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esp-idf/components/sdmmc
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Andrey Starodubtsev b8e3552145 fix(sdmmc): Minor changes in sdmmc 
- don't do swapping if result is thrown away
- use correct return code if csd_ver is unknown
- use correct release function

    When `heap_caps_malloc`/`heap_caps_calloc` are used for allocation,
    `heap_caps_free` should be used to release allocated block.
2026-08-03 09:19:06 +02:00
..
include
fix(sdmmc): Multi-block read/writes support refactor + tests and documentation added
2026-04-13 16:17:39 +02:00
sd_pwr_ctrl
change(sdmmc): update ldo acquire driver to new API
2024-03-25 21:19:12 +08:00
test_apps
fix(sdmmc): Multi-block read/writes support refactor + tests and documentation added
2026-04-13 16:17:39 +02:00
CMakeLists.txt
change(sdmmc): update ldo acquire driver to new API
2024-03-25 21:19:12 +08:00
README.md
feat(sd): added readme for dependency among SD host related components
2023-11-20 12:30:03 +08:00
sdmmc_cmd.c
fix(sdmmc): Minor changes in sdmmc
2026-08-03 09:19:06 +02:00
sdmmc_common.c
fix(sdspi): 0x106 error during SD card init via SPI related fixes
2026-03-18 14:05:06 +01:00
sdmmc_init.c
fix(sdspi): 0x106 error during SD card init via SPI related fixes
2026-03-18 14:05:06 +01:00
sdmmc_io.c
fix(sdmmc): fix sdmmc initialization issue in caused by CMD52 CRC error
2025-07-01 13:40:45 +02:00
sdmmc_mmc.c
fix(sdmmc): Minor changes in sdmmc
2026-08-03 09:19:06 +02:00
sdmmc_sd.c
fix(sdmmc): Minor changes in sdmmc
2026-08-03 09:19:06 +02:00

README.md

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.