CCS/MSP430F6779A: Custom Boot loader Design Help

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#include "BSL_Device_File.h"
#include "BSL430_API.h"
#include "BSL430_Command_Definitions.h"

/*******************************************************************************
*  Change Log:
*  2.2.09  LCW   removed RAM erase
*                Changed mass erase and info segments
*  2.2.09  LCW   worked on RAM Loader function
*                Changed Password to XOR
*                Changed Password addr to 0xFFE0
*  --------------------------------------------------------------------------------
*  Version 3 work begins
*  07.08.09 LCW  Removed info erase
*  11.08.09 LCW  bugfix in CRC algorithm
*  --------------------------------------------------------------------------------
*  Version 4 work begins
*  21.12.09 LCW  Removed VPE check
*  15.03.10 LCW  Misc comment cleanup for source release
*  --------------------------------------------------------------------------------
*  Version 4.1 (no output change, source/comment modified)
*  15.04.10 LCW  Changed Version defines to remove warning
*  --------------------------------------------------------------------------------
*  Version 5 work begins
*  18.02.11 LCW  Added USB BSL Buffering for block write
*                disabled GIE at startup
*                uncrustified
*                VPE check removed from word write
*  13.04.11 LCW  Made length varibles unsigned
*  --------------------------------------------------------------------------------
*  Version 6 work begins
*  30.10.12 LCW  Cleared Lock IO on startup
*  --------------------------------------------------------------------------------
*  Version 6.1 (update to align with previous releases)
*  11.03.13 EL  Added definition for LOCKIO
*  --------------------------------------------------------------------------------
*  Version 7 
*  08.05.13 EL  reduced zArea Size to make room for USB Bugfix
*  --------------------------------------------------------------------------------
*  Version 8
*  Aug29.13 BEP  Moved __low_level_init to __program_start to free up code space.
*           BEP  Moved RAM clean up to BSL430_API_init since it does not fit in
*                __program_start.
*******************************************************************************/
#ifdef RAM_BASED_BSL
#    ifdef RAM_WRITE_ONLY_BSL
#        error Can NOT have RAM write and RAM based BSL
#    endif
#    define DEFAULT_STATE (UNLOCKED)
#else
#    define DEFAULT_STATE (LOCKED)
#endif

#ifdef RAM_BASED_BSL
char flushBuffer(void);                   // buffer flush routine, internal for USB only

#    pragma data_alignment=2
__no_init unsigned char BlockBuffer[128];
__no_init unsigned long int BlockBufferStart;
__no_init unsigned long int BlockBufferNext;
__no_init unsigned int BlockBufferPtr;
#endif

#pragma NOINIT(LockedStatus);
volatile unsigned int LockedStatus;
#pragma NOINIT(FwRamKey);
int FwRamKey;

#define API_VERSION (0x08)
#ifdef RAM_WRITE_ONLY_BSL
#    define API_V (API_VERSION + RAM_WRITE_ONLY_BSL)
#else
#    define API_V API_VERSION
#endif
#pragma DATA_SECTION(BSL430_API_Version, ".BSL430_VERSION_API");
const unsigned char BSL430_API_Version = API_V;
#pragma RETAIN(BSL430_API_Version);

// Data section to have the JTAG key in the BSL area @17FCh-17FFh
// 0xFFFFFFFF and 0x00000000 to unlock the JTAG/SBW , 
// and other values to lock JTAG/SBW 
#define JTAGLOCKKEY_SIZE (4)
#pragma DATA_SECTION(JTAGLOCKKEY, ".JTAGLOCK_KEY");
const unsigned char JTAGLOCKKEY[JTAGLOCKKEY_SIZE] = {0xFF,0xFF,0xFF,0xFF};
#pragma RETAIN(JTAGLOCKKEY);

/*******************************************************************************
* *Function:    __low_level_init
* *Description: function used to erase the RAM in device and stop WDT
*******************************************************************************/
#ifndef EXCLUDE_LOW_LEVEL_INIT
#if __VER__ <= 420
void
#else
int
#endif
_system_pre_init(void)
{
    WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog timer
    __disable_interrupt();                // disable interrupts
#if __VER__ > 420
    return 0;                             // do not initialize
#endif
}
#endif

