unleashed-firmware/firmware/targets/f7/fatfs/stm32_adafruit_sd.c

/**
  ******************************************************************************
  * @file    stm32_adafruit_sd.c
  * @author  MCD Application Team
  * @version V3.0.0
  * @date    23-December-2016
  * @brief   This file provides a set of functions needed to manage the SD card
  *          mounted on the Adafruit 1.8" TFT LCD shield (reference ID 802),
  *          that is used with the STM32 Nucleo board through SPI interface.
  *          It implements a high level communication layer for read and write 
  *          from/to this memory. The needed STM32XXxx hardware resources (SPI and 
  *          GPIO) are defined in stm32XXxx_nucleo.h file, and the initialization is 
  *          performed in SD_IO_Init() function declared in stm32XXxx_nucleo.c 
  *          file.
  *          You can easily tailor this driver to any other development board, 
  *          by just adapting the defines for hardware resources and 
  *          SD_IO_Init() function.
  *            
  *          +-------------------------------------------------------+
  *          |                     Pin assignment                    |
  *          +-------------------------+---------------+-------------+
  *          |  STM32XXxx SPI Pins     |     SD        |    Pin      |
  *          +-------------------------+---------------+-------------+
  *          | SD_SPI_CS_PIN           |   ChipSelect  |    1        |
  *          | SD_SPI_MOSI_PIN / MOSI  |   DataIn      |    2        |
  *          |                         |   GND         |    3 (0 V)  |
  *          |                         |   VDD         |    4 (3.3 V)|
  *          | SD_SPI_SCK_PIN / SCLK   |   Clock       |    5        |
  *          |                         |   GND         |    6 (0 V)  |
  *          | SD_SPI_MISO_PIN / MISO  |   DataOut     |    7        |
  *          +-------------------------+---------------+-------------+
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* File Info : -----------------------------------------------------------------
                                   User NOTES
1. How to use this driver:
--------------------------
   - This driver does not need a specific component driver for the micro SD device
     to be included with.

2. Driver description:
---------------------
  + Initialization steps:
     o Initialize the micro SD card using the BSP_SD_Init() function. 
     o Checking the SD card presence is not managed because SD detection pin is
       not physically mapped on the Adafruit shield.
     o The function BSP_SD_GetCardInfo() is used to get the micro SD card information 
       which is stored in the structure "SD_CardInfo".
  
  + Micro SD card operations
     o The micro SD card can be accessed with read/write block(s) operations once 
       it is ready for access. The access can be performed in polling 
       mode by calling the functions BSP_SD_ReadBlocks()/BSP_SD_WriteBlocks()
       
     o The SD erase block(s) is performed using the function BSP_SD_Erase() with 
       specifying the number of blocks to erase.
     o The SD runtime status is returned when calling the function BSP_SD_GetStatus().
     
------------------------------------------------------------------------------*/

/* Includes ------------------------------------------------------------------*/
#include "stm32_adafruit_sd.h"
#include "stdlib.h"
#include "string.h"
#include "stdio.h"
#include <furi-hal.h>

/** @addtogroup BSP
  * @{
  */

/** @addtogroup STM32_ADAFRUIT
  * @{
  */

/** @defgroup STM32_ADAFRUIT_SD
  * @{
  */

/* Private typedef -----------------------------------------------------------*/

/** @defgroup STM32_ADAFRUIT_SD_Private_Types_Definitions
  * @{
  */
typedef struct {
    uint8_t r1;
    uint8_t r2;
    uint8_t r3;
    uint8_t r4;
    uint8_t r5;
} SD_CmdAnswer_typedef;

/**
  * @}
  */

/* Private define ------------------------------------------------------------*/

/** @defgroup STM32_ADAFRUIT_SD_Private_Defines
  * @{
  */
#define SD_DUMMY_BYTE 0xFF

#define SD_MAX_FRAME_LENGTH 17 /* Lenght = 16 + 1 */
#define SD_CMD_LENGTH 6

#define SD_MAX_TRY 100 /* Number of try */

#define SD_CSD_STRUCT_V1 0x2 /* CSD struct version V1 */
#define SD_CSD_STRUCT_V2 0x1 /* CSD struct version V2 */

/**
  * @brief  SD ansewer format
  */
typedef enum {
    SD_ANSWER_R1_EXPECTED,
    SD_ANSWER_R1B_EXPECTED,
    SD_ANSWER_R2_EXPECTED,
    SD_ANSWER_R3_EXPECTED,
    SD_ANSWER_R4R5_EXPECTED,
    SD_ANSWER_R7_EXPECTED,
} SD_Answer_type;

/**
  * @brief  Start Data tokens:
  *         Tokens (necessary because at nop/idle (and CS active) only 0xff is 
  *         on the data/command line)  
  */
#define SD_TOKEN_START_DATA_SINGLE_BLOCK_READ \
    0xFE /* Data token start byte, Start Single Block Read */
#define SD_TOKEN_START_DATA_MULTIPLE_BLOCK_READ \
    0xFE /* Data token start byte, Start Multiple Block Read */
#define SD_TOKEN_START_DATA_SINGLE_BLOCK_WRITE \
    0xFE /* Data token start byte, Start Single Block Write */
#define SD_TOKEN_START_DATA_MULTIPLE_BLOCK_WRITE \
    0xFD /* Data token start byte, Start Multiple Block Write */
#define SD_TOKEN_STOP_DATA_MULTIPLE_BLOCK_WRITE \
    0xFD /* Data toke stop byte, Stop Multiple Block Write */

