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/**    IAP : internal Flash memory access library
 *
 *        The internal Flash memory access is described in the LPC1768 usermanual. 
 *            http://www.nxp.com/documents/user_manual/UM10360.pdf
 *
 *            Chapter  2: "LPC17xx Memory map"
 *            Chapter 32: "LPC17xx Flash memory interface and programming"
 *                refering Rev. 01 - 4 January 2010
 *
 *        Released under the MIT License: http://mbed.org/license/mit
 *
 *        revision 1.0  09-Mar-2010   1st release
 *        revision 1.1  12-Mar-2010   chaged: to make possible to reserve flash area for user
 *                                            it can be set by USER_FLASH_AREA_START and USER_FLASH_AREA_SIZE in IAP.h
 */

#include    "mbed.h"
#include    "IAP.h"

#define     USER_FLASH_AREA_START_STR( x )      STR( x )
#define     STR( x )                            #x

unsigned char user_area[ USER_FLASH_AREA_SIZE ] __attribute__((section( ".ARM.__at_" USER_FLASH_AREA_START_STR( USER_FLASH_AREA_START ) ), zero_init));


/*
 *  Reserve of flash area is explained by Igor. Please refer next URL
 *    http://mbed.org/users/okano/notebook/iap-in-application-programming-internal-flash-eras/?page=1#comment-271
 */
 
//unsigned char user_area[ size ] __attribute__((section(".ARM.__at_0x78000"), zero_init));

/*
 *  IAP command codes
 *  Table 589. "IAP Command Summary", Chapter 8. "IAP commands", usermanual
 */

enum command_code
        {
            IAPCommand_Prepare_sector_for_write_operation    = 50,
            IAPCommand_Copy_RAM_to_Flash,
            IAPCommand_Erase_sector,
            IAPCommand_Blank_check_sector,
            IAPCommand_Read_part_ID,
            IAPCommand_Read_Boot_Code_version,
            IAPCommand_Compare,
            IAPCommand_Reinvoke_ISP,
            IAPCommand_Read_device_serial_number
        };


/** Read part identification number
 *
 *  @return    device ID
 *  @see       read_serial()
 */

int IAP::read_ID( void ) {
    IAP_command[ 0 ]    = IAPCommand_Read_part_ID;
    
    iap_entry( IAP_command, IAP_result );
    
    //  return ( (int)IAP_result[ 0 ] );
    return ( (int)IAP_result[ 1 ] );    //  to return the number itself (this command always returns CMD_SUCCESS)
}


/** Read device serial number
 *
 *  @return    device serial number
 *  @see       read_ID()
 */

int IAP::read_serial( void ) {
    IAP_command[ 0 ]    = IAPCommand_Read_device_serial_number;
    
    iap_entry( IAP_command, IAP_result );
    
    //  return ( (int)IAP_result[ 0 ] );
    return ( (int)IAP_result[ 1 ] );    //  to return the number itself (this command always returns CMD_SUCCESS)
}


/** Blank check sector(s)
 *  
 *  @param    start    a Start Sector Number
 *  @param    end      an End Sector Number (should be greater than or equal to start sector number).
 *  @return error code: CMD_SUCCESS | BUSY | SECTOR_NOT_BLANK | INVALID_SECTOR
 */

int IAP::blank_check( int start, int end ) {
    IAP_command[ 0 ]    = IAPCommand_Blank_check_sector;
    IAP_command[ 1 ]    = (unsigned int)start;  //  Start Sector Number
    IAP_command[ 2 ]    = (unsigned int)end;    //  End Sector Number (should be greater than or equal to start sector number)

    iap_entry( IAP_command, IAP_result );

    return ( (int)IAP_result[ 0 ] );
}


/** Erase Sector(s)
 *  
 *  @param    start    a Start Sector Number
 *  @param    end      an End Sector Number (should be greater than or equal to start sector number).
 *  @return   error code: CMD_SUCCESS | BUSY | SECTOR_NOT_PREPARED_FOR_WRITE_OPERATION | INVALID_SECTOR
 */

int IAP::erase( int start, int end ) {
    IAP_command[ 0 ]    = IAPCommand_Erase_sector;
    IAP_command[ 1 ]    = (unsigned int)start;  //  Start Sector Number
    IAP_command[ 2 ]    = (unsigned int)end;    //  End Sector Number (should be greater than or equal to start sector number)
    IAP_command[ 3 ]    = cclk_kHz;             //  CPU Clock Frequency (CCLK) in kHz

