topic Re: Question about BCTU CL in S32K

Question about BCTU CL

CKing — Thu, 10 Aug 2023 08:48:52 GMT

Hello,

In S32K3xx, if I want to do a sequence of conversion on one ADC, I can use BCTU CL to configure a sequence and BCTU will trigger ADC multiple times, or I can configure NCMRn/JCMRn to wait for a normal/injected trigger. Is the saying right?

Thanks

Re: Question about BCTU CL

Robin_Shen — Sun, 13 Aug 2023 02:01:44 GMT

Hi CK,

Sorry I may not understand your question.
Section 61.3.4.2 Operation modes in normal conversions of S32K3XXRM(Rev.7) mentions that you can use One-Shot mode or Scan mode to implement sequential conversion.

Section 65.3.2 Conversion list (CL) of S32K3XXRM mentions:
A CL executes a sequence of conversions on one or more target ADCs. It also stores information from the last conversion executed in a sequence except for the target ADC, which is stored in ADC select n (TRGCFG_m[ADC_SELn]).

So I think either ADC normal conversions or BCTU CL can be used to sample a sequence of ADC channels.

Best Regards,
Robin
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Re: Question about BCTU CL

CKing — Mon, 14 Aug 2023 03:59:48 GMT

Hi Robin,

Thanks for your information. I am curious about the flexibility to execute a sequence conversion.

Using CL to sample a sequence of channels is used in BCTU conversion mode. The BCTU conversion mode has the highest priority's trigger and sends one trigger to start one conversion in CL.

If I use NCMR/JCMR, only one trigger is required for a sequence conversion. However the sequence must follow the ascending order of channels to sample.

Therefore, there is not a way to start a sequence of normal conversion in any order which only requires a trigger. That is my question.

Thanks

Re: Question about BCTU CL

Robin_Shen — Thu, 17 Aug 2023 02:04:29 GMT

61.3.4 Normal trigger
Proceed through the standard input channels in ascending order.

Unfortunately I didn't find which register to start a sequence of normal conversion in any order which only requires a trigger.