/**
  * @brief  Commands: CMDxx = CMD-number | 0x40
  */
#define SD_CMD_GO_IDLE_STATE 0 /* CMD0 = 0x40  */
#define SD_CMD_SEND_OP_COND 1 /* CMD1 = 0x41  */
#define SD_CMD_SEND_IF_COND 8 /* CMD8 = 0x48  */
#define SD_CMD_SEND_CSD 9 /* CMD9 = 0x49  */
#define SD_CMD_SEND_CID 10 /* CMD10 = 0x4A */
#define SD_CMD_STOP_TRANSMISSION 12 /* CMD12 = 0x4C */
#define SD_CMD_SEND_STATUS 13 /* CMD13 = 0x4D */
#define SD_CMD_SET_BLOCKLEN 16 /* CMD16 = 0x50 */
#define SD_CMD_READ_SINGLE_BLOCK 17 /* CMD17 = 0x51 */
#define SD_CMD_READ_MULT_BLOCK 18 /* CMD18 = 0x52 */
#define SD_CMD_SET_BLOCK_COUNT 23 /* CMD23 = 0x57 */
#define SD_CMD_WRITE_SINGLE_BLOCK 24 /* CMD24 = 0x58 */
#define SD_CMD_WRITE_MULT_BLOCK 25 /* CMD25 = 0x59 */
#define SD_CMD_PROG_CSD 27 /* CMD27 = 0x5B */
#define SD_CMD_SET_WRITE_PROT 28 /* CMD28 = 0x5C */
#define SD_CMD_CLR_WRITE_PROT 29 /* CMD29 = 0x5D */
#define SD_CMD_SEND_WRITE_PROT 30 /* CMD30 = 0x5E */
#define SD_CMD_SD_ERASE_GRP_START 32 /* CMD32 = 0x60 */
#define SD_CMD_SD_ERASE_GRP_END 33 /* CMD33 = 0x61 */
#define SD_CMD_UNTAG_SECTOR 34 /* CMD34 = 0x62 */
#define SD_CMD_ERASE_GRP_START 35 /* CMD35 = 0x63 */
#define SD_CMD_ERASE_GRP_END 36 /* CMD36 = 0x64 */
#define SD_CMD_UNTAG_ERASE_GROUP 37 /* CMD37 = 0x65 */
#define SD_CMD_ERASE 38 /* CMD38 = 0x66 */
#define SD_CMD_SD_APP_OP_COND 41 /* CMD41 = 0x69 */
#define SD_CMD_APP_CMD 55 /* CMD55 = 0x77 */
#define SD_CMD_READ_OCR 58 /* CMD55 = 0x79 */

/**
  * @brief  SD reponses and error flags
  */
typedef enum {
    /* R1 answer value */
    SD_R1_NO_ERROR = (0x00),
    SD_R1_IN_IDLE_STATE = (0x01),
    SD_R1_ERASE_RESET = (0x02),
    SD_R1_ILLEGAL_COMMAND = (0x04),
    SD_R1_COM_CRC_ERROR = (0x08),
    SD_R1_ERASE_SEQUENCE_ERROR = (0x10),
    SD_R1_ADDRESS_ERROR = (0x20),
    SD_R1_PARAMETER_ERROR = (0x40),

    /* R2 answer value */
    SD_R2_NO_ERROR = 0x00,
    SD_R2_CARD_LOCKED = 0x01,
    SD_R2_LOCKUNLOCK_ERROR = 0x02,
    SD_R2_ERROR = 0x04,
    SD_R2_CC_ERROR = 0x08,
    SD_R2_CARD_ECC_FAILED = 0x10,
    SD_R2_WP_VIOLATION = 0x20,
    SD_R2_ERASE_PARAM = 0x40,
    SD_R2_OUTOFRANGE = 0x80,

    /**
  * @brief  Data response error
  */
    SD_DATA_OK = (0x05),
    SD_DATA_CRC_ERROR = (0x0B),
    SD_DATA_WRITE_ERROR = (0x0D),
    SD_DATA_OTHER_ERROR = (0xFF)
} SD_Error;

/**
  * @}
  */

/* Private macro -------------------------------------------------------------*/

/** @defgroup STM32_ADAFRUIT_SD_Private_Macros
  * @{
  */

/**
  * @}
  */

/* Private variables ---------------------------------------------------------*/

/** @defgroup STM32_ADAFRUIT_SD_Private_Variables
  * @{
  */
__IO uint8_t SdStatus = SD_NOT_PRESENT;

/* flag_SDHC :
      0 :  Standard capacity
      1 : High capacity
*/
uint16_t flag_SDHC = 0;

/**
  * @}
  */

/* Private function prototypes -----------------------------------------------*/
static uint8_t SD_GetCIDRegister(SD_CID* Cid);
static uint8_t SD_GetCSDRegister(SD_CSD* Csd);
static uint8_t SD_GetDataResponse(void);
static uint8_t SD_GoIdleState(void);
static SD_CmdAnswer_typedef SD_SendCmd(uint8_t Cmd, uint32_t Arg, uint8_t Crc, uint8_t Answer);
static uint8_t SD_WaitData(uint8_t data);
static uint8_t SD_ReadData(void);
/** @defgroup STM32_ADAFRUIT_SD_Private_Function_Prototypes
  * @{
  */
/**
  * @}
  */

