SD-Card SDIO/SPI helper lib #1663
Description
SD-Card is a must these days for all projects that requires more storage than the space in the flash.
Even though there are a few implementations out there e.g. pico-extrac (incomplete) and ZuluSCSI (GPLv3), it will be great if the SDK itself provides at least basic sdcard operations like init/deinit, read & write over both SDIO and SPI.