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