关于STM8S使用硬件SPI收发问题

浅浅的花香味﹌ 2022-08-11 08:58 379阅读 0赞

在调试STM8S的SPI时候,由于在学习板上飞线,然后发现每次读SPI FLASH的设备ID等都是不对的.

在21IC发帖求救[http://bbs.21ic.com/forum.php?mod=viewthread&tid=788880&epclose=1][http_bbs.21ic.com_forum.php_mod_viewthread_tid_788880_epclose_1]

总体来说是怀疑硬件飞线的干扰.于是今天又飞了一块板子,发现仍然有这样的问题.

好吧,真的只能打板了.

自己想想会不会在读取数据前SPI的硬件BUFFER中就存在有数据啊.

嗯,有可能, 于是在读数据前,先将SPI的数据先读出,清空缓存,具体代码如下

/*
     --Common functions
     */
    
    /*
     * Function:       Wait_Flash_WarmUp
     * Arguments:      None.
     * Description:    Wait some time until flash read / write enable.
     * Return Message: None.
     */
    void Wait_Flash_WarmUp()
    {
        uint32 time_cnt = FlashFullAccessTime;
        while( time_cnt > 0 )
        {
            time_cnt--;
        }
    }
    
    /*
     * Function:       Initial_Spi
     * Arguments:      None
     * Description:    Initial spi flash state and wait flash warm-up
     *                 (enable read/write).
     * Return Message: None
     */
    void Initial_Spi()
    {
    
    #ifdef GPIO_SPI
        WPn = 1;        // Write potected initial high
        SI = 0;         // Flash input data
        SCLK = 1;       // Flash input clock
        CSn = 1;        // Chip Select
    #endif
    	GPIO_Init(CS_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_SCK_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_MOSI_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_MISO_PIN,GPIO_MODE_IN_PU_NO_IT);
    
    	SPI_DeInit();
    	SPI_Init(SPI_FIRSTBIT_MSB,SPI_BAUDRATEPRESCALER_2,SPI_MODE_MASTER,SPI_CLOCKPOLARITY_HIGH,\
    		SPI_CLOCKPHASE_2EDGE,SPI_DATADIRECTION_2LINES_FULLDUPLEX,SPI_NSS_SOFT,0x07);
    	SPI_Cmd(TRUE);
    
    	// Wait flash warm-up
        Wait_Flash_WarmUp();
    }
    
    /*
     * Function:       CS_Low, CS_High
     * Arguments:      None.
     * Description:    Chip select go low / high.
     * Return Message: None.
     */
    void CS_Low()
    {
    #ifdef GPIO_SPI
        CSn = 0;
    #else
        //--- insert your chip select code here. ---//
        GPIO_WriteLow(CS_PIN);
    #endif
    }
    
    void CS_High()
    {
    #ifdef GPIO_SPI
        CSn = 1;
        WPn = 1;
    #else
        //--- insert your chip select code here. ---//
        GPIO_WriteHigh(CS_PIN);
    #endif
    }
    
    /*
     * Function:       InsertDummyCycle
     * Arguments:      dummy_cycle, number of dummy clock cycle
     * Description:    Insert dummy cycle of SCLK
     * Return Message: None.
     */
    void InsertDummyCycle( uint8 dummy_cycle )
    {
    #ifdef GPIO_SPI
        uint8 i;
        for( i=0; i < dummy_cycle; i=i+1 )
        {
            SCLK = 0;
            SCLK = 1;
        }
    #else
        //--- insert your code here. ---//
        uint8 i;
        for( i=0; i < dummy_cycle / 8 ; i=i+1 )
        {
    		SPI_SendData(DUMMY_BYTE);
        }
    #endif
    }
    
    /*
     * Function:       SendByte
     * Arguments:      byte_value, data transfer to flash
     *                 transfer_type, select different type of I/O mode.
     *                 Seven mode:
     *                 SIO, single IO
     *                 DIO, dual IO
     *                 QIO, quad IO
     *                 PIO, parallel
     *                 DTSIO, double transfer rate SIO
     *                 DTDIO, double transfer rate DIO
     *                 DTQIO, double transfer rate QIO
     * Description:    Send one byte data to flash
     * Return Message: None.
     */
    void SendByte( uint8 byte_value, uint8 transfer_type )
    {
    	while(SPI_GetFlagStatus(SPI_FLAG_TXE) == RESET);
    
    	SPI_SendData(byte_value);
    
    #ifdef GPIO_SPI
        uint16 i;
        uint8 cycle_cnt;
    
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // single I/O
            cycle_cnt = 8;
            for( i= 0; i < cycle_cnt; i++ )
            {
                if ( (byte_value & IO_MASK) == 0x80 ){
                    SI = 1;
                }
                else{
                    SI = 0;
                }
                SCLK = 0;
                byte_value = byte_value << 1;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef DIO
        case DIO: // dual I/O
            cycle_cnt = 4;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef QIO
        case QIO: // quad I/O
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                P1 = (byte_value & 0xf0);  // CS# and SCLK must be zero at this phase
                byte_value = byte_value << 4;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef PIO
        case PIO: //  Parallel I/O
            SCLK = 0;
            PO7 = ( (byte_value & IO_MASK)  == IO_MASK )?1:0;
            PO6 = ( (byte_value & 0x40)  == 0x40 )?1:0;
            P3 = (byte_value & 0x3f) | (P3 & 0xc0);
            SCLK = 1;
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: //  Double transfer rate single I/O
            cycle_cnt = 4;
             for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                SI = ( (byte_value & IO_MASK) == IO_MASK )?1:0;
                byte_value = byte_value << 1;
    
                SCLK = 1;
                SI = ( (byte_value & IO_MASK) == IO_MASK )?1:0;
                byte_value = byte_value << 1;
            }
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: //  Double transfer rate dual I/O
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
                SCLK = 1;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
            }
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: //  Double transfer rate quad I/O
            SCLK = 0;
            P1 = (byte_value & 0xf0);
            SCLK = 1;
            byte_value = byte_value << 4;
            P1 = (byte_value & 0xf0);  // CS# and SCLK must be zero at this phase
            break;
    #endif
        default:
            break;
        }
    #else
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // Single I/O
            //--- insert your code here for single IO transfer. ---//
            break;
    #endif
    #ifdef DIO
        case DIO: // Dual I/O
            //--- insert your code here for dual IO transfer. ---//
            break;
    #endif
    #ifdef QIO
        case QIO: // Quad I/O
            //--- insert your code here for quad IO transfer. ---//
            break;
    #endif
    #ifdef PIO
        case PIO: // Parallel I/O
            //--- insert your code here for parallel IO transfer. ---//
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: // Double transfer rate Single I/O
            //--- insert your code here for DT single IO transfer. ---//
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: // Double transfer rate Dual I/O
            //--- insert your code here for DT dual IO transfer. ---//
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: // Double transfer rate Quad I/O
            //--- insert your code here for DT quad IO transfer. ---//
            break;
    #endif
        default:
            break;
        }
    #endif  /* End of GPIO_SPI */
    }
    /*
     * Function:       GetByte
     * Arguments:      byte_value, data receive from flash
     *                 transfer_type, select different type of I/O mode.
     *                 Seven mode:
     *                 SIO, single IO
     *                 DIO, dual IO
     *                 QIO, quad IO
     *                 PIO, parallel IO
     *                 DTSIO, double transfer rate SIO
     *                 DTDIO, double transfer rate DIO
     *                 DTQIO, double transfer rate QIO
     * Description:    Get one byte data to flash
     * Return Message: 8 bit data
     */
    uint8 GetByte( uint8 transfer_type )
    {
        uint8 data_buf;
    	data_buf = SPI_ReceiveData();//必须先读取一下,防止接收缓存中存有数据
    
