git.zerfleddert.de Git - proxmark3-svn/blobdiff

diff --git a/armsrc/lfops.c b/armsrc/lfops.c

index 9fe60de81cbd7ec02bcf49f2584ff8d14c3c4d2a..76c4b44e7f1090c5193ceefdb2ae5ea269db407c 100644 (file)

--- a/armsrc/lfops.c

+++ b/armsrc/lfops.c

@@ -1,654 +1,2076 @@

-//-----------------------------------------------------------------------------\r

-// Miscellaneous routines for low frequency tag operations.\r

-// Tags supported here so far are Texas Instruments (TI), HID\r

-// Also routines for raw mode reading/simulating of LF waveform\r

-//\r

-//-----------------------------------------------------------------------------\r

-#include <proxmark3.h>\r

-#include "apps.h"\r

-#include "../common/crc16.c"\r

-\r

-void AcquireRawAdcSamples125k(BOOL at134khz)\r

-{\r

- if(at134khz) {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- } else {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- }\r

-\r

- // Connect the A/D to the peak-detected low-frequency path.\r

- SetAdcMuxFor(GPIO_MUXSEL_LOPKD);\r

-\r

- // Give it a bit of time for the resonant antenna to settle.\r

- SpinDelay(50);\r

-\r

- // Now set up the SSC to get the ADC samples that are now streaming at us.\r

- FpgaSetupSsc();\r

-\r

- // Now call the acquisition routine\r

- DoAcquisition125k(at134khz);\r

-}\r

-\r

-// split into two routines so we can avoid timing issues after sending commands //\r

-void DoAcquisition125k(BOOL at134khz)\r

-{\r

- BYTE *dest = (BYTE *)BigBuf;\r

- int n = sizeof(BigBuf);\r

- int i;\r

-\r

- memset(dest,0,n);\r

- i = 0;\r

- for(;;) {\r

- if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r

- SSC_TRANSMIT_HOLDING = 0x43;\r

- LED_D_ON();\r

- }\r

- if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r

- dest[i] = (BYTE)SSC_RECEIVE_HOLDING;\r

- i++;\r

- LED_D_OFF();\r

- if(i >= n) {\r

- break;\r

- }\r

- DbpIntegers(dest[0], dest[1], at134khz);\r

-}\r

-\r

-void ModThenAcquireRawAdcSamples125k(int delay_off,int period_0,int period_1,BYTE *command)\r

-{\r

- BOOL at134khz;\r

-\r

- // see if 'h' was specified\r

- if(command[strlen((char *) command) - 1] == 'h')\r

- at134khz= TRUE;\r

- else\r

- at134khz= FALSE;\r

-\r

- if(at134khz) {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- } else {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- }\r

-\r

- // Give it a bit of time for the resonant antenna to settle.\r

- SpinDelay(50);\r

-\r

- // Now set up the SSC to get the ADC samples that are now streaming at us.\r

- FpgaSetupSsc();\r

-\r

- // now modulate the reader field\r

- while(*command != '\0' && *command != ' ')\r

- {\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r

- LED_D_OFF();\r

- SpinDelayUs(delay_off);\r

- if(at134khz) {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- } else {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- }\r

- LED_D_ON();\r

- if(*(command++) == '0')\r

- SpinDelayUs(period_0);\r

- else\r

- SpinDelayUs(period_1);\r

- }\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r

- LED_D_OFF();\r

- SpinDelayUs(delay_off);\r

- if(at134khz) {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- } else {\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

- }\r

-\r

- // now do the read\r

- DoAcquisition125k(at134khz);\r

-}\r

-\r

-void AcquireTiType(void)\r

-{\r

- int i;\r

- // tag transmission is <20ms, sampling at 2M gives us 40K samples max\r

- // each sample is 1 bit stuffed into a DWORD so we need 1250 DWORDS\r

- int n = 1250;\r

-\r

- // clear buffer\r

- memset(BigBuf,0,sizeof(BigBuf));\r

-\r

- // Set up the synchronous serial port\r

- PIO_DISABLE = (1<<GPIO_SSC_DIN);\r

- PIO_PERIPHERAL_A_SEL = (1<<GPIO_SSC_DIN);\r

-\r

- // steal this pin from the SSP and use it to control the modulation\r

- PIO_ENABLE = (1<<GPIO_SSC_DOUT);\r

- PIO_OUTPUT_ENABLE = (1<<GPIO_SSC_DOUT);\r

-\r

- SSC_CONTROL = SSC_CONTROL_RESET;\r

- SSC_CONTROL = SSC_CONTROL_RX_ENABLE | SSC_CONTROL_TX_ENABLE;\r

-\r

- // Sample at 2 Mbit/s, so TI tags are 16.2 vs. 14.9 clocks long\r

- // 48/2 = 24 MHz clock must be divided by 12\r

- SSC_CLOCK_DIVISOR = 12;\r

-\r

- SSC_RECEIVE_CLOCK_MODE = SSC_CLOCK_MODE_SELECT(0);\r

- SSC_RECEIVE_FRAME_MODE = SSC_FRAME_MODE_BITS_IN_WORD(32) | SSC_FRAME_MODE_MSB_FIRST;\r

- SSC_TRANSMIT_CLOCK_MODE = 0;\r

- SSC_TRANSMIT_FRAME_MODE = 0;\r

-\r

- LED_D_ON();\r

-\r

- // modulate antenna\r

- PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);\r

-\r

- // Charge TI tag for 50ms.\r

- SpinDelay(50);\r

-\r

- // stop modulating antenna and listen\r

- PIO_OUTPUT_DATA_CLEAR = (1<<GPIO_SSC_DOUT);\r

-\r

- LED_D_OFF();\r

-\r

- i = 0;\r

- for(;;) {\r

- if(SSC_STATUS & SSC_STATUS_RX_READY) {\r

- BigBuf[i] = SSC_RECEIVE_HOLDING; // store 32 bit values in buffer\r

- i++; if(i >= n) return;\r

- }\r

- WDT_HIT();\r

- }\r

-\r

- // return stolen pin to SSP\r

- PIO_DISABLE = (1<<GPIO_SSC_DOUT);\r

- PIO_PERIPHERAL_A_SEL = (1<<GPIO_SSC_DIN) | (1<<GPIO_SSC_DOUT);\r

-}\r

-\r

-void ReadTItag()\r

-{\r

-}\r

-\r

-void WriteTIbyte(BYTE b)\r

-{\r

- int i = 0;\r

-\r

- // modulate 8 bits out to the antenna\r

- for (i=0; i<8; i++)\r

- {\r

- if (b&(1<<i)) {\r

- // stop modulating antenna\r

- PIO_OUTPUT_DATA_CLEAR = (1<<GPIO_SSC_DOUT);\r

- SpinDelayUs(1000);\r

- // modulate antenna\r

- PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);\r

- SpinDelayUs(1000);\r

- } else {\r

- // stop modulating antenna\r

- PIO_OUTPUT_DATA_CLEAR = (1<<GPIO_SSC_DOUT);\r

- SpinDelayUs(300);\r

- // modulate antenna\r

- PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);\r

- SpinDelayUs(1700);\r

- }\r

-}\r

-\r

-void AcquireRawBitsTI(void)\r

-{\r

- // TI tags charge at 134.2Khz\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

-\r

- // Place FPGA in passthrough mode, in this mode the CROSS_LO line\r

- // connects to SSP_DIN and the SSP_DOUT logic level controls\r

- // whether we're modulating the antenna (high)\r

- // or listening to the antenna (low)\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);\r

-\r

- // get TI tag data into the buffer\r

- AcquireTiType();\r

-\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r

-}\r

-\r

-// this is a dummy function to get around\r

-// a possible flash bug in the bootloader\r

-// delete once you've added more code.\r

-void DummyDummyDummy(void)\r

-{\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);\r

- AcquireTiType();\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r

-}\r

-\r

-// arguments: 64bit data split into 32bit idhi:idlo and optional 16bit crc\r

-// if crc provided, it will be written with the data verbatim (even if bogus)\r

-// if not provided a valid crc will be computed from the data and written.\r

-void WriteTItag(DWORD idhi, DWORD idlo, WORD crc)\r

-{\r

-\r

- // WARNING the order of the bytes in which we calc crc below needs checking\r

- // i'm 99% sure the crc algorithm is correct, but it may need to eat the\r

- // bytes in reverse or something\r

-\r

- if(crc == 0) {\r

- crc = update_crc16(crc, (idlo)&0xff);\r

- crc = update_crc16(crc, (idlo>>8)&0xff);\r

- crc = update_crc16(crc, (idlo>>16)&0xff);\r

- crc = update_crc16(crc, (idlo>>24)&0xff);\r

- crc = update_crc16(crc, (idhi)&0xff);\r

- crc = update_crc16(crc, (idhi>>8)&0xff);\r

- crc = update_crc16(crc, (idhi>>16)&0xff);\r

- crc = update_crc16(crc, (idhi>>24)&0xff);\r

- }\r

- DbpString("Writing the following data to tag:");\r

- DbpIntegers(idhi, idlo, crc);\r

-\r

- // TI tags charge at 134.2Khz\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz\r

- // Place FPGA in passthrough mode, in this mode the CROSS_LO line\r

- // connects to SSP_DIN and the SSP_DOUT logic level controls\r

- // whether we're modulating the antenna (high)\r

- // or listening to the antenna (low)\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);\r

- LED_A_ON();\r

-\r

- // steal this pin from the SSP and use it to control the modulation\r

- PIO_ENABLE = (1<<GPIO_SSC_DOUT);\r

- PIO_OUTPUT_ENABLE = (1<<GPIO_SSC_DOUT);\r

-\r

- // writing algorithm:\r

- // a high bit consists of a field off for 1ms and field on for 1ms\r

- // a low bit consists of a field off for 0.3ms and field on for 1.7ms\r

- // initiate a charge time of 50ms (field on) then immediately start writing bits\r

