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264 lines
9.6 KiB
C
264 lines
9.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include "soc/soc_caps.h"
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#if SOC_SDMMC_HOST_SUPPORTED
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#include <stdint.h>
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#include <stddef.h>
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#include "esp_err.h"
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#include "driver/sdmmc_types.h"
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#include "driver/sdmmc_default_configs.h"
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#include "driver/gpio.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Extra configuration for SDMMC peripheral slot
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*/
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typedef struct {
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gpio_num_t clk; ///< GPIO number of CLK signal.
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gpio_num_t cmd; ///< GPIO number of CMD signal.
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gpio_num_t d0; ///< GPIO number of D0 signal.
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gpio_num_t d1; ///< GPIO number of D1 signal.
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gpio_num_t d2; ///< GPIO number of D2 signal.
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gpio_num_t d3; ///< GPIO number of D3 signal.
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gpio_num_t d4; ///< GPIO number of D4 signal. Ignored in 1- or 4- line mode.
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gpio_num_t d5; ///< GPIO number of D5 signal. Ignored in 1- or 4- line mode.
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gpio_num_t d6; ///< GPIO number of D6 signal. Ignored in 1- or 4- line mode.
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gpio_num_t d7; ///< GPIO number of D7 signal. Ignored in 1- or 4- line mode.
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union {
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gpio_num_t gpio_cd; ///< GPIO number of card detect signal
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gpio_num_t cd; ///< GPIO number of card detect signal; shorter name.
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};
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union {
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gpio_num_t gpio_wp; ///< GPIO number of write protect signal
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gpio_num_t wp; ///< GPIO number of write protect signal; shorter name.
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};
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uint8_t width; ///< Bus width used by the slot (might be less than the max width supported)
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uint32_t flags; ///< Features used by this slot
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#define SDMMC_SLOT_FLAG_INTERNAL_PULLUP BIT(0)
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/**< Enable internal pullups on enabled pins. The internal pullups
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are insufficient however, please make sure external pullups are
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connected on the bus. This is for debug / example purpose only.
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*/
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#define SDMMC_SLOT_FLAG_WP_ACTIVE_HIGH BIT(1)
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/**< GPIO write protect polarity.
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* 0 means "active low", i.e. card is protected when the GPIO is low;
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* 1 means "active high", i.e. card is protected when GPIO is high.
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*/
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} sdmmc_slot_config_t;
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/**
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* @brief Initialize SDMMC host peripheral
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*
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* @note This function is not thread safe
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_STATE if sdmmc_host_init was already called
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* - ESP_ERR_NO_MEM if memory can not be allocated
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*/
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esp_err_t sdmmc_host_init(void);
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/**
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* @brief Initialize given slot of SDMMC peripheral
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*
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* On the ESP32, SDMMC peripheral has two slots:
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* - Slot 0: 8-bit wide, maps to HS1_* signals in PIN MUX
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* - Slot 1: 4-bit wide, maps to HS2_* signals in PIN MUX
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*
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* Card detect and write protect signals can be routed to
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* arbitrary GPIOs using GPIO matrix.
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*
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* @note This function is not thread safe
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param slot_config additional configuration for the slot
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_STATE if host has not been initialized using sdmmc_host_init
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*/
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esp_err_t sdmmc_host_init_slot(int slot, const sdmmc_slot_config_t* slot_config);
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/**
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* @brief Select bus width to be used for data transfer
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*
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* SD/MMC card must be initialized prior to this command, and a command to set
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* bus width has to be sent to the card (e.g. SD_APP_SET_BUS_WIDTH)
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*
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* @note This function is not thread safe
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param width bus width (1, 4, or 8 for slot 0; 1 or 4 for slot 1)
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if slot number or width is not valid
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*/
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esp_err_t sdmmc_host_set_bus_width(int slot, size_t width);
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/**
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* @brief Get bus width configured in ``sdmmc_host_init_slot`` to be used for data transfer
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @return configured bus width of the specified slot.
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*/
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size_t sdmmc_host_get_slot_width(int slot);
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/**
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* @brief Set card clock frequency
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*
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* Currently only integer fractions of 40MHz clock can be used.
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* For High Speed cards, 40MHz can be used.
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* For Default Speed cards, 20MHz can be used.
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*
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* @note This function is not thread safe
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param freq_khz card clock frequency, in kHz
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* @return
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* - ESP_OK on success
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* - other error codes may be returned in the future
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*/
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esp_err_t sdmmc_host_set_card_clk(int slot, uint32_t freq_khz);
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/**
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* @brief Enable or disable DDR mode of SD interface
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param ddr_enabled enable or disable DDR mode
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* @return
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* - ESP_OK on success
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* - ESP_ERR_NOT_SUPPORTED if DDR mode is not supported on this slot
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*/
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esp_err_t sdmmc_host_set_bus_ddr_mode(int slot, bool ddr_enabled);
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/**
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* @brief Enable or disable always-on card clock
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* When cclk_always_on is false, the host controller is allowed to shut down
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* the card clock between the commands. When cclk_always_on is true, the clock
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* is generated even if no command is in progress.