/*******************************************************************************
* *Function:    BSL430_RAM_Clear
* *Description: Clears the contents of RAM
*******************************************************************************/

void BSL430_API_RAM_Clear()
{
#ifndef RAM_BASED_BSL
    unsigned int *size = (unsigned int *)(__get_SP_register() - SECURE_RAM_START);
    do {
        size[(SECURE_RAM_START >> 1) - 1] = 0;          // Clear RAM contents
        size--;
    } while ((unsigned int)size);
#endif
}

/*******************************************************************************
* *Function:    BSL430_API_init
* *Description: sets the key for writing to flash,  sets device state
*******************************************************************************/

void BSL430_API_init()
{
    LockedStatus = DEFAULT_STATE;
    FwRamKey = FWKEY;
#ifdef CLEAR_LOCKIO    
    PMMCTL0_H = PMMPW_H;                  // open PMM registers
    PM5CTL0 &= ~LOCKLPM5;                 // clear lock IO
    PMMCTL0_H = 0x00;                     // close PMM registers
#endif

#ifdef RAM_BASED_BSL
    BlockBufferNext = 0;
    BlockBufferStart = 0;
    BlockBufferPtr = 0;
#endif
}

/*******************************************************************************
* *Function:    BSL430_lock_BSL
* *Description: Locks the BSL
* *Returns:
*             SUCCESSFUL_OPERATION  BSL Locked
*******************************************************************************/

char BSL430_lock_BSL()
{
    LockedStatus = LOCKED;
    return SUCCESSFUL_OPERATION;
}

/*******************************************************************************
* *Function:    BSL430_unlock_BSL
* *Description: Causes the BSL to compare the data buffer against the BSL password
*             BSL state will be UNLOCKED if successful
* *Parameters:
*             char* data            A pointer to an array containing the password
* *Returns:
*             SUCCESSFUL_OPERATION  All data placed into data array successfully
*             BSL_PASSWORD_ERROR    Correct Password was not given
*******************************************************************************/

char BSL430_unlock_BSL(char* data)
{
    int i;
    int retValue = 0;
    char *interrupts = (char*)INTERRUPT_VECTOR_START;

    for (i = 0; i <= (INTERRUPT_VECTOR_END - INTERRUPT_VECTOR_START); i++, interrupts++)
    {
        retValue |=  *interrupts ^ data[i];
    }
    if (retValue == 0)
    {
#ifndef RAM_WRITE_ONLY_BSL
        volatile int i;
        for (i = MASS_ERASE_DELAY - 1; i > 0; i--) ;
#endif
        LockedStatus = UNLOCKED;
        return SUCCESSFUL_OPERATION;
    }
    else
    {
        BSL430_massErase();
        return BSL_PASSWORD_ERROR;
    }
}

/*******************************************************************************
* *Function:    BSL430_toggleInfoLock
* *Description: Toggles the LOCKA bit for writing/erasing info A segment
* *Returns:
*             SUCCESSFUL_OPERATION  Info A is now open for writing or erasing.
*             BSL_LOCKED            Correct Password has not yet been given
*******************************************************************************/

char BSL430_toggleInfoLock()
{
    char exceptions;

    if (LockedStatus == UNLOCKED)
    {
        exceptions = SUCCESSFUL_OPERATION;
        FCTL3 = FwRamKey + LOCKA + (FCTL3 & LOCK); // toggle LOCKA bit
    }
    else
    {
        exceptions = BSL_LOCKED;
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_openMemory
* *Description: Unlocks the Flash for writing
* *Returns:
*             SUCCESSFUL_OPERATION  Flash is now open for writing.
*             BSL_LOCKED            Correct Password has not yet been given
*******************************************************************************/

char BSL430_openMemory()
{
    char exceptions = BSL_LOCKED;

    if (LockedStatus == UNLOCKED)
    {
        exceptions = SUCCESSFUL_OPERATION;
#ifndef RAM_BASED_BSL
        FCTL3 = FwRamKey;                 // Clear Lock bit
        FCTL1 = FwRamKey + WRT;           // Set write bit
#endif
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_closeMemory
* *Description: Locks the Flash against writing
* *Returns:
*             SUCCESSFUL_OPERATION  Flash is now locked.
*******************************************************************************/

char BSL430_closeMemory(void)
{
    FCTL1 = FwRamKey;                     // Clear WRT bit
    FCTL3 = FwRamKey + LOCK;              // Set LOCK bit

    return SUCCESSFUL_OPERATION;
}

/*******************************************************************************
* *Function:    BSL430_readMemory
* *Description: Reads an array of bytes from memory into a supplied array
* *Parameters:
*             unsigned long addr    The address from which the read should begin
*             char length           The amount of bytes to read
*             char* data            The array into which the data will be saved
* *Returns:
*             SUCCESSFUL_OPERATION  All Data placed into data array successfully
*             BSL_LOCKED            Correct Password has not yet been given
*******************************************************************************/

char BSL430_readMemory(unsigned long addr, unsigned int length, char* data)
{
    unsigned long i;