- // start by writing 0xBB (keyword) and 0xEB (password)\r

- // then write 80 bits of data (or 64 bit data + 16 bit crc if you prefer)\r

- // finally end with 0x0300 (write frame)\r

- // all data is sent lsb firts\r

- // finish with 15ms programming time\r

-\r

- // modulate antenna\r

- PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);\r

- SpinDelay(50); // charge time\r

-\r

- WriteTIbyte(0xbb); // keyword\r

- WriteTIbyte(0xeb); // password\r

- WriteTIbyte( (idlo )&0xff );\r

- WriteTIbyte( (idlo>>8 )&0xff );\r

- WriteTIbyte( (idlo>>16)&0xff );\r

- WriteTIbyte( (idlo>>24)&0xff );\r

- WriteTIbyte( (idhi )&0xff );\r

- WriteTIbyte( (idhi>>8 )&0xff );\r

- WriteTIbyte( (idhi>>16)&0xff );\r

- WriteTIbyte( (idhi>>24)&0xff ); // data hi to lo\r

- WriteTIbyte( (crc )&0xff ); // crc lo\r

- WriteTIbyte( (crc>>8 )&0xff ); // crc hi\r

- WriteTIbyte(0x00); // write frame lo\r

- WriteTIbyte(0x03); // write frame hi\r

- PIO_OUTPUT_DATA_SET = (1<<GPIO_SSC_DOUT);\r

- SpinDelay(50); // programming time\r

-\r

- LED_A_OFF();\r

-\r

- // get TI tag data into the buffer\r

- AcquireTiType();\r

-\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);\r

- DbpString("Now use tibits and tidemod");\r

-}\r

-\r

-void SimulateTagLowFrequency(int period, int ledcontrol)\r

-{\r

- int i;\r

- BYTE *tab = (BYTE *)BigBuf;\r

-\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_SIMULATOR);\r

-\r

- PIO_ENABLE = (1 << GPIO_SSC_DOUT) | (1 << GPIO_SSC_CLK);\r

-\r

- PIO_OUTPUT_ENABLE = (1 << GPIO_SSC_DOUT);\r

- PIO_OUTPUT_DISABLE = (1 << GPIO_SSC_CLK);\r

-\r

-#define SHORT_COIL() LOW(GPIO_SSC_DOUT)\r

-#define OPEN_COIL() HIGH(GPIO_SSC_DOUT)\r

-\r

- i = 0;\r

- for(;;) {\r

- while(!(PIO_PIN_DATA_STATUS & (1<<GPIO_SSC_CLK))) {\r

- if(BUTTON_PRESS()) {\r

- DbpString("Stopped");\r

- return;\r

- }\r

- WDT_HIT();\r

- }\r

-\r

- if (ledcontrol)\r

- LED_D_ON();\r

-\r

- if(tab[i])\r

- OPEN_COIL();\r

- else\r

- SHORT_COIL();\r

-\r

- if (ledcontrol)\r

- LED_D_OFF();\r

-\r

- while(PIO_PIN_DATA_STATUS & (1<<GPIO_SSC_CLK)) {\r

- if(BUTTON_PRESS()) {\r

- DbpString("Stopped");\r

- return;\r

- }\r

- WDT_HIT();\r

- }\r

-\r

- i++;\r

- if(i == period) i = 0;\r

- }\r

-}\r

-\r

-// compose fc/8 fc/10 waveform\r

-static void fc(int c, int *n) {\r

- BYTE *dest = (BYTE *)BigBuf;\r

- int idx;\r

-\r

- // for when we want an fc8 pattern every 4 logical bits\r

- if(c==0) {\r

- dest[((*n)++)]=1;\r

- dest[((*n)++)]=0;\r

- }\r

- // an fc/8 encoded bit is a bit pattern of 11000000 x6 = 48 samples\r

- if(c==8) {\r

- for (idx=0; idx<6; idx++) {\r

- dest[((*n)++)]=1;\r

- dest[((*n)++)]=0;\r

- }\r

-\r

- // an fc/10 encoded bit is a bit pattern of 1110000000 x5 = 50 samples\r

- if(c==10) {\r

- for (idx=0; idx<5; idx++) {\r

- dest[((*n)++)]=1;\r

- dest[((*n)++)]=0;\r

- }\r

-}\r

-\r

-// prepare a waveform pattern in the buffer based on the ID given then\r

-// simulate a HID tag until the button is pressed\r

-void CmdHIDsimTAG(int hi, int lo, int ledcontrol)\r

-{\r

- int n=0, i=0;\r

- /*\r

- HID tag bitstream format\r

- The tag contains a 44bit unique code. This is sent out MSB first in sets of 4 bits\r

- A 1 bit is represented as 6 fc8 and 5 fc10 patterns\r

- A 0 bit is represented as 5 fc10 and 6 fc8 patterns\r

- A fc8 is inserted before every 4 bits\r

- A special start of frame pattern is used consisting a0b0 where a and b are neither 0\r

- nor 1 bits, they are special patterns (a = set of 12 fc8 and b = set of 10 fc10)\r

- */\r

-\r

- if (hi>0xFFF) {\r

- DbpString("Tags can only have 44 bits.");\r

- return;\r

- }\r

- fc(0,&n);\r

- // special start of frame marker containing invalid bit sequences\r

- fc(8, &n); fc(8, &n); // invalid\r

- fc(8, &n); fc(10, &n); // logical 0\r

- fc(10, &n); fc(10, &n); // invalid\r

- fc(8, &n); fc(10, &n); // logical 0\r

-\r

- WDT_HIT();\r

- // manchester encode bits 43 to 32\r

- for (i=11; i>=0; i--) {\r

- if ((i%4)==3) fc(0,&n);\r

- if ((hi>>i)&1) {\r

- fc(10, &n); fc(8, &n); // low-high transition\r

- } else {\r

- fc(8, &n); fc(10, &n); // high-low transition\r

- }\r

-\r

- WDT_HIT();\r

- // manchester encode bits 31 to 0\r

- for (i=31; i>=0; i--) {\r

- if ((i%4)==3) fc(0,&n);\r

- if ((lo>>i)&1) {\r

- fc(10, &n); fc(8, &n); // low-high transition\r

- } else {\r

- fc(8, &n); fc(10, &n); // high-low transition\r

- }\r

-\r

- if (ledcontrol)\r

- LED_A_ON();\r

- SimulateTagLowFrequency(n, ledcontrol);\r

-\r

- if (ledcontrol)\r

- LED_A_OFF();\r

-}\r

-\r

-// loop to capture raw HID waveform then FSK demodulate the TAG ID from it\r

-void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)\r

-{\r

- BYTE *dest = (BYTE *)BigBuf;\r

- int m=0, n=0, i=0, idx=0, found=0, lastval=0;\r

- DWORD hi=0, lo=0;\r

-\r

- FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz\r

- FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);\r

-\r

- // Connect the A/D to the peak-detected low-frequency path.\r

- SetAdcMuxFor(GPIO_MUXSEL_LOPKD);\r

-\r

- // Give it a bit of time for the resonant antenna to settle.\r

- SpinDelay(50);\r

-\r

- // Now set up the SSC to get the ADC samples that are now streaming at us.\r

- FpgaSetupSsc();\r

-\r

- for(;;) {\r

- WDT_HIT();\r

- if (ledcontrol)\r

- LED_A_ON();\r

- if(BUTTON_PRESS()) {\r

- DbpString("Stopped");\r

- if (ledcontrol)\r

- LED_A_OFF();\r

- return;\r

- }\r

-\r

- i = 0;\r

- m = sizeof(BigBuf);\r

- memset(dest,128,m);\r

- for(;;) {\r

- if(SSC_STATUS & (SSC_STATUS_TX_READY)) {\r

- SSC_TRANSMIT_HOLDING = 0x43;\r

- if (ledcontrol)\r

- LED_D_ON();\r

- }\r

- if(SSC_STATUS & (SSC_STATUS_RX_READY)) {\r

- dest[i] = (BYTE)SSC_RECEIVE_HOLDING;\r

- // we don't care about actual value, only if it's more or less than a\r

- // threshold essentially we capture zero crossings for later analysis\r

- if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;\r

- i++;\r

- if (ledcontrol)\r

- LED_D_OFF();\r

- if(i >= m) {\r

- break;\r

- }\r

-\r

- // FSK demodulator\r

-\r

- // sync to first lo-hi transition\r

- for( idx=1; idx<m; idx++) {\r

- if (dest[idx-1]<dest[idx])\r

- lastval=idx;\r

- break;\r

- }\r

- WDT_HIT();\r

-\r

- // count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)\r

- // or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere\r

- // between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10\r

- for( i=0; idx<m; idx++) {\r

- if (dest[idx-1]<dest[idx]) {\r

- dest[i]=idx-lastval;\r

- if (dest[i] <= 8) {\r

- dest[i]=1;\r

- } else {\r

- dest[i]=0;\r

- }\r

-\r

- lastval=idx;\r

- i++;\r

- }\r

- m=i;\r

- WDT_HIT();\r

-\r

- // we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns\r

- lastval=dest[0];\r

- idx=0;\r

- i=0;\r

- n=0;\r

- for( idx=0; idx<m; idx++) {\r

- if (dest[idx]==lastval) {\r

- n++;\r

- } else {\r

- // a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,\r

- // an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets\r

- // swallowed up by rounding\r

- // expected results are 1 or 2 bits, any more and it's an invalid manchester encoding\r

- // special start of frame markers use invalid manchester states (no transitions) by using sequences\r

- // like 111000\r

- if (dest[idx-1]) {\r

- n=(n+1)/6; // fc/8 in sets of 6\r

- } else {\r

- n=(n+1)/5; // fc/10 in sets of 5\r

- }\r

- switch (n) { // stuff appropriate bits in buffer\r

- case 0:\r

- case 1: // one bit\r

- dest[i++]=dest[idx-1];\r

- break;\r

- case 2: // two bits\r

- dest[i++]=dest[idx-1];\r

- break;\r

- case 3: // 3 bit start of frame markers\r

- dest[i++]=dest[idx-1];\r

- break;\r

- // When a logic 0 is immediately followed by the start of the next transmisson\r

- // (special pattern) a pattern of 4 bit duration lengths is created.\r

- case 4:\r

- dest[i++]=dest[idx-1];\r

- break;\r

- default: // this shouldn't happen, don't stuff any bits\r

- break;\r

- }\r

- n=0;\r

- lastval=dest[idx];\r

- }\r

- m=i;\r

- WDT_HIT();\r

-\r

- // final loop, go over previously decoded manchester data and decode into usable tag ID\r

- // 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0\r

- for( idx=0; idx<m-6; idx++) {\r

- // search for a start of frame marker\r

- if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )\r

- {\r

- found=1;\r

- idx+=6;\r

- if (found && (hi|lo)) {\r

- DbpString("TAG ID");\r

- DbpIntegers(hi, lo, (lo>>1)&0xffff);\r

- /* if we're only looking for one tag */\r

- if (findone)\r

- {\r

- *high = hi;\r

- *low = lo;\r

- return;\r

- }\r

- hi=0;\r

- lo=0;\r

- found=0;\r

- }\r

- if (found) {\r

- if (dest[idx] && (!dest[idx+1]) ) {\r

- hi=(hi<<1)|(lo>>31);\r

- lo=(lo<<1)|0;\r

- } else if ( (!dest[idx]) && dest[idx+1]) {\r

- hi=(hi<<1)|(lo>>31);\r

- lo=(lo<<1)|1;\r

- } else {\r

- found=0;\r

- hi=0;\r

- lo=0;\r

- }\r

- idx++;\r

- }\r

- if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )\r

- {\r

- found=1;\r

- idx+=6;\r

- if (found && (hi|lo)) {\r

- DbpString("TAG ID");\r

- DbpIntegers(hi, lo, (lo>>1)&0xffff);\r

- /* if we're only looking for one tag */\r

- if (findone)\r

- {\r

- *high = hi;\r

- *low = lo;\r

- return;\r

- }\r

- hi=0;\r

- lo=0;\r

- found=0;\r

- }\r

- WDT_HIT();\r

- }\r

-}\r

+//-----------------------------------------------------------------------------

+// This code is licensed to you under the terms of the GNU GPL, version 2 or,

+// at your option, any later version. See the LICENSE.txt file for the text of

+// the license.

