problem with function

lib.h
char PcdValue(unsigned char dd_mode,unsigned char addr,unsigned char *pValue);

main:
unsigned char mount[4];
status= PcdValue(0xC1,4,mount);

lib.c

/////////////////////////////////////////////////////////////////////
// @ Function: debit and prepaid
// @ Parameter Description: dd_mode [IN]: command word
// 0xC0 = debit
// 0xC1 = recharge
// Addr [IN]: wallet address
// PValue [IN]: 4 bytes Increase (decrease) in value, low in the former
// @ Return: the successful return MI_OK
/////////////////////////////////////////////////////////////////////                
char PcdValue(unsigned char dd_mode,unsigned char addr,unsigned char *pValue)
{
    char status;
    unsigned int  unLen;
    unsigned char i,ucComMF522Buf[MAXRLEN]; 
    
    ucComMF522Buf[0] = dd_mode;
    ucComMF522Buf[1] = addr;
    CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
 
   [COLOR="#FF0000"] status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
[/COLOR]	
	if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
    {   status = MI_ERR;   }
		
    if (status == MI_OK)
    {
        for (i=0; i<16; i++)
        {    ucComMF522Buf[i] = *(pValue+i);   }
        CalulateCRC(ucComMF522Buf,4,&ucComMF522Buf[4]);
        unLen = 0;
        status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,6,ucComMF522Buf,&unLen);
        if (status != MI_ERR)
        {    status = MI_OK;    }
    }
    
    if (status == MI_OK)
    {
        ucComMF522Buf[0] = PICC_TRANSFER;
        ucComMF522Buf[1] = addr;
        CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]); 
   
        status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);

        if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
        {   status = MI_ERR;   }
    }
    return status;
}

/////////////////////////////////////////////////////////////////////
//@ Function: RC522 and ISO14443 card through communication
//@ Parameter Description: Command [IN]: RC522 command word
//PIn [IN]: data is sent to the card by RC522
//InLenByte [IN]: send data byte length
//POut [OUT]: return data received cards
//* POutLenBit [OUT]: Returns the data bit length
/////////////////////////////////////////////////////////////////////
char PcdComMF522(unsigned char Command, 
                 unsigned char *pInData, 
                 unsigned char InLenByte,
                 unsigned char *pOutData, 
                 unsigned int  *pOutLenBit)
{
    char status = MI_ERR;
    unsigned char irqEn   = 0x00;
    unsigned char waitFor = 0x00;
    unsigned char lastBits;
    unsigned char n;
    unsigned int i;
    switch (Command)
    {
       case PCD_AUTHENT:
          irqEn   = 0x12;
          waitFor = 0x10;
          break;
       case PCD_TRANSCEIVE:
          irqEn   = 0x77;
          waitFor = 0x30;
          break;
       default:
         break;
    }
   
    WriteRawRC(ComIEnReg,irqEn|0x80);
    ClearBitMask(ComIrqReg,0x80);
    WriteRawRC(CommandReg,PCD_IDLE);
    SetBitMask(FIFOLevelReg,0x80);
    WriteRawRC(CommandReg, PCD_IDLE);
    for (i=0; i<InLenByte; i++)
        { 
           WriteRawRC(FIFODataReg, pInData[i]); 
        }
    WriteRawRC(CommandReg, Command);
    if (Command == PCD_TRANSCEIVE)  {    SetBitMask(BitFramingReg,0x80);  }
    i = 2000 ; //600;//????????,??M1???????25ms
    do 
      {
         n = ReadRawRC(ComIrqReg);
         i--;
       }
    while ((i!=0) && !(n&0x01) && !(n&waitFor));
    ClearBitMask(BitFramingReg,0x80);
	      
    if (i!=0)
    {    
         if(!(ReadRawRC(ErrorReg)&0x1B))
         {
             status = MI_OK;
             if (n & irqEn & 0x01) {status = MI_NOTAGERR;}
             if (Command == PCD_TRANSCEIVE)
                 {
               	 n = ReadRawRC(FIFOLevelReg);
              	 lastBits = ReadRawRC(ControlReg) & 0x07;
                 if (lastBits)   {   *pOutLenBit = (n-1)*8 + lastBits;   }
                 else            {   *pOutLenBit = n*8;   }
                 if (n == 0)     {   n = 1;    }
                 if (n > MAXRLEN){   n = MAXRLEN;   }
                 for (i=0; i<n; i++)
                    {
                       pOutData[i] = ReadRawRC(FIFODataReg);
                    }
                 }
         }
         else
         {   status = MI_ERR;   }
        
   }
   SetBitMask(ControlReg,0x80);           // stop timer now
   WriteRawRC(CommandReg,PCD_IDLE); 
   return status;
}