# sdcard.rs - source
Source of the Rust file `src/drivers/block/sdcard.rs`.
Keywords: rust, rustlang, rust-lang

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    #![allow(non_snake_case)]
    #![allow(non_camel_case_types)]
    #![allow(unused)]

    use super::BlockDevice;
    use crate::sync::UPIntrFreeCell;
    use core::convert::TryInto;
    use k210_hal::prelude::*;
    use k210_pac::{Peripherals, SPI0};
    use k210_soc::{
        fpioa::{self, io},
        //dmac::{dma_channel, DMAC, DMACExt},
        gpio,
        gpiohs,
        sleep::usleep,
        spi::{aitm, frame_format, tmod, work_mode, SPIExt, SPIImpl, SPI},
        sysctl,
    };
    use lazy_static::*;

    pub struct SDCard<SPI> {
        spi: SPI,
        spi_cs: u32,
        cs_gpionum: u8,
        //dmac: &'a DMAC,
        //channel: dma_channel,
    }

    /*
     * Start Data tokens:
     *         Tokens (necessary because at nop/idle (and CS active) only 0xff is
     *         on the data/command line)
     */
    /** Data token start byte, Start Single Block Read */
    pub const SD_START_DATA_SINGLE_BLOCK_READ: u8 = 0xFE;
    /** Data token start byte, Start Multiple Block Read */
    pub const SD_START_DATA_MULTIPLE_BLOCK_READ: u8 = 0xFE;
    /** Data token start byte, Start Single Block Write */
    pub const SD_START_DATA_SINGLE_BLOCK_WRITE: u8 = 0xFE;
    /** Data token start byte, Start Multiple Block Write */
    pub const SD_START_DATA_MULTIPLE_BLOCK_WRITE: u8 = 0xFC;

    pub const SEC_LEN: usize = 512;

    /** SD commands */
    #[repr(u8)]
    #[derive(Debug, PartialEq, Eq, Copy, Clone)]
    #[allow(unused)]
    pub enum CMD {
        /** Software reset */
        CMD0 = 0,
        /** Check voltage range (SDC V2) */
        CMD8 = 8,
        /** Read CSD register */
        CMD9 = 9,
        /** Read CID register */
        CMD10 = 10,
        /** Stop to read data */
        CMD12 = 12,
        /** Change R/W block size */
        CMD16 = 16,
        /** Read block */
        CMD17 = 17,
        /** Read multiple blocks */
        CMD18 = 18,
        /** Number of blocks to erase (SDC) */
        ACMD23 = 23,
        /** Write a block */
        CMD24 = 24,
        /** Write multiple blocks */
        CMD25 = 25,
        /** Initiate initialization process (SDC) */
        ACMD41 = 41,
        /** Leading command for ACMD* */
        CMD55 = 55,
        /** Read OCR */
        CMD58 = 58,
        /** Enable/disable CRC check */
        CMD59 = 59,
    }

    #[allow(unused)]
    #[derive(Debug, Copy, Clone)]
    pub enum InitError {
        CMDFailed(CMD, u8),
        CardCapacityStatusNotSet([u8; 4]),
        CannotGetCardInfo,
    }