    	SendByte( DUMMY_BYTE, SIO );
    	while(SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET);
    	data_buf = SPI_ReceiveData();
    
    	
    #ifdef GPIO_SPI
        uint16 i;
        uint8 cycle_cnt;
        data_buf = 0;
        cycle_cnt = 8 >> transfer_type;
    
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // single I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SO = 1;
            // End VIP 8051 GPIO
    
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                if ( SO == 1 ){
                    data_buf = (data_buf | (0x80 >> i));
                }
                SCLK = 1;
            }
            break;
    #endif
    #ifdef DIO
        case DIO: // dual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            // End VIP 8051 GPIO
    
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                data_buf = data_buf << 2;
                data_buf = ( data_buf | ((P1 & 0x30) >> 4 ) );
                SCLK = 1;
            }
            break;
    #endif
    #ifdef QIO
        case QIO: // quad I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            SIO2 = 1;
            SIO3 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = P1 & 0xf0;
            SCLK = 1;
            SCLK = 0;
            data_buf = ((P1 & 0xf0)>> 4)| data_buf;
            SCLK = 1;
            break;
    #endif
    #ifdef PIO
        case PIO: //  Parallel I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            PO7 = 1;
            PO6 = 1;
            PO5 = 1;
            PO4 = 1;
            PO3 = 1;
            PO2 = 1;
            PO1 = 1;
            PO0 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = (( P1 & 0x20 )<< 2) | ((P1 & 0x02 ) << 5) | (P3 & 0x3f );
            SCLK = 1;
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: //  Double transfer rate Single I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SO = 1;
            // End VIP 8051 GPIO
            cycle_cnt = 4;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                if ( SO == 1 ){
                    data_buf = (data_buf | ( 0x80 >> (i*2) ));
                }
                SCLK = 1;
                if ( SO == 1 ){
                    data_buf = (data_buf | (0x80 >> ((i*2) + 1) ));
                }
            }
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: //  Double transfer rate Dual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            // End VIP 8051 GPIO
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                data_buf = data_buf << 2;
                data_buf = ( data_buf  | ( (P1 & 0x30) >> 4 ) );
                SCLK = 1;
                data_buf = data_buf << 2;
                data_buf = ( data_buf  | ( (P1 & 0x30) >> 4 ) );
            }
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: //  DTR qual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            SIO2 = 1;
            SIO3 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = P1 & 0xf0;
            SCLK = 1;
            data_buf = ( (P1 & 0xf0) >> 4 )| data_buf;
            break;
    #endif
        default:
            break;
    
        }
    #else
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // Single I/O
            //--- insert your code here for single IO receive. ---//
            break;
    #endif
    #ifdef DIO
        case DIO: // Dual I/O
            //--- insert your code here for dual IO receive. ---//
            break;
    #endif
    #ifdef QIO
        case QIO: // Quad I/O
            //--- insert your code here for qual IO receive. ---//
            break;
    #endif
    #ifdef PIO
        case PIO: // Parallel I/O
            //--- insert your code here for parallel IO receive. ---//
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: // Double transfer rate Single I/O
            //--- insert your code here for DT single IO receive. ---//
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: // Double transfer rate Dual I/O
            //--- insert your code here for DT dual IO receive. ---//
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: // Double transfer rate Qual I/O
            //--- insert your code here for DT quad IO receive. ---//
    #endif
        default:
            break;
        }
    #endif  /* End of GPIO_SPI */
        return data_buf;
    }
    
    /*
     * Function:       WaitFlashReady
     * Arguments:      ExpectTime, expected time-out value of flash operations.
     *                 No use at non-synchronous IO mode.
     * Description:    Synchronous IO:
     *                 If flash is ready return TRUE.
     *                 If flash is time-out return FALSE.
     *                 Non-synchronous IO:
     *                 Always return TRUE
     * Return Message: TRUE, FALSE
     */
    BOOL WaitFlashReady( uint32 ExpectTime )
    {
    #ifndef NON_SYNCHRONOUS_IO
        uint32 temp = 0;
        while( IsFlashBusy() )
        {
            if( temp > ExpectTime )
            {
                return FALSE;
            }
            temp = temp + 1;
        }
           return TRUE;
    #else
        return TRUE;
    #endif
    }
    
    /*
     * Function:       WaitRYBYReady
     * Arguments:      ExpectTime, expected time-out value of flash operations.
     *                 No use at non-synchronous IO mode.
     * Description:    Synchronous IO:
     *                 If flash is ready return TRUE.
     *                 If flash is time-out return FALSE.
     *                 Non-synchronous IO:
     *                 Always return TRUE
     * Return Message: TRUE, FALSE
     */
    BOOL WaitRYBYReady( uint32 ExpectTime )
    {
    #ifndef NON_SYNCHRONOUS_IO
        uint32 temp = 0;
    #ifdef GPIO_SPI
        while( SO == 0 )
    #else
        // Insert your code for waiting RYBY (SO) pin ready
    #endif
        {
            if( temp > ExpectTime )
            {
                return FALSE;
            }
            temp = temp + 1;
        }
        return TRUE;
    
    #else
        return TRUE;
    #endif
    }
    
    /*
     * Function:       IsFlashBusy
     * Arguments:      None.
     * Description:    Check status register WIP bit.
     *                 If  WIP bit = 1: return TRUE ( Busy )
     *                             = 0: return FALSE ( Ready ).
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlashBusy( void )
    {
        uint8  gDataBuffer;
    
        CMD_RDSR( &gDataBuffer );
        if( (gDataBuffer & FLASH_WIP_MASK)  == FLASH_WIP_MASK )
            return TRUE;
        else
            return FALSE;
    }
    
