tbx/include/drv/sd_spi.h

/*!
 * \file drv/sd_spi.h
 * \brief
 *      SD card driver using SPI interface
 *
 * \copyright Copyright (C) 2021 Christos Choutouridis <christos@choutouridis.net>
 *
 * <dl class=\"section copyright\"><dt>License</dt><dd>
 * The MIT License (MIT)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * </dd></dl>
 */

#ifndef TBX_DRV_SD_SPI_H_
#define TBX_DRV_SD_SPI_H_

#include <core/core.h>
#include <core/crtp.h>

//#include <drv/diskio.h>

#include <ctime>
#include <utility>

namespace tbx {

/*!
 *
 * http://elm-chan.org/docs/mmc/mmc_e.html
 *
 * CRTP requirements
 *  bool WP_impl ();                // write protect,      true => write protect
 *  bool CD_impl ();                // check disk present, true => present
 *  void CS_impl (bool select);     // Chip select,        true => select
 *  void PWR_impl(bool state);      // SD power,           true => power the card
 *  data_type SPI_rw_impl (data_type);      // SPI read-write functionality
 *  bool SPI_set_clk_impl(uint32_t clk);    // SPI set clock functionality
 *  clock_t clock_impl();           // get system's CPU time
 */
template <typename Impl_t>
class sd_card {
    _CRTP_IMPL(Impl_t);

    using data_type = uint8_t;

    // Driver settings
    constexpr static clock_t SD_WaitTimeout = 500;      // 500 [CPU time]
    constexpr static clock_t SD_PowerTimeout= 250;      // 250 [CPU time]
    constexpr static clock_t SD_RxTimeout   = 100;      // 100 [CPU time]
    constexpr static clock_t SD_InitTimeout = 2000;     // 2000 [CPU time]
    constexpr static uint32_t MaxInitClock  = 400000;   // 400000 [Hz]

    // MMC/SDC definitions
    constexpr static data_type CMD_MSB      = 0x40;
    constexpr static data_type CMD_CRC_LSB  = 0x01;

    constexpr static data_type CMD0         = (CMD_MSB | 0);    //!< GO_IDLE_STATE
    constexpr static data_type CMD1         = (CMD_MSB | 1);    //!< SEND_OP_COND (MMC)
    constexpr static data_type CMD8         = (CMD_MSB | 8);    //!< SEND_IF_COND
    constexpr static data_type CMD9         = (CMD_MSB | 9);    //!< SEND_CSD
    constexpr static data_type CMD10        = (CMD_MSB | 10);   //!< SEND_CID
    constexpr static data_type CMD12        = (CMD_MSB | 12);   //!< STOP_TRANSMISSION
    constexpr static data_type CMD16        = (CMD_MSB | 16);   //!< SET_BLOCKLEN
    constexpr static data_type CMD17        = (CMD_MSB | 17);   //!< READ_SINGLE_BLOCK
    constexpr static data_type CMD18        = (CMD_MSB | 18);   //!< READ_MULTIPLE_BLOCK
    constexpr static data_type CMD23        = (CMD_MSB | 23);   //!< SET_BLOCK_COUNT (MMC)
    constexpr static data_type CMD24        = (CMD_MSB | 24);   //!< WRITE_BLOCK
    constexpr static data_type CMD25        = (CMD_MSB | 25);   //!< WRITE_MULTIPLE_BLOCK
    constexpr static data_type CMD55        = (CMD_MSB | 55);   //!< APP_CMD
    constexpr static data_type CMD58        = (CMD_MSB | 58);   //!< READ_OCR

    constexpr static data_type ACMD13       = (0xC0 + 13);      //!< SD_STATUS (SDC)
    constexpr static data_type ACMD23       = (0xC0 + 23);      //!< SET_WR_BLK_ERASE_COUNT (SDC)
    constexpr static data_type ACMD41       = (0xC0 + 41);      //!< SEND_OP_COND (SDC)

