLKEN), but it was found that configure FIRC causes hard fault in run mode with debugger disconnected. Therefore the register was set to reserved.