esp-idf/components/driver/sdspi_private.h

// 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_CMD_FLAG_NORSP    BIT(6)  //!< Don't expect response (used when sending CMD0 first time).

#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);