    /*
     * Function:       IsFlashQIO
     * Arguments:      None.
     * Description:    If flash QE bit = 1: return TRUE
     *                                 = 0: return FALSE.
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlashQIO( void )
    {
    #ifdef FLASH_NO_QE_BIT
        return TRUE;
    #else
        uint8  gDataBuffer;
        CMD_RDSR( &gDataBuffer );
        if( (gDataBuffer & FLASH_QE_MASK) == FLASH_QE_MASK )
            return TRUE;
        else
            return FALSE;
    #endif
    }
    /*
     * Function:       IsFlash4Byte
     * Arguments:      None
     * Description:    Check flash address is 3-byte or 4-byte.
     *                 If flash 4BYTE bit = 1: return TRUE
     *                                    = 0: return FALSE.
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlash4Byte( void )
    {
    #ifdef FLASH_CMD_RDSCUR
        #ifdef FLASH_4BYTE_ONLY
            return TRUE;
        #elif FLASH_3BYTE_ONLY
            return FALSE;
        #else
            uint8  gDataBuffer;
            CMD_RDSCUR( &gDataBuffer );
            if( (gDataBuffer & FLASH_4BYTE_MASK) == FLASH_4BYTE_MASK )
                return TRUE;
            else
                return FALSE;
        #endif
    #else
        return FALSE;
    #endif
    }
    /*
     * Function:       SendFlashAddr
     * Arguments:      flash_address, 32 bit flash memory address
     *                 io_mode, I/O mode to transfer address
     *                 addr_4byte_mode,
     * Description:    Send flash address with 3-byte or 4-byte mode.
     * Return Message: None
     */
    void SendFlashAddr( uint32 flash_address, uint8 io_mode, uint8 addr_4byte_mode )
    {
        /* Check flash is 3-byte or 4-byte mode.
           4-byte mode: Send 4-byte address (A31-A0)
           3-byte mode: Send 3-byte address (A23-A0) */
        if( addr_4byte_mode == TRUE ){
            SendByte( (flash_address >> 24), io_mode ); // A31-A24
        }
        /* A23-A0 */
        SendByte( (flash_address >> 16), io_mode );
        SendByte( (flash_address >> 8), io_mode );
        SendByte( (flash_address), io_mode );
    }
    
    /*
     * ID Command
     */
    
    /*
     * Function:       CMD_RDID
     * Arguments:      Identification, 32 bit buffer to store id
     * Description:    The RDID instruction is to read the manufacturer ID
     *                 of 1-byte and followed by Device ID of 2-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDID( uint32 *Identification )
    {
        uint32 temp;
        uint8  gDataBuffer[3];
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command
        SendByte( FLASH_CMD_RDID, SIO );
    
        // Get manufacturer identification, device identification
        gDataBuffer[0] = GetByte( SIO );
        gDataBuffer[1] = GetByte( SIO );
        gDataBuffer[2] = GetByte( SIO );
    
        // Chip select go high to end a command
        CS_High();
    
        // Store identification
        temp =  (u32)(gDataBuffer[0]);
        temp =  (u32)((temp << 8) | gDataBuffer[1]);
        *Identification =  (u32)((temp << 8) | gDataBuffer[2]);
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_RES
     * Arguments:      ElectricIdentification, 8 bit buffer to store electric id
     * Description:    The RES instruction is to read the Device
     *                 electric identification of 1-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RES( uint8 *ElectricIdentification )
    {
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send flash command and insert dummy cycle
        SendByte( FLASH_CMD_RES, SIO );
        InsertDummyCycle( 24 );
    
        // Get electric identification
        *ElectricIdentification = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_REMS
     * Arguments:      REMS_Identification, 16 bit buffer to store id
     *                 fsptr, pointer of flash status structure
     * Description:    The REMS instruction is to read the Device
     *                 manufacturer ID and electric ID of 1-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_REMS( uint16 *REMS_Identification, FlashStatus *fsptr )
    {
        uint8  gDataBuffer[2];
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send flash command and insert dummy cycle ( if need )
        // ArrangeOpt = 0x00 will output the manufacturer's ID first
        //            = 0x01 will output electric ID first
        SendByte( FLASH_CMD_REMS, SIO );
        InsertDummyCycle( 16 );
        SendByte( fsptr->ArrangeOpt, SIO );
    
        // Get ID
        gDataBuffer[0] = GetByte( SIO );
        gDataBuffer[1] = GetByte( SIO );
    
        // Store identification informaion
        *REMS_Identification = (gDataBuffer[0] << 8) | gDataBuffer[1];
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Register  Command
     */
    
    /*
     * Function:       CMD_RDSR
     * Arguments:      StatusReg, 8 bit buffer to store status register value
     * Description:    The RDSR instruction is for reading Status Register Bits.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDSR( uint8 *StatusReg )
    {
        uint8  gDataBuffer;
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command
        SendByte( FLASH_CMD_RDSR, SIO );
        gDataBuffer = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        *StatusReg = gDataBuffer;
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_WRSR
     * Arguments:      UpdateValue, 8/16 bit status register value to updata
     * Description:    The WRSR instruction is for changing the values of
     *                 Status Register Bits (and configuration register)
     * Return Message: FlashIsBusy, FlashTimeOut, FlashOperationSuccess
     */
    #ifdef SUPPORT_WRSR_CR
    ReturnMsg CMD_WRSR( uint16 UpdateValue )
    #else
    ReturnMsg CMD_WRSR( uint8 UpdateValue )
    #endif
    {
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command and update value
        SendByte( FLASH_CMD_WRSR, SIO );
        SendByte( UpdateValue, SIO );
    #ifdef SUPPORT_WRSR_CR
        SendByte( UpdateValue >> 8, SIO );    // write configuration register
    #endif
    
        // Chip select go high to end a flash command
        CS_High();
    
    
        if( WaitFlashReady( WriteStatusRegCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    
    }
    
    /*
     * Function:       CMD_RDSCUR
     * Arguments:      SecurityReg, 8 bit buffer to store security register value
     * Description:    The RDSCUR instruction is for reading the value of
     *                 Security Register bits.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDSCUR( uint8 *SecurityReg )
    {
        uint8  gDataBuffer;
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Send command
        SendByte( FLASH_CMD_RDSCUR, SIO );
        gDataBuffer = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        *SecurityReg = gDataBuffer;
    
        return FlashOperationSuccess;
    
    }
    
    /*
     * Function:       CMD_WRSCUR
     * Arguments:      None.
     * Description:    The WRSCUR instruction is for changing the values of
     *                 Security Register Bits.
     * Return Message: FlashIsBusy, FlashOperationSuccess, FlashWriteRegFailed,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_WRSCUR( void )
    {
        uint8  gDataBuffer;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write WRSCUR command
        SendByte( FLASH_CMD_WRSCUR, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( WriteSecuRegCycleTime ) ){
    
            CMD_RDSCUR( &gDataBuffer );
    
            // Check security register LDSO bit
            if( (gDataBuffer & FLASH_LDSO_MASK) == FLASH_LDSO_MASK )
                    return FlashOperationSuccess;
            else
                    return FlashWriteRegFailed;
        }
        else
            return FlashTimeOut;
    