+//-----------------------------------------------------------------------------

+// Miscellaneous routines for low frequency tag operations.

+// Tags supported here so far are Texas Instruments (TI), HID

+// Also routines for raw mode reading/simulating of LF waveform

+//-----------------------------------------------------------------------------

+

+#include "proxmark3.h"

+#include "apps.h"

+#include "util.h"

+#include "hitag2.h"

+#include "crc16.h"

+#include "string.h"

+

+void AcquireRawAdcSamples125k(int divisor)

+{

+ if ( (divisor == 1) || (divisor < 0) || (divisor > 255) )

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+ else if (divisor == 0)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ else

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor);

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ SpinDelay(50);

+

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ // Now call the acquisition routine

+ DoAcquisition125k();

+}

+

+// split into two routines so we can avoid timing issues after sending commands //

+void DoAcquisition125k(void)

+{

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int n = sizeof(BigBuf);

+ int i;

+

+ memset(dest, 0, n);

+ i = 0;

+ for(;;) {

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ LED_D_ON();

+ }

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ i++;

+ LED_D_OFF();

+ if (i >= n) break;

+ }

+ Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...",

+ dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]);

+}

+

+void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, uint8_t *command)

+{

+ int at134khz;

+

+ /* Make sure the tag is reset */

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ SpinDelay(2500);

+

+ // see if 'h' was specified

+ if (command[strlen((char *) command) - 1] == 'h')

+ at134khz = TRUE;

+ else

+ at134khz = FALSE;

+

+ if (at134khz)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+ else

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ SpinDelay(50);

+ // And a little more time for the tag to fully power up

+ SpinDelay(2000);

+

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ // now modulate the reader field

+ while(*command != '\0' && *command != ' ') {

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ LED_D_OFF();

+ SpinDelayUs(delay_off);

+ if (at134khz)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+ else

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+ LED_D_ON();

+ if(*(command++) == '0')

+ SpinDelayUs(period_0);

+ else

+ SpinDelayUs(period_1);

+ }

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ LED_D_OFF();

+ SpinDelayUs(delay_off);

+ if (at134khz)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+ else

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // now do the read

+ DoAcquisition125k();

+}

+

+/* blank r/w tag data stream

+...0000000000000000 01111111

+1010101010101010101010101010101010101010101010101010101010101010

+0011010010100001

+01111111

+101010101010101[0]000...

+

+[5555fe852c5555555555555555fe0000]

+*/

+void ReadTItag(void)

+{

+ // some hardcoded initial params

+ // when we read a TI tag we sample the zerocross line at 2Mhz

+ // TI tags modulate a 1 as 16 cycles of 123.2Khz

+ // TI tags modulate a 0 as 16 cycles of 134.2Khz

+ #define FSAMPLE 2000000

+ #define FREQLO 123200

+ #define FREQHI 134200

+

+ signed char *dest = (signed char *)BigBuf;

+ int n = sizeof(BigBuf);

+// int *dest = GraphBuffer;

+// int n = GraphTraceLen;

+

+ // 128 bit shift register [shift3:shift2:shift1:shift0]

+ uint32_t shift3 = 0, shift2 = 0, shift1 = 0, shift0 = 0;

+

+ int i, cycles=0, samples=0;

+ // how many sample points fit in 16 cycles of each frequency

+ uint32_t sampleslo = (FSAMPLE<<4)/FREQLO, sampleshi = (FSAMPLE<<4)/FREQHI;

+ // when to tell if we're close enough to one freq or another

+ uint32_t threshold = (sampleslo - sampleshi + 1)>>1;

+

+ // TI tags charge at 134.2Khz

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+

+ // Place FPGA in passthrough mode, in this mode the CROSS_LO line

+ // connects to SSP_DIN and the SSP_DOUT logic level controls

+ // whether we're modulating the antenna (high)

+ // or listening to the antenna (low)

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);

+

+ // get TI tag data into the buffer

+ AcquireTiType();

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+

+ for (i=0; i<n-1; i++) {

+ // count cycles by looking for lo to hi zero crossings

+ if ( (dest[i]<0) && (dest[i+1]>0) ) {

+ cycles++;

+ // after 16 cycles, measure the frequency

+ if (cycles>15) {

+ cycles=0;

+ samples=i-samples; // number of samples in these 16 cycles

+

+ // TI bits are coming to us lsb first so shift them

+ // right through our 128 bit right shift register

+ shift0 = (shift0>>1) | (shift1 << 31);

+ shift1 = (shift1>>1) | (shift2 << 31);

+ shift2 = (shift2>>1) | (shift3 << 31);

+ shift3 >>= 1;

+

+ // check if the cycles fall close to the number

+ // expected for either the low or high frequency

+ if ( (samples>(sampleslo-threshold)) && (samples<(sampleslo+threshold)) ) {

+ // low frequency represents a 1

+ shift3 |= (1<<31);

+ } else if ( (samples>(sampleshi-threshold)) && (samples<(sampleshi+threshold)) ) {

+ // high frequency represents a 0

+ } else {

+ // probably detected a gay waveform or noise

+ // use this as gaydar or discard shift register and start again

+ shift3 = shift2 = shift1 = shift0 = 0;

+ }

+ samples = i;

+

+ // for each bit we receive, test if we've detected a valid tag

+

+ // if we see 17 zeroes followed by 6 ones, we might have a tag

+ // remember the bits are backwards

+ if ( ((shift0 & 0x7fffff) == 0x7e0000) ) {

+ // if start and end bytes match, we have a tag so break out of the loop

+ if ( ((shift0>>16)&0xff) == ((shift3>>8)&0xff) ) {

+ cycles = 0xF0B; //use this as a flag (ugly but whatever)

+ break;

+ }

+

+ // if flag is set we have a tag

+ if (cycles!=0xF0B) {

+ DbpString("Info: No valid tag detected.");

+ } else {

+ // put 64 bit data into shift1 and shift0

+ shift0 = (shift0>>24) | (shift1 << 8);

+ shift1 = (shift1>>24) | (shift2 << 8);

+

+ // align 16 bit crc into lower half of shift2

+ shift2 = ((shift2>>24) | (shift3 << 8)) & 0x0ffff;

+

+ // if r/w tag, check ident match

+ if ( shift3&(1<<15) ) {

+ DbpString("Info: TI tag is rewriteable");

+ // only 15 bits compare, last bit of ident is not valid

+ if ( ((shift3>>16)^shift0)&0x7fff ) {

+ DbpString("Error: Ident mismatch!");

+ } else {

+ DbpString("Info: TI tag ident is valid");

+ }

+ } else {

+ DbpString("Info: TI tag is readonly");

+ }

+

+ // WARNING the order of the bytes in which we calc crc below needs checking

+ // i'm 99% sure the crc algorithm is correct, but it may need to eat the

+ // bytes in reverse or something

+ // calculate CRC

+ uint32_t crc=0;

+

+ crc = update_crc16(crc, (shift0)&0xff);

+ crc = update_crc16(crc, (shift0>>8)&0xff);

+ crc = update_crc16(crc, (shift0>>16)&0xff);

+ crc = update_crc16(crc, (shift0>>24)&0xff);

+ crc = update_crc16(crc, (shift1)&0xff);

+ crc = update_crc16(crc, (shift1>>8)&0xff);

+ crc = update_crc16(crc, (shift1>>16)&0xff);

+ crc = update_crc16(crc, (shift1>>24)&0xff);

+

+ Dbprintf("Info: Tag data: %x%08x, crc=%x",

+ (unsigned int)shift1, (unsigned int)shift0, (unsigned int)shift2 & 0xFFFF);

+ if (crc != (shift2&0xffff)) {

+ Dbprintf("Error: CRC mismatch, expected %x", (unsigned int)crc);

+ } else {

+ DbpString("Info: CRC is good");

+ }

+}

+

+void WriteTIbyte(uint8_t b)

+{

+ int i = 0;

+

+ // modulate 8 bits out to the antenna

+ for (i=0; i<8; i++)

+ {

+ if (b&(1<<i)) {

+ // stop modulating antenna

+ LOW(GPIO_SSC_DOUT);

+ SpinDelayUs(1000);

+ // modulate antenna

+ HIGH(GPIO_SSC_DOUT);

+ SpinDelayUs(1000);

+ } else {

+ // stop modulating antenna

+ LOW(GPIO_SSC_DOUT);

+ SpinDelayUs(300);

+ // modulate antenna

+ HIGH(GPIO_SSC_DOUT);

+ SpinDelayUs(1700);

+ }

+}

+

+void AcquireTiType(void)

+{

+ int i, j, n;

+ // tag transmission is <20ms, sampling at 2M gives us 40K samples max

+ // each sample is 1 bit stuffed into a uint32_t so we need 1250 uint32_t

+ #define TIBUFLEN 1250

+

+ // clear buffer

+ memset(BigBuf,0,sizeof(BigBuf));

+

+ // Set up the synchronous serial port

+ AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DIN;

+ AT91C_BASE_PIOA->PIO_ASR = GPIO_SSC_DIN;

+

+ // steal this pin from the SSP and use it to control the modulation

+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;

+ AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;

+

+ AT91C_BASE_SSC->SSC_CR = AT91C_SSC_SWRST;

+ AT91C_BASE_SSC->SSC_CR = AT91C_SSC_RXEN | AT91C_SSC_TXEN;

+

+ // Sample at 2 Mbit/s, so TI tags are 16.2 vs. 14.9 clocks long

+ // 48/2 = 24 MHz clock must be divided by 12

+ AT91C_BASE_SSC->SSC_CMR = 12;

+

+ AT91C_BASE_SSC->SSC_RCMR = SSC_CLOCK_MODE_SELECT(0);

+ AT91C_BASE_SSC->SSC_RFMR = SSC_FRAME_MODE_BITS_IN_WORD(32) | AT91C_SSC_MSBF;

+ AT91C_BASE_SSC->SSC_TCMR = 0;

+ AT91C_BASE_SSC->SSC_TFMR = 0;

+

+ LED_D_ON();

+

+ // modulate antenna

+ HIGH(GPIO_SSC_DOUT);

+

+ // Charge TI tag for 50ms.