    /**
     * Card Specific Data: CSD Register
     */
    #[derive(Debug, Copy, Clone)]
    pub struct SDCardCSD {
        pub CSDStruct: u8,        /* CSD structure */
        pub SysSpecVersion: u8,   /* System specification version */
        pub Reserved1: u8,        /* Reserved */
        pub TAAC: u8,             /* Data read access-time 1 */
        pub NSAC: u8,             /* Data read access-time 2 in CLK cycles */
        pub MaxBusClkFrec: u8,    /* Max. bus clock frequency */
        pub CardComdClasses: u16, /* Card command classes */
        pub RdBlockLen: u8,       /* Max. read data block length */
        pub PartBlockRead: u8,    /* Partial blocks for read allowed */
        pub WrBlockMisalign: u8,  /* Write block misalignment */
        pub RdBlockMisalign: u8,  /* Read block misalignment */
        pub DSRImpl: u8,          /* DSR implemented */
        pub Reserved2: u8,        /* Reserved */
        pub DeviceSize: u32,      /* Device Size */
        //MaxRdCurrentVDDMin: u8,   /* Max. read current @ VDD min */
        //MaxRdCurrentVDDMax: u8,   /* Max. read current @ VDD max */
        //MaxWrCurrentVDDMin: u8,   /* Max. write current @ VDD min */
        //MaxWrCurrentVDDMax: u8,   /* Max. write current @ VDD max */
        //DeviceSizeMul: u8,        /* Device size multiplier */
        pub EraseGrSize: u8,         /* Erase group size */
        pub EraseGrMul: u8,          /* Erase group size multiplier */
        pub WrProtectGrSize: u8,     /* Write protect group size */
        pub WrProtectGrEnable: u8,   /* Write protect group enable */
        pub ManDeflECC: u8,          /* Manufacturer default ECC */
        pub WrSpeedFact: u8,         /* Write speed factor */
        pub MaxWrBlockLen: u8,       /* Max. write data block length */
        pub WriteBlockPaPartial: u8, /* Partial blocks for write allowed */
        pub Reserved3: u8,           /* Reserded */
        pub ContentProtectAppli: u8, /* Content protection application */
        pub FileFormatGroup: u8,     /* File format group */
        pub CopyFlag: u8,            /* Copy flag (OTP) */
        pub PermWrProtect: u8,       /* Permanent write protection */
        pub TempWrProtect: u8,       /* Temporary write protection */
        pub FileFormat: u8,          /* File Format */
        pub ECC: u8,                 /* ECC code */
        pub CSD_CRC: u8,             /* CSD CRC */
        pub Reserved4: u8,           /* always 1*/
    }

    /**
     * Card Identification Data: CID Register
     */
    #[derive(Debug, Copy, Clone)]
    pub struct SDCardCID {
        pub ManufacturerID: u8, /* ManufacturerID */
        pub OEM_AppliID: u16,   /* OEM/Application ID */
        pub ProdName1: u32,     /* Product Name part1 */
        pub ProdName2: u8,      /* Product Name part2*/
        pub ProdRev: u8,        /* Product Revision */
        pub ProdSN: u32,        /* Product Serial Number */
        pub Reserved1: u8,      /* Reserved1 */
        pub ManufactDate: u16,  /* Manufacturing Date */
        pub CID_CRC: u8,        /* CID CRC */
        pub Reserved2: u8,      /* always 1 */
    }

    /**
     * Card information
     */
    #[derive(Debug, Copy, Clone)]
    pub struct SDCardInfo {
        pub SD_csd: SDCardCSD,
        pub SD_cid: SDCardCID,
        pub CardCapacity: u64,  /* Card Capacity */
        pub CardBlockSize: u64, /* Card Block Size */
    }

    impl</*'a,*/ X: SPI> SDCard</*'a,*/ X> {
        pub fn new(
            spi: X,
            spi_cs: u32,
            cs_gpionum: u8, /*, dmac: &'a DMAC, channel: dma_channel*/
        ) -> Self {
            Self {
                spi,
                spi_cs,
                cs_gpionum,
                /*
                dmac,
                channel,
                 */
            }
        }

        fn CS_HIGH(&self) {
            gpiohs::set_pin(self.cs_gpionum, true);
        }

        fn CS_LOW(&self) {
            gpiohs::set_pin(self.cs_gpionum, false);
        }

        fn HIGH_SPEED_ENABLE(&self) {
            self.spi.set_clk_rate(10000000);
        }

        fn lowlevel_init(&self) {
            gpiohs::set_direction(self.cs_gpionum, gpio::direction::OUTPUT);
            self.spi.set_clk_rate(200000);
        }

        fn write_data(&self, data: &[u8]) {
            self.spi.configure(
                work_mode::MODE0,
                frame_format::STANDARD,
                8, /* data bits */
                0, /* endian */
                0, /*instruction length*/
                0, /*address length*/
                0, /*wait cycles*/
                aitm::STANDARD,
                tmod::TRANS,
            );
            self.spi.send_data(self.spi_cs, data);
        }