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* @param slot slot number
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* @param cclk_always_on enable or disable always-on clock
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if the slot number is invalid
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*/
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esp_err_t sdmmc_host_set_cclk_always_on(int slot, bool cclk_always_on);
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/**
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* @brief Send command to the card and get response
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*
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* This function returns when command is sent and response is received,
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* or data is transferred, or timeout occurs.
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*
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* @note This function is not thread safe w.r.t. init/deinit functions,
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* and bus width/clock speed configuration functions. Multiple tasks
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* can call sdmmc_host_do_transaction as long as other sdmmc_host_*
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* functions are not called.
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*
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* @attention Data buffer passed in cmdinfo->data must be in DMA capable memory and aligned to 4 byte boundary. If it's
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* behind the cache, both cmdinfo->data and cmdinfo->buflen need to be aligned to cache line boundary.
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param cmdinfo pointer to structure describing command and data to transfer
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* @return
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* - ESP_OK on success
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* - ESP_ERR_TIMEOUT if response or data transfer has timed out
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* - ESP_ERR_INVALID_CRC if response or data transfer CRC check has failed
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* - ESP_ERR_INVALID_RESPONSE if the card has sent an invalid response
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* - ESP_ERR_INVALID_SIZE if the size of data transfer is not valid in SD protocol
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* - ESP_ERR_INVALID_ARG if the data buffer is not in DMA capable memory
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*/
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esp_err_t sdmmc_host_do_transaction(int slot, sdmmc_command_t* cmdinfo);
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/**
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* @brief Enable IO interrupts
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*
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* This function configures the host to accept SDIO interrupts.
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @return returns ESP_OK, other errors possible in the future
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*/
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esp_err_t sdmmc_host_io_int_enable(int slot);
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/**
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* @brief Block until an SDIO interrupt is received, or timeout occurs
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param timeout_ticks number of RTOS ticks to wait for the interrupt
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* @return
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* - ESP_OK on success (interrupt received)
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* - ESP_ERR_TIMEOUT if the interrupt did not occur within timeout_ticks
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*/
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esp_err_t sdmmc_host_io_int_wait(int slot, TickType_t timeout_ticks);
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/**
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* @brief Disable SDMMC host and release allocated resources
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*
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* @note This function is not thread safe
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*
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_STATE if sdmmc_host_init function has not been called
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*/
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esp_err_t sdmmc_host_deinit(void);
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/**
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* @brief Provides a real frequency used for an SD card installed on specific slot
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* of SD/MMC host controller
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*
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* This function calculates real working frequency given by current SD/MMC host
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* controller setup for required slot: it reads associated host and card dividers
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* from corresponding SDMMC registers, calculates respective frequency and stores
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* the value into the 'real_freq_khz' parameter
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param[out] real_freq_khz output parameter for the result frequency (in kHz)
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG on real_freq_khz == NULL or invalid slot number used
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*/
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esp_err_t sdmmc_host_get_real_freq(int slot, int* real_freq_khz);
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/**
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* @brief set input delay
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*
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* @note ESP32 doesn't support this feature, you will get an `ESP_ERR_NOT_SUPPORTED`
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*
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* - This API sets delay when the SDMMC Host samples the signal from the SD Slave.
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* - This API will check if the given `delay_phase` is valid or not.
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* - This API will print out the delay time, in picosecond (ps)
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*
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* @param slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param delay_phase delay phase, this API will convert the phase into picoseconds and print it out
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*
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* @return
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* - ESP_OK: ON success.
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* - ESP_ERR_INVALID_ARG: Invalid argument.
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* - ESP_ERR_NOT_SUPPORTED: ESP32 doesn't support this feature.
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*/
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esp_err_t sdmmc_host_set_input_delay(int slot, sdmmc_delay_phase_t delay_phase);
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/**
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* @brief Get the DMA memory information for the host driver
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*
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* @param[in] slot slot number (SDMMC_HOST_SLOT_0 or SDMMC_HOST_SLOT_1)
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* @param[out] dma_mem_info DMA memory information structure
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* @return
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* - ESP_OK: ON success.
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* - ESP_ERR_INVALID_ARG: Invalid argument.
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*/
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esp_err_t sdmmc_host_get_dma_info(int slot, esp_dma_mem_info_t *dma_mem_info);
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#ifdef __cplusplus
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}
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#endif
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#endif //SOC_SDMMC_HOST_SUPPORTED
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