/* Private functions ---------------------------------------------------------*/

void SD_SPI_Bus_To_Down_State(){
    hal_gpio_init_ex(furi_hal_sd_spi_handle->miso, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh, GpioAltFnUnused);
    hal_gpio_init_ex(furi_hal_sd_spi_handle->mosi, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh, GpioAltFnUnused);
    hal_gpio_init_ex(furi_hal_sd_spi_handle->sck, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh, GpioAltFnUnused);

    hal_gpio_write(furi_hal_sd_spi_handle->cs, false);
    hal_gpio_write(furi_hal_sd_spi_handle->miso, false);
    hal_gpio_write(furi_hal_sd_spi_handle->mosi, false);
    hal_gpio_write(furi_hal_sd_spi_handle->sck, false);
}

void SD_SPI_Bus_To_Normal_State(){
    hal_gpio_write(furi_hal_sd_spi_handle->cs, true);

    hal_gpio_init_ex(furi_hal_sd_spi_handle->miso, GpioModeAltFunctionPushPull, GpioPullUp, GpioSpeedVeryHigh, GpioAltFn5SPI2);
    hal_gpio_init_ex(furi_hal_sd_spi_handle->mosi, GpioModeAltFunctionPushPull, GpioPullUp, GpioSpeedVeryHigh, GpioAltFn5SPI2);
    hal_gpio_init_ex(furi_hal_sd_spi_handle->sck, GpioModeAltFunctionPushPull, GpioPullUp, GpioSpeedVeryHigh, GpioAltFn5SPI2);
}

/** @defgroup STM32_ADAFRUIT_SD_Private_Functions
  * @{
  */

/**
  * @brief  Initializes the SD/SD communication.
  * @param  None
  * @retval The SD Response: 
  *         - MSD_ERROR: Sequence failed
  *         - MSD_OK: Sequence succeed
  */
uint8_t BSP_SD_Init(bool reset_card) {
    /* Slow speed init */
    furi_hal_spi_acquire(&furi_hal_spi_bus_handle_sd_slow);
    furi_hal_sd_spi_handle = &furi_hal_spi_bus_handle_sd_slow;

    /* We must reset card in spi_lock context */
    if(reset_card) {
        /* disable power and set low on all bus pins */
        furi_hal_power_disable_external_3_3v();
        SD_SPI_Bus_To_Down_State();
        hal_sd_detect_set_low();
        delay(250);

        /* reinit bus and enable power */
        SD_SPI_Bus_To_Normal_State();
        hal_sd_detect_init();
        furi_hal_power_enable_external_3_3v();
        delay(100);
    }

    /* Configure IO functionalities for SD pin */
    SD_IO_Init();

    /* SD detection pin is not physically mapped on the Adafruit shield */
    SdStatus = SD_PRESENT;
    uint8_t res = BSP_SD_ERROR;

    for(uint8_t i = 0; i < 128; i++) {
        res = SD_GoIdleState();
        if(res == BSP_SD_OK) break;
    }

    furi_hal_sd_spi_handle = NULL;
    furi_hal_spi_release(&furi_hal_spi_bus_handle_sd_slow);

    /* SD initialized and set to SPI mode properly */
    return res;
}

/**
  * @brief  Returns information about specific card.
  * @param  pCardInfo: Pointer to a SD_CardInfo structure that contains all SD 
  *         card information.
  * @retval The SD Response:
  *         - MSD_ERROR: Sequence failed
  *         - MSD_OK: Sequence succeed
  */
uint8_t BSP_SD_GetCardInfo(SD_CardInfo* pCardInfo) {
    uint8_t status;

    status = SD_GetCSDRegister(&(pCardInfo->Csd));
    status |= SD_GetCIDRegister(&(pCardInfo->Cid));
    if(flag_SDHC == 1) {
        pCardInfo->LogBlockSize = 512;
        pCardInfo->CardBlockSize = 512;
        pCardInfo->CardCapacity = ((uint64_t)pCardInfo->Csd.version.v2.DeviceSize + 1UL) * 1024UL *
                                  (uint64_t)pCardInfo->LogBlockSize;
        pCardInfo->LogBlockNbr = (pCardInfo->CardCapacity) / (pCardInfo->LogBlockSize);
    } else {
        pCardInfo->CardCapacity = (pCardInfo->Csd.version.v1.DeviceSize + 1);
        pCardInfo->CardCapacity *= (1 << (pCardInfo->Csd.version.v1.DeviceSizeMul + 2));
        pCardInfo->LogBlockSize = 512;
        pCardInfo->CardBlockSize = 1 << (pCardInfo->Csd.RdBlockLen);
        pCardInfo->CardCapacity *= pCardInfo->CardBlockSize;
        pCardInfo->LogBlockNbr = (pCardInfo->CardCapacity) / (pCardInfo->LogBlockSize);
    }

    return status;
}

/**
  * @brief  Reads block(s) from a specified address in the SD card, in polling mode. 
  * @param  pData: Pointer to the buffer that will contain the data to transmit
  * @param  ReadAddr: Address from where data is to be read. The address is counted 
  *                   in blocks of 512bytes
  * @param  NumOfBlocks: Number of SD blocks to read
  * @param  Timeout: This parameter is used for compatibility with BSP implementation
  * @retval SD status
  */
uint8_t
BSP_SD_ReadBlocks(uint32_t* pData, uint32_t ReadAddr, uint32_t NumOfBlocks, uint32_t Timeout) {
    uint32_t offset = 0;
    uint32_t addr;
    uint8_t retr = BSP_SD_ERROR;
    uint8_t* ptr = NULL;
    SD_CmdAnswer_typedef response;
    uint16_t BlockSize = 512;