    constexpr static data_type R1_READY_STATE      = 0x00;      //!< status for card in the ready state
    constexpr static data_type R1_IDLE_STATE       = 0x01;      //!< status for card in the idle state
    constexpr static data_type R1_ILLEGAL_COMMAND  = 0x04;      //!< status bit for illegal command
    constexpr static data_type DATA_START_BLOCK    = 0xFE;      //!< start data token for read or write single block
    constexpr static data_type STOP_TRAN_TOKEN     = 0xFD;      //!< stop token for write multiple blocks
    constexpr static data_type WRITE_MULTIPLE_TOKEN= 0xFC;      //!< start data token for write multiple blocks
    constexpr static data_type DATA_RES_MASK       = 0x1F;      //!< mask for data response tokens after a write block operation
    constexpr static data_type DATA_RES_ACCEPTED   = 0x05;      //!< write data accepted token

    // MMC card type flags (MMC_GET_TYPE)
    //! \note
    //! These types are compatible with FatFS types
    constexpr static data_type CT_NONE      = 0x00;
    constexpr static data_type CT_MMC       = 0x01;             //!< MMC ver 3
    constexpr static data_type CT_SD1       = 0x02;             //!< SD ver 1
    constexpr static data_type CT_SD2       = 0x04;             //!< SD ver 2
    constexpr static data_type CT_SDC       = (CT_SD1|CT_SD2);  //!< SD
    constexpr static data_type CT_BLOCK     = 0x08;             //!< Block addressing

public:

    enum status_t : uint8_t {
        ST_OK         =0,
        ST_NOINIT    = 1,
        ST_NODISK    = 2,
        ST_WRPROTECT = 3,
        ST_ERROR     = 4
    };

    enum ioctl_cmd {
        // Fatfs compatibility
        IOCTL_SYNC              =0,     //!< Flush disk cache (for write functions)
        IOCTL_GET_SECTOR_COUNT  =1,     //!< Get media size (for only f_mkfs())
        IOCTL_GET_SECTOR_SIZE   =2,     //!< Get sector size (for multiple sector size (_MAX_SS >= 1024))
        IOCTL_GET_BLOCK_SIZE    =3,     //!< Get erase block size (for only f_mkfs())
        IOCTL_ERASE_SECTOR      =4,     //!< Force erased a block of sectors (for only _USE_ERASE)

        // Generics
        IOCTL_POWER             =5,     //!< Get/Set power status
        IOCTL_LOCK              =6,     //!< Lock/Unlock media removal
        IOCTL_EJECT             =7,     //!< Eject media
        IOCTL_FORMAT            =8,     //!< Create physical format on the media

        // SD/MMC specific
        IOCTL_MMC_GET_TYPE      =10,    //!< Get card type
        IOCTL_MMC_GET_CSD       =11,    //!< Get CSD
        IOCTL_MMC_GET_CID       =12,    //!< Get CID
        IOCTL_MMC_GET_OCR       =13,    //!< Get OCR
        IOCTL_MMC_GET_SDSTAT    =14,    //!< Get SD status
    };

public:
    sd_card() :
        status{ST_NOINIT} { }

    sd_card(const sd_card&)             = delete;
    sd_card& operator=(const sd_card&)  = delete;

private:

    /*!
     * \brief
     *    Calculate the maximum data transfer rate per one data line
     *    from the CSD.
     *    TRAN_SPEED is the CSD[103..96]
     *
     *    TRAN_SPEED bit code
     * ---------------------------------------------------
     *    2:0     | transfer rate unit
     *            | 0=100kbit/s, 1=1Mbit/s, 2=10Mbit/s,
     *            | 3=100Mbit/s, 4... 7=reserved
     *  ---------------------------------------------------
     *    6:3     | time value
     *  --------------------------------------------------
     *    7       | Reserved
     *
     * \param      csd  Pointer to CSD array 128bit.
     * \return     The maximum spi baud rate.
     */
    uint32_t csd2bautrate (data_type *csd) {
        data_type  brmul = 0;
        uint32_t br = 100000;     // 100Kbit

        // Mask [2..0] bits of TRAN_SPEED
        brmul = csd[3] & 0x07;
        while (brmul--)
            br *= 10;
        return br;
    }

    void delay (clock_t t) {
        clock_t mark = impl().clock_impl();
        while (impl().clock_impl() - mark < t)
            ;
    }

