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bblanchon / ArduinoJson

📟 JSON library for Arduino and embedded C++. Simple and efficient.
https://arduinojson.org
MIT License
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Memory Allocation Fails on Teknic ClearCore #1386

Closed youcangetme closed 4 years ago

youcangetme commented 4 years ago

I can pretty much assure you memory allocation in ArduinoJson is failing on Atmel (Microchip) ATSAMD51N19A chips.

I am not sure what the problem is but it "looks like" the memory allocation always returns 0 bytes. I tried to debug it myself but I am truly late on my delivery. The binary config was a bridge too far for my client which is why I revisited it.

The Arduino.cc "beta" Arduino_Json library has no such issue on these chips with the exact same file, no changes. The biggest different is you pass Arduino_Json a char array to parse, it doesn't allocate the memory itself.

Best of luck!

https://www.microchip.com/wwwproducts/en/ATSAMD51N19A

bblanchon commented 4 years ago

Hi @youcangetme,

That's really surprising. Are the examples working?

Best regards, Benoit

bblanchon commented 4 years ago

@youcangetme, I'm sorry to stress you, but can you confirm that the examples don't work?

I really doubt this is possible, but if it's true, I need to get my hands on one of these devices immediately. I regularly test on SAMD21, but I don't own a SAMD51. Can you recommend an inexpensive board that embeds this microcontroller?

youcangetme commented 4 years ago

I did test the examples and the ones I tried failed. Adafruit sells one (Grand Central Express) but It might be a different chip within the D51s. In fact I have one laying around here somewhere. I will pull it out and see if I can get it to replicate the issue and get back to you. They run about $40USD whereas the ClearCore are hardened industrial 24 volt I/O Arduinos and run $150.

bblanchon commented 4 years ago

I went for an Adafruit ItsyBitsy M4 Express; it was the cheapest I could find.

bblanchon commented 4 years ago

Hi @youcangetme,

I received the Adafruit ItsyBitsy M4 Express. I can confirm that the following examples are working as expected:

It's a SAMD51, like the ClearCore, but I'm not using the same Arduino core. I tested with the Adafruit SAMD Arduino Core, whereas you're using the ClearCore Arduino Wrapper. This means the problem could be related to the core.

Can you double-check the example, and see if you can find out more about the issue?

BTW, it's the first time someone tells me that Arduino_JSON works better than ArduinoJson; usually, it's the other way around. After re-reading your message I realized that ArduinoJson is not shown on arduino.cc. I don't know how this is possible, since other JSON libraries and my other libraries are showing. I suspect that they banned ArduinoJson to promote their own library, so I tried to contact them on twitter.

Best regards, Benoit

bblanchon commented 4 years ago

Hi @youcangetme,

Did you get the opportunity to check the examples again?

Best regards, Benoit

youcangetme commented 4 years ago

I would love to help you. I am behind schedule getting this stupid project shrink wrapped and out the door though. Deaths by a thousand cuts? When I have this beast at v1 I will circle back around. I think ArduinoJson has better type conversion when assigning values. The other package certainly needs more "hints" to figure what you are asking if it. That I will grant you.