        /*
        fn write_data_dma(&self, data: &[u32]) {
            self.spi.configure(
                work_mode::MODE0,
                frame_format::STANDARD,
                8, /* data bits */
                0, /* endian */
                0, /*instruction length*/
                0, /*address length*/
                0, /*wait cycles*/
                aitm::STANDARD,
                tmod::TRANS,
            );
            self.spi
                .send_data_dma(self.dmac, self.channel, self.spi_cs, data);
        }
         */

        fn read_data(&self, data: &mut [u8]) {
            self.spi.configure(
                work_mode::MODE0,
                frame_format::STANDARD,
                8, /* data bits */
                0, /* endian */
                0, /*instruction length*/
                0, /*address length*/
                0, /*wait cycles*/
                aitm::STANDARD,
                tmod::RECV,
            );
            self.spi.recv_data(self.spi_cs, data);
        }

        /*
        fn read_data_dma(&self, data: &mut [u32]) {
            self.spi.configure(
                work_mode::MODE0,
                frame_format::STANDARD,
                8, /* data bits */
                0, /* endian */
                0, /*instruction length*/
                0, /*address length*/
                0, /*wait cycles*/
                aitm::STANDARD,
                tmod::RECV,
            );
            self.spi
                .recv_data_dma(self.dmac, self.channel, self.spi_cs, data);
        }
         */

        /*
         * Send 5 bytes command to the SD card.
         * @param  cmd: The user expected command to send to SD card.
         * @param  arg: The command argument.
         * @param  crc: The CRC.
         * @retval None
         */
        fn send_cmd(&self, cmd: CMD, arg: u32, crc: u8) {
            /* SD chip select low */
            self.CS_LOW();
            /* Send the Cmd bytes */
            self.write_data(&[
                /* Construct byte 1 */
                ((cmd as u8) | 0x40),
                /* Construct byte 2 */
                (arg >> 24) as u8,
                /* Construct byte 3 */
                ((arg >> 16) & 0xff) as u8,
                /* Construct byte 4 */
                ((arg >> 8) & 0xff) as u8,
                /* Construct byte 5 */
                (arg & 0xff) as u8,
                /* Construct CRC: byte 6 */
                crc,
            ]);
        }

        /* Send end-command sequence to SD card */
        fn end_cmd(&self) {
            /* SD chip select high */
            self.CS_HIGH();
            /* Send the cmd byte */
            self.write_data(&[0xff]);
        }

        /*
         * Returns the SD response.
         * @param  None
         * @retval The SD Response:
         *         - 0xFF: Sequence failed
         *         - 0: Sequence succeed
         */
        fn get_response(&self) -> u8 {
            let result = &mut [0u8];
            let mut timeout = 0x0FFF;
            /* Check if response is got or a timeout is happen */
            while timeout != 0 {
                self.read_data(result);
                /* Right response got */
                if result[0] != 0xFF {
                    return result[0];
                }
                timeout -= 1;
            }
            /* After time out */
            0xFF
        }

        /*
         * Get SD card data response.
         * @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.
         */
        fn get_dataresponse(&self) -> u8 {
            let response = &mut [0u8];
            /* Read resonse */
            self.read_data(response);
            /* Mask unused bits */
            response[0] &= 0x1F;
            if response[0] != 0x05 {
                return 0xFF;
            }
            /* Wait null data */
            self.read_data(response);
            while response[0] == 0 {
                self.read_data(response);
            }
            /* Return response */
            0
        }

