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通过各位大神的指点，经过自己的理解，程序是写出来了，但是烧录到单片机刷卡会死机，注册过的卡就可以正常读取，不知道问题出在哪里，请路过的大神一起分析一下，不知道是不是读取、保存、验证的方法错了
void checkcard(void) //校验卡
{
uchar j;
uchar IDAddress;
for(idnum=0;idnum<255;idnum=idnum+4)
{
IDAddress= numaddress[idnum]; // numaddress是4位数的SN号
if(0!=At24c02Read(IDAddress))
for(j=0;j<4;j++)
{
IDn[j]= At24c02Read(IDAddress);
delayms(20);
IDAddress++;
}
if( (Card_SN[0]==IDn[0])&&(Card_SN[1]==IDn[1])&&(Card_SN[2]==IDn[2])&&(Card_SN[3]==IDn[3]) )
break;
}
if( (idnum<255)&&(Card_SN[0]==IDn[0])&&(Card_SN[1]==IDn[1])&&(Card_SN[2]==IDn[2])&&(Card_SN[3]==IDn[3]) )
flag_id=1;
else flag_id=0;
}
if(Key==0x11) //注册卡
{
IC_READ();
if(IC_READ()==1)
{
checkcard();
if(flag_id==1)
{
flag_id=0;
LcmClearTXT();
PutStr(0,2,"卡已注册");
PutStr(1,2,"请换卡片");
PutStr(2,1,"按任意键继续");
while(Keycan()==0);
LcmClearTXT();
PutStr(0,2,"请刷卡");
}
else
{
for(i=0;i<255;i=i+4)
{
temp1=numaddress[ i];
if(0==At24c02Read(temp1))
for(j=0;j<4;j++)
{
At24c02Write(temp1,Card_SN[j]);
delayms(50);
temp1++;
}
break;
}
LcmClearTXT();
beep();
PutStr(0,2,"注册成功");
PutStr(1,1,"按任意键继续");
while(Keycan()==0);
LcmClearTXT();
PutStr(0,2,"请刷卡");
}
}
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