    /*!
     * \brief Check if SD Card is present.
     * \return        The sd card present status
     *    \arg  false   Is NOT present
     *    \arg  true    Is present.
     */
    bool is_present () {
        return impl().CD_impl();
    }

    /*!
     * \brief Check if SD Card is write protected.
     * \return        The write protect status
     *    \arg  false   Is NOT write protected
     *    \arg  true    Is write protected.
     */
    bool is_write_protected () {
        return impl().WP_impl();
    }

    /*!
     * \brief Powers up or down the SD Card.
     * \param   on    On/Off flag.
     * \return        The new power state state
     */
    bool power (bool on) {
        impl().PWR_impl(on);
        return pwr_flag = on;
    }

    /*!
     * \brief Check if SD Card is powered.
     * \return        The power status
     *    \arg  false The drive is not powered
     *    \arg  true  The drive is powered
     */
    bool power () { return pwr_flag; }

    /*!
     * \brief Chip-select control
     * \param   state   True to Select, false to de-select.
     */
    void select() {
        spi_tx(0xFF);
        impl().CS_impl(false);
        spi_tx(0xFF);
    }

    /*!
     * \brief De-select SD Card and release SPI bus
     * \return        None.
     */
    void release () {
        spi_tx(0xFF);
        impl().CS_impl(true);
        spi_tx(0xFF);
    }

    /*!
     * \brief Transmit a byte to SD/MMC via SPI
     * \param   data  The data to send to the SPI bus.
     */
    void spi_tx (data_type data) {
        impl().SPI_rw_impl (data);
    }

    /*!
     * \brief Receive a byte to SD/MMC via SPI.
     * \return        The data received from SPI bus.
     */
    data_type spi_rx () {
        return impl().SPI_rw_impl (0xFF);
    }

    /*!
     * \brief Keep calling spi_rx until response \c resp.
     *
     * \param  resp     the response we wait for
     * \param  timeout  timeout for the operation
     * \return
     *    \arg  true  Ready
     *    \arg  false NOT ready.
     */
    bool spi_wait_for (data_type resp, clock_t timeout) {
        data_type res;
        clock_t mark = impl().clock_impl();

        do
           res = spi_rx ();
        while ((res != resp) && ((impl().clock_impl() - mark) < timeout));

        return (res == resp);
    }

    bool activate (bool state) {
        if (state) {
            power(true);                    // power on with delay
            delay (SD_PowerTimeout);
            impl().CS_impl(1);              // make sure CS is high
            for (size_t i=0 ; i<10 ; ++i)   // 80 dummy clocks with DI high
                spi_tx(0xFF);
            status = ST_NOINIT;             // mark the status
        }
        else {
            power(false);                   // power off
            impl().CS_impl(0);              // keep CS pin voltage low
            status = ST_NOINIT;             // mark the status
        }
        return state;
    }

    /*!
     * \brief
     *    Receive a data packet from MMC/SD
     *
     * \param   buffer  Pointer to data buffer to store received data
     * \param   n       Byte count (must be multiple of 4)
     * \return          The operation status
     *    \arg  false   Fail
     *    \arg  true    Success.
     */
    bool rx_datablock (data_type* buffer, size_t n) {

        if (! spi_wait_for(DATA_START_BLOCK, SD_RxTimeout))
            return false;

        /*!
         * Receive the data block into buffer and make sure
         * we receive multiples of 4
         */
        n += (n%4) ? 4-(n%4):0;
        for ( ; n>0 ; --n)
           *buffer++ = spi_rx ();

        spi_rx ();  // Discard CRC
        spi_rx ();
        return true;
    }

    /*!
     * \brief
     *    Transmit a data block (512bytes) to MMC/SD
     *
     * \param   buffer  Pointer to 512 byte data block to be transmitted
     * \param   token   Data/Stop token
     * \return          The operation status
     *    \arg  false   Fail
     *    \arg  true    Success.
     */
    bool tx_datablock (const data_type* buffer, data_type token) {
        if (!spi_wait_for(0xFF, SD_WaitTimeout))
            return false;

        spi_tx(token);              // transmit data token
        if (token != STOP_TRAN_TOKEN) {
            // if its data token, transmit the 512 byte block
            size_t cnt = 512;
            do
                spi_tx(*buffer++);
            while (--cnt);
            spi_tx(0xFF);           // CRC (Dummy)
            spi_tx(0xFF);
            data_type r = spi_rx(); // Receive data response
            if ((r & DATA_RES_MASK) != DATA_RES_ACCEPTED) // If not accepted, return with error
                return false;
        }
        return true;
    }