+ SpinDelay(50);

+

+ // stop modulating antenna and listen

+ LOW(GPIO_SSC_DOUT);

+

+ LED_D_OFF();

+

+ i = 0;

+ for(;;) {

+ if(AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

+ BigBuf[i] = AT91C_BASE_SSC->SSC_RHR; // store 32 bit values in buffer

+ i++; if(i >= TIBUFLEN) break;

+ }

+ WDT_HIT();

+ }

+

+ // return stolen pin to SSP

+ AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DOUT;

+ AT91C_BASE_PIOA->PIO_ASR = GPIO_SSC_DIN | GPIO_SSC_DOUT;

+

+ char *dest = (char *)BigBuf;

+ n = TIBUFLEN*32;

+ // unpack buffer

+ for (i=TIBUFLEN-1; i>=0; i--) {

+ for (j=0; j<32; j++) {

+ if(BigBuf[i] & (1 << j)) {

+ dest[--n] = 1;

+ } else {

+ dest[--n] = -1;

+ }

+}

+

+// arguments: 64bit data split into 32bit idhi:idlo and optional 16bit crc

+// if crc provided, it will be written with the data verbatim (even if bogus)

+// if not provided a valid crc will be computed from the data and written.

+void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc)

+{

+ if(crc == 0) {

+ crc = update_crc16(crc, (idlo)&0xff);

+ crc = update_crc16(crc, (idlo>>8)&0xff);

+ crc = update_crc16(crc, (idlo>>16)&0xff);

+ crc = update_crc16(crc, (idlo>>24)&0xff);

+ crc = update_crc16(crc, (idhi)&0xff);

+ crc = update_crc16(crc, (idhi>>8)&0xff);

+ crc = update_crc16(crc, (idhi>>16)&0xff);

+ crc = update_crc16(crc, (idhi>>24)&0xff);

+ }

+ Dbprintf("Writing to tag: %x%08x, crc=%x",

+ (unsigned int) idhi, (unsigned int) idlo, crc);

+

+ // TI tags charge at 134.2Khz

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz

+ // Place FPGA in passthrough mode, in this mode the CROSS_LO line

+ // connects to SSP_DIN and the SSP_DOUT logic level controls

+ // whether we're modulating the antenna (high)

+ // or listening to the antenna (low)

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_PASSTHRU);

+ LED_A_ON();

+

+ // steal this pin from the SSP and use it to control the modulation

+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT;

+ AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;

+

+ // writing algorithm:

+ // a high bit consists of a field off for 1ms and field on for 1ms

+ // a low bit consists of a field off for 0.3ms and field on for 1.7ms

+ // initiate a charge time of 50ms (field on) then immediately start writing bits

+ // start by writing 0xBB (keyword) and 0xEB (password)

+ // then write 80 bits of data (or 64 bit data + 16 bit crc if you prefer)

+ // finally end with 0x0300 (write frame)

+ // all data is sent lsb firts

+ // finish with 15ms programming time

+

+ // modulate antenna

+ HIGH(GPIO_SSC_DOUT);

+ SpinDelay(50); // charge time

+

+ WriteTIbyte(0xbb); // keyword

+ WriteTIbyte(0xeb); // password

+ WriteTIbyte( (idlo )&0xff );

+ WriteTIbyte( (idlo>>8 )&0xff );

+ WriteTIbyte( (idlo>>16)&0xff );

+ WriteTIbyte( (idlo>>24)&0xff );

+ WriteTIbyte( (idhi )&0xff );

+ WriteTIbyte( (idhi>>8 )&0xff );

+ WriteTIbyte( (idhi>>16)&0xff );

+ WriteTIbyte( (idhi>>24)&0xff ); // data hi to lo

+ WriteTIbyte( (crc )&0xff ); // crc lo

+ WriteTIbyte( (crc>>8 )&0xff ); // crc hi

+ WriteTIbyte(0x00); // write frame lo

+ WriteTIbyte(0x03); // write frame hi

+ HIGH(GPIO_SSC_DOUT);

+ SpinDelay(50); // programming time

+

+ LED_A_OFF();

+

+ // get TI tag data into the buffer

+ AcquireTiType();

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ DbpString("Now use tiread to check");

+}

+

+void SimulateTagLowFrequency(int period, int gap, int ledcontrol)

+{

+ int i;

+ uint8_t *tab = (uint8_t *)BigBuf;

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT);

+

+ AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK;

+

+ AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT;

+ AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_CLK;

+

+#define SHORT_COIL() LOW(GPIO_SSC_DOUT)

+#define OPEN_COIL() HIGH(GPIO_SSC_DOUT)

+

+ i = 0;

+ for(;;) {

+ while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) {

+ if(BUTTON_PRESS()) {

+ DbpString("Stopped");

+ return;

+ }

+ WDT_HIT();

+ }

+

+ if (ledcontrol)

+ LED_D_ON();

+

+ if(tab[i])

+ OPEN_COIL();

+ else

+ SHORT_COIL();

+

+ if (ledcontrol)

+ LED_D_OFF();

+

+ while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) {

+ if(BUTTON_PRESS()) {

+ DbpString("Stopped");

+ return;

+ }

+ WDT_HIT();

+ }

+

+ i++;

+ if(i == period) {

+ i = 0;

+ if (gap) {

+ SHORT_COIL();

+ SpinDelayUs(gap);

+ }

+}

+

+#define DEBUG_FRAME_CONTENTS 1

+void SimulateTagLowFrequencyBidir(int divisor, int t0)

+{

+}

+

+// compose fc/8 fc/10 waveform

+static void fc(int c, int *n) {

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int idx;

+

+ // for when we want an fc8 pattern every 4 logical bits

+ if(c==0) {

+ dest[((*n)++)]=1;

+ dest[((*n)++)]=0;

+ }

+ // an fc/8 encoded bit is a bit pattern of 11000000 x6 = 48 samples

+ if(c==8) {

+ for (idx=0; idx<6; idx++) {

+ dest[((*n)++)]=1;

+ dest[((*n)++)]=0;

+ }

+

+ // an fc/10 encoded bit is a bit pattern of 1110000000 x5 = 50 samples

+ if(c==10) {

+ for (idx=0; idx<5; idx++) {

+ dest[((*n)++)]=1;

+ dest[((*n)++)]=0;

+ }

+}

+

+// prepare a waveform pattern in the buffer based on the ID given then

+// simulate a HID tag until the button is pressed

+void CmdHIDsimTAG(int hi, int lo, int ledcontrol)

+{

+ int n=0, i=0;

+ /*

+ HID tag bitstream format

+ The tag contains a 44bit unique code. This is sent out MSB first in sets of 4 bits

+ A 1 bit is represented as 6 fc8 and 5 fc10 patterns

+ A 0 bit is represented as 5 fc10 and 6 fc8 patterns

+ A fc8 is inserted before every 4 bits

+ A special start of frame pattern is used consisting a0b0 where a and b are neither 0

+ nor 1 bits, they are special patterns (a = set of 12 fc8 and b = set of 10 fc10)

+ */

+

+ if (hi>0xFFF) {

+ DbpString("Tags can only have 44 bits.");

+ return;

+ }

+ fc(0,&n);

+ // special start of frame marker containing invalid bit sequences

+ fc(8, &n); fc(8, &n); // invalid

+ fc(8, &n); fc(10, &n); // logical 0

+ fc(10, &n); fc(10, &n); // invalid

+ fc(8, &n); fc(10, &n); // logical 0

+

+ WDT_HIT();

+ // manchester encode bits 43 to 32

+ for (i=11; i>=0; i--) {

+ if ((i%4)==3) fc(0,&n);

+ if ((hi>>i)&1) {

+ fc(10, &n); fc(8, &n); // low-high transition

+ } else {

+ fc(8, &n); fc(10, &n); // high-low transition

+ }

+

+ WDT_HIT();

+ // manchester encode bits 31 to 0

+ for (i=31; i>=0; i--) {

+ if ((i%4)==3) fc(0,&n);

+ if ((lo>>i)&1) {

+ fc(10, &n); fc(8, &n); // low-high transition

+ } else {

+ fc(8, &n); fc(10, &n); // high-low transition

+ }

+

+ if (ledcontrol)

+ LED_A_ON();

+ SimulateTagLowFrequency(n, 0, ledcontrol);

+

+ if (ledcontrol)

+ LED_A_OFF();

+}

+

+// loop to capture raw HID waveform then FSK demodulate the TAG ID from it

+void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol)

+{

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int m=0, n=0, i=0, idx=0, found=0, lastval=0;

+ uint32_t hi2=0, hi=0, lo=0;

+

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ SpinDelay(50);

+

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ for(;;) {

+ WDT_HIT();

+ if (ledcontrol)

+ LED_A_ON();

+ if(BUTTON_PRESS()) {

+ DbpString("Stopped");

+ if (ledcontrol)

+ LED_A_OFF();

+ return;

+ }

+

+ i = 0;

+ m = sizeof(BigBuf);

+ memset(dest,128,m);

+ for(;;) {

+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ if (ledcontrol)

+ LED_D_ON();

+ }

+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ // we don't care about actual value, only if it's more or less than a

+ // threshold essentially we capture zero crossings for later analysis

+ if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;

+ i++;

+ if (ledcontrol)

+ LED_D_OFF();

+ if(i >= m) {

+ break;

+ }

+

+ // FSK demodulator

+

+ // sync to first lo-hi transition

+ for( idx=1; idx<m; idx++) {

+ if (dest[idx-1]<dest[idx])

+ lastval=idx;

+ break;

+ }

+ WDT_HIT();

+

+ // count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)

+ // or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere

+ // between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10

+ for( i=0; idx<m; idx++) {

+ if (dest[idx-1]<dest[idx]) {

+ dest[i]=idx-lastval;

+ if (dest[i] <= 8) {

+ dest[i]=1;

+ } else {

+ dest[i]=0;

+ }

+

+ lastval=idx;

+ i++;

+ }

+ m=i;

+ WDT_HIT();

+

+ // we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns

+ lastval=dest[0];

+ idx=0;

+ i=0;

+ n=0;

+ for( idx=0; idx<m; idx++) {

+ if (dest[idx]==lastval) {

+ n++;

+ } else {

+ // a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,

+ // an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets

+ // swallowed up by rounding

+ // expected results are 1 or 2 bits, any more and it's an invalid manchester encoding

+ // special start of frame markers use invalid manchester states (no transitions) by using sequences

+ // like 111000

+ if (dest[idx-1]) {

+ n=(n+1)/6; // fc/8 in sets of 6

+ } else {

+ n=(n+1)/5; // fc/10 in sets of 5

+ }

+ switch (n) { // stuff appropriate bits in buffer

+ case 0:

+ case 1: // one bit

+ dest[i++]=dest[idx-1];

+ break;

+ case 2: // two bits

+ dest[i++]=dest[idx-1];

+ break;

+ case 3: // 3 bit start of frame markers

+ dest[i++]=dest[idx-1];

+ break;

+ // When a logic 0 is immediately followed by the start of the next transmisson

+ // (special pattern) a pattern of 4 bit duration lengths is created.

