MFRC531和ISO14443卡通讯的代码有些不明白

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RC531, 通讯, iso14443, 代码, TE

本帖最后由 new_year 于 2013-10-14 21:05 编辑

MFRC531和ISO14443卡通讯

MFRC531和ISO14443卡通讯
// input: pi->MfCommand = RC531命令字
//       pi->MfLength  = 发送的数据长度
//       pi->MfData[]  = 发送数据
// output:status       = 错误字
//       pi->MfLength  = 接收的数据BIT长度
//       pi->MfData[]  = 接收数据
signed char MFRC531_ISO14443_Transceive(struct TransceiveBuffer *pi)
{
unsigned char recebyte = 0;
signed char status;
unsigned char irqEn = 0x00;
unsigned char waitFor = 0x00;
unsigned char lastBits;
unsigned char n;
unsigned int i;
switch (pi->MfCommand)
{
   case PCD_IDLE:
      irqEn = 0x00;
      waitFor = 0x00;
      break;
   case PCD_WRITEE2:
      irqEn = 0x11;
      waitFor = 0x10;
      break;
   case PCD_READE2:
      irqEn = 0x07;
      waitFor = 0x04;
      recebyte=1;
      break;
   case PCD_LOADCONFIG:
   case PCD_LOADKEYE2:
   case PCD_AUTHENT1:
      irqEn = 0x05;
      waitFor = 0x04;
      break;
   case PCD_CALCCRC:
      irqEn = 0x11;
      waitFor = 0x10;
      break;
   case PCD_AUTHENT2:
      waitFor = 0x04;
      break;
      irqEn = 0x04;
   case PCD_RECEIVE:
      irqEn = 0x06;
      waitFor = 0x04;
      recebyte=1;
      break;
   case PCD_LOADKEY:
      irqEn = 0x05;
      waitFor = 0x04;
      break;
   case PCD_TRANSMIT:
      irqEn = 0x05;
      waitFor = 0x04;
      break;
   case PCD_TRANSCEIVE: // this one
      irqEn = 0x3D;
      waitFor = 0x04;
      recebyte=1;
      break;
   default:
      pi->MfCommand = MI_UNKNOWN_COMMAND;
      break;
}
if (pi->MfCommand != MI_UNKNOWN_COMMAND)
{
   MFRC531_WriteReg(RegPage1,0x00);
   MFRC531_WriteReg(RegInterruptEn,0x7F);
   MFRC531_WriteReg(RegInterruptRq,0x7F);
   MFRC531_WriteReg(RegCommand,PCD_IDLE);
   MFRC531_SetBitMask(RegControl,0x01);  // Clear FIFO
   MFRC531_WriteReg(RegInterruptEn,irqEn|0x80);

   for (i=0; i<pi->MfLength; i++)
   {
      MFRC531_WriteReg(RegFIFOData, pi->MfData); //将数据写入fifo
   }
   MFRC531_WriteReg(RegCommand, pi->MfCommand);  //将命令写入command
   i = 0x3500;
   do
   {
      n = MFRC531_ReadReg(RegInterruptRq);
      i--;
   }while ((i!=0) && !(n&irqEn&0x20) && !(n&waitFor)); //这个while循环的条件是怎么控制的，什么意思？？？？？？

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MFRC531和ISO14443卡通讯的代码有些不明白

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