QSPI Flash in Arduino Opta

[putertubby]

Greetings,

Thanks to a lot of help from this community in the past I managed to hack together a custom target for Arduino Opta that has worked perfectly for over a year now. The application is using GPIO, Modbus RTU and Ethernet so far without a hitch!

Now I'm trying to enable persistent storage on the device but have issues with getting QSPIFBlockDevice to parse the SFDP basic param table. Is this something that I should be able to fix with configuration or is there still development that needs to be done?

I notice that the Portenta pins for QSPI are different than the Opta pins and since my custom target is based off the Portenta I'm guessing that some adjustments are required. I tried just using the correct pins in the constructor but that doesn't seem to be enough.

#define QSPI_SO0        PD_11
#define QSPI_SO1        PD_12
#define QSPI_SO2        PE_2
#define QSPI_SO3        PD_13
#define QSPI_SCK        PB_2
#define QSPI_CS         PG_6

QSPIFBlockDevice root(QSPI_SO0, QSPI_SO1, QSPI_SO2, QSPI_SO3, QSPI_SCK, QSPI_CS, QSPIF_POLARITY_MODE_1, 40000000);
auto result = root.init(); // returns QSPIF_BD_ERROR_PARSING_FAILED (_sfdp_parse_basic_param_table fails)

Any and all advice is greatly appreciated!

// Magnus

[multiplemonomials]

That's awesome! We'd love a contribution of this target!

Doing a little research, I can find absolutely no information about what QSPI flash is in the Opta, up to and including looking for teardown videos on youtube. Shame on them! So I am not sure if this will work, but I had to add a workaround for Arduino Giga:

mbed-os/storage/blockdevice/COMPONENT_QSPIF/mbed_lib.json5

Line 58 in f8619e3

"ARDUINO_GIGA": {

Maybe adding that for Arduino Opta will work as well. You would put the following in mbed_app.json:

"target_overrides": {
    "ARDUINO_OPTA": {
         "qspif.enable-and-reset": true,
         "qspif.QSPI_POLARITY_MODE": "QSPIF_POLARITY_MODE_1"
    }
}

If that doesn't work, I don't know what else we can try unless you take apart one of yours to see what QSPI flash is inside of it

[multiplemonomials]

Actually, digging through the Arduino patches on top of Mbed, I found this one:

https://github.com/arduino/ArduinoCore-mbed/blob/main/patches/0189-QSPI-call-is_mem_ready-before-trying-to-set-write-en.patch

Which seems to imply (from the commit history) that the Giga and Opta have the same flash.

Interestingly, I never applied these patches to Mbed CE, but the flash seems to work OK. Perhaps we should merge them, along with these:

https://github.com/arduino/ArduinoCore-mbed/blob/264de241ba760c186a46a983192f1471976e1764/patches/0190-QSPI-add-Adesto-quirks-and-adapt-QSPIFBlockDevice-fu.patch#L22
https://github.com/arduino/ArduinoCore-mbed/blob/264de241ba760c186a46a983192f1471976e1764/patches/0195-QSPI-apply-Adesto-quirk-only-for-AT25SF128A.patch#L21

Would love a PR if you could try integrating these patches and test them!

[putertubby]

Thanks, the "enable-and-reset" override did the trick! The flash seems to work well without the patches but I'll integrate them and test to see if I notice any difference. I'll also create a PR with the Opta target but will likely need some guidance wrt what goes where.

[multiplemonomials]

Yay thanks a ton!! Happy to review