Keyestudio KS0077, Manual, Page: 138 / 142

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if (status == MI_OK)
{
// verify card sequence number
for (i=0; i<4; i++)
{
serNumCheck ^= serNum[i];
}
if (serNumCheck != serNum[i])
{
status = MI_ERR;
}
}
//SetBitMask(CollReg, 0x80); //ValuesAfterColl=1
return status;
}
void CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData)
{
uchar i, n;
ClearBitMask(DivIrqReg, 0x04); //CRCIrq = 0
SetBitMask(FIFOLevelReg, 0x80); // clear FIFO pointer
//Write_MFRC522(CommandReg, PCD_IDLE);
// write data into FIFO
for (i=0; i<len; i++)
{
Write_MFRC522(FIFODataReg, *(i));
}
Write_MFRC522(CommandReg, PCD_CALCCRC);
// wait for the completion of CRC calculation
i = 0xFF;
do
{
n = Read_MFRC522(DivIrqReg);
i--;
}
while ((i!=0) && !(n&0x04));
//CRCIrq = 1