+ case 4:

+ dest[i++]=dest[idx-1];

+ break;

+ default: // this shouldn't happen, don't stuff any bits

+ break;

+ }

+ n=0;

+ lastval=dest[idx];

+ }

+ m=i;

+ WDT_HIT();

+

+ // final loop, go over previously decoded manchester data and decode into usable tag ID

+ // 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0

+ for( idx=0; idx<m-6; idx++) {

+ // search for a start of frame marker

+ if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )

+ {

+ found=1;

+ idx+=6;

+ if (found && (hi2|hi|lo)) {

+ if (hi2 != 0){

+ Dbprintf("TAG ID: %x%08x%08x (%d)",

+ (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);

+ }

+ else {

+ Dbprintf("TAG ID: %x%08x (%d)",

+ (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);

+ }

+ /* if we're only looking for one tag */

+ if (findone)

+ {

+ *high = hi;

+ *low = lo;

+ return;

+ }

+ hi2=0;

+ hi=0;

+ lo=0;

+ found=0;

+ }

+ if (found) {

+ if (dest[idx] && (!dest[idx+1]) ) {

+ hi2=(hi2<<1)|(hi>>31);

+ hi=(hi<<1)|(lo>>31);

+ lo=(lo<<1)|0;

+ } else if ( (!dest[idx]) && dest[idx+1]) {

+ hi2=(hi2<<1)|(hi>>31);

+ hi=(hi<<1)|(lo>>31);

+ lo=(lo<<1)|1;

+ } else {

+ found=0;

+ hi2=0;

+ hi=0;

+ lo=0;

+ }

+ idx++;

+ }

+ if ( dest[idx] && dest[idx+1] && dest[idx+2] && (!dest[idx+3]) && (!dest[idx+4]) && (!dest[idx+5]) )

+ {

+ found=1;

+ idx+=6;

+ if (found && (hi|lo)) {

+ if (hi2 != 0){

+ Dbprintf("TAG ID: %x%08x%08x (%d)",

+ (unsigned int) hi2, (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);

+ }

+ else {

+ Dbprintf("TAG ID: %x%08x (%d)",

+ (unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF);

+ }

+ /* if we're only looking for one tag */

+ if (findone)

+ {

+ *high = hi;

+ *low = lo;

+ return;

+ }

+ hi2=0;

+ hi=0;

+ lo=0;

+ found=0;

+ }

+ WDT_HIT();

+ }

+}

+

+void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol)

+{

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int m=0, n=0, i=0, idx=0, lastval=0;

+ int found=0;

+ uint32_t code=0, code2=0;

+ //uint32_t hi2=0, hi=0, lo=0;

+

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ SpinDelay(50);

+

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ for(;;) {

+ WDT_HIT();

+ if (ledcontrol)

+ LED_A_ON();

+ if(BUTTON_PRESS()) {

+ DbpString("Stopped");

+ if (ledcontrol)

+ LED_A_OFF();

+ return;

+ }

+

+ i = 0;

+ m = sizeof(BigBuf);

+ memset(dest,128,m);

+ for(;;) {

+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ if (ledcontrol)

+ LED_D_ON();

+ }

+ if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ // we don't care about actual value, only if it's more or less than a

+ // threshold essentially we capture zero crossings for later analysis

+ if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;

+ i++;

+ if (ledcontrol)

+ LED_D_OFF();

+ if(i >= m) {

+ break;

+ }

+

+ // FSK demodulator

+

+ // sync to first lo-hi transition

+ for( idx=1; idx<m; idx++) {

+ if (dest[idx-1]<dest[idx])

+ lastval=idx;

+ break;

+ }

+ WDT_HIT();

+

+ // count cycles between consecutive lo-hi transitions, there should be either 8 (fc/8)

+ // or 10 (fc/10) cycles but in practice due to noise etc we may end up with with anywhere

+ // between 7 to 11 cycles so fuzz it by treat anything <9 as 8 and anything else as 10

+ for( i=0; idx<m; idx++) {

+ if (dest[idx-1]<dest[idx]) {

+ dest[i]=idx-lastval;

+ if (dest[i] <= 8) {

+ dest[i]=1;

+ } else {

+ dest[i]=0;

+ }

+

+ lastval=idx;

+ i++;

+ }

+ m=i;

+ WDT_HIT();

+

+ // we now have a set of cycle counts, loop over previous results and aggregate data into bit patterns

+ lastval=dest[0];

+ idx=0;

+ i=0;

+ n=0;

+ for( idx=0; idx<m; idx++) {

+ if (dest[idx]==lastval) {

+ n++;

+ } else {

+ // a bit time is five fc/10 or six fc/8 cycles so figure out how many bits a pattern width represents,

+ // an extra fc/8 pattern preceeds every 4 bits (about 200 cycles) just to complicate things but it gets

+ // swallowed up by rounding

+ // expected results are 1 or 2 bits, any more and it's an invalid manchester encoding

+ // special start of frame markers use invalid manchester states (no transitions) by using sequences

+ // like 111000

+ if (dest[idx-1]) {

+ n=(n+1)/7; // fc/8 in sets of 7

+ } else {

+ n=(n+1)/6; // fc/10 in sets of 6

+ }

+ switch (n) { // stuff appropriate bits in buffer

+ case 0:

+ case 1: // one bit

+ dest[i++]=dest[idx-1]^1;

+ //Dbprintf("%d",dest[idx-1]);

+ break;

+ case 2: // two bits

+ dest[i++]=dest[idx-1]^1;

+ //Dbprintf("%d",dest[idx-1]);

+ break;

+ case 3: // 3 bit start of frame markers

+ for(int j=0; j<3; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 4:

+ for(int j=0; j<4; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 5:

+ for(int j=0; j<5; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 6:

+ for(int j=0; j<6; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 7:

+ for(int j=0; j<7; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 8:

+ for(int j=0; j<8; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 9:

+ for(int j=0; j<9; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 10:

+ for(int j=0; j<10; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 11:

+ for(int j=0; j<11; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ case 12:

+ for(int j=0; j<12; j++){

+ dest[i++]=dest[idx-1]^1;

+ // Dbprintf("%d",dest[idx-1]);

+ }

+ break;

+ default: // this shouldn't happen, don't stuff any bits

+ //Dbprintf("%d",dest[idx-1]);

+ break;

+ }

+ n=0;

+ lastval=dest[idx];

+ }

+ }//end for

+ /*for(int j=0; j<64;j+=8){

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[j],dest[j+1],dest[j+2],dest[j+3],dest[j+4],dest[j+5],dest[j+6],dest[j+7]);

+ }

+ Dbprintf("\n");*/

+ m=i;

+ WDT_HIT();

+

+ for( idx=0; idx<m-9; idx++) {

+ if ( !(dest[idx]) && !(dest[idx+1]) && !(dest[idx+2]) && !(dest[idx+3]) && !(dest[idx+4]) && !(dest[idx+5]) && !(dest[idx+6]) && !(dest[idx+7]) && !(dest[idx+8])&& (dest[idx+9])){

+ found=1;

+ //idx+=9;

+ if (found) {

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx], dest[idx+1], dest[idx+2],dest[idx+3],dest[idx+4],dest[idx+5],dest[idx+6],dest[idx+7]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+8], dest[idx+9], dest[idx+10],dest[idx+11],dest[idx+12],dest[idx+13],dest[idx+14],dest[idx+15]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+16],dest[idx+17],dest[idx+18],dest[idx+19],dest[idx+20],dest[idx+21],dest[idx+22],dest[idx+23]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+24],dest[idx+25],dest[idx+26],dest[idx+27],dest[idx+28],dest[idx+29],dest[idx+30],dest[idx+31]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+32],dest[idx+33],dest[idx+34],dest[idx+35],dest[idx+36],dest[idx+37],dest[idx+38],dest[idx+39]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+40],dest[idx+41],dest[idx+42],dest[idx+43],dest[idx+44],dest[idx+45],dest[idx+46],dest[idx+47]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+48],dest[idx+49],dest[idx+50],dest[idx+51],dest[idx+52],dest[idx+53],dest[idx+54],dest[idx+55]);

+ Dbprintf("%d%d%d%d%d%d%d%d",dest[idx+56],dest[idx+57],dest[idx+58],dest[idx+59],dest[idx+60],dest[idx+61],dest[idx+62],dest[idx+63]);

+

+ short version='\x00';

+ char unknown='\x00';

+ uint16_t number=0;

+ for(int j=14;j<18;j++){

+ //Dbprintf("%d",dest[idx+j]);

+ version <<=1;

+ if (dest[idx+j]) version |= 1;

+ }

+ for(int j=19;j<27;j++){

+ //Dbprintf("%d",dest[idx+j]);

+ unknown <<=1;

+ if (dest[idx+j]) unknown |= 1;

+ }

+ for(int j=36;j<45;j++){

+ //Dbprintf("%d",dest[idx+j]);

+ number <<=1;

+ if (dest[idx+j]) number |= 1;

+ }

+ for(int j=46;j<53;j++){

+ //Dbprintf("%d",dest[idx+j]);

+ number <<=1;

+ if (dest[idx+j]) number |= 1;

+ }

+ for(int j=0; j<32; j++){

+ code <<=1;

+ if(dest[idx+j]) code |= 1;

+ }

+ for(int j=32; j<64; j++){

+ code2 <<=1;

+ if(dest[idx+j]) code2 |= 1;

+ }

+

+ Dbprintf("XSF(%02d)%02x:%d (%08x%08x)",version,unknown,number,code,code2);

+ if (ledcontrol)

+ LED_D_OFF();

+ }

+ // if we're only looking for one tag

+ if (findone){

+ //*high = hi;

+ //*low = lo;

+ LED_A_OFF();

+ return;

+ }

+

+ //hi=0;

+ //lo=0;

+ found=0;

+ }

+

+ }

+ WDT_HIT();

