Panda II: CAN Channel 2?

NETMF & Gadgeteer
1

Has anyone actually used / tested the second CAN channel on their Panda?

Its either my unit is defective or something is wrong with the implementation of channel 2.

In my situation I cannot even get channel 2 to throw bus errors, much less work with data.

If you take the sample code from GHI Electronics – Where Hardware Meets Software
and change the code from channel 1 to channel 2 with no transceiver hooked up, just a raw Panda II board, you should throw a bus error… Otherwise tap the RD pin (di30) and you should throw bus errors in your debug window.

For me I get nothing… The Panda seems to think everything is fine, but nothing is happened. However, everything works great on channel 1. I can get bus errors, receive and transmit data using a transceiver with no issues.

I have burned up tons of hours trying to implement a second CAN channel with no luck… Therefore, I stripped down back to the bare Panda and I really think something is wrong with channel 2 @ a fundamental level… It might be just my unit is bad, but I hope that is not the case.

PLEASE HELP!

2

It is possible as most tests and most users are on channel1. We will investigate in few days.

3

Thanks Gus…

Being able to use both channels is requirement for my design. I am really hoping we can get to the bottom of this.

4

Well I got a couple more Pandas in the mail today… I will test to see if I can duplicate the issue when I get a chance.

Gus,

Have you had a chance to look into the implementation of the second channel? Its kind of a time sensitive requirement for my project. Any help you could offer would be much appreciated.

Thank you.

5

[quote]If you take the sample code from http://wiki.tinyclr.com/index.php?title=CAN
and change the code from channel 1 to channel 2 with no transceiver hooked up, just a raw Panda II board, you should throw a bus error… Otherwise tap the RD pin (di30) and you should throw bus errors in your debug window.

For me I get nothing… The Panda seems to think everything is fine, but nothing is happened. However, everything works great on channel 1. I can get bus errors, receive and transmit data using a transceiver with no issues.
[/quote]

I just did the same test, and I receive bus errors using channel 2. Did the new Pandas that you received work?

6

Ok, good news.

I tried channel 2 on my new Pandas and I am getting bus errors which is great! In fact, as soon as you launch the sample code with channel 2, it throws a bus error. The errors continue to get thrown if you touch the pins.

I ran the same exact code and test back to back with my original unit and channel 2 is just plain dead.

I am planning for a small production run using these Panda’s so I really hope I don’t run into this again.

Thanks guys.