How to get 32.768kHz clock time from CIQ?

I am using ANT Time sync to get very accurate timing data from a lap trigger. The accuracy is better than 1ms.

using the ANT.Message.timestamp, I can get the time stamp of the received ANT message generated off a 32.768kHz clock, but this is read some short time after the ANT event. I know that I can use System.getTimer to get current milliseconds but can't see how to get the time offset between the two.

Is there a way to get the 32.768kHz clock time outside of using Message.timestamp?

0 jim_m_58 over 5 years ago

You can't. ms is the best you can do.

0 Barney over 5 years ago in reply to jim_m_58

Hi Jim. Is there a away I can suggest this as a new feature?

My tests have shown that difference in msg.timestamp and Sys.getTimer() can vary by +/-0.15s. ANT has an inbuilt way of synchronising timing within 1ms, through ANT timesync for example, so there is a massive loss in timing resolution which could be solved quite simply within the ConnectIQ SDK. There are ways to approximate (for example, look for minimum timing difference betwen getTimer and timestamp) but there is always some uncertainty.

Our application is velodrome lap timing, so the loss in timing resolution is very significant.

0 jim_m_58 over 5 years ago in reply to Barney

You could try doing a bug report for a feature request.