Memory usage example does not work (t3.6)

[crteensy]

When I compile the memory usage example for the teensy 3.6 and download it, USB Serial is not available and I can't see any results.

[duff2013]

Strange I just used on my 3.6, use the Serial Plotter also.

[crteensy]

I tried again:

• Examples->Zilch->memory_layout, compile and upload
• Tools->Port is grayed out
• Serial Monitor shows Teensy as "Offline" in title bar
• Serial Plotter shows an error message: "Board at /dev/ttyACM0 is not available"
• Teensy can only be reprogrammed by pushing the program button I'm using Arduino 1.8.4. Other sketches that use Serial work just fine.

[crteensy]

Is it possible that you made some changes locally that are not yet pushed to github?

[duff2013]

I'll check, what speed and optimization levels are you using?

[crteensy]

180 MHz, "Faster"

[duff2013]

Just updated the library and tried the memory layout example on the 3.6/Faster/180MHz and it works for me.

[crteensy]

Still doesn't work for me. I downloaded a fresh copy of the library, restarted arduino, replugged the Teensy - no luck. It might be my hardware then, or something totally different.

Same observations on a Teensy 3.2, 72 MHz, Faster!

[duff2013]

Maybe try to increase the stack sizes, and what version of Teensyduino are you using, I'm using 1.38 beta2.

[crteensy]

Teensyduino 1.39 release. I can't try it right now with increased stack sizes but I'll get back to it later today

[duff2013]

I can confirm Teensyduino 1.39 breaks Zilch! I have to see what changed since 1.38 beta2. Kind of annoying!

[crteensy]

funky: the simple Zilch example doesn't work either, but a sketch I wrote myself does. I even doubled the stack size in the simple example. Both the simple example and my sketch use AllocateMemoryPool(), task.create() and task.begin().

[crteensy]

it's really obscure. I now use freeMemory() in my application and it works as intended. It's just the examples that don't run.

[duff2013]

I think its all this event stuff paul added to the core which should be a library that gets added if I want it, now I have figure out some work around.

[crteensy]

Yes there was a discussion about yield() which might be relevant but I wasn't sure

[duff2013]

It was that yield problem, looks like paul going to have fix soon. But if you want to fix it now, FrankB's patch works.

[duff2013]

Pauls patch works and easier fix:)

[crteensy]

With the linked patch applied it works on T3.6 (memory layout example, simple example and own sketch).