/////////////////////////////////////////////////////////////////////
//功 能：通过RC522和ISO14443卡通讯
//参数说明：Command[IN]:RC522命令字
// pIn [IN]:通过RC522发送到卡片的数据
// InLenByte[IN]:发送数据的字节长度
// pOut [OUT]:接收到的卡片返回数据
// *pOutLenBit[OUT]:返回数据的位长度
/////////////////////////////////////////////////////////////////////
char PcdComMF522(u8 Command,
u8 *pIn ,
u8 InLenByte,
u8 *pOut ,
u8 *pOutLenBit)
{
char status = MI_ERR;
u8 irqEn = 0x00;
u8 waitFor = 0x00;
u8 lastBits;
u8 n;
u32 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); //清所有中断位
WriteRawRC(CommandReg,PCD_IDLE);
SetBitMask(FIFOLevelReg,0x80); //清FIFO缓存
for (i=0; i<InLenByte; i++)
{ WriteRawRC(FIFODataReg, pIn [i]); }
WriteRawRC(CommandReg, Command);
// n = ReadRawRC(CommandReg);
if (Command == PCD_TRANSCEIVE)
{ SetBitMask(BitFramingReg,0x80); } //开始传送
//i = 600;//根据时钟频率调整，操作M1卡最大等待时间25ms
i = 10000;
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++)
{ pOut [i] = ReadRawRC(FIFODataReg); }
}
}
else
{ status = MI_ERR; }
}
SetBitMask(ControlReg,0x80); // stop timer now
WriteRawRC(CommandReg,PCD_IDLE);
return status;
}
在这个程序里while ((i!=0) && !(n&0x01) && !(n&waitFor));
(n&waitFor))不是一直为0吗？
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