Ich habe jetzt mal das nachgeschrieben:
Timer0 läuft mit 125Khz
//Global
unsigned char tag[5];
static unsigned char data[8];
static volatile char flag;
// External Interrupt 1 service routine
interrupt [EXT_INT1] void ext_int1_isr(void)
{
static unsigned int sync;
static unsigned int bitcount;
static unsigned int insync = 0;
static unsigned int old_cnt;
if (TCNT0 - old_cnt > MANCHESTER_MIDDLE)
{
old_cnt = TCNT0;
sync <<= 1;
bitcount++;
if (!rfid_out)
sync |= 1;
if ((sync & 0x3FF) == 0x1FF)
{
data[0] = 0xFF;
bitcount = 1;
insync = 1;
}
if (insync)
{
if ((bitcount % 8) == 0)
{
data[bitcount / 8] = sync & 0xFF;
if (bitcount == 56)
{
flag = 1;
insync = 0;
GIMSK &= ~(1<<INT1);
}
}
}
}
}
///////////////////////////////////////////////////////////////
unsigned char em4095_read_tag(unsigned char *d)
{
unsigned char timeout = 50;
unsigned char temp[8];
unsigned char i;
do
{
if (TIFR)
{
timeout--;
TIFR |= 1<<TOV0; //Clear Overflow Flag
}
} while ((!flag) && (timeout > 0));
if (!flag)
return 0;
flag = 0;
for (i=0;i!=8;i++)
{temp[i]=data[i];}
memcpy(temp, data, 8);
memset(data, 0, 8);
GIMSK |= 1<<INT1;
if (((temp[0] << 8 | temp[1]) & 0xFF80) != 0xFF80) //Check startbits
return 0;
if ((temp[7] & 0x01)) //Check stopbit
return 0;
if (!check_parity(temp[1] & 0x7C))
return 0;
if (!check_parity((temp[1] & 0x03) | (temp[2] & 0xE0)))
return 0;
if (!check_parity(temp[2] & 0x1F))
return 0;
if (!check_parity(temp[3] & 0xF8))
return 0;
if (!check_parity((temp[3] & 0x07) | (temp[4] & 0xC0)))
return 0;
if (!check_parity(temp[4] & 0x3E))
return 0;
if (!check_parity((temp[4] & 0x01) | (temp[5] & 0xF0)))
return 0;
if (!check_parity((temp[5] & 0x0F) | (temp[6] & 0x80)))
return 0;
if (!check_parity(temp[6] & 0x7C))
return 0;
if (!check_parity((temp[6] & 0x03) | (temp[7] & 0xE0)))
return 0;
if (!check_parity((temp[1] & 0x40) ^ (temp[1] & 0x02) ^ (temp[2] &
0x10) ^ (temp[3] & 0x80) ^ (temp[3] & 0x04) ^
(temp[4] & 0x20) ^ (temp[4] & 0x01) ^ (temp[5] &
0x08) ^ (temp[6] & 0x40) ^ (temp[6] & 0x02) ^
(temp[7] & 0x10)))
return 0;
if (!check_parity((temp[1] & 0x20) ^ (temp[1] & 0x01) ^ (temp[2] &
0x08) ^ (temp[3] & 0x40) ^ (temp[3] & 0x02) ^
(temp[4] & 0x10) ^ (temp[5] & 0x80) ^ (temp[5] &
0x04) ^ (temp[6] & 0x20) ^ (temp[6] & 0x01) ^
(temp[7] & 0x08)))
return 0;
if (!check_parity((temp[1] & 0x10) ^ (temp[2] & 0x80) ^ (temp[2] &
0x04) ^ (temp[3] & 0x20) ^ (temp[3] & 0x01) ^
(temp[4] & 0x08) ^ (temp[5] & 0x40) ^ (temp[5] &
0x02) ^ (temp[6] & 0x10) ^ (temp[7] & 0x80) ^
(temp[7] & 0x04)))
return 0;
if (!check_parity((temp[1] & 0x08) ^ (temp[2] & 0x40) ^ (temp[2] &
0x02) ^ (temp[3] & 0x10) ^ (temp[4] & 0x80) ^
(temp[4] & 0x04) ^ (temp[5] & 0x20) ^ (temp[5] &
0x01) ^ (temp[6] & 0x08) ^ (temp[7] & 0x40) ^
(temp[7] & 0x02)))
return 0;
//11111111 11000110 00101111 10001100 01010011 00010000 00100101
00110110
// DDDD DD DD DDDD DDDD DDD D DDDD D DDD DDDD DDDD DD DD DDDD
// 0000 00 00 1111 1111 222 2 2222 3 333 3333 4444 44 44
d[0] = (temp[1] & 0x78) << 1 | (temp[1] & 0x03) << 2 | (temp[2] &
0xC0) >> 6;
d[1] = (temp[2] & 0x1E) << 3 | (temp[3] & 0xF0) >> 4;
d[2] = (temp[3] & 0x07) << 5 | (temp[4] & 0x80) >> 3 | (temp[4] &
0x3C) >> 2;
d[3] = (temp[4] & 0x01) << 7 | (temp[5] & 0xE0) >> 1 | (temp[5] &
0x0F);
d[4] = (temp[6] & 0x78) << 1 | (temp[6] & 0x03) << 2 | (temp[7] &
0xC0) >> 6;
return 1;
}
///////////////////////////////////////////////////////////////
static unsigned char check_parity(unsigned char param)
{
unsigned char bitl;
unsigned char par = 0;
for (bitl=0; bitl<16; bitl++)
par ^= (param >> bitl) & 0x01;
if (par)
return 0;
else
return 1;
}
///////////////////////////////////////////////////////////////
//main
if (em4095_read_tag(tag))
{
isp_mosi=1;
putchar(tag[0]);
putchar(tag[1]);
putchar(tag[2]);
putchar(tag[3]);
putchar(tag[4]);
isp_mosi=0;
printf("\r\n");
delay_ms(1000);
}
Aber egal was ich mache es kommt immer nur 0,0,0,0,0
muss ich etwas ändern wenn ich den U2270b nehme die Soft ist für
em4095??
Bitte um HILFE!
