Can' compile example on Seeeduino XIAO & QT Py

[FedericoBusero]

I tried all kinds of combinations of versions to let the example compile on Seeeduino XIAO and QT PY, but I didn't succeed. Of course I have set it on "USB Stack: TinyUSB"

Can you give the version numbers for which the library has been designed for on a) Seeeduino XIAO and b) QT Py. Can you give for each of them:

• Arduino Board core version number
• sdFAT library version (Adafruit fork?)
• FlashStorage library version
• Adafruit SPIFlash library version
• Tinylibrary library version

Thanks!

[Mollayo]

What compilation error do you get ?

[Mollayo]

I have just compiled myself and I am facing the following compilation error:

SAMD_Internal_Flash_with_USB_Mass_Storage:19:39: error: cannot declare variable 'flashTransport' to be of abstract type 'Adafruit_FlashTransport_InternalFlash' 19 | Adafruit_FlashTransport_InternalFlash flashTransport(&my_internal_storage); | ^~~~~~ In file included from /home/fred/Arduino/libraries/SAMD_InternalFlash/src/SAMD_InternalFlash.h:28, from /home/fred/Arduino/SAMD_Internal_Flash_with_USB_Mass_Storage/SAMD_Internal_Flash_with_USB_Mass_Storage.ino:8: /home/fred/Arduino/libraries/SAMD_InternalFlash/src/Adafruit_FlashTransport_InternalFlash.h:36:7: note: because the following virtual functions are pure within 'Adafruit_FlashTransport_InternalFlash': 36 | class Adafruit_FlashTransport_InternalFlash : public Adafruit_FlashTransport { | ^~~~~~~~~ In file included from /home/fred/Arduino/libraries/SAMD_InternalFlash/src/Adafruit_FlashTransport_InternalFlash.h:31, from /home/fred/Arduino/libraries/SAMD_InternalFlash/src/SAMD_InternalFlash.h:28, from /home/fred/Arduino/SAMD_Internal_Flash_with_USB_Mass_Storage/SAMD_Internal_Flash_with_USB_Mass_Storage.ino:8: /home/fred/Arduino/libraries/Adafruit_SPIFlash/src/Adafruit_FlashTransport.h:71:16: note: 'virtual void Adafruit_FlashTransport::end()' 71 | virtual void end(void) = 0; | ^~~ Multiple libraries were found for "Adafruit_TinyUSB.h" Used: /home/fred/Arduino/libraries/Adafruit_TinyUSB_Library Not used: /home/fred/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/Adafruit_TinyUSB_Arduino Not used: /home/fred/Arduino/libraries/Adafruit_TinyUSB_Arduino Multiple libraries were found for "Adafruit_ZeroDMA.h" Used: /home/fred/.arduino15/packages/adafruit/hardware/samd/1.7.11/libraries/Adafruit_ZeroDMA Not used: /home/fred/Arduino/libraries/Adafruit_Zero_DMA_Library exit status 1 cannot declare variable 'flashTransport' to be of abstract type 'Adafruit_FlashTransport_InternalFlash'

Adafruit has made some changes to its library for InternalFlash. I will correct the error and update mine.

[Mollayo]

I have updated the library. It should compile again with the Adafruit board. Once the firmware has been uploaded, the SAMD disk should be formated using Windows or Ubuntu before use.

However, it does not compile using the Seeeduino board. There are some compilation errors between the Adafruit_TinyUSB and Seeeduino package. But you can use the Adafruit board for most of the Seeeduino devices with a SAMD microcontroller. For instance, the firmware for the Seeeduino XIAO can be generated using the Adafruit QT Py M0. These two boards use the same microcontroller.

[Mollayo]

Let me know if you have any other problem.

[FedericoBusero]

Thank you very much for your quick fix. I can indeed confirm that it now works on QT PY using SPIFlash library version 4.0.0.

• Remark that I also succeeded in running it on a Seeeduino XIAO. The trick is to use TinyUSB library version 0.10.5. I suggest to add this to README
• Also remark that there is a dependency on the SdFat library. I used the Adafruit fork. I suggest to add this to README

Thanks again, this really helps!