        /*
         * Read the CSD card register
         *         Reading the contents of the CSD register in SPI mode is a simple
         *         read-block transaction.
         * @param  SD_csd: pointer on an SCD register structure
         * @retval The SD Response:
         *         - `Err()`: Sequence failed
         *         - `Ok(info)`: Sequence succeed
         */
        fn get_csdregister(&self) -> Result<SDCardCSD, ()> {
            let mut csd_tab = [0u8; 18];
            /* Send CMD9 (CSD register) */
            self.send_cmd(CMD::CMD9, 0, 0);
            /* Wait for response in the R1 format (0x00 is no errors) */
            if self.get_response() != 0x00 {
                self.end_cmd();
                return Err(());
            }
            if self.get_response() != SD_START_DATA_SINGLE_BLOCK_READ {
                self.end_cmd();
                return Err(());
            }
            /* Store CSD register value on csd_tab */
            /* Get CRC bytes (not really needed by us, but required by SD) */
            self.read_data(&mut csd_tab);
            self.end_cmd();
            /* see also: https://cdn-shop.adafruit.com/datasheets/TS16GUSDHC6.pdf */
            Ok(SDCardCSD {
                /* Byte 0 */
                CSDStruct: (csd_tab[0] & 0xC0) >> 6,
                SysSpecVersion: (csd_tab[0] & 0x3C) >> 2,
                Reserved1: csd_tab[0] & 0x03,
                /* Byte 1 */
                TAAC: csd_tab[1],
                /* Byte 2 */
                NSAC: csd_tab[2],
                /* Byte 3 */
                MaxBusClkFrec: csd_tab[3],
                /* Byte 4, 5 */
                CardComdClasses: (u16::from(csd_tab[4]) << 4) | ((u16::from(csd_tab[5]) & 0xF0) >> 4),
                /* Byte 5 */
                RdBlockLen: csd_tab[5] & 0x0F,
                /* Byte 6 */
                PartBlockRead: (csd_tab[6] & 0x80) >> 7,
                WrBlockMisalign: (csd_tab[6] & 0x40) >> 6,
                RdBlockMisalign: (csd_tab[6] & 0x20) >> 5,
                DSRImpl: (csd_tab[6] & 0x10) >> 4,
                Reserved2: 0,
                // DeviceSize: (csd_tab[6] & 0x03) << 10,
                /* Byte 7, 8, 9 */
                DeviceSize: ((u32::from(csd_tab[7]) & 0x3F) << 16)
                    | (u32::from(csd_tab[8]) << 8)
                    | u32::from(csd_tab[9]),
                /* Byte 10 */
                EraseGrSize: (csd_tab[10] & 0x40) >> 6,
                /* Byte 10, 11 */
                EraseGrMul: ((csd_tab[10] & 0x3F) << 1) | ((csd_tab[11] & 0x80) >> 7),
                /* Byte 11 */
                WrProtectGrSize: (csd_tab[11] & 0x7F),
                /* Byte 12 */
                WrProtectGrEnable: (csd_tab[12] & 0x80) >> 7,
                ManDeflECC: (csd_tab[12] & 0x60) >> 5,
                WrSpeedFact: (csd_tab[12] & 0x1C) >> 2,
                /* Byte 12,13 */
                MaxWrBlockLen: ((csd_tab[12] & 0x03) << 2) | ((csd_tab[13] & 0xC0) >> 6),
                /* Byte 13 */
                WriteBlockPaPartial: (csd_tab[13] & 0x20) >> 5,
                Reserved3: 0,
                ContentProtectAppli: (csd_tab[13] & 0x01),
                /* Byte 14 */
                FileFormatGroup: (csd_tab[14] & 0x80) >> 7,
                CopyFlag: (csd_tab[14] & 0x40) >> 6,
                PermWrProtect: (csd_tab[14] & 0x20) >> 5,
                TempWrProtect: (csd_tab[14] & 0x10) >> 4,
                FileFormat: (csd_tab[14] & 0x0C) >> 2,
                ECC: (csd_tab[14] & 0x03),
                /* Byte 15 */
                CSD_CRC: (csd_tab[15] & 0xFE) >> 1,
                Reserved4: 1,
                /* Return the reponse */
            })
        }

