RC522读卡芯片怎么用？

什么意思？#include
#define RST 1 << 8 // P0.7控制RC522复位，低电平复位/*
*********************************************************************************************************
** 函数名称 ：RC522_RST()
** 函数功能 ：复位RC522
** 调试说明 ：需将跳线JP5和RST连接。
*********************************************************************************************************
*/int RC522_RST (void)
{ //PINSEL0 = 0x00000000; // 设置管脚连接GPIO
IO0DIR = RST; // 设置RST控制口为输出
IO0SET = RST; // P0.7置高
DelayNS(10); // 延时
IO0CLR = RST; // P0.7置低
DelayNS(3);
IO0SET = RST;

return 0;
}/*
********************************************************************************************************
** 函数名称：ReadRawRC()
** 函数功能：读MF522寄存器
** 参数说明：Address[IN]：寄存器地址
** 返 回 值：读出的值
********************************************************************************************************
*/unsigned char ReadRawRC(unsigned char Address)
{
unsigned char ucAddr;
unsigned char ucResult = 0;
ucAddr = ((Address<<1)&0x7E)|0x80;

ucResult = MSPI_SendData (ucAddr);

return ucResult;

}
/*
*******************************************************************************************************
** 函数名称：WriteRawRC()
** 函数功能：写MF522寄存器
** 参数说明：Address[IN]：寄存器地址
** value[IN]：写入的值
** 返 回 值：无
*******************************************************************************************************
*/void WriteRawRC(unsigned char Address,unsigned char value)
{
unsigned char ucAddr;
ucAddr = ((Address<<1)&0x7E);

MSPI_SendData(ucAddr);
MSPI_SendData(value);

return 0;}/*
*******************************************************************************************************
** 函数名称：SetBitMask()
** 函数功能：置MF522寄存器位
** 参数说明：reg[IN]：寄存器地址
** mask[IN]：置位值
** 返 回 值：无
*******************************************************************************************************
*/void SetBitMask(unsigned char reg,unsigned char mask)
{
char tmp = 0x0;
tmp = ReadRawRC(reg);
WriteRawRC(reg,tmp | mask);
return 0;
}/*
*******************************************************************************************************
** 函数名称：ClearBitMask()
** 函数功能：清MF522寄存器位
** 参数说明：reg[IN]：寄存器地址
** mask[IN]：清位值
** 返 回 值：无
*******************************************************************************************************
*/void ClearBitMask(unsigned char reg,unsigned char mask)
{
char tmp = 0x0;
tmp ReadRawRC(reg);
WriteRawRC(reg,tmp & ~mask);
return 0;
}/*
*******************************************************************************************************
** 函数名称：PcdAntennaOn()
** 函数功能：开启天线
** 函数说明：每次开启或关闭天线发射之间至少有1ms的间隔
** 返 回 值：无
*******************************************************************************************************
*/void PcdAntennaOn()
{
unsigned char i;
i = ReadRawRC(TxControlReg);
if (!(i & 0x03))
{
SetBitMask(TxControlReg,0x03);

}return 0;
}/*
*******************************************************************************************************
** 函数名称：PcdAntennaOff()
** 函数功能：关闭天线
** 函数说明：每次开启或关闭天线发射之间至少有1ms的间隔
** 返 回 值：无
*******************************************************************************************************
*/void PcdAntennaOff()
{
ClearBitMask(TxControlReg,0x03);

}/*
*******************************************************************************************************
** 函数名称：PcdComMF522()
** 函数功能：通过RC522和ISO14443卡通讯
** 函数说明：Command[IN]：RC522命令字
** pIndata[IN]：通过RC522发送到卡片的数据
** InLenByte[IN]：发送数据的字节长度
** pOutData[OUT]：接收到的卡片返回数据
** *pOutLenBit[OUT]：返回数据的位长度
** 返 回 值：成功返回 MI_OK
*******************************************************************************************************
*/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);

for (i=0; i { WriteRawRC(FIFODataReg, pInData[i]); }
WriteRawRC(CommandReg, Command);

if (Command == PCD_TRANSCEIVE)
{ SetBitMask(BitFramingReg,0x80); }

i = 600;//根据时钟频率调整，操作M1卡最大等待时间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 { pOutData[i] = ReadRawRC(FIFODataReg); }
}
}
else
{ status = MI_ERR; }

}
SetBitMask(ControlReg,0x80); // stop timer now
WriteRawRC(CommandReg,PCD_IDLE);
return status;
}2007-8-11 22:33:00 jianjian1981
等级：初中二年级
文章：51
积分：1461
门派：无门无派
注册：2006年4月19日第 2 楼 --------------------------------------------------------------------------------
/*
*******************************************************************************************************
** 函数名称：PcdRequest()
** 函数功能：寻卡
** 函数说明：req_code[IN]:寻卡方式
** 0x52 = 寻感应区内所有符合14443A标准的卡
** 0x26 = 寻未进入休眠状态的卡
** pTagType[OUT]：卡片类型代码
** 0x4400 = Mifare_UltraLight
** 0x0400 = Mifare_One(S50)
** 0x0200 = Mifare_One(S70)
** 0x0800 = Mifare_Pro(X)
** 0x4403 = Mifare_DESFire
** 返 回 值：成功返回MI_OK
*******************************************************************************************************
*/char PcdRequest(unsigned char req_code,unsigned char *pTagType)
{
char status;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN]; ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x07);
SetBitMask(TxControlReg,0x03);

ucComMF522Buf[0] = req_code; status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,1,ucComMF522Buf,&unLen);

if ((status == MI_OK) && (unLen == 0x10))
{
*pTagType = ucComMF522Buf[0];
*(pTagType+1) = ucComMF522Buf[1];
}
else
{ status = MI_ERR; }

return status;
}/*
*******************************************************************************************************
** 函数名称：PcdAnticoll()
** 函数功能：防冲撞
** 函数说明：pSnr[OUT]:卡片序列号，4字节
** 返 回 值：成功返回MI_OK
*******************************************************************************************************
*/char PcdAnticoll(unsigned char *pSnr)
{
char status;
unsigned char i,snr_check=0;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x00);
ClearBitMask(CollReg,0x80);

ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x20; status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,2,ucComMF522Buf,&unLen); if (status == MI_OK)
{
for (i=0; i<4; i++)
{
*(pSnr+i) = ucComMF522Buf[i];
snr_check ^= ucComMF522Buf[i];
}
if (snr_check != ucComMF522Buf[i])
{ status = MI_ERR; }
}

SetBitMask(CollReg,0x80);
return status;
}/*
*******************************************************************************************************
** 函数名称：PcdSelect()
** 函数功能：选定卡片
** 函数说明：pSnr[IN]:卡片序列号，4字节
** 返 回 值：成功返回MI_OK
*******************************************************************************************************
*/char PcdSelect(unsigned char *pSnr)
{
char status;
unsigned char i;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];

ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x70;
ucComMF522Buf[6] = 0;
for (i=0; i<4; i++)
{
ucComMF522Buf[i+2] = *(pSnr+i);
ucComMF522Buf[6] ^= *(pSnr+i);
}
CalulateCRC(ucComMF522Buf,7,&ucComMF522Buf[7]);

ClearBitMask(Status2Reg,0x08); status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,9,ucComMF522Buf,&unLen);

if ((status == MI_OK) && (unLen == 0x18))
{ status = MI_OK; }
else
{ status = MI_ERR; } return status;
}