bl78k0_kx2_help_fkt.c

NEC upd78f0300的自编程序样例

//==============================================================================
// PROJECT      = Bootloader
// MODULE       = bl78k0_kx2_help_fkt.c
// SHORT DESC.  = Help functions
// DEVICE       = 78K0/Kx2
// VERSION      = 1.0
// DATE         = 05.12.2006
// LAST CHANGE  =
// =============================================================================
// By:          NEC Electronics (Europe) GmbH
//              Arcadiastrasse 10
//              D-40472 Duesseldorf
// =============================================================================


#include "bl78k0_kx2_help_fkt.h"



//*****************************************************************************
// extern global variables
//*****************************************************************************
extern __saddr u32 temp_u32;
extern __callt void sendString (u08 *ucpStr);

__saddr u16 crc;



//*****************************************************************************
// Function:    calcCRC
// Parameter:   u08 -> byte for crc calculating
// Return:      void
// Description: Calculate CRC for give byte
//    ATTENTION: The calcCRC must be called with 2 zero bytes after calculation!
//*****************************************************************************
__callt void calcCRC( u08 val)
{
  for (u08 i = 0; i < 8; ++i)
  {
    temp_u32 = crc;
    crc <<= 1;
    if (val & 0x80)
      crc |= 1 ;
    if (temp_u32 & 0x8000)
      crc ^= 0x1021;
    val <<= 1;
   }

}



//*****************************************************************************
// Function:    resetCRC
// Parameter:   none
// Return:      void
// Description: Reset calculated CRC
//*****************************************************************************
__callt void resetCRC(void)
{
  crc = 0;                                        // reset CRC
}

//*****************************************************************************
// Function:    resetCRC
// Parameter:   none
// Return:      void
// Description: Reset calculated CRC
//*****************************************************************************
__callt u16 getCRC(void)
{
  return crc;                                     // return CRC
}


//*****************************************************************************
// Function:    getASCII
// Parameter:   u08, 0000XXXXb
// Return:      void
// Description: Reset calculated CRC
//*****************************************************************************
__callt u08 getASCII(u08 byte_nibble)
{
  if( byte_nibble < 10 )                          // is byte_nibble < 10
  {
    return ( byte_nibble | 0x30 );                // return byte|0x30
  }
  else
  {
    byte_nibble += 1;                             // increment, because A-F
    return ( byte_nibble | 0x40 );                // return byte|0x40
  }

}



//*****************************************************************************
// Function:    rom_Read
// Parameter:   u16 -> address where the content must be read
// Return:      u08 -> content at the give address
// Description: This function read the content of the given address
//*****************************************************************************
__callt u08 rom_Read(u16 ROM_addr)
{
 u08 buffer = 0;
 u08 *ptr1;

 ptr1 = (u08 *) ROM_addr;
 buffer = *ptr1;
 return buffer;
}