eMMC prototyping on NUCLEO

[frd66]

Hi All,

I'm looking for advices about boards/components to use for eMMC prototyping.

I have got a NUCLEO-H743ZI board, but it seems that there is no shield board for eMMC, and that a solution would be to use SD/MMC card breakout + eMMC dongle.

Could one give me some references?

Or confirm that those:

• SparkFun SD/MMC Card Breakout
• eMMC Module Reader Board
• 16GB eMMC Module

are OK?

Thanks in advance!

[Tesla DeLorean]

Hours of fun to be had there.. My approach was to use the ODROID eMMC modules, will also plug directly into an assortment of EVAL and DISCO series boards. Have 4 thru 128 GB working.

People have made direct dongles, but soldering eMMC BGA's is a pain. For raw devices consider clam-shell sockets.

These would be better sockets, having appropriate pull-ups and size

https://www.waveshare.com/micro-sd-storage-board.htm

https://www.waveshare.com/sd-storage-board.htm

I have some direct ones that plug in the back-side of the Nucleo-144 also.

[Tesla DeLorean]

https://community.st.com/s/question/0D50X00009sVV1FSAW/stm32l4-sdmmc-standalone-mode-no-rtos-works-polled-not-with-dma

[frd66]

Thanks for the answer, Clive.

Seems more difficult to purchase from here (France), but I will try anyway...

What do you mean by 'I have some direct ones that plug in the back-side of the Nucleo-144 also.' ?

Another reference?

[Tesla DeLorean]

@Community member​ fabbed some SD card sockets (hats) that plug into the the Nucleo-144 header

[Tesla DeLorean]

The ODROID was my most portable/flexible method

@Community member​ made an eMMC dongle, worked as either an SD card or top/bottom of Nucleo-144 depending on socket/headering attached.

I used a 16-pin socket so I can rear mount it and not foul the shield socket.

I'd probably buy a clam-shell socket and wire that if doing more work on them, or a customer specific IC needed testing.

[frd66]

OK, I'm convinced by the ODROID solution.

The Lukaszs' custom board is nice, but it would take too much time to do so!

BTW, thank you for your warning about the lack of traction of the Sparkfun solution 🙂

[Tesla DeLorean]

It is a fullsized socket, and lacks any pull-up resistors. I've used them on Nucleo boards (the $2.99 eBay version), but they would need another adapter to work with the ODROID adapter, and not something I'd recommend for 50-60 MHz clocking, or DDR experiments.

Generally you'd also want 33 or 27 ohm series resistors on a board level eMMC design to reduce the ringing in short traces.