CC1310: CC1310/CC1312, timestamp/timestamp2 overflow

user4841866

Part Number: CC1310

Hi,

I have a question about timers. I use the TI15.4 stack in FH mode with speed 5kbps(cc1310 - sensor example, cc1312 - collector example). I calculate the timestamp of received message with the equation: ts = (timestamp*800)/16 + timestamp2/4. Is this the correct calculation? I would like to know the delay from the received message so i calculate with the equation: delay = RF_getCurrentTime()/4 - ts. The problem occurs with the timers overflow. The max value of RF_getCurrentTime() function is 4 294 967 295. What is the max value for timestamp and timestamp2? And how can I calculate this delay correctly with overflow in the calculation?

Thank you in advance for your reply.

over 5 years ago

0 Ammar N over 5 years ago

TI__Mastermind 25810 points

Hello,

It looks like timestamp (in terms of backoffs) and timestamp2 (in terms of MAC timer units) are the same time in different units.

If you look in smsgs.h, you can find the avgE2EDelay which is passed in from the MAC. This sounds like what you are trying to do.

Hope this helps.

0 user4841866 over 5 years ago in reply to Ammar N

Prodigy 230 points

Hi,

I want to do a more accurate sync, so I would need the information how I can calculate by considering the overflow. avgE2EDelay is not useful to me. Can you tell me what is the max value for timestamp and timestamp2?

Thanks for your reply

0 Ammar N over 5 years ago in reply to user4841866

TI__Mastermind 25810 points

Hello,

The following thread does a good job of summarizing the timestamps you are referring to: https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz/f/156/t/839444?CCS-CC1310-RF-getCurrentTime-pDataInd-timestamp-pDataInd-timestamp2-

The max possible values for timestamp and timestamp2 are governed by their size (timestamp is 32 bit, timestamp2 is 16 bit), if that's what you're looking for.

Sub-1 GHz

Sub-1 GHz forum

CC1310: CC1310/CC1312, timestamp/timestamp2 overflow