    }
    
    
    /*
     * Read Command
     */
    
    /*
     * Function:       CMD_READ
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The READ instruction is for reading data out.
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_READ( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write READ command and address
        SendByte( FLASH_CMD_READ, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Set a loop to read data into buffer
        for( index=0; index < byte_length; index++ )
        {
            // Read data one byte at a time
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_DREAD
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The DREAD instruction enable double throughput of Serial
     *                 Flash in read mode
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_DREAD( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;    // 4-byte mode
        else
            addr_4byte_mode = FALSE;   // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write 2-I/O Read command and address
        SendByte( FLASH_CMD_DREAD, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle( 8 );                    // Wait 8 dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( DIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_FASTREAD
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The FASTREAD instruction is for quickly reading data out.
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_FASTREAD( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Fast Read command, address and dummy cycle
        SendByte( FLASH_CMD_FASTREAD, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle ( 8 );          // Wait dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_RDSFDP
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    RDSFDP can retrieve the operating characteristics, structure
     *                 and vendor-specified information such as identifying information,
     *                 memory size, operating voltages and timinginformation of device
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_RDSFDP( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Read SFDP command
        SendByte( FLASH_CMD_RDSFDP, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle ( 8 );        // Insert dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    /*
     * Program Command
     */
    
    /*
     * Function:       CMD_WREN
     * Arguments:      None.
     * Description:    The WREN instruction is for setting
     *                 Write Enable Latch (WEL) bit.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_WREN( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Enable command = 0x06, Setting Write Enable Latch Bit
        SendByte( FLASH_CMD_WREN, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_WRDI
     * Arguments:      None.
     * Description:    The WRDI instruction is to reset
     *                 Write Enable Latch (WEL) bit.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_WRDI( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Disable command = 0x04, resets Write Enable Latch Bit
        SendByte( FLASH_CMD_WRDI, SIO );
    
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_PP
     * Arguments:      flash_address, 32 bit flash memory address
     *                 source_address, buffer address of source data to program
     *                 byte_length, byte length of data to programm
     * Description:    The PP instruction is for programming
     *                 the memory to be "0".
     *                 The device only accept the last 256 byte ( or 32 byte ) to program.
     *                 If the page address ( flash_address[7:0] ) reach 0xFF, it will
     *                 program next at 0x00 of the same page.
     *                 Some products have smaller page size ( 32 byte )
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_PP( uint32 flash_address, uint8 *source_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Page Program command
        SendByte( FLASH_CMD_PP, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Set a loop to down load whole page data into flash's buffer
        // Note: only last 256 byte ( or 32 byte ) will be programmed
        for( index=0; index < byte_length; index++ )
        {
            SendByte( *(source_address + index), SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( PageProgramCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Erase Command
     */
    
    /*
     * Function:       CMD_SE
     * Arguments:      flash_address, 32 bit flash memory address
     * Description:    The SE instruction is for erasing the data
     *                 of the chosen sector (4KB) to be "1".
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_SE( uint32 flash_address )
    {
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Sector Erase command = 0x20;
        SendByte( FLASH_CMD_SE, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( SectorEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Function:       CMD_BE
     * Arguments:      flash_address, 32 bit flash memory address
     * Description:    The BE instruction is for erasing the data
     *                 of the chosen sector (64KB) to be "1".
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_BE( uint32 flash_address )
    {
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Block Erase command = 0xD8;
        SendByte( FLASH_CMD_BE, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( BlockEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    /*
     * Function:       CMD_CE
     * Arguments:      None.
     * Description:    The CE instruction is for erasing the data
     *                 of the whole chip to be "1".
     * Return Message: FlashIsBusy, FlashOperationSuccess, FlashTimeOut
     */
    ReturnMsg CMD_CE( void )
    {
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Chip Erase command = 0x60;
        SendByte( FLASH_CMD_CE, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( ChipEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Mode setting Command
     */
    
    /*
     * Function:       CMD_DP
     * Arguments:      None.
     * Description:    The DP instruction is for setting the
     *                 device on the minimizing the power consumption.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_DP( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Deep Power Down Mode command
        SendByte( FLASH_CMD_DP, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_RDP
     * Arguments:      None.
     * Description:    The Release from RDP instruction is
     *                 putting the device in the Stand-by Power mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDP( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Deep Power Down Mode command
        SendByte( FLASH_CMD_RDP, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_ENSO
     * Arguments:      None.
     * Description:    The ENSO instruction is for entering the secured OTP mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_ENSO( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write ENSO command
        SendByte( FLASH_CMD_ENSO, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_EXSO
     * Arguments:      None.
     * Description:    The EXSO instruction is for exiting the secured OTP mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_EXSO( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write EXSO command = 0xC1
        SendByte( FLASH_CMD_EXSO, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Reset setting Command
     */
    
    /*
     * Security Command
     */

注意在uint8 GetByte( uint8 transfer\_type )函数的这句话

data\_buf = SPI\_ReceiveData();//必须先读取一下,防止接收缓存中存有数据

好了,调试一下,果然成功获取该SPI FLASH的值.

那我用IO方式验证一下.代码如下:

/*
     --Common functions
     */
    
    /*
     * Function:       Wait_Flash_WarmUp
     * Arguments:      None.
     * Description:    Wait some time until flash read / write enable.
     * Return Message: None.
     */
    void Wait_Flash_WarmUp()
    {
        uint32 time_cnt = FlashFullAccessTime;
        while( time_cnt > 0 )
        {
            time_cnt--;
        }
    }
    
    /*
     * Function:       Initial_Spi
     * Arguments:      None
     * Description:    Initial spi flash state and wait flash warm-up
     *                 (enable read/write).
     * Return Message: None
     */
    void Initial_Spi()
    {
    
    #ifdef GPIO_SPI
        WPn = 1;        // Write potected initial high
        SI = 0;         // Flash input data
        SCLK = 1;       // Flash input clock
        CSn = 1;        // Chip Select
    #endif
    	GPIO_Init(CS_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_SCK_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_MOSI_PIN,GPIO_MODE_OUT_PP_HIGH_FAST);
    	GPIO_Init(SPI_MISO_PIN,GPIO_MODE_IN_PU_NO_IT);
    
    	//SPI_DeInit();
    	//SPI_Init(SPI_FIRSTBIT_MSB,SPI_BAUDRATEPRESCALER_2,SPI_MODE_MASTER,SPI_CLOCKPOLARITY_HIGH,\
    	//	SPI_CLOCKPHASE_2EDGE,SPI_DATADIRECTION_2LINES_FULLDUPLEX,SPI_NSS_SOFT,0x07);
    	//SPI_Cmd(TRUE);
    
