USB Flash Drive support using native USB Host + MSC

[rhapsodyv]

Requirements

Nano V3, GTR or SKR PRO boards

Description

This PR add support for native USB Flash Drive, using OTG and USB Host.

Stm32duino didn't merge my USB Host PR yet, so I created new envs pointing to my stm32duino PR.

Benefits

Native USB Flash Drive for Marlin.

Configurations

#define USB_FLASH_DRIVE_SUPPORT
#define USE_OTG_USB_HOST

Related Issues

#20299

[sjasonsmith]

I haven't actually looked at all of this yet. These are just a couple thoughts as I skimmed the changes.

[rhapsodyv]

I tested all last changes, made a few fixes and everything is working as expected.

[jeno007]

@rhapsodyv
Do I understand correctly that enabling USB_FLASH_DRIVE_SUPPORT is mutually exclusive with using the onboard SD card on SKR PRO? (and on every board as it seems to be a marlin limitation)
I just enabled the USB device msc mode with the onboard SD card, but it is slow due to the onboard SD card using software SPI I assume.
So I'm considering using the host msc with a thumb drive as you referenced it in stm32duino/Arduino_Core_STM32/pull/1196.
But I might lose the remote firmware update option if I lose the connection to the onboard SD.

[rhapsodyv]

@rhapsodyv
Do I understand correctly that enabling USB_FLASH_DRIVE_SUPPORT is mutually exclusive with using the onboard SD card on SKR PRO? (and on every board as it seems to be a marlin limitation)

Yes, but it's only temporary. I'm working to support multiples disk at same time on Marlin.

I just enabled the USB device msc mode with the onboard SD card, but it is slow due to the onboard SD card using software SPI I assume.

USB device or usb host?? This PR add support for USB HOST MSC (to use a flash drive), not usb device msc (to share the SD with the computer - it's a ongoing task too)

So I'm considering using the host msc with a thumb drive as you referenced it in stm32duino/Arduino_Core_STM32/pull/1196.

This is my PR and we are using it in Marlin now.

But I might lose the remote firmware update option if I lose the connection to the onboard SD.

Yes, but not because the Marlin, but because on SKR PRO you have to set the jumper to choose between USB host and usb device mode.
Nano V3, for example, you support both, even sharing the usb flash drive with the computer.

[jeno007]

Thank you.
I enabled USB device, to share the SD card with the octopi computer.
I know that this PR is about USB host msc.
The device msc works now, but slow due to the SD card working with software SPI I assume.
Now I understand that on SKR PRO there is now way to use a thumb drive (conencted to host msc) and share it via USB device.
I go back and try to implement hardware SPI.

[rhapsodyv]

Why are you using software spi?

[jeno007]

With standard Marlin, that is the only way. It can handle only one HW SPI bus and on SKR Pro V1.1 the HW SPI bus is connected to LCD's SD card. Also the onboard SD card works in SPI mode 3 due to a HW design mistake, what standard Marlin can not handle.
Thus the onboard SD card is handled by SW SPI in mode3.
@LinoBarreca created a quite complex patch to move all the SPI operations to HAL, thus extend it to handle multibus-multimode operations. With multibus, he also created a multi SD card handling (in a way, that Marlin can look for an SD card in multiple SPI buses).
I now just got his patch working on Marlin 2.0.7.2.
When I'm done with the test print, I will try to combine it with USB device msc, to make the HW SPI connected onboard SD card available to octopi.

[rhapsodyv]

I'm working on that. The main difference, is that we are creating the concept of "SPI Device", that holds all its config. Automatically it will allow multi bus/mode/etc. Soon we will push the changes.

About MSC on USB device mode, I'm working on that too.

[jeno007]

Sounds very good, I'm waiting for the "official" solution. :-)
Currently I'm just hacked together the unmerged PR-s I found.
Now with HW SPI the SD card write speed doubled to 80KB/s. I expected a bit more, but googling it around, it seems reasonable.