[Mollayo]

Ok. I will modify the README file according to your comments. Concerning the SdFat library, I have found that the access of the MCU to the internal flash such as here: https://github.com/Mollayo/SAMD_InternalFlash/blob/19863b0b301108d54027920b03c7fcb163f9721b/examples/Internal_Flash_with_USB_Mass_Storage/Internal_Flash_with_USB_Mass_Storage.ino#L121 does not work with SdFat version 2.2.1 but works with version 1.5.1. I do not know if you are experiencing the same isuue.

[FedericoBusero]

I currently can´t test, but I see other examples use FatFile or File as type of root.

[FedericoBusero]

Your code does compile, and USB Mass storage functionality works on

• Qt Py (TinyUSB 1.16.0 & SdFat 2.2.1),
• Seeeduino Xiao SAMD21 (TinyUSB 0.10.5 & SdFat 2.2.1) but indeed the serial port control functionality makes the system hang when opening files. I didn't check with version 1.5.1

But have a look at my example file https://github.com/FedericoBusero/USB_MassStorage_Flash/blob/main/USB_MassStorage_Flash.ino which does work on the same chips&versions including the serial port control functions.

It also works on ESP32-S2 using

• TinyUSB 0.16.0 in ESP32 Arduino Core 2.0.5 or
• TinyUSB 0.17.0 in ESP32 Arduino core 2.0.6.

[Mollayo]

I cannot test your code now. But when I tried few weeks back the SAMD_InternalFlash library with TinyUSB library version 0.10.5 and SdFat 1.51, it worked with no problem; the MCU could open and read the files. This is not the case with the lastest version of the TinyUSB library and the SdFat library. I will investigate this problem next week.

[FedericoBusero]

You are right: in SdFat - Adafruit fork version 1.5.1 it indeed does work. I tried all kinds of little changes (compared with my working code), but I couldn't get your code to work in SdFat - Adafruit fork version 2.2.1:

• FatFile instead of File/SdFile
• FatVolume instead of FatFileSystem
• Change setup order (Serial last)
• root & file global instead of local (influences stack requirements & constructor/destructor calls)

But in all cases, it hangs in the "listing files" code. I have no idea

[Mollayo]

I managed to make it working with the latest version of the Adafruit_SPIFlash library: https://github.com/adafruit/Adafruit_SPIFlash/releases/tag/4.1.0

You need to get this library from Github because the version which is available in the Arduibo IDE is 4.0.0. Also, you need to restart the Arduino IDE to take into account this new version.

Other libraries that are required:

• SDFat - Adafruit Fork 2.2.1 from the Arduino IDE
• Adafruit TinyUSB 1.17.0 from the Arduino IDE

[Mollayo]

@FedericoBusero Did you try to update the Adafruit_SPIFlash library as I explained above ? Could you make the SAMD_InternalFlash code working ?

[FedericoBusero]

I tried on QT Py using SPiFlash github version, TinyUSB 1.17.0:

• It no longer crashes when I execute command "l" for listing the files
• command "c" seems to work, but command "w" doesn't work. On the serial port I see "done", but when executing command "l" afterwards, the directory doesn't contain the file or the file system is corrupt.
• when testing the software by changing files on the USB stick seen from the computer, it seems to work on a first view, but when executing command "l", it is not updated (you don't see a new created file). This can be solved by adding "fatfs.cacheClear();" at the end of msc_flush_cb

I tried on Seeduino XIAO SAMD21 using SPiFlash github version, TinyUSB 0.10.5 with identical results:

[Mollayo]

Thank you for your feedback. I was actually using the ItsyBitsy M4 for testing and it worked with no problem.

I could reproduce your error with the Seeeduino XIAO. Actually, the writting of files does not seems to work. I have to investigate this problem. It might be related to some bugs in the Adafruit_SPIFlash library.

[Mollayo]

Actually, it looks like it's a problem related to the cache which is not correctly flushed.