BMS_Slave/ProjectSource/BMS_Slave_RCT/SSL_FLASH_CRC.c

/**********************************************************************
* © 2010 Microchip Technology Inc.
*
* FileName:        	SSL_EEPROMTest_CRC16.c
* Dependencies:         Header (.h) files if applicable, see below
* Processor:       	PIC18
* Compiler:        	C18 v3.41
*
* SOFTWARE LICENSE AGREEMENT:
* Microchip Technology Inc. (“Microchip”) licenses this software to you
* solely for use with Microchip PIC® microcontroller
* products. The software is owned by Microchip and is protected under
* applicable copyright laws.  All rights reserved.
*
* SOFTWARE IS PROVIDED “AS IS.”  MICROCHIP EXPRESSLY DISCLAIMS ANY
* WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL MICROCHIP
* BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR CONSEQUENTIAL
* DAMAGES, LOST PROFITS OR LOST DATA, HARM TO YOUR EQUIPMENT, COST OF
* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF),
* ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER SIMILAR COSTS.
*
* REVISION HISTORY:
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Author           	Date      		Comments on this revision
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* CT		      	09/15/2008		Initial Revision
* Mike Cahill		11/11/10		Updated for HI-TECH v9.80
* MVL			02/22/2011		Updated with HI-TECH v9.81
* VR                    07/11/2012              Downgrade to C18 v3.41
*
* Version 		1.03
*
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* ADDITIONAL NOTES:
*
**********************************************************************/

#include "SSL_FLASH_CRC.h"


uint16_t           crc_Result = 0;
uint16_t           partialCRC_Result = 0;
uint16_t           tempCRC = 0;
uint8_t            Buffer;
uint8_t rom       *data_F = 0;

uint16_t volatile  startAddress = FLASH_STARTADDRESS;
uint16_t volatile  endAddress   = FLASH_ENDADDRESS;



/*******************************************************************************
* Description:
*     The " SSL_8bits_EEPROMtest_CRC16 " function Calculates
*     the CRC of the data starting fromnAddress
*     "EEPROM_STARTADDRESS" to "EEPROM_ENDADDRESS". This function
*     \returns the final CRC Value.
*     CRC-16 is used as a divisor.
*     
*     CRC-16 = 1 1000 0000 0000 0101= 8005(hex)
* Input:  startAddress :  start Address from which the CRC needs to be calculated
*         endAddress :    This address indicates the Final address upto which the CRC is calculated
* Return Values:
          crc_Result :  	Returns the final CRC result.
*                                                                  
*******************************************************************************/
uint16_t  SSL_FLASHtest_CRC( void )
{
    uint16_t  i;


    for(i=startAddress; i<endAddress ; i++)
    {
        partialCRC_Result=0;
        Buffer = *(data_F+i);
        //Buffer=Read_b_eep(i);
        FLASH_CRC_Checksum();
        crc_Result= crc_Result + partialCRC_Result;
    }
    return crc_Result;
}



/*******************************************************************************
  * Description  : Calculates the Partial Checksum for FLASH_BYTES
  *****************************************************************************/
void FLASH_CRC_Checksum()
{  
    uint16_t  i;

    tempCRC=0;
		    
    for(i=8u; i>0u; i--)
    {
        if ( (Buffer ^ (tempCRC)) & 0x80 )
        {
            (tempCRC) = ((tempCRC)<< 1) ^ EEPROM_GEN_POLY ;
        }
        else
        {
            (tempCRC) <<= 1 ;
        }
        Buffer <<= 1 ;
    }
    partialCRC_Result= partialCRC_Result+tempCRC;
}