        /*
         * Read the CID card register.
         *         Reading the contents of the CID register in SPI mode is a simple
         *         read-block transaction.
         * @param  SD_cid: pointer on an CID register structure
         * @retval The SD Response:
         *         - `Err()`: Sequence failed
         *         - `Ok(info)`: Sequence succeed
         */
        fn get_cidregister(&self) -> Result<SDCardCID, ()> {
            let mut cid_tab = [0u8; 18];
            /* Send CMD10 (CID register) */
            self.send_cmd(CMD::CMD10, 0, 0);
            /* Wait for response in the R1 format (0x00 is no errors) */
            if self.get_response() != 0x00 {
                self.end_cmd();
                return Err(());
            }
            if self.get_response() != SD_START_DATA_SINGLE_BLOCK_READ {
                self.end_cmd();
                return Err(());
            }
            /* Store CID register value on cid_tab */
            /* Get CRC bytes (not really needed by us, but required by SD) */
            self.read_data(&mut cid_tab);
            self.end_cmd();
            Ok(SDCardCID {
                /* Byte 0 */
                ManufacturerID: cid_tab[0],
                /* Byte 1, 2 */
                OEM_AppliID: (u16::from(cid_tab[1]) << 8) | u16::from(cid_tab[2]),
                /* Byte 3, 4, 5, 6 */
                ProdName1: (u32::from(cid_tab[3]) << 24)
                    | (u32::from(cid_tab[4]) << 16)
                    | (u32::from(cid_tab[5]) << 8)
                    | u32::from(cid_tab[6]),
                /* Byte 7 */
                ProdName2: cid_tab[7],
                /* Byte 8 */
                ProdRev: cid_tab[8],
                /* Byte 9, 10, 11, 12 */
                ProdSN: (u32::from(cid_tab[9]) << 24)
                    | (u32::from(cid_tab[10]) << 16)
                    | (u32::from(cid_tab[11]) << 8)
                    | u32::from(cid_tab[12]),
                /* Byte 13, 14 */
                Reserved1: (cid_tab[13] & 0xF0) >> 4,
                ManufactDate: ((u16::from(cid_tab[13]) & 0x0F) << 8) | u16::from(cid_tab[14]),
                /* Byte 15 */
                CID_CRC: (cid_tab[15] & 0xFE) >> 1,
                Reserved2: 1,
            })
        }

        /*
         * Returns information about specific card.
         * @param  cardinfo: pointer to a SD_CardInfo structure that contains all SD
         *         card information.
         * @retval The SD Response:
         *         - `Err(())`: Sequence failed
         *         - `Ok(info)`: Sequence succeed
         */
        fn get_cardinfo(&self) -> Result<SDCardInfo, ()> {
            let mut info = SDCardInfo {
                SD_csd: self.get_csdregister()?,
                SD_cid: self.get_cidregister()?,
                CardCapacity: 0,
                CardBlockSize: 0,
            };
            info.CardBlockSize = 1 << u64::from(info.SD_csd.RdBlockLen);
            info.CardCapacity = (u64::from(info.SD_csd.DeviceSize) + 1) * 1024 * info.CardBlockSize;

            Ok(info)
        }

        /*
         * Initializes the SD/SD communication in SPI mode.
         * @param  None
         * @retval The SD Response info if succeeeded, otherwise Err
         */
        pub fn init(&self) -> Result<SDCardInfo, InitError> {
            /* Initialize SD_SPI */
            self.lowlevel_init();
            /* SD chip select high */
            self.CS_HIGH();
            /* NOTE: this reset doesn't always seem to work if the SD access was broken off in the
             * middle of an operation: CMDFailed(CMD0, 127). */

            /* Send dummy byte 0xFF, 10 times with CS high */
            /* Rise CS and MOSI for 80 clocks cycles */
            /* Send dummy byte 0xFF */
            self.write_data(&[0xff; 10]);
            /*------------Put SD in SPI mode--------------*/
            /* SD initialized and set to SPI mode properly */

            /* Send software reset */
            self.send_cmd(CMD::CMD0, 0, 0x95);
            let result = self.get_response();
            self.end_cmd();
            if result != 0x01 {
                return Err(InitError::CMDFailed(CMD::CMD0, result));
            }

