CC2652R: Using Network Time Synchronization OpenThread API on CC2652R device configured as sleepy end device (SED)

Sanket Doshi

Part Number: CC2652R

Hi,

I currently used CC2652R for one of my OpenThread application as sleepy end device. I am currently exploring options to synchronize the devices time and have found that Open Thread does have an API that could be used to synchronize time among nodes. Using this information i did the following with SDK libraries:

1. configured "OPENTHREAD_CONFIG_ENABLE_TIME_SYNC" macro to '1' to enable the feature

2. OpenThread MTD library failed to compile when i used "otNetworkTimeGet" function from network_time.h

3. Fixed compile issue on this function and now i am stuck with not being able to find "time.c" file. The compile fails for this reason as it could not locate the function "otPlatTimeGet" which is declared under "time.h" file.

Here is the question:

is this feature supported by TI OpenThread SDK? if yes where can i find the files i am looking for? or any more information on this will be helpful...

Thanks,

Sanket

over 5 years ago

0 Toby over 5 years ago

TI__Mastermind 35030 points

Hi,

As of the latest SDK (4.10), this feature is not supported.

The functions in time.h would need to be implemented in some file, say time.c.

This is similar, for example, to the openthread platform file timer.cpp using function otPlatAlarmMicroGetNow, which is defined in alarm_micro.c (e.g. in the imported CCS project temp_sensor_CC26X2R1_LAUNCHXL_tirtos_ccs\platform\).
In fact, otPlatAlarmMicroGetNow may probably be used as a reference for creating otPlatTimeGet, since both functions have the same description ("The current time in microseconds.".

Regards,
Toby

0 Sanket Doshi over 5 years ago in reply to Toby

Prodigy 60 points

Hi,

Thanks for the response!

Just curious as to which clock this function must use, Would it be RTC or any other system clock? In other words any information on which clock would the network time synchronization feature will get/modify etc..

Thanks,

Sanket

0 Toby over 5 years ago in reply to Sanket Doshi

TI__Mastermind 35030 points

Yes, this would be RTC.

You could use the same function calls as shown in alarm_micro.c

0 Sanket Doshi over 5 years ago in reply to Toby

Prodigy 60 points

Thank You!

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CC2652R: Using Network Time Synchronization OpenThread API on CC2652R device configured as sleepy end device (SED)