#ifdef RAM_BASED_BSL
    flushBuffer();
#endif
    char exceptions = SUCCESSFUL_OPERATION;

    for (i = addr + length - 1; i >= addr; i--)
    {
        if (LockedStatus == UNLOCKED)
        {
            data[i - addr] = __data20_read_char(i);
        }
        else
        {
            return BSL_LOCKED;
        }
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_crcCheck
* *Description: return a CRC check on the memory specified
* *Parameters:
*           unsigned long addr    The address from which to start the check
*           int length            The length of the data area to check
*           int* return           variable in which to put the return value
* *Returns:
*           SUCCESSFUL_OPERATION  CRC check done correctly
*           BSL_LOCKED            Correct Password has not yet been given
*******************************************************************************/

int BSL430_crcCheck(unsigned long addr, unsigned int length, int* result)
{
    unsigned long i;

#ifdef RAM_BASED_BSL
    flushBuffer();
#endif
    CRCINIRES = 0xFFFF;
    for (i = addr; i < addr + length; i++)
    {
        if (LockedStatus == UNLOCKED)
        {
            CRCDIRB_L = __data20_read_char(i);
        }
        else
        {
            return BSL_LOCKED;
        }
    }
    *result = CRCINIRES;
    return SUCCESSFUL_OPERATION;

}

/*******************************************************************************
* *Function:    BSL430_callAddress
* *Description: Loads the Program Counter with the supplied address
* *Parameters:
*           unsigned long addr    The address to which the function call should go
* *Returns:
*           SUCCESSFUL_OPERATION  Called location has returned
*           BSL_LOCKED            Correct Password has not yet been given
* *Note:
*           If successful, this function does not return.
*******************************************************************************/

char BSL430_callAddress(unsigned long addr)
{
    if (LockedStatus == UNLOCKED)
    {
#ifdef RAM_BASED_BSL
        flushBuffer();
#endif
        ((void (*)())addr)();                                            // type cast addr to
                                                                         // function ptr, call
        return SUCCESSFUL_OPERATION;
    }
    return BSL_LOCKED;                                                   // can only be reached if
                                                                         // BSL is locked

}

/*******************************************************************************
* *Function:    flushBuffer
* *Description: Flushes any remaining data in the buffer
* *Returns:
*             SUCCESSFUL_OPERATION  Flash is now locked.
*******************************************************************************/
#ifdef RAM_BASED_BSL
char flushBuffer(void)
{
    unsigned long i;
    char exceptions = SUCCESSFUL_OPERATION;
    unsigned char* data = &BlockBuffer[0];

    if (LockedStatus == UNLOCKED)
    {
        if (((BlockBufferStart & 0x7F) == 0) && (BlockBufferPtr == 128)) //Buffer is full and
                                                                         // aligned
        {
            while (FCTL3 & BUSY) ;
            FCTL3 = FWKEY;                                               // Clear Lock bit
            FCTL1 = FWKEY + BLKWRT + WRT;                                // Set write/block bit

            for (i = BlockBufferStart; i < BlockBufferStart + 128; i += 4)
            {
                __data20_write_long(i, *((long*)data));
                data += 4;
                while ((FCTL3 & WAIT) == 0) ;
            } // for
        } // if
        else
        {
            FCTL3 = FwRamKey;                                            // Clear Lock bit
            FCTL1 = FwRamKey + WRT;                                      // Set write bit
            for (i = BlockBufferStart; i < BlockBufferStart + BlockBufferPtr; i++)
            {
                if ((BlockBufferStart & 0x01) || i == BlockBufferStart + BlockBufferPtr - 1)
                {
                    exceptions = BSL430_writeByte(i, *data);
                    data += 1;
                }
                else
                {
                    exceptions = BSL430_writeWord(i, *(int *)data);
                    data += 2;
                    i++;
                }
                if (exceptions != SUCCESSFUL_OPERATION)
                {
                    return exceptions;
                } // if
            } // for
        } // else	
		// Lock the flash after writing finished
		FCTL1 = FwRamKey;
		while (FCTL3 & BUSY) ;
		FCTL3 = FwRamKey + LOCK;
		