    iap_entry( IAP_command, IAP_result );

    return ( (int)IAP_result[ 0 ] );
}


/** Prepare sector(s) for write operation
 *  
 *  @param    start    a Start Sector Number
 *  @param    end      an End Sector Number (should be greater than or equal to start sector number).
 *  @return   error code: CMD_SUCCESS | BUSY | INVALID_SECTOR
 */

int IAP::prepare( int start, int end ) {
    IAP_command[ 0 ]    = IAPCommand_Prepare_sector_for_write_operation;
    IAP_command[ 1 ]    = (unsigned int)start;  //  Start Sector Number
    IAP_command[ 2 ]    = (unsigned int)end;    //  End Sector Number (should be greater than or equal to start sector number).
    
    iap_entry( IAP_command, IAP_result );
    
    return ( (int)IAP_result[ 0 ] );
}


/** Copy RAM to Flash
 *  
 *  @param    source_addr    Source RAM address from which data bytes are to be read. This address should be a word boundary.
 *  @param    target_addr    Destination flash address where data bytes are to be written. This address should be a 256 byte boundary.
 *  @param    size           Number of bytes to be written. Should be 256 | 512 | 1024 | 4096.
 *  @return   error code: CMD_SUCCESS | SRC_ADDR_ERROR (Address not a word boundary) | DST_ADDR_ERROR (Address not on correct boundary) | SRC_ADDR_NOT_MAPPED | DST_ADDR_NOT_MAPPED | COUNT_ERROR (Byte count is not 256 | 512 | 1024 | 4096) | SECTOR_NOT_PREPARED_FOR_WRITE_OPERATION | BUSY
 */

int IAP::write( char *source_addr, char *target_addr, int size ) {
    IAP_command[ 0 ]    = IAPCommand_Copy_RAM_to_Flash;
    IAP_command[ 1 ]    = (unsigned int)target_addr;    //  Destination flash address where data bytes are to be written. This address should be a 256 byte boundary.
    IAP_command[ 2 ]    = (unsigned int)source_addr;    //  Source RAM address from which data bytes are to be read. This address should be a word boundary.
    IAP_command[ 3 ]    = size;                         //  Number of bytes to be written. Should be 256 | 512 | 1024 | 4096.
    IAP_command[ 4 ]    = cclk_kHz;                     //  CPU Clock Frequency (CCLK) in kHz.

    iap_entry( IAP_command, IAP_result );

    return ( (int)IAP_result[ 0 ] );
}


/** Compare <address1> <address2> <no of bytes>
 *  
 *  @param    source_addr Starting flash or RAM address of data bytes to be compared. This address should be a word boundary.
 *  @param    target_addr Starting flash or RAM address of data bytes to be compared. This address should be a word boundary.
 *  @param    size         Number of bytes to be compared; should be a multiple of 4.
 *  @return   error code: CMD_SUCCESS | COMPARE_ERROR | COUNT_ERROR (Byte count is not a multiple of 4) | ADDR_ERROR | ADDR_NOT_MAPPED     
 */

int IAP::compare( char *source_addr, char *target_addr, int size ) {
    IAP_command[ 0 ]    = IAPCommand_Compare;
    IAP_command[ 1 ]    = (unsigned int)target_addr;    //  Starting flash or RAM address of data bytes to be compared. This address should be a word boundary.
    IAP_command[ 2 ]    = (unsigned int)source_addr;    //  Starting flash or RAM address of data bytes to be compared. This address should be a word boundary.
    IAP_command[ 3 ]    = size;                         //  Number of bytes to be compared; should be a multiple of 4.

    iap_entry( IAP_command, IAP_result );

    return ( (int)IAP_result[ 0 ] );
}


/** Get user reserved flash start address
 *
 *  @return    start address of user reserved flash memory
 *  @see       reserved_flash_area_size()
 */

char * IAP::reserved_flash_area_start( void )
{
    return ( (char *)USER_FLASH_AREA_START );
}


/** Get user reserved flash size
 *
 *  @return    size of user reserved flash memory
 *  @see       reserved_flash_area_start()
 */

int IAP::reserved_flash_area_size( void )
{
    return ( USER_FLASH_AREA_SIZE );
}