Metro RP2350 CP 10.x /sd

[mikeysklar]

Demo code for CircuitPython 10.x SD card list and write. The 9.x examples are not compatible.

Addresses CircuitPython Issue # 10419

Addresses Forum Issue: SD Card on Metro RP2350 Setup

CircuitPython 10.x introduces automounting of /sd. The Metro RP2350 no detects and automounts a /sd card using SDIO. No initialization is required in the example code. Example code for 9.x and 10.x will need to be in place for some time to prevent mass hysteria.

Tested on both 10.x read / write scripts with:

+------------------------+-------------------------+
| Component              | Details                 |
+------------------------+-------------------------+
| Board                  | Metro RP2350            |
| microSD Card           | SanDisk Ultra A1 16 GB  |
| CircuitPython Version  | 9.2.8                    |
| CircuitPython Version  | 10.0.0-alpha6            |
+------------------------+-------------------------+

[FoamyGuy]

I think it would be good to use try/except so that we can support both 9.2.x and 10.x with the same code for now. I submitted #3062 just now with try/except before I saw that this PR was already submitted

[mikeysklar]

Yeah, I was thinking about doing a single file update with logic to support both as well. My only reluctance was the aesthetic. The new automount code is so clean and simple to drop into projects while the legacy pin setup and additional try / except lose that elegance.

Anyway...Your call. I didn't mean to stomp on your PR.

[FoamyGuy]

No worries, I appreciate you finding, reporting, and fixing it :)

[mikeysklar]

Your PR looks good. I will delete this branch.