Hotplug Xmos links

[jzw]

I have a well proven board based on the XU216-512-FB236 part. This has links five and six brought out to a connector and I would like to communicate with another similar board over one of these links. I have code based on the AN01024 application note that establishes credit between two boards, which I can prove by disconnecting, running code on both, and reconnecting the link.

I am do not understand how to associate a channel with a physical link. This is something to do with routing but I am confused by the documentation. There are several other posts that have achieved the connection but none have full working example code. I am using the xn file for the XCORE-200-EXPLORER board.

Attached are the two simplified sources I am using. Any help would be welcome.

[CousinItt]

Can you post your XN file(s)?

Also you might want to take a look here:

https://www.xcore.com/viewtopic.php?f=7&t=6856

[jzw]

I am using the standard xn file for the explorer board. It's attached to avoid any possible confusion. I have looked at the thread suggested and this is trying to do something similar to my requirement. I want to have two (or more) independent boards with their own flash programme. I cannot see how to specify an additional external link for individual boards with a specified channel end number in the xn file or to set up the "Xconnect switch" directly.

[CousinItt]

Take a look at this article:

https://www.xcore.com/viewtopic.php?f=8&t=4837

I can't tell from your original post whether you need dynamic linking to be set up or whether this would be good enough.

[jzw]

I want to have a pair of independent boards with individual flashed code that I can connect together if required using link 5. Each board would have the same code programmed so dynamic hot-plugging would be required.

Thanks for responding quickly.

[CousinItt]

It's very easy to set up a static link using @johned's example, so it's a good idea to pair up a couple of boards that way just to prove the link is reliable, accepting that the code may be asymmetric.

Once you've done that you can experiment with the dynamic link.

[jzw]

After some empirical channel setup experiments I now have a method of communicating at reasonable speed reliably between two boards. The two sources are loaded with this post. However I am now plagued with resource errors when I add this code into bigger programmes. Presumably this is caused by accessing unsafe regions which are being corrupted by something else but I have so far not found a way of preventing this. Any help would be appreciated.