        BlockBufferStart = 0;
        BlockBufferNext = 0;
        BlockBufferPtr = 0;
    }
    else
    {
        exceptions = BSL_LOCKED;
    }
    return exceptions;
}

#endif

/*******************************************************************************
* *Function:    BSL430_writeMemory
* *Description: Writes a byte array starting at a given address.
*             Note: the function will write in word mode if possible
*             (when start address is even)
* *Parameters:
*           unsigned long startAddr        The address to which the write should begin
*           int size                       The number of bytes to write
*           char* data                     The array of bytes to write (must be even aligned)
* *Returns:
*           SUCCESSFUL_OPERATION           Bytes written successfully
*           MEMORY_WRITE_CHECK_FAILED      A byte in data location post-write does not match data
* *parameter
*                                          Note: write stops immediatly after a byte check fails
*           BSL_LOCKED                     Correct Password has not yet been given
*           VOLTAGE_CHANGE_DURING_PROGRAM  Voltage changed during write (of a single byte/word)
*******************************************************************************/

char BSL430_writeMemory(unsigned long startAddr, unsigned int size,  char* data)
{
    unsigned long i;
    char exceptions = SUCCESSFUL_OPERATION;

    // Note: this function compiles quite differently based on whether the
    // BSL is based out of RAM, or not.  RAM based BSLs can use buffering
    // and perform a block long word write.  This is primarily used for
    // USB BSLs for performance increase.
    // Flash based BSLs will use the second second of code, below

#ifdef RAM_BASED_BSL
    if (LockedStatus == UNLOCKED)
    {
        if ((BlockBufferStart == 0) || BlockBufferNext == startAddr)
        {
            // if we are starting, or continuing a block...
            if (BlockBufferStart == 0)
            {
                BlockBufferStart = startAddr;                 // if starting a new block, reset
                                                              // start addr
            }
            BlockBufferNext =  startAddr + size;              // always update the next addr for
                                                              // streaming
            for (i = 0; i < size;)
            {
                BlockBuffer[BlockBufferPtr++] = *data;        // add the incoming data to the buffer
                data++;
                startAddr++;
                i++;                                          // i incrimented here for check below
                if (((startAddr) & 0x7F) == 0x00)             // we've crossed a 128 byte block
                                                              // boundary
                {
                    flushBuffer();                            // flush out old buffer, writing...
                    // begin write on block boundary
                    return BSL430_writeMemory(startAddr, (size - i), data);
                } // if
            } // for
        } // if buffer start
        else
        {
            // for when data exists in the buffer, but we are jumping to a new place to write...
            flushBuffer();                                    // flush out old buffer, writing..
            return BSL430_writeMemory(startAddr, size, data); // begin buffering new data
        }
    } // if unlocked
    else
    {
        exceptions = BSL_LOCKED;
    }
    // Below is the writeMemory function compiled with Flash based BSLs.
#else
    for (i = startAddr; i < startAddr + size; i++)
    {
#    ifndef RAM_WRITE_ONLY_BSL
        // if the start address is odd, or we're 1 byte from end...
        if ((startAddr & 0x01) || i == startAddr + size - 1)
#    endif
        {
            exceptions = BSL430_writeByte(i, *data);
            data += 1;
        }
#    ifndef RAM_WRITE_ONLY_BSL
        // else, we're on an even addr, and have at least 1 word left..
        else
        {
            exceptions = BSL430_writeWord(i, *(int *)data);
            data += 2;
            i++;
        }
        if (exceptions != SUCCESSFUL_OPERATION)
        {
            return exceptions;
        } // if
#    endif
    }     // for
#endif
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_writeByte
* *Description: Writes a byte at a given address
* *Parameters:
*           unsigned long addr             The address to which the byte should be written
*           char data                      The byte to write
* *Returns:
*           SUCCESSFUL_OPERATION           Byte written successfully
*           MEMORY_WRITE_CHECK_FAILED      Byte in data location post-write does not match data
* *parameter
*           VOLTAGE_CHANGE_DURING_PROGRAM  Voltage changed during write
*           BSL_LOCKED                     Correct Password has not yet been given
*******************************************************************************/

