esp-idf/components/sdmmc/README.md

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# SDMMC Protocol Layer Driver
## SD Host Side Related Component Architecture
### Architecture Graph
┌─────────────────────────────────────────────┐
│ │
│ SD Protocol Layer Driver: components/sdmmc │
│ │
└──────────▲────────────────────▲─────────────┘
│ │
│ │
Implements │ │ Implements
│ │
┌──────────────────────────────────┴─────┐ ┌────┴───────────────────────────────────┐
│ │ │ │
│Host Driver: components/esp_driver_sdmmc│ │Host Driver: components/esp_driver_sdspi│
│ │ │ │
└────────────────────────────────────────┘ └────────────────────────────────────────┘
### Components
- `sdmmc`: SD protocol layer driver, it provides SD protocol related definitions and interfaces. With corresponding implementation drivers, `sdmmc` APIs can help you:
- send commands to slave devices
- send and receive data
- handle error conditions within the bus
- `esp_driver_sdmmc`: SDMMC Host driver for ESP SDMMC hardware, it implements the `sdmmc` protocol interfaces.
- `esp_driver_sdspi`: SDSPI Host driver for ESP GPSPI hardware, it implements the `sdmmc` protocol interfaces.
### Dependency
- `esp_driver_sdmmc` is in driver layer (G2), it relies on `sdmmc`
- `esp_driver_sdspi` is in driver layer (G2), it relies on `sdmmc`
- `sdmmc` does not and should not rely on `esp_driver_sdmmc` or `esp_driver_sdspi`. Though `sdmmc` is independent, it still stays in G2.