nand_fdl/fdl-2/src/fdl_common.c

   1 #include "fdl_common.h"
   2
   3 unsigned short fdl_calc_checksum(unsigned char *data, unsigned long len)
   4 {
   5         unsigned short num = 0;
   6         unsigned long chkSum = 0;
   7         while(len>1) {
   8                 num = (unsigned short)(*data);
   9                 data++;
  10                 num |= (((unsigned short)(*data))<<8);
  11                 data++;
  12                 chkSum += (unsigned long)num;
  13                 len -= 2;
  14         }
  15         if(len) {
  16                 chkSum += *data;
  17         }
  18         chkSum = (chkSum >> 16) + (chkSum & 0xffff);
  19         chkSum += (chkSum >> 16);
  20         return (~chkSum);
  21 }
  22
  23 unsigned char fdl_check_crc(uint8* buf, uint32 size,uint32 checksum)
  24 {
  25         uint16 crc;
  26
  27         crc = fdl_calc_checksum(buf,size);
  28         printf("fdl_check_crc  calcout = 0x%x,org = 0x%x\n",crc,checksum);
  29         return (crc == (uint16)checksum);
  30 }