    /* Send CMD16 (SD_CMD_SET_BLOCKLEN) to set the size of the block and 
     Check if the SD acknowledged the set block length command: R1 response (0x00: no errors) */
    response = SD_SendCmd(SD_CMD_SET_BLOCKLEN, BlockSize, 0xFF, SD_ANSWER_R1_EXPECTED);
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);
    if(response.r1 != SD_R1_NO_ERROR) {
        goto error;
    }

    ptr = malloc(sizeof(uint8_t) * BlockSize);
    if(ptr == NULL) {
        goto error;
    }
    memset(ptr, SD_DUMMY_BYTE, sizeof(uint8_t) * BlockSize);

    /* Initialize the address */
    addr = (ReadAddr * ((flag_SDHC == 1) ? 1 : BlockSize));

    /* Data transfer */
    while(NumOfBlocks--) {
        /* Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
        /* Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
        response = SD_SendCmd(SD_CMD_READ_SINGLE_BLOCK, addr, 0xFF, SD_ANSWER_R1_EXPECTED);
        if(response.r1 != SD_R1_NO_ERROR) {
            goto error;
        }

        /* Now look for the data token to signify the start of the data */
        if(SD_WaitData(SD_TOKEN_START_DATA_SINGLE_BLOCK_READ) == BSP_SD_OK) {
            /* Read the SD block data : read NumByteToRead data */
            SD_IO_WriteReadData(ptr, (uint8_t*)pData + offset, BlockSize);

            /* Set next read address*/
            offset += BlockSize;
            addr = ((flag_SDHC == 1) ? (addr + 1) : (addr + BlockSize));

            /* get CRC bytes (not really needed by us, but required by SD) */
            SD_IO_WriteByte(SD_DUMMY_BYTE);
            SD_IO_WriteByte(SD_DUMMY_BYTE);
        } else {
            goto error;
        }

        /* End the command data read cycle */
        SD_IO_CSState(1);
        SD_IO_WriteByte(SD_DUMMY_BYTE);
    }

    retr = BSP_SD_OK;

error:
    /* Send dummy byte: 8 Clock pulses of delay */
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);
    if(ptr != NULL) free(ptr);

    /* Return the reponse */
    return retr;
}

/**
  * @brief  Writes block(s) to a specified address in the SD card, in polling mode. 
  * @param  pData: Pointer to the buffer that will contain the data to transmit
  * @param  WriteAddr: Address from where data is to be written. The address is counted 
  *                   in blocks of 512bytes
  * @param  NumOfBlocks: Number of SD blocks to write
  * @param  Timeout: This parameter is used for compatibility with BSP implementation
  * @retval SD status
  */
uint8_t
BSP_SD_WriteBlocks(uint32_t* pData, uint32_t WriteAddr, uint32_t NumOfBlocks, uint32_t Timeout) {
    uint32_t offset = 0;
    uint32_t addr;
    uint8_t retr = BSP_SD_ERROR;
    uint8_t* ptr = NULL;
    SD_CmdAnswer_typedef response;
    uint16_t BlockSize = 512;

    /* Send CMD16 (SD_CMD_SET_BLOCKLEN) to set the size of the block and 
     Check if the SD acknowledged the set block length command: R1 response (0x00: no errors) */
    response = SD_SendCmd(SD_CMD_SET_BLOCKLEN, BlockSize, 0xFF, SD_ANSWER_R1_EXPECTED);
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);
    if(response.r1 != SD_R1_NO_ERROR) {
        goto error;
    }

    ptr = malloc(sizeof(uint8_t) * BlockSize);
    if(ptr == NULL) {
        goto error;
    }

    /* Initialize the address */
    addr = (WriteAddr * ((flag_SDHC == 1) ? 1 : BlockSize));

    /* Data transfer */
    while(NumOfBlocks--) {
        /* Send CMD24 (SD_CMD_WRITE_SINGLE_BLOCK) to write blocks  and
       Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
        response = SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, addr, 0xFF, SD_ANSWER_R1_EXPECTED);
        if(response.r1 != SD_R1_NO_ERROR) {
            goto error;
        }

        /* Send dummy byte for NWR timing : one byte between CMDWRITE and TOKEN */
        SD_IO_WriteByte(SD_DUMMY_BYTE);
        SD_IO_WriteByte(SD_DUMMY_BYTE);

        /* Send the data token to signify the start of the data */
        SD_IO_WriteByte(SD_TOKEN_START_DATA_SINGLE_BLOCK_WRITE);

        /* Write the block data to SD */
        SD_IO_WriteReadData((uint8_t*)pData + offset, ptr, BlockSize);

        /* Set next write address */
        offset += BlockSize;
        addr = ((flag_SDHC == 1) ? (addr + 1) : (addr + BlockSize));
        
        /* Put CRC bytes (not really needed by us, but required by SD) */
        SD_IO_WriteByte(SD_DUMMY_BYTE);
        SD_IO_WriteByte(SD_DUMMY_BYTE);

        /* Read data response */
        if(SD_GetDataResponse() != SD_DATA_OK) {
            /* Set response value to failure */
            goto error;
        }

        SD_IO_CSState(1);
        SD_IO_WriteByte(SD_DUMMY_BYTE);
    }
    retr = BSP_SD_OK;

error:
    if(ptr != NULL) free(ptr);
    /* Send dummy byte: 8 Clock pulses of delay */
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);

    /* Return the reponse */
    return retr;
}

/**
  * @brief  Erases the specified memory area of the given SD card. 
  * @param  StartAddr: Start address in Blocks (Size of a block is 512bytes)
  * @param  EndAddr: End address in Blocks (Size of a block is 512bytes)
  * @retval SD status
  */
uint8_t BSP_SD_Erase(uint32_t StartAddr, uint32_t EndAddr) {
    uint8_t retr = BSP_SD_ERROR;
    SD_CmdAnswer_typedef response;
    uint16_t BlockSize = 512;