+}

+

+/*------------------------------

+ * T5555/T5557/T5567 routines

+ *------------------------------

+ */

+

+/* T55x7 configuration register definitions */

+#define T55x7_POR_DELAY 0x00000001

+#define T55x7_ST_TERMINATOR 0x00000008

+#define T55x7_PWD 0x00000010

+#define T55x7_MAXBLOCK_SHIFT 5

+#define T55x7_AOR 0x00000200

+#define T55x7_PSKCF_RF_2 0

+#define T55x7_PSKCF_RF_4 0x00000400

+#define T55x7_PSKCF_RF_8 0x00000800

+#define T55x7_MODULATION_DIRECT 0

+#define T55x7_MODULATION_PSK1 0x00001000

+#define T55x7_MODULATION_PSK2 0x00002000

+#define T55x7_MODULATION_PSK3 0x00003000

+#define T55x7_MODULATION_FSK1 0x00004000

+#define T55x7_MODULATION_FSK2 0x00005000

+#define T55x7_MODULATION_FSK1a 0x00006000

+#define T55x7_MODULATION_FSK2a 0x00007000

+#define T55x7_MODULATION_MANCHESTER 0x00008000

+#define T55x7_MODULATION_BIPHASE 0x00010000

+#define T55x7_BITRATE_RF_8 0

+#define T55x7_BITRATE_RF_16 0x00040000

+#define T55x7_BITRATE_RF_32 0x00080000

+#define T55x7_BITRATE_RF_40 0x000C0000

+#define T55x7_BITRATE_RF_50 0x00100000

+#define T55x7_BITRATE_RF_64 0x00140000

+#define T55x7_BITRATE_RF_100 0x00180000

+#define T55x7_BITRATE_RF_128 0x001C0000

+

+/* T5555 (Q5) configuration register definitions */

+#define T5555_ST_TERMINATOR 0x00000001

+#define T5555_MAXBLOCK_SHIFT 0x00000001

+#define T5555_MODULATION_MANCHESTER 0

+#define T5555_MODULATION_PSK1 0x00000010

+#define T5555_MODULATION_PSK2 0x00000020

+#define T5555_MODULATION_PSK3 0x00000030

+#define T5555_MODULATION_FSK1 0x00000040

+#define T5555_MODULATION_FSK2 0x00000050

+#define T5555_MODULATION_BIPHASE 0x00000060

+#define T5555_MODULATION_DIRECT 0x00000070

+#define T5555_INVERT_OUTPUT 0x00000080

+#define T5555_PSK_RF_2 0

+#define T5555_PSK_RF_4 0x00000100

+#define T5555_PSK_RF_8 0x00000200

+#define T5555_USE_PWD 0x00000400

+#define T5555_USE_AOR 0x00000800

+#define T5555_BITRATE_SHIFT 12

+#define T5555_FAST_WRITE 0x00004000

+#define T5555_PAGE_SELECT 0x00008000

+

+/*

+ * Relevant times in microsecond

+ * To compensate antenna falling times shorten the write times

+ * and enlarge the gap ones.

+ */

+#define START_GAP 250

+#define WRITE_GAP 160

+#define WRITE_0 144 // 192

+#define WRITE_1 400 // 432 for T55x7; 448 for E5550

+

+// Write one bit to card

+void T55xxWriteBit(int bit)

+{

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+ if (bit == 0)

+ SpinDelayUs(WRITE_0);

+ else

+ SpinDelayUs(WRITE_1);

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ SpinDelayUs(WRITE_GAP);

+}

+

+// Write one card block in page 0, no lock

+void T55xxWriteBlock(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t PwdMode)

+{

+ unsigned int i;

+

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ // And for the tag to fully power up

+ SpinDelay(150);

+

+ // Now start writting

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ SpinDelayUs(START_GAP);

+

+ // Opcode

+ T55xxWriteBit(1);

+ T55xxWriteBit(0); //Page 0

+ if (PwdMode == 1){

+ // Pwd

+ for (i = 0x80000000; i != 0; i >>= 1)

+ T55xxWriteBit(Pwd & i);

+ }

+ // Lock bit

+ T55xxWriteBit(0);

+

+ // Data

+ for (i = 0x80000000; i != 0; i >>= 1)

+ T55xxWriteBit(Data & i);

+

+ // Block

+ for (i = 0x04; i != 0; i >>= 1)

+ T55xxWriteBit(Block & i);

+

+ // Now perform write (nominal is 5.6 ms for T55x7 and 18ms for E5550,

+ // so wait a little more)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+ SpinDelay(20);

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+}

+

+// Read one card block in page 0

+void T55xxReadBlock(uint32_t Block, uint32_t Pwd, uint8_t PwdMode)

+{

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int m=0, i=0;

+

+ m = sizeof(BigBuf);

+ // Clear destination buffer before sending the command

+ memset(dest, 128, m);

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ LED_D_ON();

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ // And for the tag to fully power up

+ SpinDelay(150);

+

+ // Now start writting

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ SpinDelayUs(START_GAP);

+

+ // Opcode

+ T55xxWriteBit(1);

+ T55xxWriteBit(0); //Page 0

+ if (PwdMode == 1){

+ // Pwd

+ for (i = 0x80000000; i != 0; i >>= 1)

+ T55xxWriteBit(Pwd & i);

+ }

+ // Lock bit

+ T55xxWriteBit(0);

+ // Block

+ for (i = 0x04; i != 0; i >>= 1)

+ T55xxWriteBit(Block & i);

+

+ // Turn field on to read the response

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Now do the acquisition

+ i = 0;

+ for(;;) {

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ }

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ // we don't care about actual value, only if it's more or less than a

+ // threshold essentially we capture zero crossings for later analysis

+ // if(dest[i] < 127) dest[i] = 0; else dest[i] = 1;

+ i++;

+ if (i >= m) break;

+ }

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ LED_D_OFF();

+ DbpString("DONE!");

+}

+

+// Read card traceability data (page 1)

+void T55xxReadTrace(void){

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int m=0, i=0;

+

+ m = sizeof(BigBuf);

+ // Clear destination buffer before sending the command

+ memset(dest, 128, m);

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ LED_D_ON();

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ // And for the tag to fully power up

+ SpinDelay(150);

+

+ // Now start writting

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

+ SpinDelayUs(START_GAP);

+

+ // Opcode

+ T55xxWriteBit(1);

+ T55xxWriteBit(1); //Page 1

+

+ // Turn field on to read the response

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Now do the acquisition

+ i = 0;

+ for(;;) {

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ }

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ i++;

+ if (i >= m) break;

+ }

+

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ LED_D_OFF();

+ DbpString("DONE!");

+}

+

+/*-------------- Cloning routines -----------*/

+// Copy HID id to card and setup block 0 config

+void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT)

+{

+ int data1=0, data2=0, data3=0, data4=0, data5=0, data6=0; //up to six blocks for long format

+ int last_block = 0;

+

+ if (longFMT){

+ // Ensure no more than 84 bits supplied

+ if (hi2>0xFFFFF) {

+ DbpString("Tags can only have 84 bits.");

+ return;

+ }

+ // Build the 6 data blocks for supplied 84bit ID

+ last_block = 6;

+ data1 = 0x1D96A900; // load preamble (1D) & long format identifier (9E manchester encoded)

+ for (int i=0;i<4;i++) {

+ if (hi2 & (1<<(19-i)))

+ data1 |= (1<<(((3-i)*2)+1)); // 1 -> 10

+ else

+ data1 |= (1<<((3-i)*2)); // 0 -> 01

+ }

+

+ data2 = 0;

+ for (int i=0;i<16;i++) {

+ if (hi2 & (1<<(15-i)))

+ data2 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data2 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ data3 = 0;

+ for (int i=0;i<16;i++) {

+ if (hi & (1<<(31-i)))

+ data3 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data3 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ data4 = 0;

+ for (int i=0;i<16;i++) {

+ if (hi & (1<<(15-i)))

+ data4 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data4 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ data5 = 0;

+ for (int i=0;i<16;i++) {

+ if (lo & (1<<(31-i)))

+ data5 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data5 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ data6 = 0;

+ for (int i=0;i<16;i++) {

+ if (lo & (1<<(15-i)))

+ data6 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data6 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+ else {

+ // Ensure no more than 44 bits supplied

+ if (hi>0xFFF) {

+ DbpString("Tags can only have 44 bits.");

+ return;

+ }

+

+ // Build the 3 data blocks for supplied 44bit ID

+ last_block = 3;

+

+ data1 = 0x1D000000; // load preamble

+

+ for (int i=0;i<12;i++) {

+ if (hi & (1<<(11-i)))

+ data1 |= (1<<(((11-i)*2)+1)); // 1 -> 10

+ else

+ data1 |= (1<<((11-i)*2)); // 0 -> 01

+ }

+

+ data2 = 0;

+ for (int i=0;i<16;i++) {

+ if (lo & (1<<(31-i)))

+ data2 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data2 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ data3 = 0;

+ for (int i=0;i<16;i++) {

+ if (lo & (1<<(15-i)))

+ data3 |= (1<<(((15-i)*2)+1)); // 1 -> 10

+ else

+ data3 |= (1<<((15-i)*2)); // 0 -> 01

+ }

+

+ LED_D_ON();

+ // Program the data blocks for supplied ID

+ // and the block 0 for HID format

+ T55xxWriteBlock(data1,1,0,0);

+ T55xxWriteBlock(data2,2,0,0);

+ T55xxWriteBlock(data3,3,0,0);

+

+ if (longFMT) { // if long format there are 6 blocks

+ T55xxWriteBlock(data4,4,0,0);

+ T55xxWriteBlock(data5,5,0,0);

+ T55xxWriteBlock(data6,6,0,0);

+ }

+

+ // Config for HID (RF/50, FSK2a, Maxblock=3 for short/6 for long)

+ T55xxWriteBlock(T55x7_BITRATE_RF_50 |

+ T55x7_MODULATION_FSK2a |

+ last_block << T55x7_MAXBLOCK_SHIFT,

+ 0,0,0);

+

+ LED_D_OFF();

+

+ DbpString("DONE!");

+}

+

+void CopyIOtoT55x7(uint32_t hi, uint32_t lo, uint8_t longFMT)

+{

+ int data1=0, data2=0; //up to six blocks for long format

+

+ data1 = hi; // load preamble

+ data2 = lo;

+

+ LED_D_ON();

+ // Program the data blocks for supplied ID

+ // and the block 0 for HID format

+ T55xxWriteBlock(data1,1,0,0);

+ T55xxWriteBlock(data2,2,0,0);

+

+ //Config Block

+ T55xxWriteBlock(0x00147040,0,0,0);

+ LED_D_OFF();

+

+ DbpString("DONE!");

+}

+

+// Define 9bit header for EM410x tags

+#define EM410X_HEADER 0x1FF

+#define EM410X_ID_LENGTH 40

+

+void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo)

+{

+ int i, id_bit;

+ uint64_t id = EM410X_HEADER;

+ uint64_t rev_id = 0; // reversed ID

+ int c_parity[4]; // column parity

+ int r_parity = 0; // row parity

+ uint32_t clock = 0;

+

+ // Reverse ID bits given as parameter (for simpler operations)

+ for (i = 0; i < EM410X_ID_LENGTH; ++i) {

+ if (i < 32) {

+ rev_id = (rev_id << 1) | (id_lo & 1);

+ id_lo >>= 1;

+ } else {

+ rev_id = (rev_id << 1) | (id_hi & 1);

+ id_hi >>= 1;

+ }

+

+ for (i = 0; i < EM410X_ID_LENGTH; ++i) {

+ id_bit = rev_id & 1;

+

+ if (i % 4 == 0) {

+ // Don't write row parity bit at start of parsing

+ if (i)

+ id = (id << 1) | r_parity;

+ // Start counting parity for new row

+ r_parity = id_bit;

+ } else {

+ // Count row parity

+ r_parity ^= id_bit;

+ }

+

+ // First elements in column?

