peter/eMMC-USB-mass-storage-device-STM32L476
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Example of how to use the SDIO/SDMMC peripheral in 4-bit wide mode with USB mass storage class with DMA transfers.
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README.md

DMA eMMC USB mass storage class device demo STM32L476RET6

IMPORTANT: Clock is configured for a 16 MHz crystal.

Example of how to use the SDIO/SDMMC peripheral in 4-bit wide mode with USB mass storage class with DMA transfers.

Read my post about setting this up on my website: https://www.petertanner.dev/posts/Debugging-STM32-USB-Mass-Storage-Class-Device/

Example benchmark

Wow this performance is terrible... but at least I got it working or something

Crystaldiskmark benchmark