    /* Send CMD32 (Erase group start) and check if the SD acknowledged the erase command: R1 response (0x00: no errors) */
    response = SD_SendCmd(
        SD_CMD_SD_ERASE_GRP_START,
        (StartAddr) * (flag_SDHC == 1 ? 1 : BlockSize),
        0xFF,
        SD_ANSWER_R1_EXPECTED);
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);
    if(response.r1 == SD_R1_NO_ERROR) {
        /* Send CMD33 (Erase group end) and Check if the SD acknowledged the erase command: R1 response (0x00: no errors) */
        response = SD_SendCmd(
            SD_CMD_SD_ERASE_GRP_END,
            (EndAddr * 512) * (flag_SDHC == 1 ? 1 : BlockSize),
            0xFF,
            SD_ANSWER_R1_EXPECTED);
        SD_IO_CSState(1);
        SD_IO_WriteByte(SD_DUMMY_BYTE);
        if(response.r1 == SD_R1_NO_ERROR) {
            /* Send CMD38 (Erase) and Check if the SD acknowledged the erase command: R1 response (0x00: no errors) */
            response = SD_SendCmd(SD_CMD_ERASE, 0, 0xFF, SD_ANSWER_R1B_EXPECTED);
            if(response.r1 == SD_R1_NO_ERROR) {
                retr = BSP_SD_OK;
            }
            SD_IO_CSState(1);
            SD_IO_WriteByte(SD_DUMMY_BYTE);
        }
    }

    /* Return the reponse */
    return retr;
}

/**
  * @brief  Returns the SD status.
  * @param  None
  * @retval The SD status.
  */
uint8_t BSP_SD_GetCardState(void) {
    SD_CmdAnswer_typedef retr;

    /* Send CMD13 (SD_SEND_STATUS) to get SD status */
    retr = SD_SendCmd(SD_CMD_SEND_STATUS, 0, 0xFF, SD_ANSWER_R2_EXPECTED);
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);

    /* Find SD status according to card state */
    if((retr.r1 == SD_R1_NO_ERROR) && (retr.r2 == SD_R2_NO_ERROR)) {
        return BSP_SD_OK;
    }

    return BSP_SD_ERROR;
}

/**
  * @brief  Reads the SD card SCD register.
  *         Reading the contents of the CSD register in SPI mode is a simple 
  *         read-block transaction.
  * @param  Csd: pointer on an SCD register structure
  * @retval SD status
  */
uint8_t SD_GetCSDRegister(SD_CSD* Csd) {
    uint16_t counter = 0;
    uint8_t CSD_Tab[16];
    uint8_t retr = BSP_SD_ERROR;
    SD_CmdAnswer_typedef response;

    /* Send CMD9 (CSD register) or CMD10(CSD register) and Wait for response in the R1 format (0x00 is no errors) */
    response = SD_SendCmd(SD_CMD_SEND_CSD, 0, 0xFF, SD_ANSWER_R1_EXPECTED);
    if(response.r1 == SD_R1_NO_ERROR) {
        if(SD_WaitData(SD_TOKEN_START_DATA_SINGLE_BLOCK_READ) == BSP_SD_OK) {
            for(counter = 0; counter < 16; counter++) {
                /* Store CSD register value on CSD_Tab */
                CSD_Tab[counter] = SD_IO_WriteByte(SD_DUMMY_BYTE);
            }

            /* Get CRC bytes (not really needed by us, but required by SD) */
            SD_IO_WriteByte(SD_DUMMY_BYTE);
            SD_IO_WriteByte(SD_DUMMY_BYTE);

            /*************************************************************************
        CSD header decoding 
      *************************************************************************/

            /* Byte 0 */
            Csd->CSDStruct = (CSD_Tab[0] & 0xC0) >> 6;
            Csd->Reserved1 = CSD_Tab[0] & 0x3F;

            /* Byte 1 */
            Csd->TAAC = CSD_Tab[1];

            /* Byte 2 */
            Csd->NSAC = CSD_Tab[2];

            /* Byte 3 */
            Csd->MaxBusClkFrec = CSD_Tab[3];

            /* Byte 4/5 */
            Csd->CardComdClasses = (CSD_Tab[4] << 4) | ((CSD_Tab[5] & 0xF0) >> 4);
            Csd->RdBlockLen = CSD_Tab[5] & 0x0F;

            /* Byte 6 */
            Csd->PartBlockRead = (CSD_Tab[6] & 0x80) >> 7;
            Csd->WrBlockMisalign = (CSD_Tab[6] & 0x40) >> 6;
            Csd->RdBlockMisalign = (CSD_Tab[6] & 0x20) >> 5;
            Csd->DSRImpl = (CSD_Tab[6] & 0x10) >> 4;

            /*************************************************************************
        CSD v1/v2 decoding  
      *************************************************************************/

            if(flag_SDHC == 0) {
                Csd->version.v1.Reserved1 = ((CSD_Tab[6] & 0x0C) >> 2);