    /*!
     * \brief
     *    Send a command packet to SD/MMC and return the response
     *
     * \param   cmd     Command byte
     * \param   arg     Argument
     * \return          The response as operation status
     */
    data_type command (data_type cmd, uint32_t arg) {
        data_type n, r;

        if (cmd & 0x80) {
           /*!
            * SD_ACMD<n> is the command sequence of CMD55-SD_CMD<n>
            */
           cmd &= 0x7F;
           r = command (CMD55, 0);
           if (r > 1)
               return r;
        }

        // Send command packet
        spi_tx (cmd);                   // Start + Command index
        spi_tx ((data_type)(arg>>24));  // Argument [31..24]
        spi_tx ((data_type)(arg>>16));  // Argument [23..16]
        spi_tx ((data_type)(arg>>8));   // Argument [15..8]
        spi_tx ((data_type)arg);        // Argument [7..0]

        if (cmd == CMD0)      n = 0x94; // Valid CRC for CMD0(0)
        else if (cmd == CMD8) n = 0x86; // Valid CRC for CMD8(0x1AA)
        else                   n = 0x00;
        spi_tx (n | CMD_CRC_LSB);

        // Receive command response
        if (cmd == CMD12)
           spi_rx ();    // Skip a stuff byte when stop reading

        // Wait for a valid response in timeout of 0xFF attempts
        size_t nn = 0xFF;
        do
           r = spi_rx ();
        while ((r & 0x80) && --nn);

        return r;       // Return with the response value
    }

    bool do_command_until (data_type done, data_type cmd, uint32_t arg, clock_t timeout) {
        clock_t mark = impl().clock_impl();
        data_type ret;
        do
            ret = command (cmd, arg);
        while (ret != done && impl().clock_impl() - mark < timeout);
        return ret == done;
    }

public:
    bool get_CSD (data_type* csd) {
        bool ret = false;
        select();                                                           // select card's CS
        if (command (CMD9, 0) == R1_READY_STATE && rx_datablock (csd, 16))  // READ_CSD
            ret = true;
        release();                                                          // release card's CS
        return ret;
    }

    bool get_CID (data_type* cid) {
        bool ret = false;
        select();                                                           // select card's CS
        if (command (CMD10, 0) == R1_READY_STATE && rx_datablock (cid, 16)) // READ_CID
            ret = true;
        release();                                                          // release card's CS
        return ret;
    }

    bool get_OCR (data_type* ocr) {
        bool ret = false;
        select();                                                           // select card's CS
        // Receive OCR as an R3 response (4 bytes)
        if (command (CMD58, 0) == 0) {   // READ_OCR
            for (size_t n = 0; n < 4; ++n)
                *ocr++ = spi_rx ();
            ret = true;
        }
        release();                                                          // release card's CS
        return ret;
    }

//    bool get_SDSTAT (data_type* sdstat) {
//        bool ret = false;
//        select();                                                           // select card's CS
//        if (command (ACMD13, 0) == 0) {  // SD_STATUS
//           spi_rx ();
//           if (rx_datablock (sdstat, 64))
//              ret = true;
//        }
//        release();                                                          // release card's CS
//        return ret;
//    }

    bool sync () {
        select();                                       // select card's CS
        bool st = spi_wait_for(0xFF, SD_WaitTimeout);   // flush
        release();                                      // release card's CS
        return st;
    }

    size_t sector_count() {
        size_t ret =0;
        data_type csd[16];

