Using the SDIO on the ESP8266 module...

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Re: Using the SDIO on the ESP8266 module...

By Gopal@425
- Thu Feb 21, 2019 12:41 am #80685 Hi, I have a small doubt regarding SDIO pins on the Node mcu wifi module. Is there any SDIO slave device inside the Wifi module? If yes, Can we access this SDIO slave via SDIO pins from an external SDIO host controller? Can some one please help by giving clarification regarding this.

Thanks in Advance!
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Re: Using the SDIO on the ESP8266 module...

By eriksl
- Fri Mar 08, 2019 6:20 am #80958 The SD interface is for slave only, not for master, so you won't be able to use a regular SD flash memory card.

Besides that, the pins are multiplexed on the SPI interface to the flash chip, so you would have to be very careful not to disturb that process. I think you would need to have all SD code in IRAM and make sure the SPI CS for flash memory is never triggered while communicating with the SD device. Doable but risky.
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