pcdselect.c

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#include <reg52.h>
#include "rc500.h"

char PcdSelect(uchar *snr)
{
    uchar i;
    char status;
    uchar snr_check=0;
    idata struct TranSciveBuffer{uchar MfCommand;
                                 uchar MfLength;
                                 uchar MfData[7];
                                }MfComData;
    struct TranSciveBuffer *pi;

    pi=&MfComData;
    PcdSetTmo(106);
    WriteRC(RegChannelRedundancy,0x0F);
    ClearBitMask(RegControl,0x08);

    MfComData.MfCommand=PCD_TRANSCEIVE;
    MfComData.MfLength=7;
    MfComData.MfData[0]=PICC_ANTICOLL1;
    MfComData.MfData[1]=0x70;
    for(i=0;i<4;i++)
    {
    	snr_check^=*(snr+i);
    	MfComData.MfData[i+2]=*(snr+i);
    }
    MfComData.MfData[6]=snr_check;
    status=PcdComTransceive(pi);
    if(status==MI_OK)
    {    if(MfComData.MfLength!=0x8)
        {
         status = MI_BITCOUNTERR;
        }
   }
   return status;
}