pcdanticoll.c

RC500的C库函数

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

char PcdAnticoll(uchar *snr)
{
    uchar i;
    uchar snr_check=0;
    char status=MI_OK;
    idata struct TranSciveBuffer{uchar MfCommand;
                                 uchar MfLength;
                                 uchar MfData[5];
                                }MfComData;
    struct TranSciveBuffer *pi;

    pi=&MfComData;
    PcdSetTmo(106);
    WriteRC(RegDecoderControl,0x28);
    ClearBitMask(RegControl,0x08);
    WriteRC(RegChannelRedundancy,0x03);

    MfComData.MfCommand=PCD_TRANSCEIVE;
    MfComData.MfLength=2;
    MfComData.MfData[0]=PICC_ANTICOLL1;
    MfComData.MfData[1]=0x20;
    status=PcdComTransceive(pi);
    if(!status)
    {
    	 for(i=0;i<4;i++)
         {
             snr_check^=MfComData.MfData[i];
         }
         if(snr_check!=MfComData.MfData[i])
         {
             status=MI_SERNRERR;
         }
         else
         {
             for(i=0;i<4;i++)
             {
             	*(snr+i)=MfComData.MfData[i];
             }
         }

    }
    ClearBitMask(RegDecoderControl,0x20);
    return status;
}