How to access the TIMER3 in wireless timer sync?

[Michael01101]

Hello,

I found this great blog entry about synchronizing timers on different devices: https://devzone.nordicsemi.com/nordic/short-range-guides/b/bluetooth-low-energy/posts/wireless-timer-synchronization-among-nrf5-devices

It works just fine on a nRF52840DK and a nRF52DK. Timers on multiple nRF5 devices are synced by one device (master) sending sync packets containing captured timer values to other devices (nodes). (TIMER3 is free running, TIMER2 counts TIMER3 overflows).

At the moment I am struggeling to access this synchronized TIMER3 on the two boards. I am familiar with setting up a TIMER without wireless timer sync. 

So here are my questions:

1. How can I define CC, Prescaler, Mode, Bitmode, the interrupt handler and so forth when using wireless timer sync?

2. Can anybody provide me some advice how to access this synchronized TIMER3 properly? 

Thank you very much in advance.

[Michael01101]

Hello again Audun,

do you have any news on the verification and validation process of your described code-changes?

Thank you very much in advance.

I am looking forward to hearing from you.

Best regards,

Michael

[Audun]

Hi Michael,

sorry for the lack of response. I've been working on the code this past week. It has taken quite a bit of time, as it can take several hours for the corner cases to appear.

I've finally pushed my test code to this branch: https://github.com/nordic-auko/nRF5-ble-timesync-demo/tree/counter_revamp

There are quite a few changes/simplifications, but I hope it's not too cumbersome for you to test it together with the changes you've already made.

Note that I set TIME_SYNC_TIMER_MAX_VAL  to 16000 in an attempt to speed up the edge condition generation rate. You can change this as needed.

Best regards,

Audun