    	// Wait flash warm-up
        Wait_Flash_WarmUp();
    }
    
    /*
     * Function:       CS_Low, CS_High
     * Arguments:      None.
     * Description:    Chip select go low / high.
     * Return Message: None.
     */
    void CS_Low()
    {
    #ifdef GPIO_SPI
        CSn = 0;
    #else
        //--- insert your chip select code here. ---//
        GPIO_WriteLow(CS_PIN);
    #endif
    }
    
    void CS_High()
    {
    #ifdef GPIO_SPI
        CSn = 1;
        WPn = 1;
    #else
        //--- insert your chip select code here. ---//
        GPIO_WriteHigh(CS_PIN);
    #endif
    }
    
    /*
     * Function:       InsertDummyCycle
     * Arguments:      dummy_cycle, number of dummy clock cycle
     * Description:    Insert dummy cycle of SCLK
     * Return Message: None.
     */
    void InsertDummyCycle( uint8 dummy_cycle )
    {
    #ifdef GPIO_SPI
        uint8 i;
        for( i=0; i < dummy_cycle; i=i+1 )
        {
            SCLK = 0;
            SCLK = 1;
        }
    #else
        //--- insert your code here. ---//
        uint8 i;
        #if 0
        for( i=0; i < dummy_cycle / 8 ; i=i+1 )
        {
    		SPI_SendData(DUMMY_BYTE);
        }
    	#else
    
    
        for( i=0; i < dummy_cycle; i=i+1 )
        {
    		GPIO_WriteLow(SPI_SCK_PIN);
    		GPIO_WriteHigh(SPI_SCK_PIN);
        }
    	
    	#endif
    #endif
    }
    
    /*
     * Function:       SendByte
     * Arguments:      byte_value, data transfer to flash
     *                 transfer_type, select different type of I/O mode.
     *                 Seven mode:
     *                 SIO, single IO
     *                 DIO, dual IO
     *                 QIO, quad IO
     *                 PIO, parallel
     *                 DTSIO, double transfer rate SIO
     *                 DTDIO, double transfer rate DIO
     *                 DTQIO, double transfer rate QIO
     * Description:    Send one byte data to flash
     * Return Message: None.
     */
    void SendByte( uint8 byte_value, uint8 transfer_type )
    {
        uint16 i;
        uint8 cycle_cnt;
    #if 0
    	while(SPI_GetFlagStatus(SPI_FLAG_TXE) == RESET);
    
    	SPI_SendData(byte_value);
    #else
            cycle_cnt = 8;
            for( i= 0; i < cycle_cnt; i++ )
            {
                if ( (byte_value & IO_MASK) == 0x80 ){
    				GPIO_WriteHigh(SPI_MOSI_PIN);
                }
                else{
    				GPIO_WriteLow(SPI_MOSI_PIN);			
                }
    			GPIO_WriteLow(SPI_SCK_PIN);			
                byte_value = byte_value << 1;
    			GPIO_WriteHigh(SPI_SCK_PIN);
            }
    
    #endif
    #ifdef GPIO_SPI
    
    
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // single I/O
            cycle_cnt = 8;
            for( i= 0; i < cycle_cnt; i++ )
            {
                if ( (byte_value & IO_MASK) == 0x80 ){
                    SI = 1;
                }
                else{
                    SI = 0;
                }
                SCLK = 0;
                byte_value = byte_value << 1;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef DIO
        case DIO: // dual I/O
            cycle_cnt = 4;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef QIO
        case QIO: // quad I/O
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                P1 = (byte_value & 0xf0);  // CS# and SCLK must be zero at this phase
                byte_value = byte_value << 4;
                SCLK = 1;
            }
            break;
    #endif
    #ifdef PIO
        case PIO: //  Parallel I/O
            SCLK = 0;
            PO7 = ( (byte_value & IO_MASK)  == IO_MASK )?1:0;
            PO6 = ( (byte_value & 0x40)  == 0x40 )?1:0;
            P3 = (byte_value & 0x3f) | (P3 & 0xc0);
            SCLK = 1;
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: //  Double transfer rate single I/O
            cycle_cnt = 4;
             for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                SI = ( (byte_value & IO_MASK) == IO_MASK )?1:0;
                byte_value = byte_value << 1;
    
                SCLK = 1;
                SI = ( (byte_value & IO_MASK) == IO_MASK )?1:0;
                byte_value = byte_value << 1;
            }
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: //  Double transfer rate dual I/O
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
                SCLK = 1;
                P1 = (( byte_value & 0xc0 ) >> 2) | (P1 & 0xcf);
                byte_value = byte_value << 2;
            }
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: //  Double transfer rate quad I/O
            SCLK = 0;
            P1 = (byte_value & 0xf0);
            SCLK = 1;
            byte_value = byte_value << 4;
            P1 = (byte_value & 0xf0);  // CS# and SCLK must be zero at this phase
            break;
    #endif
        default:
            break;
        }
    #else
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // Single I/O
            //--- insert your code here for single IO transfer. ---//
            break;
    #endif
    #ifdef DIO
        case DIO: // Dual I/O
            //--- insert your code here for dual IO transfer. ---//
            break;
    #endif
    #ifdef QIO
        case QIO: // Quad I/O
            //--- insert your code here for quad IO transfer. ---//
            break;
    #endif
    #ifdef PIO
        case PIO: // Parallel I/O
            //--- insert your code here for parallel IO transfer. ---//
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: // Double transfer rate Single I/O
            //--- insert your code here for DT single IO transfer. ---//
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: // Double transfer rate Dual I/O
            //--- insert your code here for DT dual IO transfer. ---//
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: // Double transfer rate Quad I/O
            //--- insert your code here for DT quad IO transfer. ---//
            break;
    #endif
        default:
            break;
        }
    #endif  /* End of GPIO_SPI */
    }
    /*
     * Function:       GetByte
     * Arguments:      byte_value, data receive from flash
     *                 transfer_type, select different type of I/O mode.
     *                 Seven mode:
     *                 SIO, single IO
     *                 DIO, dual IO
     *                 QIO, quad IO
     *                 PIO, parallel IO
     *                 DTSIO, double transfer rate SIO
     *                 DTDIO, double transfer rate DIO
     *                 DTQIO, double transfer rate QIO
     * Description:    Get one byte data to flash
     * Return Message: 8 bit data
     */
    uint8 GetByte( uint8 transfer_type )
    {
        uint8 data_buf;
    	uint16 i;
        uint8 cycle_cnt;
        data_buf = 0;
    
    #if 0	
    	data_buf = SPI_ReceiveData();
    
    	SendByte( DUMMY_BYTE, SIO );
    	while(SPI_GetFlagStatus(SPI_FLAG_RXNE) == RESET);
    	data_buf = SPI_ReceiveData();
    #else
        cycle_cnt = 8;
    
        for( i= 0; i < cycle_cnt; i++ )
        {
    		GPIO_WriteLow(SPI_SCK_PIN);			
            if ( GPIO_ReadInputPin(SPI_MISO_PIN) == 1 ){
                data_buf = (data_buf | (0x80 >> i));
            }
    		GPIO_WriteHigh(SPI_SCK_PIN);
        }
    