        select();                                       // select card's CS
        if (get_CSD(csd)) {
            if ((csd[0] >> 6) == 1) {
                // SDC version 2.00
                size_t csize = csd[9] + ((uint16_t)csd[8] << 8) + 1;
                ret = csize << 10;
            }
            else {
                // SDC version 1.XX or MMC
                uint8_t n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
                size_t csize = (csd[8] >> 6) + ((uint16_t)csd[7] << 2) + ((uint16_t)(csd[6] & 3) << 10) + 1;
                ret = csize << (n - 9);
            }
        }
        release();                                      // release card's CS
        return ret;
    }

    size_t sector_size() const { return 512; }

    size_t block_size() {
        size_t ret =0;
        data_type csd[16];

        select();                                       // select card's CS
        if (card_type & CT_SD2) {
            // SDC version 2.00
            if (command (ACMD13, 0) == R1_READY_STATE) {
                spi_rx ();                              // Read SD status
                if (rx_datablock (csd, 16)) {           // Read partial block
                    for (size_t n = 64 - 16; n; n--)    // Purge trailing data
                        spi_rx ();
                    ret = 16UL << (csd[10] >> 4);
                }
            }
        }
        else {
            // SDC version 1.XX or MMC
            if (get_CSD(csd)) {                         // Read CSD
                if (card_type & CT_SD1)                 // SDC version 1.XX
                    ret = (((csd[10] & 63) << 1) + ((uint16_t)(csd[11] & 128) >> 7) + 1) << ((csd[13] >> 6) - 1);
                else                                    // MMC
                    ret = ((uint16_t)((csd[10] & 124) >> 2) + 1) * (((csd[11] & 3) << 3) + ((csd[11] & 224) >> 5) + 1);
            }
        }
        release();                                      // release card's CS
        return ret;
    }

    /*!
     * \brief
     *    De-Initialize SD Drive.
     * \return  None
     */
    void deinit () {
        card_type   = data_type{};
        status      = status_t{};
        activate (0);   // finally power off the card
    }

    /*!
     * \brief
     *    Initialize SD Drive.
     *
     * \return  The status of the operation
     *    \arg  false   On error.
     *    \arg  true    On success.
     */
    bool init () {
        uint32_t clk;
        data_type ocr[4], csd[16];

        clk = 400000;                       // Start at lower clk
        impl().SPI_set_clk_impl(clk);

        activate (0);                       // Initially power off the card
        if (!is_present()) {                // check for presence
            status = ST_NODISK;
            return false;
        }
        activate (1);                       // activate and wait for PowerTimeout delay

        select();                           // select card
        data_type type = CT_NONE;

        if (command (CMD0, 0) == R1_IDLE_STATE) {   // Command to enter Idle state
            if (command (CMD8, 0x1AA) == 1) {       // check SD version
                // SDHC
                for (size_t n=0 ; n<4 ; ++n)                // Get trailing return value of R7 response
                    ocr[n] = spi_rx ();
                if (ocr[2] == 0x01 && ocr[3] == 0xAA) {
                    // Wait for leaving idle state (ACMD41 with HCS bit)
                    bool st = do_command_until(R1_READY_STATE, ACMD41, 1UL << 30, SD_InitTimeout);

                    if (st && get_OCR(ocr))
                        type = (ocr[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2;
                }
            } else {
                data_type cmd;
                // SDSC or MMC
                if (command (ACMD41, 0) <= 1) {  // SDSC
                    type = CT_SD1; cmd = ACMD41;
                } else { // MMC
                    type = CT_MMC; cmd = CMD1;
                }
                // Wait for leaving idle state (ACMD41 || CMD1)
                bool st = do_command_until(R1_READY_STATE, cmd, 0, SD_InitTimeout);
                // On failure, set R/W block length to 512 (For FAT compatibility)
                if (!st || command (CMD16, 512) != R1_READY_STATE)
                    type = CT_NONE;
            }
        }
        card_type = type;
        release ();    // Initialization ended

        if (type != CT_NONE) {
            // Success
            get_CSD(csd);
            clk = csd2bautrate(csd);
            impl().SPI_set_clk_impl(clk);
            status = ST_OK;
            return true;
        }
        else {
            activate(0);
            return false;
        }
    }

