CCS/CC1310: RF_getCurrentTime() & (pDataInd->timestamp / pDataInd->timestamp2)

Paolo Pedrotti

Part Number: CC1310

Tool/software: Code Composer Studio

Dear TI,
we have implemented a wireless synchronization method with TU15.4 stack with an accuracy in the order of a couple of ms.
At this time we have to compare a timestamp got with RF_getCurrentTime() with the timestamp of the pDataInd structure.

The problem is that the timestamp of the pDataInd struct seems to overflow at 0x2FFFFF in unit of 100us: "t1 = (pDataInd->timestamp * 80 + pDataInd->timestamp) / 400"
while "t2 = RF_getCurrentTime() / 400" at 10737418 (uint32 / 400 ----> unit of 100us)

If "t1 < t2" then we apply the correction for the overflow of t1: "t2 = t2 % 0x2FFFFF". But when t2 overflows the two timestamps will not be align anymore. Is there any way to get t1 of the same size of t2?

Thank you very much
Best regards

over 5 years ago

0 Alexis Crandall20 over 5 years ago

TI__Genius 15590 points

Hi Paolo,

We will look into this and get back to you by the end of the week.

Thanks,

Alexis

0 Ryan Brown1 over 5 years ago

TI__Guru**** 210987 points

Hi Paolo,

Please review the following E2E threads and let us know if any help resolve your issue:

https://e2e.ti.com/support/wireless-connectivity/zigbee-and-thread/f/158/t/736993
https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/836363
https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/637395
https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/788952

Regards,
Ryan

0 Paolo Pedrotti over 5 years ago in reply to Ryan Brown1

Prodigy 70 points

Dear Ryan,
I have already read these threads.

At this time we are using two variables which track the the two timestamp and they are incremented each time in order to keep under control the overflow.
This in not a good solution but we do not know any other way to have one timestamp in the same unit of the other.

Do you also know if there is any way to get the timestamp of the sent message? The dataCnfCb seems to be triggered when the TI15.4 stack has received an ack from the destination of the message. We are trying to get the best synchronization accuracy and precise timestamp are mandatory, we are also sending broadcast message for the time synchronization (https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/837012?tisearch=e2e-sitesearch&keymatch=%20user%3A421277

Thank you very much

0 Ryan Brown1 over 5 years ago in reply to Paolo Pedrotti

TI__Guru**** 210987 points

Hi Paolo,

dataCnfCb does trigger when the MAC ACK is received, however the timestamps included contain information regarding the transmitted frame. Keep in mind that dataCnfCb can also return a ApiMac_status_noAck status.

Regards,
Ryan

Sub-1 GHz

Sub-1 GHz forum

CCS/CC1310: RF_getCurrentTime() & (pDataInd->timestamp / pDataInd->timestamp2)