            /* Check voltage range */
            self.send_cmd(CMD::CMD8, 0x01AA, 0x87);
            /* 0x01 or 0x05 */
            let result = self.get_response();
            let mut frame = [0u8; 4];
            self.read_data(&mut frame);
            self.end_cmd();
            if result != 0x01 {
                return Err(InitError::CMDFailed(CMD::CMD8, result));
            }
            let mut index = 255;
            while index != 0 {
                /* <ACMD> */
                self.send_cmd(CMD::CMD55, 0, 0);
                let result = self.get_response();
                self.end_cmd();
                if result != 0x01 {
                    return Err(InitError::CMDFailed(CMD::CMD55, result));
                }
                /* Initiate SDC initialization process */
                self.send_cmd(CMD::ACMD41, 0x40000000, 0);
                let result = self.get_response();
                self.end_cmd();
                if result == 0x00 {
                    break;
                }
                index -= 1;
            }
            if index == 0 {
                return Err(InitError::CMDFailed(CMD::ACMD41, result));
            }
            index = 255;
            let mut frame = [0u8; 4];
            while index != 0 {
                /* Read OCR */
                self.send_cmd(CMD::CMD58, 0, 1);
                let result = self.get_response();
                self.read_data(&mut frame);
                self.end_cmd();
                if result == 0 {
                    break;
                }
                index -= 1;
            }
            if index == 0 {
                return Err(InitError::CMDFailed(CMD::CMD58, result));
            }
            if (frame[0] & 0x40) == 0 {
                return Err(InitError::CardCapacityStatusNotSet(frame));
            }
            self.HIGH_SPEED_ENABLE();
            self.get_cardinfo()
                .map_err(|_| InitError::CannotGetCardInfo)
        }

        /*
         * Reads a block of data from the SD.
         * @param  data_buf: slice that receives the data read from the SD.
         * @param  sector: SD's internal address to read from.
         * @retval The SD Response:
         *         - `Err(())`: Sequence failed
         *         - `Ok(())`: Sequence succeed
         */
        pub fn read_sector(&self, data_buf: &mut [u8], sector: u32) -> Result<(), ()> {
            assert!(data_buf.len() >= SEC_LEN && (data_buf.len() % SEC_LEN) == 0);
            /* Send CMD17 to read one block, or CMD18 for multiple */
            let flag = if data_buf.len() == SEC_LEN {
                self.send_cmd(CMD::CMD17, sector, 0);
                false
            } else {
                self.send_cmd(CMD::CMD18, sector, 0);
                true
            };
            /* Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
            if self.get_response() != 0x00 {
                self.end_cmd();
                return Err(());
            }
            let mut error = false;
            //let mut dma_chunk = [0u32; SEC_LEN];
            let mut tmp_chunk = [0u8; SEC_LEN];
            for chunk in data_buf.chunks_mut(SEC_LEN) {
                if self.get_response() != SD_START_DATA_SINGLE_BLOCK_READ {
                    error = true;
                    break;
                }
                /* Read the SD block data : read NumByteToRead data */
                //self.read_data_dma(&mut dma_chunk);
                self.read_data(&mut tmp_chunk);
                /* Place the data received as u32 units from DMA into the u8 target buffer */
                for (a, b) in chunk.iter_mut().zip(/*dma_chunk*/ tmp_chunk.iter()) {
                    //*a = (b & 0xff) as u8;
                    *a = *b;
                }
                /* Get CRC bytes (not really needed by us, but required by SD) */
                let mut frame = [0u8; 2];
                self.read_data(&mut frame);
            }
            self.end_cmd();
            if flag {
                self.send_cmd(CMD::CMD12, 0, 0);
                self.get_response();
                self.end_cmd();
                self.end_cmd();
            }
            /* It is an error if not everything requested was read */
            if error {
                Err(())
            } else {
                Ok(())
            }
        }

