5 replies to this topic

[Kip]

Hi to all! This is my first post on this forum

 

I have a few issues with my NP2 (fw 4.3 beta 1), first of all... often I get the "Unable to communicate with USB:Netduino" error, which I can only solve by reflashing the firmware... any clues?

 

(by the way, is source for v4.3 beta available? I'm having troubles recompiling 4.2.2.2)

 

The second problem is with storage: I have to store 32 bytes of data on chip, and I read you can't use ExtendedWeakReference... is it true?

 

Third: is there a way to use unsafe code? I read on the forum that you actually can, but everytime I try to use it, netduino just hangs and I have to reflash the firmware :

 

Fourth: every STM32F40 has a 96 bit unique ID, is it exposed somewhere?

 

The last 3 problems can be solved by compiling my own custom firmware, but I don't really want to install VS 2010, so I should just wait for v4.3 to come out and work on that firmware :

 

Sorry for the long post

Edited by Kip, 03 December 2013 - 06:23 PM.

[Kip]

I managed to compile the firmware, but it's too old...

[Chris Walker]

Hi Kip, No ExtendedWeakReferences. There are some limitations to it which impact garbage collection--and Netduino Plus boards have MicroSD support--so we left out this legacy feature in return for a better user experience. BTW, you can use VS2012 and the Netduino 4.3 SDK with older boards. Just change the "target framework" in project properties to NETMF 4.1/4.2. One warning though: the NETMF 4.3 SDK has some timing bugs which can make debugging slow on older boards. Other than that, though, it works pretty well. Chris

[Kip]

I'll probably have to scale down to a Netduino 2, so microSD isn't an option right now... Maybe I'll try to bake something in with interop, I only have to write just a few bytes and I rather store them on chip.

 

What do you mean for "older boards"? "boards with 4.1/4.2 on it" or "boards that were born on 4.1/4.2 even if they've been upgraded to 4.3"?

 

Thanks for your help

[Chris Walker]

Hi Kip, The debug channel timing changed between 4.2 and 4.3, to improve the Visual Studio experience. But single-stepping code on 4.2 boards--using the 4.3 SDK--can be sluggish. It's not a dealbreaker, but it is a known issue. Chris

[Kip]

Ok, I just wasn't sure what was defined as "older boards"

 

Thanks