157 lines
4.9 KiB
C
157 lines
4.9 KiB
C
// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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 "sdmmc_types.h"
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#include "driver/gpio.h"
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#include "driver/spi_master.h"
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#include "driver/sdmmc_host.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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* @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' can be set to one of HSPI_HOST, VSPI_HOST.
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*/
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#define SDSPI_HOST_DEFAULT() {\
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.flags = SDMMC_HOST_FLAG_SPI, \
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.slot = HSPI_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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.set_card_clk = &sdspi_host_set_card_clk, \
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.do_transaction = &sdspi_host_do_transaction, \
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.deinit = &sdspi_host_deinit, \
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}
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/**
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* Extra configuration for SPI host
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*/
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typedef struct {
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gpio_num_t gpio_miso; ///< GPIO number of MISO signal
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gpio_num_t gpio_mosi; ///< GPIO number of MOSI signal
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gpio_num_t gpio_sck; ///< GPIO number of SCK signal
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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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int dma_channel; ///< DMA channel to be used by SPI driver (1 or 2)
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} sdspi_slot_config_t;
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#define SDSPI_SLOT_NO_CD ((gpio_num_t) -1) ///< indicates that card detect line is not used
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#define SDSPI_SLOT_NO_WP ((gpio_num_t) -1) ///< indicates that write protect line is not used
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/**
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* Macro defining default configuration of SPI host
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*/
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#define SDSPI_SLOT_CONFIG_DEFAULT() {\
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.gpio_miso = GPIO_NUM_2, \
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.gpio_mosi = GPIO_NUM_15, \
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.gpio_sck = GPIO_NUM_14, \
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.gpio_cs = GPIO_NUM_13, \
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.gpio_cd = SDMMC_SLOT_NO_CD, \
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.gpio_wp = SDMMC_SLOT_NO_WP, \
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.dma_channel = 1 \
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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();
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/**
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* @brief Initialize SD SPI driver for the specific SPI controller
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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 SPI controller to use (HSPI_HOST or VSPI_HOST)
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* @param slot_config pointer to slot configuration structure
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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 if sdspi_init_slot 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_slot(int slot, const sdspi_slot_config_t* slot_config);
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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 slot SPI controller (HSPI_HOST or VSPI_HOST)
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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(int slot, 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 slot SPI controller (HSPI_HOST or VSPI_HOST)
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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(int slot, uint32_t 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();
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#ifdef __cplusplus
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}
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#endif
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