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ESP32 has 3 SPI ports, one it uses for it's on flash chip, the VSPI can be used, but only the HSPI supports Quad SPI. Hookup the 8 wires to the SPI chip. In the SPI setup the message will negotiate the use 4 data lines.
[[File:Esp32.png|thumb]]
[[File:Qspi.png|thumb]]

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