tinyusb_msc_storage: f_mkfs failed (14) (IEC-229)

[MatteoRodriguez]

Answers checklist.

• I have read the component documentation ESP-IDF Components and the issue is not addressed there.
• I am using target and esp-idf version as defined in component's idf_component.yml
• I have searched the issue tracker for a similar issue and not found any related issue.

Which component are you using? If you choose Other, provide details in More Information.

device/esp_tinyusb

ESP-IDF version.

v5.2.1

Development Kit.

esp32s3 custom board

Used Component version.

v1.4.4

More Information.

Hello,

I have a custom board with an ESP32-S3-WROOM-2 MON32R8V and an EMMC04G-MT32. I am trying to use tinyusb to make this board behave as a MSC device but I have a problem with the emmc. The tinyusb stack seems to fail to format and mount the emmc when there is no partition on it.

I am pretty sure it has nothing to do with the hardware. My whole code runs perfectly when I use the internal storage of the esp (it behaves as a MSC device). I tested the emmc example (using esp_vfs_fat_sdmmc_mount) and it can format and mount and use the emmc without any problem. I also tested the tusb_msc example and this one CANNOT format the emmc. And once the emmc has been formated, my code is working well.

As you can see on the log above, the code is able to talk with the emmc. But there is a conflict with the allocation unit size. I tried everything I could in menuconfig to set this parameter to 512 but I failed doing so. It feels to be hardcoded in the tinyusb library.

Or maybe I am missing some initializing steps with vfs_fat... Here are my initializing steps with tinyusb :

And this is the details of the storage_init_emmc function :

Thanks for your help.