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

char PcdTransfer(uchar addr)
{
    char status;
    idata struct TranSciveBuffer{uchar MfCommand;
                                 uchar MfLength;
                                 uchar MfData[2];
                                }MfComData;
    struct TranSciveBuffer *pi;
    pi=&MfComData;

    PcdSetTmo(4);
    MfComData.MfCommand=PCD_TRANSCEIVE;
    MfComData.MfLength=2;
    MfComData.MfData[0]=PICC_TRANSFER;
    MfComData.MfData[1]=addr;

    status=PcdComTransceive(pi);
    if (status!=MI_NOTAGERR)
    {
        if(MfComData.MfLength!=4)
        {
           status=MI_BITCOUNTERR;
        }
        else
        {
           MfComData.MfData[0]&=0x0f;
           switch(MfComData.MfData[0])
           {
              case 0x00:
                 status=MI_NOTAUTHERR;
                 break;
              case 0x0a:
                 status=MI_OK;
                 break;
              case 0x01:
                 status=MI_VALERR;
                 break;
              default:
                 status=MI_CODEERR;
                 break;
           }
        }
     }
   return status;
}