+ if (i < 4)

+ // Fill out first elements

+ c_parity[i] = id_bit;

+ else

+ // Count column parity

+ c_parity[i % 4] ^= id_bit;

+

+ // Insert ID bit

+ id = (id << 1) | id_bit;

+ rev_id >>= 1;

+ }

+

+ // Insert parity bit of last row

+ id = (id << 1) | r_parity;

+

+ // Fill out column parity at the end of tag

+ for (i = 0; i < 4; ++i)

+ id = (id << 1) | c_parity[i];

+

+ // Add stop bit

+ id <<= 1;

+

+ Dbprintf("Started writing %s tag ...", card ? "T55x7":"T5555");

+ LED_D_ON();

+

+ // Write EM410x ID

+ T55xxWriteBlock((uint32_t)(id >> 32), 1, 0, 0);

+ T55xxWriteBlock((uint32_t)id, 2, 0, 0);

+

+ // Config for EM410x (RF/64, Manchester, Maxblock=2)

+ if (card) {

+ // Clock rate is stored in bits 8-15 of the card value

+ clock = (card & 0xFF00) >> 8;

+ Dbprintf("Clock rate: %d", clock);

+ switch (clock)

+ {

+ case 32:

+ clock = T55x7_BITRATE_RF_32;

+ break;

+ case 16:

+ clock = T55x7_BITRATE_RF_16;

+ break;

+ case 0:

+ // A value of 0 is assumed to be 64 for backwards-compatibility

+ // Fall through...

+ case 64:

+ clock = T55x7_BITRATE_RF_64;

+ break;

+ default:

+ Dbprintf("Invalid clock rate: %d", clock);

+ return;

+ }

+

+ // Writing configuration for T55x7 tag

+ T55xxWriteBlock(clock |

+ T55x7_MODULATION_MANCHESTER |

+ 2 << T55x7_MAXBLOCK_SHIFT,

+ 0, 0, 0);

+ }

+ else

+ // Writing configuration for T5555(Q5) tag

+ T55xxWriteBlock(0x1F << T5555_BITRATE_SHIFT |

+ T5555_MODULATION_MANCHESTER |

+ 2 << T5555_MAXBLOCK_SHIFT,

+ 0, 0, 0);

+

+ LED_D_OFF();

+ Dbprintf("Tag %s written with 0x%08x%08x\n", card ? "T55x7":"T5555",

+ (uint32_t)(id >> 32), (uint32_t)id);

+}

+

+// Clone Indala 64-bit tag by UID to T55x7

+void CopyIndala64toT55x7(int hi, int lo)

+{

+

+ //Program the 2 data blocks for supplied 64bit UID

+ // and the block 0 for Indala64 format

+ T55xxWriteBlock(hi,1,0,0);

+ T55xxWriteBlock(lo,2,0,0);

+ //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=2)

+ T55xxWriteBlock(T55x7_BITRATE_RF_32 |

+ T55x7_MODULATION_PSK1 |

+ 2 << T55x7_MAXBLOCK_SHIFT,

+ 0, 0, 0);

+ //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=2;Inverse data)

+// T5567WriteBlock(0x603E1042,0);

+

+ DbpString("DONE!");

+

+}

+

+void CopyIndala224toT55x7(int uid1, int uid2, int uid3, int uid4, int uid5, int uid6, int uid7)

+{

+

+ //Program the 7 data blocks for supplied 224bit UID

+ // and the block 0 for Indala224 format

+ T55xxWriteBlock(uid1,1,0,0);

+ T55xxWriteBlock(uid2,2,0,0);

+ T55xxWriteBlock(uid3,3,0,0);

+ T55xxWriteBlock(uid4,4,0,0);

+ T55xxWriteBlock(uid5,5,0,0);

+ T55xxWriteBlock(uid6,6,0,0);

+ T55xxWriteBlock(uid7,7,0,0);

+ //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=7)

+ T55xxWriteBlock(T55x7_BITRATE_RF_32 |

+ T55x7_MODULATION_PSK1 |

+ 7 << T55x7_MAXBLOCK_SHIFT,

+ 0,0,0);

+ //Alternative config for Indala (Extended mode;RF/32;PSK1 with RF/2;Maxblock=7;Inverse data)

+// T5567WriteBlock(0x603E10E2,0);

+

+ DbpString("DONE!");

+

+}

+

+#define abs(x) ( ((x)<0) ? -(x) : (x) )

+#define max(x,y) ( x<y ? y:x)

+

+int DemodPCF7931(uint8_t **outBlocks) {

+ uint8_t BitStream[256];

+ uint8_t Blocks[8][16];

+ uint8_t *GraphBuffer = (uint8_t *)BigBuf;

+ int GraphTraceLen = sizeof(BigBuf);

+ int i, j, lastval, bitidx, half_switch;

+ int clock = 64;

+ int tolerance = clock / 8;

+ int pmc, block_done;

+ int lc, warnings = 0;

+ int num_blocks = 0;

+ int lmin=128, lmax=128;

+ uint8_t dir;

+

+ AcquireRawAdcSamples125k(0);

+

+ lmin = 64;

+ lmax = 192;

+

+ i = 2;

+

+ /* Find first local max/min */

+ if(GraphBuffer[1] > GraphBuffer[0]) {

+ while(i < GraphTraceLen) {

+ if( !(GraphBuffer[i] > GraphBuffer[i-1]) && GraphBuffer[i] > lmax)

+ break;

+ i++;

+ }

+ dir = 0;

+ }

+ else {

+ while(i < GraphTraceLen) {

+ if( !(GraphBuffer[i] < GraphBuffer[i-1]) && GraphBuffer[i] < lmin)

+ break;

+ i++;

+ }

+ dir = 1;

+ }

+

+ lastval = i++;

+ half_switch = 0;

+ pmc = 0;

+ block_done = 0;

+

+ for (bitidx = 0; i < GraphTraceLen; i++)

+ {

+ if ( (GraphBuffer[i-1] > GraphBuffer[i] && dir == 1 && GraphBuffer[i] > lmax) || (GraphBuffer[i-1] < GraphBuffer[i] && dir == 0 && GraphBuffer[i] < lmin))

+ {

+ lc = i - lastval;

+ lastval = i;

+

+ // Switch depending on lc length:

+ // Tolerance is 1/8 of clock rate (arbitrary)

+ if (abs(lc-clock/4) < tolerance) {

+ // 16T0

+ if((i - pmc) == lc) { /* 16T0 was previous one */

+ /* It's a PMC ! */

+ i += (128+127+16+32+33+16)-1;

+ lastval = i;

+ pmc = 0;

+ block_done = 1;

+ }

+ else {

+ pmc = i;

+ }

+ } else if (abs(lc-clock/2) < tolerance) {

+ // 32TO

+ if((i - pmc) == lc) { /* 16T0 was previous one */

+ /* It's a PMC ! */

+ i += (128+127+16+32+33)-1;

+ lastval = i;

+ pmc = 0;

+ block_done = 1;

+ }

+ else if(half_switch == 1) {

+ BitStream[bitidx++] = 0;

+ half_switch = 0;

+ }

+ else

+ half_switch++;

+ } else if (abs(lc-clock) < tolerance) {

+ // 64TO

+ BitStream[bitidx++] = 1;

+ } else {

+ // Error

+ warnings++;

+ if (warnings > 10)

+ {

+ Dbprintf("Error: too many detection errors, aborting.");

+ return 0;

+ }

+

+ if(block_done == 1) {

+ if(bitidx == 128) {

+ for(j=0; j<16; j++) {

+ Blocks[num_blocks][j] = 128*BitStream[j*8+7]+

+ 64*BitStream[j*8+6]+

+ 32*BitStream[j*8+5]+

+ 16*BitStream[j*8+4]+

+ 8*BitStream[j*8+3]+

+ 4*BitStream[j*8+2]+

+ 2*BitStream[j*8+1]+

+ BitStream[j*8];

+ }

+ num_blocks++;

+ }

+ bitidx = 0;

+ block_done = 0;

+ half_switch = 0;

+ }

+ if (GraphBuffer[i-1] > GraphBuffer[i]) dir=0;

+ else dir = 1;

+ }

+ if(bitidx==255)

+ bitidx=0;

+ warnings = 0;

+ if(num_blocks == 4) break;

+ }

+ memcpy(outBlocks, Blocks, 16*num_blocks);

+ return num_blocks;

+}

+

+int IsBlock0PCF7931(uint8_t *Block) {

+ // Assume RFU means 0 :)

+ if((memcmp(Block, "\x00\x00\x00\x00\x00\x00\x00\x01", 8) == 0) && memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) // PAC enabled

+ return 1;

+ if((memcmp(Block+9, "\x00\x00\x00\x00\x00\x00\x00", 7) == 0) && Block[7] == 0) // PAC disabled, can it *really* happen ?

+ return 1;

+ return 0;

+}

+

+int IsBlock1PCF7931(uint8_t *Block) {

+ // Assume RFU means 0 :)

+ if(Block[10] == 0 && Block[11] == 0 && Block[12] == 0 && Block[13] == 0)

+ if((Block[14] & 0x7f) <= 9 && Block[15] <= 9)

+ return 1;

+

+ return 0;

+}

+

+#define ALLOC 16

+

+void ReadPCF7931() {

+ uint8_t Blocks[8][17];

+ uint8_t tmpBlocks[4][16];

+ int i, j, ind, ind2, n;

+ int num_blocks = 0;

+ int max_blocks = 8;

+ int ident = 0;

+ int error = 0;

+ int tries = 0;

+

+ memset(Blocks, 0, 8*17*sizeof(uint8_t));

+

+ do {

+ memset(tmpBlocks, 0, 4*16*sizeof(uint8_t));

+ n = DemodPCF7931((uint8_t**)tmpBlocks);

+ if(!n)

+ error++;

+ if(error==10 && num_blocks == 0) {

+ Dbprintf("Error, no tag or bad tag");

+ return;

+ }

+ else if (tries==20 || error==10) {

+ Dbprintf("Error reading the tag");

+ Dbprintf("Here is the partial content");

+ goto end;

+ }

+

+ for(i=0; i<n; i++)

+ Dbprintf("(dbg) %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",

+ tmpBlocks[i][0], tmpBlocks[i][1], tmpBlocks[i][2], tmpBlocks[i][3], tmpBlocks[i][4], tmpBlocks[i][5], tmpBlocks[i][6], tmpBlocks[i][7],

+ tmpBlocks[i][8], tmpBlocks[i][9], tmpBlocks[i][10], tmpBlocks[i][11], tmpBlocks[i][12], tmpBlocks[i][13], tmpBlocks[i][14], tmpBlocks[i][15]);

+ if(!ident) {

+ for(i=0; i<n; i++) {

+ if(IsBlock0PCF7931(tmpBlocks[i])) {

+ // Found block 0 ?

