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https://github.com/espressif/esp-idf.git
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215 lines
6.8 KiB
C
215 lines
6.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2021 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 <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/gpio.h"
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#include "driver/spi_master.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/// Handle representing an SD SPI device
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typedef int sdspi_dev_handle_t;
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#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
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#define SDSPI_DEFAULT_HOST HSPI_HOST
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#define SDSPI_DEFAULT_DMA SDSPI_DEFAULT_HOST
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#else
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#define SDSPI_DEFAULT_HOST SPI2_HOST
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#define SDSPI_DEFAULT_DMA SPI_DMA_CH_AUTO
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#endif
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/**
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* @brief Default sdmmc_host_t structure initializer for SD over SPI driver
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*
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* Uses SPI mode and max frequency set to 20MHz
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*
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* 'slot' should be set to an sdspi device initialized by `sdspi_host_init_device()`.
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*/
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#define SDSPI_HOST_DEFAULT() {\
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.flags = SDMMC_HOST_FLAG_SPI | SDMMC_HOST_FLAG_DEINIT_ARG, \
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.slot = SDSPI_DEFAULT_HOST, \
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.max_freq_khz = SDMMC_FREQ_DEFAULT, \
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.io_voltage = 3.3f, \
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.init = &sdspi_host_init, \
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.set_bus_width = NULL, \
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.get_bus_width = NULL, \
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.set_bus_ddr_mode = NULL, \
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.set_card_clk = &sdspi_host_set_card_clk, \
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.set_cclk_always_on = NULL, \
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.do_transaction = &sdspi_host_do_transaction, \
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.deinit_p = &sdspi_host_remove_device, \
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.io_int_enable = &sdspi_host_io_int_enable, \
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.io_int_wait = &sdspi_host_io_int_wait, \
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.command_timeout_ms = 0, \
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.get_real_freq = &sdspi_host_get_real_freq, \
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.input_delay_phase = SDMMC_DELAY_PHASE_0, \
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.set_input_delay = NULL \
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}
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/**
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* Extra configuration for SD SPI device.
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*/
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typedef struct {
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spi_host_device_t host_id; ///< SPI host to use, SPIx_HOST (see spi_types.h).
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gpio_num_t gpio_cs; ///< GPIO number of CS signal
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gpio_num_t gpio_cd; ///< GPIO number of card detect signal
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gpio_num_t gpio_wp; ///< GPIO number of write protect signal
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gpio_num_t gpio_int; ///< GPIO number of interrupt line (input) for SDIO card.
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bool gpio_wp_polarity; ///< 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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} sdspi_device_config_t;
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#define SDSPI_SLOT_NO_CS GPIO_NUM_NC ///< indicates that card select line is not used
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#define SDSPI_SLOT_NO_CD GPIO_NUM_NC ///< indicates that card detect line is not used
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#define SDSPI_SLOT_NO_WP GPIO_NUM_NC ///< indicates that write protect line is not used
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#define SDSPI_SLOT_NO_INT GPIO_NUM_NC ///< indicates that interrupt line is not used
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#define SDSPI_IO_ACTIVE_LOW 0
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/**
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* Macro defining default configuration of SD SPI device.
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*/
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#define SDSPI_DEVICE_CONFIG_DEFAULT() {\
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.host_id = SDSPI_DEFAULT_HOST, \
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.gpio_cs = GPIO_NUM_13, \
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.gpio_cd = SDSPI_SLOT_NO_CD, \
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.gpio_wp = SDSPI_SLOT_NO_WP, \
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.gpio_int = GPIO_NUM_NC, \
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.gpio_wp_polarity = SDSPI_IO_ACTIVE_LOW, \
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}
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/**
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* @brief Initialize SD SPI driver
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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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* - other error codes may be returned in future versions
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*/
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esp_err_t sdspi_host_init(void);
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/**
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* @brief Attach and initialize an SD SPI device on the specific SPI bus
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*
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* @note This function is not thread safe
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*
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* @note Initialize the SPI bus by `spi_bus_initialize()` before calling this function.
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*
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* @note The SDIO over sdspi needs an extra interrupt line. Call ``gpio_install_isr_service()`` before this function.
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*
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* @param dev_config pointer to device configuration structure
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* @param out_handle Output of the handle to the sdspi device.
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if sdspi_host_init_device has invalid arguments
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* - ESP_ERR_NO_MEM if memory can not be allocated
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* - other errors from the underlying spi_master and gpio drivers
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*/
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esp_err_t sdspi_host_init_device(const sdspi_device_config_t* dev_config, sdspi_dev_handle_t* out_handle);
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/**
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* @brief Remove an SD SPI device
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*
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* @param handle Handle of the SD SPI device
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* @return Always ESP_OK
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*/
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esp_err_t sdspi_host_remove_device(sdspi_dev_handle_t handle);
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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 sdspi_host_do_transaction as long as other sdspi_host_*
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* functions are not called.
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*
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* @param handle Handle of the sdspi device
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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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*/
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esp_err_t sdspi_host_do_transaction(sdspi_dev_handle_t handle, sdmmc_command_t *cmdinfo);
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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 host Handle of the sdspi device
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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 sdspi_host_set_card_clk(sdspi_dev_handle_t host, uint32_t freq_khz);
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/**
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* @brief Calculate working frequency for specific device
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*
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* @param handle SDSPI device handle
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* @param[out] real_freq_khz output parameter to hold the calculated frequency (in kHz)
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*
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* @return
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* - ESP_ERR_INVALID_ARG : ``handle`` is NULL or invalid or ``real_freq_khz`` parameter is NULL
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* - ESP_OK : Success
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*/
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esp_err_t sdspi_host_get_real_freq(sdspi_dev_handle_t handle, int* real_freq_khz);
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/**
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* @brief Release resources allocated using sdspi_host_init
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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 sdspi_host_init function has not been called
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*/
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esp_err_t sdspi_host_deinit(void);
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/**
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* @brief Enable SDIO interrupt.
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*
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* @param handle Handle of the sdspi device
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*
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* @return
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* - ESP_OK on success
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*/
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esp_err_t sdspi_host_io_int_enable(sdspi_dev_handle_t handle);
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/**
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* @brief Wait for SDIO interrupt until timeout.
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*
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* @param handle Handle of the sdspi device
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* @param timeout_ticks Ticks to wait before timeout.
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*
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* @return
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* - ESP_OK on success
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*/
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esp_err_t sdspi_host_io_int_wait(sdspi_dev_handle_t handle, TickType_t timeout_ticks);
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#ifdef __cplusplus
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}
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#endif
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