                Csd->version.v1.DeviceSize = ((CSD_Tab[6] & 0x03) << 10) | (CSD_Tab[7] << 2) |
                                             ((CSD_Tab[8] & 0xC0) >> 6);
                Csd->version.v1.MaxRdCurrentVDDMin = (CSD_Tab[8] & 0x38) >> 3;
                Csd->version.v1.MaxRdCurrentVDDMax = (CSD_Tab[8] & 0x07);
                Csd->version.v1.MaxWrCurrentVDDMin = (CSD_Tab[9] & 0xE0) >> 5;
                Csd->version.v1.MaxWrCurrentVDDMax = (CSD_Tab[9] & 0x1C) >> 2;
                Csd->version.v1.DeviceSizeMul = ((CSD_Tab[9] & 0x03) << 1) |
                                                ((CSD_Tab[10] & 0x80) >> 7);
            } else {
                Csd->version.v2.Reserved1 = ((CSD_Tab[6] & 0x0F) << 2) |
                                            ((CSD_Tab[7] & 0xC0) >> 6);
                Csd->version.v2.DeviceSize = ((CSD_Tab[7] & 0x3F) << 16) | (CSD_Tab[8] << 8) |
                                             CSD_Tab[9];
                Csd->version.v2.Reserved2 = ((CSD_Tab[10] & 0x80) >> 8);
            }

            Csd->EraseSingleBlockEnable = (CSD_Tab[10] & 0x40) >> 6;
            Csd->EraseSectorSize = ((CSD_Tab[10] & 0x3F) << 1) | ((CSD_Tab[11] & 0x80) >> 7);
            Csd->WrProtectGrSize = (CSD_Tab[11] & 0x7F);
            Csd->WrProtectGrEnable = (CSD_Tab[12] & 0x80) >> 7;
            Csd->Reserved2 = (CSD_Tab[12] & 0x60) >> 5;
            Csd->WrSpeedFact = (CSD_Tab[12] & 0x1C) >> 2;
            Csd->MaxWrBlockLen = ((CSD_Tab[12] & 0x03) << 2) | ((CSD_Tab[13] & 0xC0) >> 6);
            Csd->WriteBlockPartial = (CSD_Tab[13] & 0x20) >> 5;
            Csd->Reserved3 = (CSD_Tab[13] & 0x1F);
            Csd->FileFormatGrouop = (CSD_Tab[14] & 0x80) >> 7;
            Csd->CopyFlag = (CSD_Tab[14] & 0x40) >> 6;
            Csd->PermWrProtect = (CSD_Tab[14] & 0x20) >> 5;
            Csd->TempWrProtect = (CSD_Tab[14] & 0x10) >> 4;
            Csd->FileFormat = (CSD_Tab[14] & 0x0C) >> 2;
            Csd->Reserved4 = (CSD_Tab[14] & 0x03);
            Csd->crc = (CSD_Tab[15] & 0xFE) >> 1;
            Csd->Reserved5 = (CSD_Tab[15] & 0x01);

            retr = BSP_SD_OK;
        }
    }

    /* Send dummy byte: 8 Clock pulses of delay */
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);

    /* Return the reponse */
    return retr;
}

/**
  * @brief  Reads the SD card CID register.
  *         Reading the contents of the CID register in SPI mode is a simple 
  *         read-block transaction.
  * @param  Cid: pointer on an CID register structure
  * @retval SD status
  */
uint8_t SD_GetCIDRegister(SD_CID* Cid) {
    uint32_t counter = 0;
    uint8_t retr = BSP_SD_ERROR;
    uint8_t CID_Tab[16];
    SD_CmdAnswer_typedef response;

    /* Send CMD10 (CID register) and Wait for response in the R1 format (0x00 is no errors) */
    response = SD_SendCmd(SD_CMD_SEND_CID, 0, 0xFF, SD_ANSWER_R1_EXPECTED);
    if(response.r1 == SD_R1_NO_ERROR) {
        if(SD_WaitData(SD_TOKEN_START_DATA_SINGLE_BLOCK_READ) == BSP_SD_OK) {
            /* Store CID register value on CID_Tab */
            for(counter = 0; counter < 16; counter++) {
                CID_Tab[counter] = SD_IO_WriteByte(SD_DUMMY_BYTE);
            }

            /* Get CRC bytes (not really needed by us, but required by SD) */
            SD_IO_WriteByte(SD_DUMMY_BYTE);
            SD_IO_WriteByte(SD_DUMMY_BYTE);

            /* Byte 0 */
            Cid->ManufacturerID = CID_Tab[0];

            /* Byte 1 */
            Cid->OEM_AppliID = CID_Tab[1] << 8;

            /* Byte 2 */
            Cid->OEM_AppliID |= CID_Tab[2];

            /* Byte 3 */
            Cid->ProdName1 = CID_Tab[3] << 24;

            /* Byte 4 */
            Cid->ProdName1 |= CID_Tab[4] << 16;

            /* Byte 5 */
            Cid->ProdName1 |= CID_Tab[5] << 8;

            /* Byte 6 */
            Cid->ProdName1 |= CID_Tab[6];

            /* Byte 7 */
            Cid->ProdName2 = CID_Tab[7];

            /* Byte 8 */
            Cid->ProdRev = CID_Tab[8];

            /* Byte 9 */
            Cid->ProdSN = CID_Tab[9] << 24;

            /* Byte 10 */
            Cid->ProdSN |= CID_Tab[10] << 16;

            /* Byte 11 */
            Cid->ProdSN |= CID_Tab[11] << 8;

            /* Byte 12 */
            Cid->ProdSN |= CID_Tab[12];

            /* Byte 13 */
            Cid->Reserved1 |= (CID_Tab[13] & 0xF0) >> 4;
            Cid->ManufactDate = (CID_Tab[13] & 0x0F) << 8;

            /* Byte 14 */
            Cid->ManufactDate |= CID_Tab[14];

