Getting started with NUCLEO-F722ZE and a 16GB EMMC - MMC_PowerON fails

[bit-flipper]

Hello everyone!

I have started a small journey to try to get started with eMMC memory and are trying to get it working.The end goal is to have a USB HS mass storage device eMMC working with a file system. (32gb or more)

My current step that I'm stuck is where the "MX_SDMMC1_MMC_Init" fails.

Specifically to get the eMMC voltage level fails.

/* SEND CMD1 APP_CMD with voltage range as argument */

I have some theories what can be wrong but any help would be really useful 🙂

• Use external crystal as clock source on the NUCLEO instead of HSI [will try out this]
• SD breakout card setup [not sure what that would be?]
• Wrong clock configuration, currently targeting between 100-400kHz with the MMC divider [?]
• EMMC memory not supporting the CMD1 in the initialization [no idea if it could be like that?]
• Bad cable connection on my test board [will make another inspection or perhaps make a solder]
• More???

Code steps at failure

Hardware Setup

• NUCLEO-F722ZE
• Okdo eMMC 5.1 module for ROCK 16GB
• Okdo eMMC to MicroSD Adapter Board for ROCK Single Board Computers
• https://github.com/sbcshop/MicroSD-Breakout

SD Breakout Connection

CubeMX Configuration

Software setup

[Billy OWEN]

Hi @bit-flipper 

The forum moderator had marked your post as needing a little more investigation and direct support. An online support case has been created on your behalf, please stand by for just a moment and you will hear from us.

Regards,

Billy

[Johi]

I had similar problems with my STM32F407, the solution was to start with 1 bit and not 4 wide as my mmc did not support the 4 bits wide mode.