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I understand that the extra 2MB of memory is for circuit python. However, I wouldn't mind having access to 2MB of storage and using the Arduino IDE/low level C to access it. Is that possible? If so, how?

Michael Stachowsky
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    please provide all available information in your post ... there is no reason why people would have to do internet searches for a datasheet and for any applicable libraries before being able to answer your question – jsotola Aug 07 '20 at 19:13
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    You may be interested in Adafruit's FRAM breakout board: https://www.adafruit.com/product/1895 They have an SPI version too, and both support 256Kbit's of persistent storage. Plus, they're super easy to use. – SnakeDoc Aug 07 '20 at 20:22
  • https://github.com/adafruit/Adafruit_SPIFlash – Juraj Aug 07 '20 at 20:31
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    What is Adafruit's Circuit Playground Express's 2MB storage? – Majenko Aug 07 '20 at 20:44
  • @Majenko, a board by Adafruit a well known and established company with a good web site. Circuit Playground Express is the only one not Arduino board in Arduino SAMD boards package. you could ask what is Neopixels or Feather Huzzah or MKR – Juraj Aug 08 '20 at 04:55
  • @Juraj Yes.... I know who Adafruit are. But what is the "2MB storage"? Is it a physical device? If so what is it? Or is it some online service provided by Adafruit? It's not clear, and I shouldn't need to google these things. – Majenko Aug 08 '20 at 16:21
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    So... it's just a run-of-the-mill 16Mb SPI flash chip. Big whoop. Wanna fight about it? Also Cypress list that model as obsolete now... – Majenko Aug 08 '20 at 16:25
  • @Majenko, as I saw the question I opened the Adafruit site for the board and there it is: "2 MB of SPI Flash storage, used primarily with CircuitPython to store code and libraries.". – Juraj Aug 08 '20 at 17:59

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In their guided tour of the Adafruit Circuit Playground Express, it specifically states:

You can use this in Arduino or CircuitPython to store files.

So yes, it is possible. As far as the how, according to this guide (also from Adafruit), that they have also made a library, Adafruit SPI Flash, which has a bunch of examples showing how to read from, write to, and format the SPI flash whilst retaining compatibility with CircuitPython, among other things.

Peter Feerick
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