![]() The protocol layer is given the sdmmc_host_t structure. ![]() ![]() Such locking is usually implemented on a higher layer, e.g., in the filesystem driver. For this reason, the protocol layer does not implement any kind of locking on the sdmmc_card_t structure, or when accessing SDMMC or SD SPI host drivers. Most applications need to use the protocol layer only in one task. The driver does not support SD combo cards. See README.md file in the example directory for more information. This example initializes the card, then writes and reads data from it using POSIX and C library APIs. Application Example Īn example which combines the SDMMC driver with the FATFS library is provided in the storage/sd_card directory of ESP-IDF examples. This structure contains pointers to various functions of the host. The protocol layer works with the host via the sdmmc_host_t structure. The SDMMC protocol layer described in this document handles the specifics of the SD protocol, such as the card initialization and data transfer commands. ![]() SDMMC and SD SPI host drivers ( driver/include/driver/sdmmc_host.h and driver/include/driver/sdspi_host.h) provide API functions for:įor functions used to initialize and configure: This is a protocol level driver built on top of SDMMC and SD SPI host drivers. The SD/SDIO/MMC driver currently supports SD memory, SDIO cards, and eMMC chips.
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June 2023
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