AM2434: After configuring the Timer according to the set period, clock jitter occurs during actual testing in the AM2434.

Nana Tang

Part Number: AM2434

Background: Find this problem used the SDK version is the mcu_plus_sdk_am243x_08_05_00_24;

Question1:

1. When using TIME2 as the timer clock for interrupt 8k in the R50-0 core, testing revealed jitter phenomena of 125us, 126us, and even 124us.

The configuration of the Timer2 shown as followed:

So why the jitter occurred?

Question2:

I found that the cycle calculation of the timer in the latest version of the MCU_SDK, which is mcu_plus_sdk_am243x_09_01_00_41, is different from the one I used, which is 243x_08_05_00_24. I would like to ask why such changes were made.

The interface TimerP_setup defined in the TimeP.c of the two version:

Question 3:

Would the changes in problem 2 be a solution to problem 1?？？

over 1 year ago

0 Vaibhav Kumar over 1 year ago

TI__Mastermind 31004 points

Hello Nana Tang,

Thanks for your elaborate question.

Please allow me sometime to get back on this.

Regards,

Vaibhav

0 Vaibhav Kumar over 1 year ago

TI__Mastermind 31004 points

Hello Nana Tang,

Nana Tang said:
1. When using TIME2 as the timer clock for interrupt 8k in the R50-0 core, testing revealed jitter phenomena of 125us, 126us, and even 124us.

Can you send us a more clear image of this ?

Is this behavior of jitter noticeable across both mcu plus sdk versions 8_05_00_24 and 09_01_00_41 ?

There seems to be reasonable amount of bug fixes in the 09_01_00_41 release over the previous releases. I would encourage you to use the latest SDK.

https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/09_01_00_41/exports/docs/api_guide_am243x/RELEASE_NOTES_09_01_00_PAGE.html

Regards,

Vaibhav

0 Nana Tang over 1 year ago in reply to Vaibhav Kumar

Prodigy 20 points

Hello Vaibhav Kumar:

Thank you for your reply.

1. I can share the more clear image as followed:

Can you see the image more clear?

The behavior occurred in the sdk versions 8_05_00_24, the 09_01_00_41 I havn't test it.

2. About the sdk version:

Since our current engineering projects are all using version 08_05, and we are stable and iterating within this version. If we switch to the latest version, it will definitely bring a lot of workload and potential problems and conflicts. So I would like to ask if there is a solution to this problem within the current version?

Regards.