    status_t get_status () const { return status; }

    /*!
     * \brief
     *    Read Sector(s)
     *
     * \param   sector Start sector number (LBA)
     * \param   buf    Pointer to the data buffer to store read data
     * \param   count  Sector (512 bytes) count (1..255)
     * \return  The status of the operation
     *    \arg  false       On error.
     *    \arg  true        On success.
     */
    bool read (size_t sector, data_type *buf, size_t count) {

        if (status != ST_OK)    return false;

        if (!(card_type & CT_BLOCK))                        // Convert to byte address if needed
            sector *= 512;
        select();
        if (count == 1) {                                   //Single block read
            if (command (CMD17, sector) == 0)
                if (rx_datablock (buf, 512))
                    count = 0;
        }
        else {                                              // Multiple block read
            if (command (CMD18, sector) == 0) {
                do {
                    if (!rx_datablock (buf, 512))
                        break;
                    buf += 512;
                } while (--count);
                command (CMD12, 0);                 // STOP_TRANSMISSION
            }
        }
       release ();
       return (count == 0);
    }

    /*!
     * \brief
     *    Write Sector(s)
     *
     * \param   sector Start sector number (LBA)
     * \param   buf    Pointer to the data to be written
     * \param   count  Sector(512 bytes) count (1..255)
     * \return  The status of the operation
     *    \arg  false       On error.
     *    \arg  true        On success.
     */
    bool write (size_t sector, const data_type *buf, size_t count) {

       if (!count)              return false;
       if (status != ST_OK)     return false;

       if (!(card_type & CT_BLOCK))                         // Convert to byte address if needed
           sector *= 512;

       select();
       if (count == 1) {                                    // Single block write
           if ((command (CMD24, sector) == 0) && tx_datablock (buf, 0xFE))
               count = 0;
       } else {                                             // Multiple block write
           if (card_type & CT_SDC)
               command (ACMD23, count);
           if (command (CMD25, sector) == 0) {
               do {
                   if (!tx_datablock (buf, WRITE_MULTIPLE_TOKEN))
                       break;
                   buf += 512;
               } while (--count);
               if (!tx_datablock (0, STOP_TRAN_TOKEN))      // STOP token
                   count = 1;
           }
       }
       release ();
       return (count == 0);
    }

    bool ioctl (ioctl_cmd cmd, void* buffer) {
        switch (cmd) {
            // SD/MMC specific
            case IOCTL_MMC_GET_TYPE:    *(data_type*)buffer = card_type;    return true;
            case IOCTL_MMC_GET_CSD:     return get_CSD ((data_type*)buffer);
            case IOCTL_MMC_GET_CID:     return get_CID ((data_type*)buffer);
            case IOCTL_MMC_GET_OCR:     return get_OCR ((data_type*)buffer);
            case IOCTL_MMC_GET_SDSTAT:  return false;

            // Generic
            case IOCTL_POWER:
                switch (*(data_type*)buffer) {
                    case 0: *((data_type*)buffer+1) = (data_type)activate(0); return true;
                    case 1: *((data_type*)buffer+1) = (data_type)activate(0); return true;
                    case 2: *((data_type*)buffer+1) = (data_type)power();     return true;
                    default: return false;
                }
                break;
            case IOCTL_LOCK:
            case IOCTL_EJECT:
            case IOCTL_FORMAT:
                return false;

            // FatFS compatibility
            case IOCTL_SYNC:            return sync();
            case IOCTL_GET_SECTOR_COUNT:return (*(size_t*) buffer = sector_count() != 0);
            case IOCTL_GET_SECTOR_SIZE: return (*(size_t*) buffer = sector_size() != 0);
            case IOCTL_GET_BLOCK_SIZE:  return (*(size_t*) buffer = block_size() != 0);
            case IOCTL_ERASE_SECTOR:    return false;

            default:
                return false;
        }
    }

private:
    data_type   card_type{};
    status_t    status{};
    bool        pwr_flag{};

};

} // namespace tbx

#endif /* TBX_DRV_SD_SPI_H_ */