char BSL430_writeByte(unsigned long addr, char data)
{
    char exceptions;

    if (LockedStatus == UNLOCKED)
    {
        exceptions = SUCCESSFUL_OPERATION;
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        __data20_write_char(addr, data);
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        if (data != __data20_read_char(addr))
        {
            exceptions = MEMORY_WRITE_CHECK_FAILED;
        }
#ifndef RAM_WRITE_ONLY_BSL
#    ifndef DO_NOT_CHECK_VPE
        if (FCTL4 & VPE)
        {
            exceptions = VOLTAGE_CHANGE_DURING_PROGRAM;
        }
#    endif
#endif
    }
    else
    {
        exceptions = BSL_LOCKED;
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_writeWord
* *Description: Writes a word at a given address
* *Parameters:
*           unsigned long addr             The address to which the word should be written
*           int data                       The byte to write
* *Returns:
*           SUCCESSFUL_OPERATION           Word written successfully
*           MEMORY_WRITE_CHECK_FAILED      Word in data location post-write does not match data
* *parameter
*           VOLTAGE_CHANGE_DURING_PROGRAM  Voltage changed during write
*           BSL_LOCKED                     Correct Password has not yet been given
*******************************************************************************/

char BSL430_writeWord(unsigned long addr, int data)
{
    char exceptions;

    if (LockedStatus == UNLOCKED)
    {
        exceptions = SUCCESSFUL_OPERATION;
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        __data20_write_short(addr, data);
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        if (data != __data20_read_short(addr))
        {
            exceptions = MEMORY_WRITE_CHECK_FAILED;
        }
#ifndef DO_NOT_CHECK_VPE
        if (FCTL4 & VPE)
        {
            exceptions = VOLTAGE_CHANGE_DURING_PROGRAM;
        }
#endif
    }
    else
    {
        exceptions = BSL_LOCKED;
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_eraseLocation
* *Description: Erases a memory segment which contains a given address
* *Parameters:
*           char block_erase               currently unused 1: erase block 0: erase segment
*           unsigned long addr             An address which is within the segment to be erased
* *Returns:
*           SUCCESSFUL_OPERATION           Segment erased
*           BSL_LOCKED                     Correct Password has not yet been given
*******************************************************************************/

char BSL430_eraseLocation(char block_erase, unsigned long addr)
{
    char exceptions;

    if (LockedStatus == UNLOCKED)
    {
        exceptions = SUCCESSFUL_OPERATION;
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        FCTL3 = FwRamKey;                       // Clear Lock bit
        FCTL1 = FwRamKey + ERASE;               // Set Erase bit
        __data20_write_char(addr, 0);           // Dummy write to erase Flash seg
#ifdef RAM_BASED_BSL
        while (FCTL3 & BUSY) ;
#endif
        FCTL3 = FwRamKey + LOCK;                // Set LOCK bit
    }
    else
    {
        exceptions = BSL_LOCKED;
    }
    return exceptions;
}

/*******************************************************************************
* *Function:    BSL430_massErase
* *Description: Mass erases the entire MSP430 device
* *Returns:
*           SUCCESSFUL_OPERATION           Flash erased
*           BSL_LOCKED                     Correct Password has not yet been given
*******************************************************************************/

char BSL430_massErase()
{
    char exceptions = SUCCESSFUL_OPERATION;
    volatile char *Flash_ptr;                   // Flash pointer

#ifdef RAM_BASED_BSL
    while (FCTL3 & BUSY) ;
#endif
    FCTL3 = FwRamKey;
#ifdef RAM_BASED_BSL
    while (FCTL3 & BUSY) ;
#endif
    Flash_ptr = (char *)INTERRUPT_VECTOR_START; // Initialize Flash pointer
    FCTL1 = FwRamKey + MERAS + ERASE;           // Set Mass Erase bit
    *Flash_ptr = 0;                             // Dummy write to erase main flash
#ifdef RAM_BASED_BSL
    while (FCTL3 & BUSY) ;
#endif
    FCTL3 = FwRamKey + LOCK;                    // Set LOCK bit

    return exceptions;
}