S32KのトピックRe: set the system clock from program

set the system clock from program

pierpaolo_dini — Tue, 21 Jul 2020 08:26:52 GMT

Hello, everybody,
I am using the can_pal example for nxp s32k144 and would like to know how to change the system clock explicitly.
I saw that in flex_Can you can use a Normal_Model_80 (or similar) function, but I don't see it in can_pal.
Can you tell me how to make explicit whether to run at 80Mhz or 112Mhz ?
Thank you in advance.

Re: set the system clock from program

victorjimenez — Thu, 23 Jul 2020 21:09:37 GMT

Hello Pierpaolo,

You can change the frequency of the system clock directly in the Processor Expert clock component.

Regards,

Victor

Re: set the system clock from program

pierpaolo_dini — Wed, 29 Jul 2020 12:32:32 GMT

Hi Victor,

First of all, thank you for your answer.

However, I don't understand where I can explain that my code can run in normal or highspeed mode.

Also because from the component inspector I can't change the frequency value (48 MHz for Normal Mode and 112MHz for High Speed are values that I can't decide).

I mean that in the SYS_CLK row of the interface clocks table I can't change the values indicated (at least I think it doesn't give me any option and I don't do it).

Maybe in the table below (Clock Sources) I can change the values. But if I try, it shows me a lot of Warnings (?).

Thanks for your attention,

Pierpaolo.

Re: set the system clock from program

victorjimenez — Thu, 30 Jul 2020 17:48:24 GMT

Hello Pierpaolo,

Please refer to the following community thread: https://community.nxp.com/thread/537933

Regards,

Victor

Re: set the system clock from program

Jeremy_He — Fri, 31 Jul 2020 01:56:37 GMT

Hi Pierpaolo，

1. How to set HSRUN mode?

Please add a new component in Processor Expert and new a Power mode configurations as below.

Then in the code call ROWER_SYS_Setmode, and fill in the power mode index which indicates the HSRUN mode, in my case it's 1.

2. How to set RUN mode to 80MHZ from 48MHZ?

Please set SPLL_CLK - Multiply to 40 and choose SYS_CLK RUN mode to SPLL_CLK/2.

3. How to know your current system clock frequency?

You can use the clock output feature.

In PIN_MUX component you can set maxim 4 pins as clock output

Then go to clock manager component, choose the clock source you want to monitor

Hope it will help. Any question please feel free to reply.