X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/db8296025f78251ffa2c28d6fe995bbb0a386c77..refs/pull/227/head:/armsrc/lfops.c?ds=sidebyside diff --git a/armsrc/lfops.c b/armsrc/lfops.c index 3acecd6e..75aa1342 100644 --- a/armsrc/lfops.c +++ b/armsrc/lfops.c @@ -17,7 +17,7 @@ #include "lfdemod.h" #include "lfsampling.h" #include "protocols.h" -#include "usb_cdc.h" //test +#include "usb_cdc.h" // for usb_poll_validate_length /** * Function to do a modulation and then get samples. @@ -37,6 +37,8 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint sample_config sc = { 0,0,1, divisor_used, 0}; setSamplingConfig(&sc); + //clear read buffer + BigBuf_Clear_keep_EM(); /* Make sure the tag is reset */ FpgaDownloadAndGo(FPGA_BITSTREAM_LF); @@ -73,8 +75,6 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint DoAcquisition_config(false); } - - /* blank r/w tag data stream ...0000000000000000 01111111 1010101010101010101010101010101010101010101010101010101010101010 @@ -214,8 +214,6 @@ void ReadTItag(void) } } - - void WriteTIbyte(uint8_t b) { int i = 0; @@ -250,7 +248,7 @@ void AcquireTiType(void) // clear buffer uint32_t *BigBuf = (uint32_t *)BigBuf_get_addr(); - memset(BigBuf,0,BigBuf_max_traceLen()/sizeof(uint32_t)); + BigBuf_Clear_ext(false); // Set up the synchronous serial port AT91C_BASE_PIOA->PIO_PDR = GPIO_SSC_DIN; @@ -312,16 +310,11 @@ void AcquireTiType(void) } } - - - // 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) { - - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); if(crc == 0) { crc = update_crc16(crc, (idlo)&0xff); @@ -386,7 +379,7 @@ void WriteTItag(uint32_t idhi, uint32_t idlo, uint16_t crc) AcquireTiType(); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - DbpString("Now use tiread to check"); + DbpString("Now use `lf ti read` to check"); } void SimulateTagLowFrequency(int period, int gap, int ledcontrol) @@ -402,14 +395,15 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) 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) + #define SHORT_COIL() LOW(GPIO_SSC_DOUT) + #define OPEN_COIL() HIGH(GPIO_SSC_DOUT) i = 0; for(;;) { //wait until SSC_CLK goes HIGH while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) { if(BUTTON_PRESS() || (usb_poll_validate_length() )) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); return; } @@ -427,8 +421,9 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) LED_D_OFF(); //wait until SSC_CLK goes LOW while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) { - if(BUTTON_PRESS()) { + if(BUTTON_PRESS() || (usb_poll_validate_length() )) { DbpString("Stopped"); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); return; } WDT_HIT(); @@ -443,6 +438,7 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) SpinDelayUs(gap); } } + } } @@ -649,6 +645,19 @@ static void biphaseSimBit(uint8_t c, int *n, uint8_t clock, uint8_t *phase) memset(dest+(*n), c ^ *phase, clock); *phase ^= 1; } + *n += clock; +} + +static void stAskSimBit(int *n, uint8_t clock) { + uint8_t *dest = BigBuf_get_addr(); + uint8_t halfClk = clock/2; + //ST = .5 high .5 low 1.5 high .5 low 1 high + memset(dest+(*n), 1, halfClk); + memset(dest+(*n) + halfClk, 0, halfClk); + memset(dest+(*n) + clock, 1, clock + halfClk); + memset(dest+(*n) + clock*2 + halfClk, 0, halfClk); + memset(dest+(*n) + clock*3, 1, clock); + *n += clock*4; } // args clock, ask/man or askraw, invert, transmission separator @@ -666,7 +675,7 @@ void CmdASKsimTag(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream) for (i=0; i0 && size==96){ - // Index map - // 0 10 20 30 40 50 60 - // | | | | | | | - // 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96 - // ----------------------------------------------------------------------------- - // 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1 - // premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96 - // |---26 bit---| |-----117----||-------------142-------------| - // b = format bit len, o = odd parity of last 3 bits - // f = facility code, c = card number - // w = wiegand parity - // (26 bit format shown) - - //get raw ID before removing parities - uint32_t rawLo = bytebits_to_byte(dest+idx+64,32); - uint32_t rawHi = bytebits_to_byte(dest+idx+32,32); - uint32_t rawHi2 = bytebits_to_byte(dest+idx,32); - - size = removeParity(dest, idx+8, 