            /* Byte 15 */
            Cid->CID_CRC = (CID_Tab[15] & 0xFE) >> 1;
            Cid->Reserved2 = 1;

            retr = BSP_SD_OK;
        }
    }

    /* Send dummy byte: 8 Clock pulses of delay */
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);

    /* Return the reponse */
    return retr;
}

/**
  * @brief  Sends 5 bytes command to the SD card and get response
  * @param  Cmd: The user expected command to send to SD card.
  * @param  Arg: The command argument.
  * @param  Crc: The CRC.
  * @param  Answer: SD_ANSWER_NOT_EXPECTED or SD_ANSWER_EXPECTED
  * @retval SD status
  */
SD_CmdAnswer_typedef SD_SendCmd(uint8_t Cmd, uint32_t Arg, uint8_t Crc, uint8_t Answer) {
    uint8_t frame[SD_CMD_LENGTH], frameout[SD_CMD_LENGTH];
    SD_CmdAnswer_typedef retr = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

    /* R1 Lenght = NCS(0)+ 6 Bytes command + NCR(min1 max8) + 1 Bytes answer + NEC(0) = 15bytes */
    /* R1b identical to R1 + Busy information                                                   */
    /* R2 Lenght = NCS(0)+ 6 Bytes command + NCR(min1 max8) + 2 Bytes answer + NEC(0) = 16bytes */

    /* Prepare Frame to send */
    frame[0] = (Cmd | 0x40); /* Construct byte 1 */
    frame[1] = (uint8_t)(Arg >> 24); /* Construct byte 2 */
    frame[2] = (uint8_t)(Arg >> 16); /* Construct byte 3 */
    frame[3] = (uint8_t)(Arg >> 8); /* Construct byte 4 */
    frame[4] = (uint8_t)(Arg); /* Construct byte 5 */
    frame[5] = (Crc | 0x01); /* Construct byte 6 */

    /* Send the command */
    SD_IO_CSState(0);
    SD_IO_WriteReadData(frame, frameout, SD_CMD_LENGTH); /* Send the Cmd bytes */

    switch(Answer) {
    case SD_ANSWER_R1_EXPECTED:
        retr.r1 = SD_ReadData();
        break;
    case SD_ANSWER_R1B_EXPECTED:
        retr.r1 = SD_ReadData();
        retr.r2 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        /* Set CS High */
        SD_IO_CSState(1);
        HAL_Delay(1);
        /* Set CS Low */
        SD_IO_CSState(0);

        /* Wait IO line return 0xFF */
        while(SD_IO_WriteByte(SD_DUMMY_BYTE) != 0xFF)
            ;
        break;
    case SD_ANSWER_R2_EXPECTED:
        retr.r1 = SD_ReadData();
        retr.r2 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        break;
    case SD_ANSWER_R3_EXPECTED:
    case SD_ANSWER_R7_EXPECTED:
        retr.r1 = SD_ReadData();
        retr.r2 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        retr.r3 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        retr.r4 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        retr.r5 = SD_IO_WriteByte(SD_DUMMY_BYTE);
        break;
    default:
        break;
    }
    return retr;
}

/**
  * @brief  Gets the SD card data response and check the busy flag.
  * @param  None
  * @retval The SD status: Read data response xxx0<status>1
  *         - status 010: Data accecpted
  *         - status 101: Data rejected due to a crc error
  *         - status 110: Data rejected due to a Write error.
  *         - status 111: Data rejected due to other error.
  */
uint8_t SD_GetDataResponse(void) {
    uint8_t dataresponse;
    uint8_t rvalue = SD_DATA_OTHER_ERROR;

    dataresponse = SD_IO_WriteByte(SD_DUMMY_BYTE);
    SD_IO_WriteByte(SD_DUMMY_BYTE); /* read the busy response byte*/

    /* Mask unused bits */
    switch(dataresponse & 0x1F) {
    case SD_DATA_OK:
        rvalue = SD_DATA_OK;

        /* Set CS High */
        SD_IO_CSState(1);
        /* Set CS Low */
        SD_IO_CSState(0);

        /* Wait IO line return 0xFF */
        while(SD_IO_WriteByte(SD_DUMMY_BYTE) != 0xFF)
            ;
        break;
    case SD_DATA_CRC_ERROR:
        rvalue = SD_DATA_CRC_ERROR;
        break;
    case SD_DATA_WRITE_ERROR:
        rvalue = SD_DATA_WRITE_ERROR;
        break;
    default:
        break;
    }

    /* Return response */
    return rvalue;
}

/**
  * @brief  Put the SD in Idle state.
  * @param  None
  * @retval SD status
  */
uint8_t SD_GoIdleState(void) {
    SD_CmdAnswer_typedef response;
    __IO uint8_t counter;
    /* Send CMD0 (SD_CMD_GO_IDLE_STATE) to put SD in SPI mode and 
     wait for In Idle State Response (R1 Format) equal to 0x01 */
    counter = 0;
    do {
        counter++;
        response = SD_SendCmd(SD_CMD_GO_IDLE_STATE, 0, 0x95, SD_ANSWER_R1_EXPECTED);
        SD_IO_CSState(1);
        SD_IO_WriteByte(SD_DUMMY_BYTE);
        if(counter >= SD_MAX_TRY) {
            return BSP_SD_ERROR;
        }
    } while(response.r1 != SD_R1_IN_IDLE_STATE);

