Esp32 read emmc

[pirrup]

Hi Renzo,

Hope you or someone can help me find what i am looking for.

I am looking for a solution to read the emmc chip from another pcb (ISP pinout available)

What development board should i go for to do this?

Requirements:

The emmc chip is soldered on target but i have working ISP pinout.
1 data line is ok.
Emmc vcc is 3.3v and vccq is 1.8v
Can power be given to target board? So I don’t need to power target itself and use the ISP pinout to give vcc and vccq?

Would this be possible with some ESP32-S3 development board? Or do i need other solution?

I hope someone can help or point me in the right direction 🙂

Kind regards,
Pirrup

[Renzo Mischianti]

Hi pirrup,
all the boards that have 3.3v logic are ok. In my opinion, STM32 has superior quality and can be used with more efficiency, but not needed.

To power emmc you can use a 3.3v pin of the microcontroller.

But I think there is a simplest solution like the USB adapter that can be used with software developed for windows and Linux.

Bye Renzo

[pirrup]

Thanks for the answer Renzo!

I know i can just desolder it and use socket to read and write emmc. That is how i do it now but wanted to see if i can use something like ESP32 or STM32 to do this.

After seeing your blog post about accessing emmc/sd.

Can you point me in the right direction where i could find a good development board and some base code?

[Renzo Mischianti]

If you have identified the pins you can follow these guide for the specified Microcontroller.

Raspberry Pi Pico and rp2040 boards: how to use SD card – 5

How to use SD card with stm32 and SdFat library

How to use SD card with esp32 – 2

How to use SD card with esp8266 and Arduino – 1

Bye Renzo

[Author]

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