4, 1, 88); - // ok valid card found! - - // Index map - // 0 10 20 30 40 50 60 - // | | | | | | | - // 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456 - // ----------------------------------------------------------------------------- - // 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000 - // bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx - // |26 bit| |-117--| |-----142------| - // b = format bit len, o = odd parity of last 3 bits - // f = facility code, c = card number - // w = wiegand parity - // (26 bit format shown) - - uint32_t fc = 0; - uint32_t cardnum = 0; - uint32_t code1 = 0; - uint32_t code2 = 0; - uint8_t fmtLen = bytebits_to_byte(dest,8); - if (fmtLen==26){ - fc = bytebits_to_byte(dest+9, 8); - cardnum = bytebits_to_byte(dest+17, 16); - code1 = bytebits_to_byte(dest+8,fmtLen); - Dbprintf("AWID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo); - } else { - cardnum = bytebits_to_byte(dest+8+(fmtLen-17), 16); - if (fmtLen>32){ - code1 = bytebits_to_byte(dest+8,fmtLen-32); - code2 = bytebits_to_byte(dest+8+(fmtLen-32),32); - Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x%08x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo); - } else{ - code1 = bytebits_to_byte(dest+8,fmtLen); - Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo); - } - } - if (findone){ - if (ledcontrol) LED_A_OFF(); - return; + if (idx<=0 || size!=96) continue; + // Index map + // 0 10 20 30 40 50 60 + // | | | | | | | + // 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96 + // ----------------------------------------------------------------------------- + // 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1 + // premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96 + // |---26 bit---| |-----117----||-------------142-------------| + // b = format bit len, o = odd parity of last 3 bits + // f = facility code, c = card number + // w = wiegand parity + // (26 bit format shown) + + //get raw ID before removing parities + uint32_t rawLo = bytebits_to_byte(dest+idx+64,32); + uint32_t rawHi = bytebits_to_byte(dest+idx+32,32); + uint32_t rawHi2 = bytebits_to_byte(dest+idx,32); + + size = removeParity(dest, idx+8, 4, 1, 88); + if (size != 66) continue; + // ok valid card found! + + // Index map + // 0 10 20 30 40 50 60 + // | | | | | | | + // 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456 + // ----------------------------------------------------------------------------- + // 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000 + // bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx + // |26 bit| |-117--| |-----142------| + // b = format bit len, o = odd parity of last 3 bits + // f = facility code, c = card number + // w = wiegand parity + // (26 bit format shown) + + uint32_t fc = 0; + uint32_t cardnum = 0; + uint32_t code1 = 0; + uint32_t code2 = 0; + uint8_t fmtLen = bytebits_to_byte(dest,8); + if (fmtLen==26){ + fc = bytebits_to_byte(dest+9, 8); + cardnum = bytebits_to_byte(dest+17, 16); + code1 = bytebits_to_byte(dest+8,fmtLen); + Dbprintf("AWID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo); + } else { + cardnum = bytebits_to_byte(dest+8+(fmtLen-17), 16); + if (fmtLen>32){ + code1 = bytebits_to_byte(dest+8,fmtLen-32); + code2 = bytebits_to_byte(dest+8+(fmtLen-32),32); + Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x%08x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo); + } else{ + code1 = bytebits_to_byte(dest+8,fmtLen); + Dbprintf("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x, Raw: %08x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo); } - // reset } + if (findone){ + if (ledcontrol) LED_A_OFF(); + break; + } + // reset idx = 0; WDT_HIT(); } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -945,6 +955,8 @@ void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol) int clk=0, invert=0, errCnt=0, maxErr=20; uint32_t hi=0; uint64_t lo=0; + //clear read buffer + BigBuf_Clear_keep_EM(); // Configure to go in 125Khz listen mode LFSetupFPGAForADC(95, true); @@ -985,13 +997,14 @@ void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol) if (ledcontrol) LED_A_OFF(); *high=lo>>32; *low=lo & 0xFFFFFFFF; - return; + break; } } WDT_HIT(); hi = lo = size = idx = 0; clk = invert = errCnt = 0; } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -1004,6 +1017,8 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) uint8_t version=0; uint8_t facilitycode=0; uint16_t number=0; + //clear read buffer + BigBuf_Clear_keep_EM(); // Configure to go in 125Khz listen mode LFSetupFPGAForADC(95, true); @@ -1048,7 +1063,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) //LED_A_OFF(); *high=code; *low=code2; - return; + break; } code=code2=0; version=facilitycode=0; @@ -1057,6 +1072,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) WDT_HIT(); } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -1064,11 +1080,8 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) /*------------------------------ * T5555/T5557/T5567/T5577 routines *------------------------------ - */ - -/* NOTE: T55x7/T5555 configuration register definitions moved to protocols.h */ - -/* + * NOTE: T55x7/T5555 configuration register definitions moved to protocols.h + * * Relevant communication times in microsecond * To compensate antenna falling times shorten the write times * and enlarge the gap ones. @@ -1078,7 +1091,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) #define WRITE_GAP 20*8 // was 160 // SPEC: 1*8 to 20*8 - typ 10*8 (or 10fc) #define WRITE_0 18*8 // was 144 // SPEC: 16*8 to 32*8 - typ 24*8 (or 24fc) #define WRITE_1 50*8 // was 400 // SPEC: 48*8 to 64*8 - typ 56*8 (or 56fc) 432 for T55x7; 448 for E5550 -#define READ_GAP 26*8 +#define READ_GAP 15*8 void TurnReadLFOn(int delay) { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); @@ -1100,7 +1113,7 @@ void T55xxWriteBit(int bit) { void T55xxResetRead(void) { LED_A_ON(); //clear buffer now so it does not interfere with timing later - BigBuf_Clear_ext(false); + BigBuf_Clear_keep_EM(); // Set up FPGA, 125kHz LFSetupFPGAForADC(95, true); @@ -1255,7 +1268,6 @@ void T55xxWakeUp(uint32_t Pwd){ void WriteT55xx(uint32_t *blockdata, uint8_t startblock, uint8_t numblocks) { // write last block first and config block last (if included) for (uint8_t i = numblocks+startblock; i > startblock; i--) { - //Dbprintf("write- Blk: %d, d:%08X",i-1,blockdata[i-1]); T55xxWriteBlockExt(blockdata[i-1],i-1,0,0); } } @@ -1263,7 +1275,6 @@ void WriteT55xx(uint32_t *blockdata, uint8_t startblock, uint8_t numblocks) { // Copy HID id to card and setup block 0 config void CopyHIDtoT55x7(uint32_t hi2, uint32_t hi, uint32_t lo, uint8_t longFMT) { uint32_t data[] = {0,0,0,0,0,0,0}; - //int data1=0, data2=0, data3=0, data4=0, data5=0, data6=0; //up to six blocks for long format uint8_t last_block = 0; if (longFMT) { @@ -1347,12 +1358,21 @@ void CopyIndala224toT55x7(uint32_t uid1, uint32_t uid2, uint32_t uid3, uint32_t //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=7) data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (7 << T55x7_MAXBLOCK_SHIFT); //TODO add selection of chip for Q5 or T55x7 - // data[0] = (((32-2)/2)<>1)<>1) << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | 2 << T5555_MAXBLOCK_SHIFT; + // Program the data blocks for supplied ID and the block 0 config + WriteT55xx(data, 0, 3); + LED_D_OFF(); + cmd_send(CMD_ACK,0,0,0,0,0); +} // Define 9bit header for EM410x tags #define EM410X_HEADER 0x1FF @@ -1418,7 +1438,7 @@ void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo) { LED_D_ON(); // Write EM410x ID - uint32_t data[] = {0, id>>32, id & 0xFFFFFFFF}; + uint32_t data[] = {0, (uint32_t)(id>>32), (uint32_t)(id & 0xFFFFFFFF)}; clock = (card & 0xFF00) >> 8; clock = (clock == 0) ? 64 : clock; @@ -1450,7 +1470,6 @@ void WriteEM410x(uint32_t card, uint32_t id_hi, uint32_t id_lo) { #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 @@ -1470,7 +1489,6 @@ uint8_t * fwd_write_ptr; //forwardlink bit pointer // WRITE_0 = 23*8 , 9*8 SpinDelayUs(23*8); uint8_t Prepare_Cmd( uint8_t cmd ) { - //-------------------------------------------------------------------- *forward_ptr++ = 0; //start bit *forward_ptr++ = 0; //second pause for 4050 code @@ -1490,10 +1508,7 @@ uint8_t Prepare_Cmd( uint8_t cmd ) { // prepares address bits // see EM4469 spec //==================================================================== - -//-------------------------------------------------------------------- uint8_t Prepare_Addr( uint8_t addr ) { - //-------------------------------------------------------------------- register uint8_t