    /* Send CMD8 (SD_CMD_SEND_IF_COND) to check the power supply status 
     and wait until response (R7 Format) equal to 0xAA and */
    response = SD_SendCmd(SD_CMD_SEND_IF_COND, 0x1AA, 0x87, SD_ANSWER_R7_EXPECTED);
    SD_IO_CSState(1);
    SD_IO_WriteByte(SD_DUMMY_BYTE);
    if((response.r1 & SD_R1_ILLEGAL_COMMAND) == SD_R1_ILLEGAL_COMMAND) {
        /* initialise card V1 */
        counter = 0;
        do {
            counter++;
            /* initialise card V1 */
            /* Send CMD55 (SD_CMD_APP_CMD) before any ACMD command: R1 response (0x00: no errors) */
            response = SD_SendCmd(SD_CMD_APP_CMD, 0x00000000, 0xFF, SD_ANSWER_R1_EXPECTED);
            SD_IO_CSState(1);
            SD_IO_WriteByte(SD_DUMMY_BYTE);

            /* Send ACMD41 (SD_CMD_SD_APP_OP_COND) to initialize SDHC or SDXC cards: R1 response (0x00: no errors) */
            response = SD_SendCmd(SD_CMD_SD_APP_OP_COND, 0x00000000, 0xFF, SD_ANSWER_R1_EXPECTED);
            SD_IO_CSState(1);
            SD_IO_WriteByte(SD_DUMMY_BYTE);
            if(counter >= SD_MAX_TRY) {
                return BSP_SD_ERROR;
            }
        } while(response.r1 == SD_R1_IN_IDLE_STATE);
        flag_SDHC = 0;
    } else if(response.r1 == SD_R1_IN_IDLE_STATE) {
        /* initialise card V2 */
        counter = 0;
        do {
            counter++;
            /* Send CMD55 (SD_CMD_APP_CMD) before any ACMD command: R1 response (0x00: no errors) */
            response = SD_SendCmd(SD_CMD_APP_CMD, 0, 0xFF, SD_ANSWER_R1_EXPECTED);
            SD_IO_CSState(1);
            SD_IO_WriteByte(SD_DUMMY_BYTE);

            /* Send ACMD41 (SD_CMD_SD_APP_OP_COND) to initialize SDHC or SDXC cards: R1 response (0x00: no errors) */
            response = SD_SendCmd(SD_CMD_SD_APP_OP_COND, 0x40000000, 0xFF, SD_ANSWER_R1_EXPECTED);
            SD_IO_CSState(1);
            SD_IO_WriteByte(SD_DUMMY_BYTE);
            if(counter >= SD_MAX_TRY) {
                return BSP_SD_ERROR;
            }
        } while(response.r1 == SD_R1_IN_IDLE_STATE);

        if((response.r1 & SD_R1_ILLEGAL_COMMAND) == SD_R1_ILLEGAL_COMMAND) {
            counter = 0;
            do {
                counter++;
                /* Send CMD55 (SD_CMD_APP_CMD) before any ACMD command: R1 response (0x00: no errors) */
                response = SD_SendCmd(SD_CMD_APP_CMD, 0, 0xFF, SD_ANSWER_R1_EXPECTED);
                SD_IO_CSState(1);
                SD_IO_WriteByte(SD_DUMMY_BYTE);
                if(response.r1 != SD_R1_IN_IDLE_STATE) {
                    return BSP_SD_ERROR;
                }
                /* Send ACMD41 (SD_CMD_SD_APP_OP_COND) to initialize SDHC or SDXC cards: R1 response (0x00: no errors) */
                response =
                    SD_SendCmd(SD_CMD_SD_APP_OP_COND, 0x00000000, 0xFF, SD_ANSWER_R1_EXPECTED);
                SD_IO_CSState(1);
                SD_IO_WriteByte(SD_DUMMY_BYTE);
                if(counter >= SD_MAX_TRY) {
                    return BSP_SD_ERROR;
                }
            } while(response.r1 == SD_R1_IN_IDLE_STATE);
        }

        /* Send CMD58 (SD_CMD_READ_OCR) to initialize SDHC or SDXC cards: R3 response (0x00: no errors) */
        response = SD_SendCmd(SD_CMD_READ_OCR, 0x00000000, 0xFF, SD_ANSWER_R3_EXPECTED);
        SD_IO_CSState(1);
        SD_IO_WriteByte(SD_DUMMY_BYTE);
        if(response.r1 != SD_R1_NO_ERROR) {
            return BSP_SD_ERROR;
        }
        flag_SDHC = (response.r2 & 0x40) >> 6;
    } else {
        return BSP_SD_ERROR;
    }

    return BSP_SD_OK;
}

/**
  * @brief  Waits a data until a value different from SD_DUMMY_BITE
  * @param  None
  * @retval the value read
  */
uint8_t SD_ReadData(void) {
    uint8_t timeout = 0x08;
    uint8_t readvalue;

    /* Check if response is got or a timeout is happen */
    do {
        readvalue = SD_IO_WriteByte(SD_DUMMY_BYTE);
        timeout--;

    } while((readvalue == SD_DUMMY_BYTE) && timeout);

    /* Right response got */
    return readvalue;
}

/**
  * @brief  Waits a data from the SD card
  * @param  data : Expected data from the SD card
  * @retval BSP_SD_OK or BSP_SD_TIMEOUT
  */
uint8_t SD_WaitData(uint8_t data) {
    uint16_t timeout = 0xFFFF;
    uint8_t readvalue;

    /* Check if response is got or a timeout is happen */

    do {
        readvalue = SD_IO_WriteByte(SD_DUMMY_BYTE);
        timeout--;
    } while((readvalue != data) && timeout);

    if(timeout == 0) {
        /* After time out */
        return BSP_SD_TIMEOUT;
    }

    /* Right response got */
    return BSP_SD_OK;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/