RTOS/TM4C1294KCPDT: Clock Source for var Seconds

John Griffith

Part Number: TM4C1294KCPDT
Other Parts Discussed in Thread: SYSBIOS

Tool/software: TI-RTOS

Hello,

I have a customer that is using the TM4C1294 and has a question about using a clock source other than the 32khz crystal for the Seconds variable. Message from the engineer:

Have a question on TI-RTOS config file item:

var Seconds=xdc.useModule('ti.sysbios.hal.Seconds');

It appears that this uitlizes the HIB timer for implementation, however, we do not have a 32kHz crystal connected to the hardware. (From \arm\lm4\Seconds.c) Is it possible to use a different source for the clock on this? The .cfg file item:

var Clock = xdc.useModule('ti.sysbios.knl.Clock');

Works well and returns values I would expect using - Clock_getTicks(), is there a way to use this as the clock source for Seconds? Seconds is used by WolfSSL TLS capability…

Thanks in advance!

John

over 6 years ago

0 Sean Oliver28 over 6 years ago

TI__Intellectual 1060 points

Hi John,

This thread may have the solution you are looking for:

http://e2e.ti.com/support/legacy_forums/embedded/tirtos/f/355/t/584288

You can plug your own function to be called when the RTOS tries to get/set the time in Seconds. You should be able to substitute Clock calls in these functions you provide. I used the code snippet in the link, but please note there is a small typo: ('.SetFxn' should be '.setFxn'). I got it to work with a similar platform (E4), where Seconds_get simply returns Clock_getTicks:

Let me know if this works for you!

Thanks,

Sean

0 John Griffith over 6 years ago in reply to Sean Oliver28

TI__Mastermind 21831 points

Hi Sean,

Thanks for the super quick response. I just shared this with the engineer I am working with and I will let you know if they have any additional questions. I will close the thread if this answers the question.

Thanks again,

John

0 Sean Oliver28 over 6 years ago in reply to John Griffith

TI__Intellectual 1060 points

Hi John,

Just checking in. Have you heard anything back from your colleague?

Thanks,

Sean

0 John Griffith over 6 years ago in reply to Sean Oliver28

TI__Mastermind 21831 points

Hi Sean,

Thanks for following up. The engineer was having an issue getting a WolfSSA library to compile with our RTOS and hasn't been able to test this. Sorry for the delay.

John

0 ToddMullanix over 6 years ago in reply to John Griffith

TI__Guru* 96960 points

Hi John,

I'm going to mark this as TI Thinks Resolved. If you determine it is not, just cancel the request and add a reply. If the thread gets locked (due to 2 weeks of no activity), just start a new thread and reference this one.

Todd

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RTOS/TM4C1294KCPDT: Clock Source for var Seconds