/*****************************************************************************
* crc32.c: Ethernet CRC module file for NXP LPC230x Family Microprocessors
*
* Copyright(C) 2006, NXP Semiconductor
* All rights reserved.
*
* History
* 2006.09.01 ver 1.00 Prelimnary version, first Release
*
******************************************************************************/
#include "LPC23xx.h" /* LPC23xx/24xx definitions */
#include "type.h"
#include "crc32.h"
/******************************************************************************
** Function name: CRC_init
**
** Descriptions: Begin CRC calculation.
**
** parameters: pointer to the CRC area.
** Returned value: None
**
******************************************************************************/
void crc32_init(DWORD *pCRC)
{
*pCRC = 0xffffffff;
}
/******************************************************************************
** Function name: CRC32_add
**
** Descriptions: Calculate CRC value one at a time
**
** parameters: pointer to the CRC area, and passing value to get the CRC
** Returned value: None
**
******************************************************************************/
void crc32_add(DWORD *pCRC, BYTE val8)
{
DWORD i, poly;
DWORD entry;
DWORD crc_in;
DWORD crc_out;
crc_in = *pCRC;
poly = 0xEDB88320L;
entry = (crc_in ^ ((DWORD) val8)) & 0xFF;
for (i = 0; i < 8; i++)
{
if (entry & 1)
entry = (entry >> 1) ^ poly;
else
entry >>= 1;
}
crc_out = ((crc_in>>8) & 0x00FFFFFF) ^ entry;
*pCRC = crc_out;
return;
}
/******************************************************************************
** Function name: CRC32_end
**
** Descriptions: Finish CRC calculation
**
** parameters: pointer to the CRC area.
** Returned value: None
**
******************************************************************************/
void crc32_end(DWORD *pCRC)
{
*pCRC ^= 0xffffffff;
}
/******************************************************************************
** Function name: CRC32_bfr
**
** Descriptions: Get the CRC value based on size of the string.
**
** parameters: Pointer to the string, size of the string.
** Returned value: CRC value
**
******************************************************************************/
DWORD crc32_bfr(void *pBfr, DWORD size)
{
DWORD crc32;
BYTE *pu8;
crc32_init(&crc32);
pu8 = (BYTE *) pBfr;
while (size-- != 0)
{
crc32_add(&crc32, *pu8);
pu8++ ;
}
crc32_end(&crc32);
return ( crc32 );
}
/******************************************************************************
** Function name: do_crc_behav
**
** Descriptions: calculate CRC
**
** parameters: MAC address
** Returned value: CRC value
**
******************************************************************************/
DWORD do_crc_behav( long long Addr )
{
/* state variables */
int crc;
/* declare temporary variables */
int q0, q1, q2, q3;
/* loop variables */
int i, j, d;
/* calculate CRC */
crc = 0xFFFFFFFF;
/* do for each byte */
for (i = 5; i >= 0; i--)
{
d = Addr >> (i * 8);
for (j = 0; j < 2; j++)
{
/* calculate temporary variables */
/* bits: 26,23,22,16,12,11,10,8,7,5,4,2,1,0 */
q3 = (((crc >> 28) ^ (d >> 3)) & 0x00000001) ? 0x04C11DB7 : 0x00000000;
/* bits: 27,24,23,17,13,12,11,9,8,6,5,3,2,1 */
q2 = (((crc >> 29) ^ (d >> 2)) & 0x00000001) ? 0x09823B6E : 0x00000000;
/* bits: 28,25,24,18,14,13,12,10,9,7,6,4,3,2 */
q1 = (((crc >> 30) ^ (d >> 1)) & 0x00000001) ? 0x130476DC : 0x00000000;
/* bits: 29,26,25,19,15,14,13,11,10,8,7,5,4,3 */
q0 = (((crc >> 31) ^ d) & 0x00000001) ? 0x2608EDB8 : 0x00000000;
/* do crc */
crc = (crc /* shift data */
d >>= 4;
}
}
return ( crc );
}
/******************************************************************************
** Function name: Set_HashValue
**
** Descriptions: Set Hash value
**
** parameters: CRC value
** Returned value: None
**
******************************************************************************/
void Set_HashValue( DWORD CrcValue )
{
DWORD HashFilterFlag = 0;
DWORD hashMsb6_1;
DWORD hashIndex1;
hashMsb6_1 = (CrcValue & 0x1f800000);
hashMsb6_1 = ( (hashMsb6_1 >> 23) & 0x3f);
if ( hashMsb6_1 >= 32 )
{
HashFilterFlag = 1;
hashMsb6_1 -= 32;
}
hashIndex1 = 1
if(HashFilterFlag == 1)
{
MAC_HASHFILTERH = hashIndex1;
MAC_HASHFILTERL = 0x0;
}
else
{
MAC_HASHFILTERH = 0x0;
MAC_HASHFILTERL = hashIndex1;
}
/* When the Hash filter is enabled, the PassRxFilter bit in MAC_COMMAND
needs to be enabled too. */
MAC_COMMAND &= ~0x0080;
return;
}
/*********************************************************************************
** End Of File
*********************************************************************************/
