External Memory Chip

phando
Posts: 24
Joined: Wed Dec 14, 2016 5:30 am

External Memory Chip

Postby phando » Tue Mar 20, 2018 4:04 am

Hello,
I am making a small board with the ESP32 WROOM at its heart. I have connected most of my pins, but have noticed that there are a hand-full of pins going unused. CLK, CMD, SD0, SD1, SD2, and SD3. I have yet to see a wiring diagram using those pins to interface with an SD card.

Thanks

WiFive
Posts: 3529
Joined: Tue Dec 01, 2015 7:35 am

Re: External Memory Chip

Postby WiFive » Tue Mar 20, 2018 5:16 am

Those pins are not unused, they are connected to the flash chip. And those designations SD_ are for using esp32 as an sdio slave. HS1_ and HS2_ pins are for sdio master. But HS1 conflicts with flash chip pins and so far is not usable.

phando
Posts: 24
Joined: Wed Dec 14, 2016 5:30 am

Re: External Memory Chip

Postby phando » Tue Mar 20, 2018 3:52 pm

Thank you!

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