        /*
         * Writes a block to the SD
         * @param  data_buf: slice containing the data to be written to the SD.
         * @param  sector: address to write on.
         * @retval The SD Response:
         *         - `Err(())`: Sequence failed
         *         - `Ok(())`: Sequence succeed
         */
        pub fn write_sector(&self, data_buf: &[u8], sector: u32) -> Result<(), ()> {
            assert!(data_buf.len() >= SEC_LEN && (data_buf.len() % SEC_LEN) == 0);
            let mut frame = [0xff, 0x00];
            if data_buf.len() == SEC_LEN {
                frame[1] = SD_START_DATA_SINGLE_BLOCK_WRITE;
                self.send_cmd(CMD::CMD24, sector, 0);
            } else {
                frame[1] = SD_START_DATA_MULTIPLE_BLOCK_WRITE;
                self.send_cmd(
                    CMD::ACMD23,
                    (data_buf.len() / SEC_LEN).try_into().unwrap(),
                    0,
                );
                self.get_response();
                self.end_cmd();
                self.send_cmd(CMD::CMD25, sector, 0);
            }
            /* Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
            if self.get_response() != 0x00 {
                self.end_cmd();
                return Err(());
            }
            //let mut dma_chunk = [0u32; SEC_LEN];
            let mut tmp_chunk = [0u8; SEC_LEN];
            for chunk in data_buf.chunks(SEC_LEN) {
                /* Send the data token to signify the start of the data */
                self.write_data(&frame);
                /* Write the block data to SD : write count data by block */
                for (a, &b) in /*dma_chunk*/ tmp_chunk.iter_mut().zip(chunk.iter()) {
                    //*a = b.into();
                    *a = b;
                }
                //self.write_data_dma(&mut dma_chunk);
                self.write_data(&tmp_chunk);
                /* Put dummy CRC bytes */
                self.write_data(&[0xff, 0xff]);
                /* Read data response */
                if self.get_dataresponse() != 0x00 {
                    self.end_cmd();
                    return Err(());
                }
            }
            self.end_cmd();
            self.end_cmd();
            Ok(())
        }
    }

    /** GPIOHS GPIO number to use for controlling the SD card CS pin */
    const SD_CS_GPIONUM: u8 = 7;
    /** CS value passed to SPI controller, this is a dummy value as SPI0_CS3 is not mapping to anything
     * in the FPIOA */
    const SD_CS: u32 = 3;

    /** Connect pins to internal functions */
    fn io_init() {
        fpioa::set_function(io::SPI0_SCLK, fpioa::function::SPI0_SCLK);
        fpioa::set_function(io::SPI0_MOSI, fpioa::function::SPI0_D0);
        fpioa::set_function(io::SPI0_MISO, fpioa::function::SPI0_D1);
        fpioa::set_function(io::SPI0_CS0, fpioa::function::gpiohs(SD_CS_GPIONUM));
        fpioa::set_io_pull(io::SPI0_CS0, fpioa::pull::DOWN); // GPIO output=pull down
    }

    lazy_static! {
        static ref PERIPHERALS: UPIntrFreeCell<Peripherals> =
            unsafe { UPIntrFreeCell::new(Peripherals::take().unwrap()) };
    }

    fn init_sdcard() -> SDCard<SPIImpl<SPI0>> {
        // wait previous output
        usleep(100000);
        let peripherals = unsafe { Peripherals::steal() };
        sysctl::pll_set_freq(sysctl::pll::PLL0, 800_000_000).unwrap();
        sysctl::pll_set_freq(sysctl::pll::PLL1, 300_000_000).unwrap();
        sysctl::pll_set_freq(sysctl::pll::PLL2, 45_158_400).unwrap();
        let clocks = k210_hal::clock::Clocks::new();
        peripherals.UARTHS.configure(115_200.bps(), &clocks);
        io_init();

        let spi = peripherals.SPI0.constrain();
        let sd = SDCard::new(spi, SD_CS, SD_CS_GPIONUM);
        let info = sd.init().unwrap();
        let num_sectors = info.CardCapacity / 512;
        assert!(num_sectors > 0);

        println!("init sdcard!");
        sd
    }

    pub struct SDCardWrapper(UPIntrFreeCell<SDCard<SPIImpl<SPI0>>>);

    impl SDCardWrapper {
        pub fn new() -> Self {
            unsafe { Self(UPIntrFreeCell::new(init_sdcard())) }
        }
    }

    impl BlockDevice for SDCardWrapper {
        fn read_block(&self, block_id: usize, buf: &mut [u8]) {
            self.0
                .exclusive_access()
                .read_sector(buf, block_id as u32)
                .unwrap();
        }
        fn write_block(&self, block_id: usize, buf: &[u8]) {
            self.0
                .exclusive_access()
                .write_sector(buf, block_id as u32)
                .unwrap();
        }
        fn handle_irq(&self) {
            unimplemented!();
        }
    }