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Using mcu connected MMC storage appear as a mounted ''Mass Storage device''?

Abhishek Kumar
Associate III

‎2017-12-20 11:07 AM

Posted on December 20, 2017 at 20:07

My design has got a MMC storage chip (MTFC16GAKAECN-4M)(e.MMC v5.1 standard) connected to STM32F7 mcu. Provided I will be using FAT file system on this eMMC storage, is there a way to open this MMC storage as USB disk drive when I connect the STM32F7 as USB device to the PC?

#sdcard #mmc #stm-32f7
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Tesla DeLorean
Guru

‎2017-12-20 11:15 AM

Posted on December 20, 2017 at 20:15

I would imagine you have to map MSC command packets to access the eMMC, in a similar way you would to access an on-board MicroSD card or SDRAM based RAM Drive.

Concurrent access between F7 based app and PC to the file system can be problematic, the simplest route being to grant access either to the MSC or the app.

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Abhishek Kumar
Associate III
In response to Tesla DeLorean

‎2017-12-20 11:02 PM

Posted on December 21, 2017 at 07:02

Yes, I 

have to map MSC command packets to access the eMMC only. Are there any examples of doing that?

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