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sdmmc_host

内部関数です。通常は使いません。

利用方法

#include <driver/sdmmc_host.h>

上記宣言で利用できます。

メンバー

sdmmc_host_init()

Initialize SDMMC host peripheral

esp_err_t sdmmc_host_init()

戻り値

esp_err_t

sdmmc_host_init_slot()

Initialize given slot of SDMMC peripheral

Card detect and write protect signals can be routed to arbitrary GPIOs using GPIO matrix. 

esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t *slot_config)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • sdmmc_slot_config_tconst * slot_config additional configuration for the slot

戻り値

esp_err_t

sdmmc_host_set_bus_width()

Select bus width to be used for data transfer

SD/MMC card must be initialized prior to this command, and a command to set bus width has to be sent to the card (e.g. SD_APP_SET_BUS_WIDTH) 

esp_err_t sdmmc_host_set_bus_width(int slot, size_t width)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • size_t width bus width (1, 4, or 8 for slot 0; 1 or 4 for slot 1)

戻り値

esp_err_t

sdmmc_host_get_slot_width()

Get bus width configured in to be used for data transfer

size_t sdmmc_host_get_slot_width(int slot)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)

戻り値

size_t configured bus width of the specified slot.

sdmmc_host_set_card_clk()

Set card clock frequency

Currently only integer fractions of 40MHz clock can be used. For High Speed cards, 40MHz can be used. For Default Speed cards, 20MHz can be used. 

esp_err_t sdmmc_host_set_card_clk(int slot, uint32_t freq_khz)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • uint32_t freq_khz card clock frequency, in kHz

戻り値

esp_err_t

sdmmc_host_set_bus_ddr_mode()

Enable or disable DDR mode of SD interface

esp_err_t sdmmc_host_set_bus_ddr_mode(int slot, bool ddr_enabled)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • bool ddr_enabled enable or disable DDR mode

戻り値

esp_err_t

sdmmc_host_do_transaction()

Send command to the card and get response

This function returns when command is sent and response is received, or data is transferred, or timeout occurs. 

esp_err_t sdmmc_host_do_transaction(int slot, sdmmc_command_t *cmdinfo)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • sdmmc_command_t* cmdinfo pointer to structure describing command and data to transfer

戻り値

esp_err_t

sdmmc_host_io_int_enable()

Enable IO interrupts

This function configures the host to accept SDIO interrupts. 

esp_err_t sdmmc_host_io_int_enable(int slot)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)

戻り値

esp_err_t

sdmmc_host_io_int_wait()

Block until an SDIO interrupt is received, or timeout occurs

esp_err_t sdmmc_host_io_int_wait(int slot, TickType_t timeout_ticks)

引数

  • int slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
  • TickType_t timeout_ticks number of RTOS ticks to wait for the interrupt

戻り値

esp_err_t

sdmmc_host_deinit()

Disable SDMMC host and release allocated resources

esp_err_t sdmmc_host_deinit()

戻り値

esp_err_t

sdmmc_host_pullup_en()

Enable the pull-ups of sd pins.

esp_err_t sdmmc_host_pullup_en(int slot, int width)

引数

  • int slot Slot to use, normally set it to 1.
  • int width Bit width of your configuration, 1 or 4.

戻り値

esp_err_t