esp-idf/components/esp_driver_sdspi/README.md

SDSPI Host Driver

SD Host side related components are:

• sdmmc
• esp_driver_sdmmc
• esp_driver_sdspi (current component)

For relationship and dependency among these components, see SD Host Side Related Component Architecture.

esp_driver_sdspi components is a driver based on ESP GPSPI master driver to help you:

• do SD transactions (under SDSPI mode) via ESP GPSPI peripheral.
• tune ESP GPSPI hardware configurations, such as clock frequency, bus width, etc.
• ...

You can

• use this driver to implement sdmmc protocol interfaces
• directly use esp_driver_sdspi APIs

to communicate with SD slave devices under SDSPI mode.