rc500rst.c

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

/*****************************************************************************
*          复位并初始化RC500
*注意:RC500上电后应延时500ms才能可靠初始化
******************************************************************************/
char PcdReset()
{
   char status=MI_OK;
   char n=0;
   uint i=0x4000;
   RC500_CE=0;
   RC500_RST=1;
   DelayMs(100);
   RC500_RST=0;
   while(i!=0&&n!=0x3f)
   {
      n=ReadRawRC(RegCommand);
      i--;
   }
   while(i!=0&&n==0x3f)
   {
      n=ReadRawRC(RegCommand);
      i--;
   }
   if(i!=0)
   {
      WriteRawRC(RegPage,0x80);
      n=0x80;
      while((i!=0)&&(n&0x80))
      {
          n=ReadRawRC(RegCommand);
          i--;
      }
      if(i==0||(n&0xff))
      {
          status=MI_RESETERR;
      }
   }
   else
   {
       status=MI_RESETERR;
   }
   if(status==MI_OK)
   {
     WriteRC(RegClockQControl,0x0);
     WriteRC(RegClockQControl,0x40);
     DelayUs(100);
     ClearBitMask(RegClockQControl,0x40);
     WriteRC(RegBitPhase,0xad);
     WriteRC(RegRxThreshold,0xff);
     WriteRC(RegRxControl2,01);
     WriteRC(RegFIFOLevel,0x1a);
     WriteRC(RegTimerControl,0x02);
     WriteRC(RegIRqPinConfig,0x02);
     WriteRC(RegTxControl,0x5b);
   }
   return status;
}

/*****************************************************************************
*         延时
*****************************************************************************/
void DelayMS(uchar j)
{
   uchar i,n;
   for(i=0;i<j;i++)
   {   for(n=0;n<230;n++);
   }
}
void DelayUs(uchar j)
{
   uchar i,n;
   n=j/5;
   for(i=0;i<n;i++);
}