line_parity; @@ -1514,10 +1529,7 @@ uint8_t Prepare_Addr( uint8_t addr ) { // 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; @@ -1559,31 +1571,27 @@ void SendForward(uint8_t fwd_bit_count) { fwd_write_ptr = forwardLink_data; fwd_bit_sz = fwd_bit_count; - LED_D_ON(); - - // Set up FPGA, 125kHz + // Set up FPGA, 125kHz or 95 divisor LFSetupFPGAForADC(95, true); // 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 + WaitUS(55*8); //55 cycles off (8us each)for 4305 //another reader has 37 here... FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on - SpinDelayUs(16*8); //16 cycles on (8us each) + WaitUS(18*8); //18 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) + WaitUS(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 + WaitUS(23*8); //23 cycles off (8us each) FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD);//field on - SpinDelayUs(9*8); //16 cycles on (8us each) + WaitUS(18*8); //18 cycles on (8us each) } } } @@ -1600,19 +1608,17 @@ void EM4xLogin(uint32_t Password) { //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 = BigBuf_get_addr(); - uint16_t bufferlength = BigBuf_max_traceLen(); - uint32_t i = 0; // Clear destination buffer before sending the command - memset(dest, 0x80, bufferlength); + BigBuf_Clear_ext(false); + LED_A_ON(); + StartTicks(); //If password mode do login if (PwdMode == 1) EM4xLogin(Pwd); @@ -1620,36 +1626,29 @@ void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode) { fwd_bit_count = Prepare_Cmd( FWD_CMD_READ ); fwd_bit_count += Prepare_Addr( Address ); - // 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); - + WaitUS(400); // 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 >= bufferlength) break; - } - } + DoPartialAcquisition(20, true, 6000); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off + LED_A_OFF(); cmd_send(CMD_ACK,0,0,0,0,0); - LED_D_OFF(); } -void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode) { - +void EM4xWriteWord(uint32_t flag, uint32_t Data, uint32_t Pwd) { + + bool PwdMode = (flag & 0xF); + uint8_t Address = (flag >> 8) & 0xFF; uint8_t fwd_bit_count; + //clear buffer now so it does not interfere with timing later + BigBuf_Clear_ext(false); + + LED_A_ON(); + StartTicks(); //If password mode do login - if (PwdMode == 1) EM4xLogin(Pwd); + if (PwdMode) EM4xLogin(Pwd); forward_ptr = forwardLink_data; fwd_bit_count = Prepare_Cmd( FWD_CMD_WRITE ); @@ -1659,7 +1658,72 @@ void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode SendForward(fwd_bit_count); //Wait for write to complete - SpinDelay(20); + //SpinDelay(10); + + WaitUS(6500); + //Capture response if one exists + DoPartialAcquisition(20, true, 6000); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off - LED_D_OFF(); + LED_A_OFF(); + cmd_send(CMD_ACK,0,0,0,0,0); +} +/* +Reading a COTAG. + +COTAG needs the reader to send a startsequence and the card has an extreme slow datarate. +because of this, we can "sample" the data signal but we interpreate it to Manchester direct. + +READER START SEQUENCE: +burst 800 us, gap 2.2 msecs +burst 3.6 msecs gap 2.2 msecs +burst 800 us gap 2.2 msecs +pulse 3.6 msecs + +This triggers a COTAG tag to response +*/ +void Cotag(uint32_t arg0) { + +#define OFF { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); WaitUS(2035); } +#define ON(x) { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); WaitUS((x)); } + + uint8_t rawsignal = arg0 & 0xF; + + LED_A_ON(); + + // Switching to LF image on FPGA. This might empty BigBuff + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + + //clear buffer now so it does not interfere with timing later + BigBuf_Clear_ext(false); + + // Set up FPGA, 132kHz to power up the tag + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 89); + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); + + // 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(); + + // start clock - 1.5ticks is 1us + StartTicks(); + + //send COTAG start pulse + ON(740) OFF + ON(3330) OFF + ON(740) OFF + ON(1000) + + switch(rawsignal) { + case 0: doCotagAcquisition(50000); break; + case 1: doCotagAcquisitionManchester(); break; + case 2: DoAcquisition_config(TRUE); break; + } + + // Turn the field off + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off + cmd_send(CMD_ACK,0,0,0,0,0); + LED_A_OFF(); }