esp-idf/components/driver/sdspi_private.h

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// Copyright 2015-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <stdint.h>
#include <stddef.h>
#include "esp_err.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
/// Control tokens used to frame data transfers
/// (see section 7.3.3 of SD simplified spec)
/// Token sent before single/multi block reads and single block writes
#define TOKEN_BLOCK_START 0b11111110
/// Token sent before multi block writes
#define TOKEN_BLOCK_START_WRITE_MULTI 0b11111100
/// Token used to stop multi block write (for reads, CMD12 is used instead)
#define TOKEN_BLOCK_STOP_WRITE_MULTI 0b11111101
/// Data response tokens
/// Mask (high 3 bits are undefined for data response tokens)
#define TOKEN_RSP_MASK 0b11111
/// Data accepted
#define TOKEN_RSP_OK 0b00101
/// Data rejected due to CRC error
#define TOKEN_RSP_CRC_ERR 0b01011
/// Data rejected due to write error
#define TOKEN_RSP_WRITE_ERR 0b01101
/// Data error tokens have format 0b0000xyzw where xyzw are signle bit flags.
/// MASK and VAL are used to check if a token is an error token
#define TOKEN_ERR_MASK 0b11110000
#define TOKEN_ERR_VAL 0b00000000
/// Argument is out of range
#define TOKEN_ERR_RANGE BIT(3)
/// Card internal ECC error
#define TOKEN_ERR_CARD_ECC BIT(2)
/// Card controller error
#define TOKEN_ERR_INTERNAL BIT(1)
/// Card is locked
#define TOKEN_ERR_LOCKED BIT(0)
/// Transfer format in SPI mode. See section 7.3.1.1 of SD simplified spec.
typedef struct {
// These fields form the command sent from host to the card (6 bytes)
uint8_t cmd_index : 6;
uint8_t transmission_bit : 1;
uint8_t start_bit : 1;
uint8_t arguments[4];
uint8_t stop_bit : 1;
uint8_t crc7 : 7;
/// Ncr is the dead time between command and response; should be 0xff
uint8_t ncr;
/// Response data, should be set by host to 0xff for read operations
uint8_t r1;
/// Up to 16 bytes of response. Luckily, this is aligned on 4 byte boundary.
uint32_t response[4];
/// response timeout, in milliseconds
int timeout_ms;
} sdspi_hw_cmd_t;
#define SDSPI_CMD_NORESP_SIZE 6 //!< Size of the command without any response
#define SDSPI_CMD_R1_SIZE 8 //!< Size of the command with R1 response
#define SDSPI_CMD_R2_SIZE 9 //!< Size of the command with R1b response
#define SDSPI_CMD_R3_SIZE 12 //!< Size of the command with R3 response
#define SDSPI_CMD_R7_SIZE 12 //!< Size of the command with R7 response
#define SDSPI_CMD_FLAG_DATA BIT(0) //!< Command has data transfer
#define SDSPI_CMD_FLAG_WRITE BIT(1) //!< Data is written to the card
#define SDSPI_CMD_FLAG_RSP_R1 BIT(2) //!< Response format R1 (1 byte)
#define SDSPI_CMD_FLAG_RSP_R2 BIT(3) //!< Response format R2 (2 bytes)
#define SDSPI_CMD_FLAG_RSP_R3 BIT(4) //!< Response format R3 (5 bytes)
#define SDSPI_CMD_FLAG_RSP_R7 BIT(5) //!< Response format R7 (5 bytes)
#define SDSPI_MAX_DATA_LEN 512 //!< Max size of single block transfer
void make_hw_cmd(uint32_t opcode, uint32_t arg, int timeout_ms, sdspi_hw_cmd_t *hw_cmd);
esp_err_t sdspi_host_start_command(int slot, sdspi_hw_cmd_t *cmd,
void *data, uint32_t data_size, int flags);