    
    	
    	
    #endif
    	
    #ifdef GPIO_SPI
        cycle_cnt = 8 >> transfer_type;
    
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // single I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SO = 1;
            // End VIP 8051 GPIO
    
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                if ( SO == 1 ){
                    data_buf = (data_buf | (0x80 >> i));
                }
                SCLK = 1;
            }
            break;
    #endif
    #ifdef DIO
        case DIO: // dual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            // End VIP 8051 GPIO
    
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                data_buf = data_buf << 2;
                data_buf = ( data_buf | ((P1 & 0x30) >> 4 ) );
                SCLK = 1;
            }
            break;
    #endif
    #ifdef QIO
        case QIO: // quad I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            SIO2 = 1;
            SIO3 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = P1 & 0xf0;
            SCLK = 1;
            SCLK = 0;
            data_buf = ((P1 & 0xf0)>> 4)| data_buf;
            SCLK = 1;
            break;
    #endif
    #ifdef PIO
        case PIO: //  Parallel I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            PO7 = 1;
            PO6 = 1;
            PO5 = 1;
            PO4 = 1;
            PO3 = 1;
            PO2 = 1;
            PO1 = 1;
            PO0 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = (( P1 & 0x20 )<< 2) | ((P1 & 0x02 ) << 5) | (P3 & 0x3f );
            SCLK = 1;
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: //  Double transfer rate Single I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SO = 1;
            // End VIP 8051 GPIO
            cycle_cnt = 4;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                if ( SO == 1 ){
                    data_buf = (data_buf | ( 0x80 >> (i*2) ));
                }
                SCLK = 1;
                if ( SO == 1 ){
                    data_buf = (data_buf | (0x80 >> ((i*2) + 1) ));
                }
            }
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: //  Double transfer rate Dual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            // End VIP 8051 GPIO
            cycle_cnt = 2;
            for( i= 0; i < cycle_cnt; i++ )
            {
                SCLK = 0;
                data_buf = data_buf << 2;
                data_buf = ( data_buf  | ( (P1 & 0x30) >> 4 ) );
                SCLK = 1;
                data_buf = data_buf << 2;
                data_buf = ( data_buf  | ( (P1 & 0x30) >> 4 ) );
            }
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: //  DTR qual I/O
            // Set VIP 8051 GPIO as input ( need pull to high )
            SIO0 = 1;
            SIO1 = 1;
            SIO2 = 1;
            SIO3 = 1;
            // End VIP 8051 GPIO
            SCLK = 0;
            data_buf = P1 & 0xf0;
            SCLK = 1;
            data_buf = ( (P1 & 0xf0) >> 4 )| data_buf;
            break;
    #endif
        default:
            break;
    
        }
    #else
        switch( transfer_type )
        {
    #ifdef SIO
        case SIO: // Single I/O
            //--- insert your code here for single IO receive. ---//
            break;
    #endif
    #ifdef DIO
        case DIO: // Dual I/O
            //--- insert your code here for dual IO receive. ---//
            break;
    #endif
    #ifdef QIO
        case QIO: // Quad I/O
            //--- insert your code here for qual IO receive. ---//
            break;
    #endif
    #ifdef PIO
        case PIO: // Parallel I/O
            //--- insert your code here for parallel IO receive. ---//
            break;
    #endif
    #ifdef DTSIO
        case DTSIO: // Double transfer rate Single I/O
            //--- insert your code here for DT single IO receive. ---//
            break;
    #endif
    #ifdef DTDIO
        case DTDIO: // Double transfer rate Dual I/O
            //--- insert your code here for DT dual IO receive. ---//
            break;
    #endif
    #ifdef DTQIO
        case DTQIO: // Double transfer rate Qual I/O
            //--- insert your code here for DT quad IO receive. ---//
    #endif
        default:
            break;
        }
    #endif  /* End of GPIO_SPI */
        return data_buf;
    }
    
    /*
     * Function:       WaitFlashReady
     * Arguments:      ExpectTime, expected time-out value of flash operations.
     *                 No use at non-synchronous IO mode.
     * Description:    Synchronous IO:
     *                 If flash is ready return TRUE.
     *                 If flash is time-out return FALSE.
     *                 Non-synchronous IO:
     *                 Always return TRUE
     * Return Message: TRUE, FALSE
     */
    BOOL WaitFlashReady( uint32 ExpectTime )
    {
    #ifndef NON_SYNCHRONOUS_IO
        uint32 temp = 0;
        while( IsFlashBusy() )
        {
            if( temp > ExpectTime )
            {
                return FALSE;
            }
            temp = temp + 1;
        }
           return TRUE;
    #else
        return TRUE;
    #endif
    }
    
    /*
     * Function:       WaitRYBYReady
     * Arguments:      ExpectTime, expected time-out value of flash operations.
     *                 No use at non-synchronous IO mode.
     * Description:    Synchronous IO:
     *                 If flash is ready return TRUE.
     *                 If flash is time-out return FALSE.
     *                 Non-synchronous IO:
     *                 Always return TRUE
     * Return Message: TRUE, FALSE
     */
    BOOL WaitRYBYReady( uint32 ExpectTime )
    {
    #ifndef NON_SYNCHRONOUS_IO
        uint32 temp = 0;
    #ifdef GPIO_SPI
        while( SO == 0 )
    #else
        // Insert your code for waiting RYBY (SO) pin ready
    #endif
        {
            if( temp > ExpectTime )
            {
                return FALSE;
            }
            temp = temp + 1;
        }
        return TRUE;
    
    #else
        return TRUE;
    #endif
    }
    
    /*
     * Function:       IsFlashBusy
     * Arguments:      None.
     * Description:    Check status register WIP bit.
     *                 If  WIP bit = 1: return TRUE ( Busy )
     *                             = 0: return FALSE ( Ready ).
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlashBusy( void )
    {
        uint8  gDataBuffer;
    
        CMD_RDSR( &gDataBuffer );
        if( (gDataBuffer & FLASH_WIP_MASK)  == FLASH_WIP_MASK )
            return TRUE;
        else
            return FALSE;
    }
    
