SD Interface on PICO-D4

[jasenharris]

The ESP32-PICO-D4 has an external 4MB QSPI Flash that is integrated into the single chip package. According to Note 2 on page 5 of ESP32-PICO-D4 Datasheet V1.7, PinsIO16,IO17,CMD,CLK,SD0andSD1 are used for connecting the embedded flash, and are not recommended for other uses. For details, please see Section 6 Schematics.

I want to confirm that this means that the SD interface consisting of pins SD0, SD1, SD2, SD3, CMD and CLK cannot or should not be used? If they can be used, is there contention with bus access to the internal 4MB program flash? Note that I would use the other set of SD interface pins except they conflict with the use of JTAG for debugging.

Thank you

[ESP_igrr]

Hi jasenharris,

I can confirm that HS1 pins of SDMMC peripheral can not be used on PICO-D4, because they would conflict with SPI Flash.