time synchronization across different nodes in a mesh network, single hop as well as multi hop.

[khosla]

I am working on time synchronizations between different nodes in a mesh network. I have earlier worked on the radio and the ppi examples given. I wish to generate time stamps at each send and receive events between two different nodes for which i am using the nRF radio along with two crystal oscillators, 16 M XOSC as well as 32.768 KHz XOSC with quartz crystal. Could you let me know that if i am using the ppi with the radio functionality, how do i define the two nodes in my code between which i want to send packets. then can i extend this case for n nodes too.

[khosla]

button.txtHi if i use the same code for both the transmitter and receiver, as u saw in the earlier paper i sent u, there would be confusion regarding whether node 1 is transmitting to node 2 or node 2 is transmitting back to 1. Since there are 2 transmit and 2 receive events taking place in one full cycle as per the figure. How to fix this? Probably one way could be that in the main function, i define which button ticks corresponding to which node. But how to define it in the code.

The second thing that i need to load the timestamp in the packet just before it is sent, where exactly the timestamp value loaded should be shown in my case ?

mainc.txt

[Hung Bui]

I don't think using same code works here. One must be the initiator and the other one response when it receive the first packet.

I tried to explain you how the time stamp sampling and how we calculated the latency, add them up and put it to radio packet, several times in my comments earlier. Please try to test our example to understand how it works.