    /*
     * Function:       IsFlashQIO
     * Arguments:      None.
     * Description:    If flash QE bit = 1: return TRUE
     *                                 = 0: return FALSE.
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlashQIO( void )
    {
    #ifdef FLASH_NO_QE_BIT
        return TRUE;
    #else
        uint8  gDataBuffer;
        CMD_RDSR( &gDataBuffer );
        if( (gDataBuffer & FLASH_QE_MASK) == FLASH_QE_MASK )
            return TRUE;
        else
            return FALSE;
    #endif
    }
    /*
     * Function:       IsFlash4Byte
     * Arguments:      None
     * Description:    Check flash address is 3-byte or 4-byte.
     *                 If flash 4BYTE bit = 1: return TRUE
     *                                    = 0: return FALSE.
     * Return Message: TRUE, FALSE
     */
    BOOL IsFlash4Byte( void )
    {
    #ifdef FLASH_CMD_RDSCUR
        #ifdef FLASH_4BYTE_ONLY
            return TRUE;
        #elif FLASH_3BYTE_ONLY
            return FALSE;
        #else
            uint8  gDataBuffer;
            CMD_RDSCUR( &gDataBuffer );
            if( (gDataBuffer & FLASH_4BYTE_MASK) == FLASH_4BYTE_MASK )
                return TRUE;
            else
                return FALSE;
        #endif
    #else
        return FALSE;
    #endif
    }
    /*
     * Function:       SendFlashAddr
     * Arguments:      flash_address, 32 bit flash memory address
     *                 io_mode, I/O mode to transfer address
     *                 addr_4byte_mode,
     * Description:    Send flash address with 3-byte or 4-byte mode.
     * Return Message: None
     */
    void SendFlashAddr( uint32 flash_address, uint8 io_mode, uint8 addr_4byte_mode )
    {
        /* Check flash is 3-byte or 4-byte mode.
           4-byte mode: Send 4-byte address (A31-A0)
           3-byte mode: Send 3-byte address (A23-A0) */
        if( addr_4byte_mode == TRUE ){
            SendByte( (flash_address >> 24), io_mode ); // A31-A24
        }
        /* A23-A0 */
        SendByte( (flash_address >> 16), io_mode );
        SendByte( (flash_address >> 8), io_mode );
        SendByte( (flash_address), io_mode );
    }
    
    /*
     * ID Command
     */
    
    /*
     * Function:       CMD_RDID
     * Arguments:      Identification, 32 bit buffer to store id
     * Description:    The RDID instruction is to read the manufacturer ID
     *                 of 1-byte and followed by Device ID of 2-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDID( uint32 *Identification )
    {
        uint32 temp;
        uint8  gDataBuffer[3];
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command
        SendByte( FLASH_CMD_RDID, SIO );
    
        // Get manufacturer identification, device identification
        gDataBuffer[0] = GetByte( SIO );
        gDataBuffer[1] = GetByte( SIO );
        gDataBuffer[2] = GetByte( SIO );
    
        // Chip select go high to end a command
        CS_High();
    
        // Store identification
        temp =  (u32)(gDataBuffer[0]);
        temp =  (u32)((temp << 8) | gDataBuffer[1]);
        *Identification =  (u32)((temp << 8) | gDataBuffer[2]);
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_RES
     * Arguments:      ElectricIdentification, 8 bit buffer to store electric id
     * Description:    The RES instruction is to read the Device
     *                 electric identification of 1-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RES( uint8 *ElectricIdentification )
    {
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send flash command and insert dummy cycle
        SendByte( FLASH_CMD_RES, SIO );
        InsertDummyCycle( 24 );
    
        // Get electric identification
        *ElectricIdentification = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_REMS
     * Arguments:      REMS_Identification, 16 bit buffer to store id
     *                 fsptr, pointer of flash status structure
     * Description:    The REMS instruction is to read the Device
     *                 manufacturer ID and electric ID of 1-byte.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_REMS( uint16 *REMS_Identification, FlashStatus *fsptr )
    {
        uint8  gDataBuffer[2];
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send flash command and insert dummy cycle ( if need )
        // ArrangeOpt = 0x00 will output the manufacturer's ID first
        //            = 0x01 will output electric ID first
        SendByte( FLASH_CMD_REMS, SIO );
        InsertDummyCycle( 16 );
        SendByte( fsptr->ArrangeOpt, SIO );
    
        // Get ID
        gDataBuffer[0] = GetByte( SIO );
        gDataBuffer[1] = GetByte( SIO );
    
        // Store identification informaion
        *REMS_Identification = (gDataBuffer[0] << 8) | gDataBuffer[1];
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Register  Command
     */
    
    /*
     * Function:       CMD_RDSR
     * Arguments:      StatusReg, 8 bit buffer to store status register value
     * Description:    The RDSR instruction is for reading Status Register Bits.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDSR( uint8 *StatusReg )
    {
        uint8  gDataBuffer;
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command
        SendByte( FLASH_CMD_RDSR, SIO );
        gDataBuffer = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        *StatusReg = gDataBuffer;
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_WRSR
     * Arguments:      UpdateValue, 8/16 bit status register value to updata
     * Description:    The WRSR instruction is for changing the values of
     *                 Status Register Bits (and configuration register)
     * Return Message: FlashIsBusy, FlashTimeOut, FlashOperationSuccess
     */
    #ifdef SUPPORT_WRSR_CR
    ReturnMsg CMD_WRSR( uint16 UpdateValue )
    #else
    ReturnMsg CMD_WRSR( uint8 UpdateValue )
    #endif
    {
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Send command and update value
        SendByte( FLASH_CMD_WRSR, SIO );
        SendByte( UpdateValue, SIO );
    #ifdef SUPPORT_WRSR_CR
        SendByte( UpdateValue >> 8, SIO );    // write configuration register
    #endif
    
        // Chip select go high to end a flash command
        CS_High();
    
    
        if( WaitFlashReady( WriteStatusRegCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    
    }
    
    /*
     * Function:       CMD_RDSCUR
     * Arguments:      SecurityReg, 8 bit buffer to store security register value
     * Description:    The RDSCUR instruction is for reading the value of
     *                 Security Register bits.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDSCUR( uint8 *SecurityReg )
    {
        uint8  gDataBuffer;
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Send command
        SendByte( FLASH_CMD_RDSCUR, SIO );
        gDataBuffer = GetByte( SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        *SecurityReg = gDataBuffer;
    
        return FlashOperationSuccess;
    
    }
    
    /*
     * Function:       CMD_WRSCUR
     * Arguments:      None.
     * Description:    The WRSCUR instruction is for changing the values of
     *                 Security Register Bits.
     * Return Message: FlashIsBusy, FlashOperationSuccess, FlashWriteRegFailed,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_WRSCUR( void )
    {
        uint8  gDataBuffer;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write WRSCUR command
        SendByte( FLASH_CMD_WRSCUR, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( WriteSecuRegCycleTime ) ){
    
            CMD_RDSCUR( &gDataBuffer );
    
            // Check security register LDSO bit
            if( (gDataBuffer & FLASH_LDSO_MASK) == FLASH_LDSO_MASK )
                    return FlashOperationSuccess;
            else
                    return FlashWriteRegFailed;
        }
        else
            return FlashTimeOut;
    
