Spi Flash Api - Espressif ESP32-S2 Programming Manual

Chapter 2. API Reference
uint32_t is_mem : 1
Bit indicates if the card is a memory card
uint32_t is_sdio : 1
Bit indicates if the card is an IO card
uint32_t is_mmc : 1
Bit indicates if the card is MMC
uint32_t num_io_functions : 3
If is_sdio is 1, contains the number of IO functions on the card
uint32_t log_bus_width : 2
log2(bus width supported by card)
uint32_t is_ddr : 1
Card supports DDR mode
uint32_t reserved : 23
Reserved for future expansion
Macros
SDMMC_HOST_FLAG_1BIT
host supports 1-line SD and MMC protocol
SDMMC_HOST_FLAG_4BIT
host supports 4-line SD and MMC protocol
SDMMC_HOST_FLAG_8BIT
host supports 8-line MMC protocol
SDMMC_HOST_FLAG_SPI
host supports SPI protocol
SDMMC_HOST_FLAG_DDR
host supports DDR mode for SD/MMC
SDMMC_HOST_FLAG_DEINIT_ARG
host deinit function called with the slot argument
SDMMC_FREQ_DEFAULT
SD/MMC Default speed (limited by clock divider)
SDMMC_FREQ_HIGHSPEED
SD High speed (limited by clock divider)
SDMMC_FREQ_PROBING
SD/MMC probing speed
SDMMC_FREQ_52M
MMC 52MHz speed
SDMMC_FREQ_26M
MMC 26MHz speed
Type Definitions
typedef uint32_t sdmmc_response_t[4]
SD/MMC command response buffer

2.5.6 SPI Flash API

Espressif Systems 739
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