+ if(i < n-1 && IsBlock1PCF7931(tmpBlocks[i+1])) {

+ // Found block 1!

+ // \o/

+ ident = 1;

+ memcpy(Blocks[0], tmpBlocks[i], 16);

+ Blocks[0][ALLOC] = 1;

+ memcpy(Blocks[1], tmpBlocks[i+1], 16);

+ Blocks[1][ALLOC] = 1;

+ max_blocks = max((Blocks[1][14] & 0x7f), Blocks[1][15]) + 1;

+ // Debug print

+ Dbprintf("(dbg) Max blocks: %d", max_blocks);

+ num_blocks = 2;

+ // Handle following blocks

+ for(j=i+2, ind2=2; j!=i; j++, ind2++, num_blocks++) {

+ if(j==n) j=0;

+ if(j==i) break;

+ memcpy(Blocks[ind2], tmpBlocks[j], 16);

+ Blocks[ind2][ALLOC] = 1;

+ }

+ break;

+ }

+ else {

+ for(i=0; i<n; i++) { // Look for identical block in known blocks

+ if(memcmp(tmpBlocks[i], "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16)) { // Block is not full of 00

+ for(j=0; j<max_blocks; j++) {

+ if(Blocks[j][ALLOC] == 1 && !memcmp(tmpBlocks[i], Blocks[j], 16)) {

+ // Found an identical block

+ for(ind=i-1,ind2=j-1; ind >= 0; ind--,ind2--) {

+ if(ind2 < 0)

+ ind2 = max_blocks;

+ if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found

+ // Dbprintf("Tmp %d -> Block %d", ind, ind2);

+ memcpy(Blocks[ind2], tmpBlocks[ind], 16);

+ Blocks[ind2][ALLOC] = 1;

+ num_blocks++;

+ if(num_blocks == max_blocks) goto end;

+ }

+ for(ind=i+1,ind2=j+1; ind < n; ind++,ind2++) {

+ if(ind2 > max_blocks)

+ ind2 = 0;

+ if(!Blocks[ind2][ALLOC]) { // Block ind2 not already found

+ // Dbprintf("Tmp %d -> Block %d", ind, ind2);

+ memcpy(Blocks[ind2], tmpBlocks[ind], 16);

+ Blocks[ind2][ALLOC] = 1;

+ num_blocks++;

+ if(num_blocks == max_blocks) goto end;

+ }

+ tries++;

+ if (BUTTON_PRESS()) return;

+ } while (num_blocks != max_blocks);

+end:

+ Dbprintf("-----------------------------------------");

+ Dbprintf("Memory content:");

+ Dbprintf("-----------------------------------------");

+ for(i=0; i<max_blocks; i++) {

+ if(Blocks[i][ALLOC]==1)

+ Dbprintf("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",

+ Blocks[i][0], Blocks[i][1], Blocks[i][2], Blocks[i][3], Blocks[i][4], Blocks[i][5], Blocks[i][6], Blocks[i][7],

+ Blocks[i][8], Blocks[i][9], Blocks[i][10], Blocks[i][11], Blocks[i][12], Blocks[i][13], Blocks[i][14], Blocks[i][15]);

+ else

+ Dbprintf("<missing block %d>", i);

+ }

+ Dbprintf("-----------------------------------------");

+

+ return ;

+}

+

+//-----------------------------------

+// EM4469 / EM4305 routines

+//-----------------------------------

+#define FWD_CMD_LOGIN 0xC //including the even parity, binary mirrored

+#define FWD_CMD_WRITE 0xA

+#define FWD_CMD_READ 0x9

+#define FWD_CMD_DISABLE 0x5

+

+uint8_t forwardLink_data[64]; //array of forwarded bits

+uint8_t * forward_ptr; //ptr for forward message preparation

+uint8_t fwd_bit_sz; //forwardlink bit counter

+uint8_t * fwd_write_ptr; //forwardlink bit pointer

+

+//====================================================================

+// prepares command bits

+// see EM4469 spec

+//====================================================================

+//--------------------------------------------------------------------

+uint8_t Prepare_Cmd( uint8_t cmd ) {

+ //--------------------------------------------------------------------

+

+ *forward_ptr++ = 0; //start bit

+ *forward_ptr++ = 0; //second pause for 4050 code

+

+ *forward_ptr++ = cmd;

+ cmd >>= 1;

+ *forward_ptr++ = cmd;

+ cmd >>= 1;

+ *forward_ptr++ = cmd;

+ cmd >>= 1;

+ *forward_ptr++ = cmd;

+

+ return 6; //return number of emited bits

+}

+

+//====================================================================

+// prepares address bits

+// see EM4469 spec

+//====================================================================

+

+//--------------------------------------------------------------------

+uint8_t Prepare_Addr( uint8_t addr ) {

+ //--------------------------------------------------------------------

+

+ register uint8_t line_parity;

+

+ uint8_t i;

+ line_parity = 0;

+ for(i=0;i<6;i++) {

+ *forward_ptr++ = addr;

+ line_parity ^= addr;

+ addr >>= 1;

+ }

+

+ *forward_ptr++ = (line_parity & 1);

+

+ return 7; //return number of emited bits

+}

+

+//====================================================================

+// prepares data bits intreleaved with parity bits

+// see EM4469 spec

+//====================================================================

+

+//--------------------------------------------------------------------

+uint8_t Prepare_Data( uint16_t data_low, uint16_t data_hi) {

+ //--------------------------------------------------------------------

+

+ register uint8_t line_parity;

+ register uint8_t column_parity;

+ register uint8_t i, j;

+ register uint16_t data;

+

+ data = data_low;

+ column_parity = 0;

+

+ for(i=0; i<4; i++) {

+ line_parity = 0;

+ for(j=0; j<8; j++) {

+ line_parity ^= data;

+ column_parity ^= (data & 1) << j;

+ *forward_ptr++ = data;

+ data >>= 1;

+ }

+ *forward_ptr++ = line_parity;

+ if(i == 1)

+ data = data_hi;

+ }

+

+ for(j=0; j<8; j++) {

+ *forward_ptr++ = column_parity;

+ column_parity >>= 1;

+ }

+ *forward_ptr = 0;

+

+ return 45; //return number of emited bits

+}

+

+//====================================================================

+// Forward Link send function

+// Requires: forwarLink_data filled with valid bits (1 bit per byte)

+// fwd_bit_count set with number of bits to be sent

+//====================================================================

+void SendForward(uint8_t fwd_bit_count) {

+

+ fwd_write_ptr = forwardLink_data;

+ fwd_bit_sz = fwd_bit_count;

+

+ LED_D_ON();

+

+ //Field on

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);

+

+ // Give it a bit of time for the resonant antenna to settle.

+ // And for the tag to fully power up

+ SpinDelay(150);

+

+ // force 1st mod pulse (start gap must be longer for 4305)

+ fwd_bit_sz--; //prepare next bit modulation

+ fwd_write_ptr++;

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ SpinDelayUs(55*8); //55 cycles off (8us each)for 4305

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on

+ SpinDelayUs(16*8); //16 cycles on (8us each)

+

+ // now start writting

+ while(fwd_bit_sz-- > 0) { //prepare next bit modulation

+ if(((*fwd_write_ptr++) & 1) == 1)

+ SpinDelayUs(32*8); //32 cycles at 125Khz (8us each)

+ else {

+ //These timings work for 4469/4269/4305 (with the 55*8 above)

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ SpinDelayUs(23*8); //16-4 cycles off (8us each)

+ FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_READER);//field on

+ SpinDelayUs(9*8); //16 cycles on (8us each)

+ }

+}

+

+void EM4xLogin(uint32_t Password) {

+

+ uint8_t fwd_bit_count;

+

+ forward_ptr = forwardLink_data;

+ fwd_bit_count = Prepare_Cmd( FWD_CMD_LOGIN );

+ fwd_bit_count += Prepare_Data( Password&0xFFFF, Password>>16 );

+

+ SendForward(fwd_bit_count);

+

+ //Wait for command to complete

+ SpinDelay(20);

+

+}

+

+void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {

+

+ uint8_t fwd_bit_count;

+ uint8_t *dest = (uint8_t *)BigBuf;

+ int m=0, i=0;

+

+ //If password mode do login

+ if (PwdMode == 1) EM4xLogin(Pwd);

+

+ forward_ptr = forwardLink_data;

+ fwd_bit_count = Prepare_Cmd( FWD_CMD_READ );

+ fwd_bit_count += Prepare_Addr( Address );

+

+ m = sizeof(BigBuf);

+ // Clear destination buffer before sending the command

+ memset(dest, 128, m);

+ // Connect the A/D to the peak-detected low-frequency path.

+ SetAdcMuxFor(GPIO_MUXSEL_LOPKD);

+ // Now set up the SSC to get the ADC samples that are now streaming at us.

+ FpgaSetupSsc();

+

+ SendForward(fwd_bit_count);

+

+ // Now do the acquisition

+ i = 0;

+ for(;;) {

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {

+ AT91C_BASE_SSC->SSC_THR = 0x43;

+ }

+ if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) {

+ dest[i] = (uint8_t)AT91C_BASE_SSC->SSC_RHR;

+ i++;

+ if (i >= m) break;

+ }

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ LED_D_OFF();

+}

+

+void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode) {

+

+ uint8_t fwd_bit_count;

+

+ //If password mode do login

+ if (PwdMode == 1) EM4xLogin(Pwd);

+

+ forward_ptr = forwardLink_data;

+ fwd_bit_count = Prepare_Cmd( FWD_CMD_WRITE );

+ fwd_bit_count += Prepare_Addr( Address );

+ fwd_bit_count += Prepare_Data( Data&0xFFFF, Data>>16 );

+

+ SendForward(fwd_bit_count);

+

+ //Wait for write to complete

+ SpinDelay(20);

+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off

+ LED_D_OFF();

+}