    }
    
    
    /*
     * Read Command
     */
    
    /*
     * Function:       CMD_READ
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The READ instruction is for reading data out.
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_READ( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write READ command and address
        SendByte( FLASH_CMD_READ, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Set a loop to read data into buffer
        for( index=0; index < byte_length; index++ )
        {
            // Read data one byte at a time
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_DREAD
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The DREAD instruction enable double throughput of Serial
     *                 Flash in read mode
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_DREAD( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;    // 4-byte mode
        else
            addr_4byte_mode = FALSE;   // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write 2-I/O Read command and address
        SendByte( FLASH_CMD_DREAD, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle( 8 );                    // Wait 8 dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( DIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_FASTREAD
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    The FASTREAD instruction is for quickly reading data out.
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_FASTREAD( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Fast Read command, address and dummy cycle
        SendByte( FLASH_CMD_FASTREAD, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle ( 8 );          // Wait dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_RDSFDP
     * Arguments:      flash_address, 32 bit flash memory address
     *                 target_address, buffer address to store returned data
     *                 byte_length, length of returned data in byte unit
     * Description:    RDSFDP can retrieve the operating characteristics, structure
     *                 and vendor-specified information such as identifying information,
     *                 memory size, operating voltages and timinginformation of device
     * Return Message: FlashAddressInvalid, FlashOperationSuccess
     */
    ReturnMsg CMD_RDSFDP( uint32 flash_address, uint8 *target_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Read SFDP command
        SendByte( FLASH_CMD_RDSFDP, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
        InsertDummyCycle ( 8 );        // Insert dummy cycle
    
        // Set a loop to read data into data buffer
        for( index=0; index < byte_length; index++ )
        {
            *(target_address + index) = GetByte( SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    /*
     * Program Command
     */
    
    /*
     * Function:       CMD_WREN
     * Arguments:      None.
     * Description:    The WREN instruction is for setting
     *                 Write Enable Latch (WEL) bit.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_WREN( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Enable command = 0x06, Setting Write Enable Latch Bit
        SendByte( FLASH_CMD_WREN, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_WRDI
     * Arguments:      None.
     * Description:    The WRDI instruction is to reset
     *                 Write Enable Latch (WEL) bit.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_WRDI( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Disable command = 0x04, resets Write Enable Latch Bit
        SendByte( FLASH_CMD_WRDI, SIO );
    
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Function:       CMD_PP
     * Arguments:      flash_address, 32 bit flash memory address
     *                 source_address, buffer address of source data to program
     *                 byte_length, byte length of data to programm
     * Description:    The PP instruction is for programming
     *                 the memory to be "0".
     *                 The device only accept the last 256 byte ( or 32 byte ) to program.
     *                 If the page address ( flash_address[7:0] ) reach 0xFF, it will
     *                 program next at 0x00 of the same page.
     *                 Some products have smaller page size ( 32 byte )
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_PP( uint32 flash_address, uint8 *source_address, uint32 byte_length )
    {
        uint32 index;
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write Page Program command
        SendByte( FLASH_CMD_PP, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Set a loop to down load whole page data into flash's buffer
        // Note: only last 256 byte ( or 32 byte ) will be programmed
        for( index=0; index < byte_length; index++ )
        {
            SendByte( *(source_address + index), SIO );
        }
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( PageProgramCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Erase Command
     */
    
    /*
     * Function:       CMD_SE
     * Arguments:      flash_address, 32 bit flash memory address
     * Description:    The SE instruction is for erasing the data
     *                 of the chosen sector (4KB) to be "1".
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_SE( uint32 flash_address )
    {
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Sector Erase command = 0x20;
        SendByte( FLASH_CMD_SE, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( SectorEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Function:       CMD_BE
     * Arguments:      flash_address, 32 bit flash memory address
     * Description:    The BE instruction is for erasing the data
     *                 of the chosen sector (64KB) to be "1".
     * Return Message: FlashAddressInvalid, FlashIsBusy, FlashOperationSuccess,
     *                 FlashTimeOut
     */
    ReturnMsg CMD_BE( uint32 flash_address )
    {
        uint8  addr_4byte_mode;
    
        // Check flash address
        if( flash_address > FlashSize ) return FlashAddressInvalid;
    
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Check 3-byte or 4-byte mode
        if( IsFlash4Byte() )
            addr_4byte_mode = TRUE;  // 4-byte mode
        else
            addr_4byte_mode = FALSE; // 3-byte mode
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Block Erase command = 0xD8;
        SendByte( FLASH_CMD_BE, SIO );
        SendFlashAddr( flash_address, SIO, addr_4byte_mode );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( BlockEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    /*
     * Function:       CMD_CE
     * Arguments:      None.
     * Description:    The CE instruction is for erasing the data
     *                 of the whole chip to be "1".
     * Return Message: FlashIsBusy, FlashOperationSuccess, FlashTimeOut
     */
    ReturnMsg CMD_CE( void )
    {
        // Check flash is busy or not
        if( IsFlashBusy() )    return FlashIsBusy;
    
        // Setting Write Enable Latch bit
        CMD_WREN();
    
        // Chip select go low to start a flash command
        CS_Low();
    
        //Write Chip Erase command = 0x60;
        SendByte( FLASH_CMD_CE, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        if( WaitFlashReady( ChipEraseCycleTime ) )
            return FlashOperationSuccess;
        else
            return FlashTimeOut;
    }
    
    
    /*
     * Mode setting Command
     */
    
    /*
     * Function:       CMD_DP
     * Arguments:      None.
     * Description:    The DP instruction is for setting the
     *                 device on the minimizing the power consumption.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_DP( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Deep Power Down Mode command
        SendByte( FLASH_CMD_DP, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_RDP
     * Arguments:      None.
     * Description:    The Release from RDP instruction is
     *                 putting the device in the Stand-by Power mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_RDP( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Deep Power Down Mode command
        SendByte( FLASH_CMD_RDP, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_ENSO
     * Arguments:      None.
     * Description:    The ENSO instruction is for entering the secured OTP mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_ENSO( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write ENSO command
        SendByte( FLASH_CMD_ENSO, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    /*
     * Function:       CMD_EXSO
     * Arguments:      None.
     * Description:    The EXSO instruction is for exiting the secured OTP mode.
     * Return Message: FlashOperationSuccess
     */
    ReturnMsg CMD_EXSO( void )
    {
        // Chip select go low to start a flash command
        CS_Low();
    
        // Write EXSO command = 0xC1
        SendByte( FLASH_CMD_EXSO, SIO );
    
        // Chip select go high to end a flash command
        CS_High();
    
        return FlashOperationSuccess;
    }
    
    
    /*
     * Reset setting Command
     */
    
    /*
     * Security Command
     */

验证结果也正确的.

博文来自:[http://blog.csdn.net/lan120576664?viewmode=contents][http_blog.csdn.net_lan120576664_viewmode_contents]

[http_bbs.21ic.com_forum.php_mod_viewthread_tid_788880_epclose_1]: http://bbs.21ic.com/forum.php?mod=viewthread&tid=788880&epclose=1
[http_blog.csdn.net_lan120576664_viewmode_contents]: http://blog.csdn.net/lan120576664?viewmode=contents