X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/7669409547dcf1148a9651a7a911076a103a6691..e8924be8bac6e8ddc91d1950368ef51c454a6e55:/armsrc/lfops.c?ds=sidebyside diff --git a/armsrc/lfops.c b/armsrc/lfops.c index 2079f263..f3bbbf84 100644 --- a/armsrc/lfops.c +++ b/armsrc/lfops.c @@ -4,7 +4,7 @@ // the license. //----------------------------------------------------------------------------- // Miscellaneous routines for low frequency tag operations. -// Tags supported here so far are Texas Instruments (TI), HID +// Tags supported here so far are Texas Instruments (TI), HID, EM4x05, EM410x // Also routines for raw mode reading/simulating of LF waveform //----------------------------------------------------------------------------- @@ -28,51 +28,103 @@ */ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint32_t period_1, uint8_t *command) { + // start timer + StartTicks(); - int divisor_used = 95; // 125 KHz - // see if 'h' was specified + // use lf config settings + sample_config *sc = getSamplingConfig(); - if (command[strlen((char *) command) - 1] == 'h') - divisor_used = 88; // 134.8 KHz - - sample_config sc = { 0,0,1, divisor_used, 0}; - setSamplingConfig(&sc); - //clear read buffer - BigBuf_Clear_keep_EM(); - - /* Make sure the tag is reset */ + // Make sure the tag is reset FpgaDownloadAndGo(FPGA_BITSTREAM_LF); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(2500); + WaitMS(2500); - LFSetupFPGAForADC(sc.divisor, 1); + // clear read buffer (after fpga bitstream loaded...) + BigBuf_Clear_keep_EM(); - // And a little more time for the tag to fully power up - SpinDelay(2000); + // power on + LFSetupFPGAForADC(sc->divisor, 1); + // And a little more time for the tag to fully power up + WaitMS(2000); + // if delay_off = 0 then just bitbang 1 = antenna on 0 = off for respective periods. + bool bitbang = delay_off == 0; // now modulate the reader field - while(*command != '\0' && *command != ' ') { + + if (bitbang) { + // HACK it appears the loop and if statements take up about 7us so adjust waits accordingly... + uint8_t hack_cnt = 7; + if (period_0 < hack_cnt || period_1 < hack_cnt) { + DbpString("Warning periods cannot be less than 7us in bit bang mode"); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + return; + } + + // hack2 needed--- it appears to take about 8-16us to turn the antenna back on + // leading to ~ 1 to 2 125khz samples extra in every off period + // so we should test for last 0 before next 1 and reduce period_0 by this extra amount... + // but is this time different for every antenna or other hw builds??? more testing needed + + // prime cmd_len to save time comparing strings while modulating + int cmd_len = 0; + while(command[cmd_len] != '\0' && command[cmd_len] != ' ') + cmd_len++; + + int counter = 0; + bool off = false; + for (counter = 0; counter < cmd_len; counter++) { + // if cmd = 0 then turn field off + if (command[counter] == '0') { + // if field already off leave alone (affects timing otherwise) + if (off == false) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + off = true; + } + // note we appear to take about 7us to switch over (or run the if statements/loop...) + WaitUS(period_0-hack_cnt); + // else if cmd = 1 then turn field on + } else { + // if field already on leave alone (affects timing otherwise) + if (off) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); + LED_D_ON(); + off = false; + } + // note we appear to take about 7us to switch over (or run the if statements/loop...) + WaitUS(period_1-hack_cnt); + } + } + } else { // old mode of cmd read using delay as off period + while(*command != '\0' && *command != ' ') { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + LED_D_OFF(); + WaitUS(delay_off); + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc->divisor); + FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); + LED_D_ON(); + if(*(command++) == '0') { + WaitUS(period_0); + } else { + WaitUS(period_1); + } + } FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); - SpinDelayUs(delay_off); - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc.divisor); - - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); - LED_D_ON(); - if(*(command++) == '0') - SpinDelayUs(period_0); - else - SpinDelayUs(period_1); + WaitUS(delay_off); + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc->divisor); } - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - LED_D_OFF(); - SpinDelayUs(delay_off); - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc.divisor); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); // now do the read - DoAcquisition_config(false); + DoAcquisition_config(false, 0); + + // Turn off antenna + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + // tell client we are done + cmd_send(CMD_ACK,0,0,0,0,0); } /* blank r/w tag data stream @@ -387,7 +439,8 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) int i; uint8_t *tab = BigBuf_get_addr(); - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + //note FpgaDownloadAndGo destroys the bigbuf so be sure this is called before now... + //FpgaDownloadAndGo(FPGA_BITSTREAM_LF); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_EDGE_DETECT); AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT | GPIO_SSC_CLK; @@ -401,12 +454,19 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) i = 0; for(;;) { //wait until SSC_CLK goes HIGH + int ii = 0; while(!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK)) { - if(BUTTON_PRESS() || (usb_poll_validate_length() )) { - DbpString("Stopped"); - return; + //only check every 1000th time (usb_poll_validate_length on some systems was too slow) + if ( ii == 1000 ) { + if (BUTTON_PRESS() || usb_poll_validate_length() ) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + DbpString("Stopped"); + return; + } + ii=0; } WDT_HIT(); + ii++; } if (ledcontrol) LED_D_ON(); @@ -418,13 +478,20 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) if (ledcontrol) LED_D_OFF(); + ii=0; //wait until SSC_CLK goes LOW while(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_CLK) { - if(BUTTON_PRESS()) { - DbpString("Stopped"); - return; + //only check every 1000th time (usb_poll_validate_length on some systems was too slow) + if ( ii == 1000 ) { + if (BUTTON_PRESS() || usb_poll_validate_length() ) { + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + DbpString("Stopped"); + return; + } + ii=0; } WDT_HIT(); + ii++; } i++; @@ -436,6 +503,7 @@ void SimulateTagLowFrequency(int period, int gap, int ledcontrol) SpinDelayUs(gap); } } + } } @@ -542,6 +610,9 @@ void CmdHIDsimTAG(int hi, int lo, int ledcontrol) DbpString("Tags can only have 44 bits. - USE lf simfsk for larger tags"); return; } + // set LF so we don't kill the bigbuf we are setting with simulation data. + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + fc(0,&n); // special start of frame marker containing invalid bit sequences fc(8, &n); fc(8, &n); // invalid @@ -592,6 +663,9 @@ void CmdFSKsimTAG(uint16_t arg1, uint16_t arg2, size_t size, uint8_t *BitStream) uint8_t clk = arg2 & 0xFF; uint8_t invert = (arg2 >> 8) & 1; + // set LF so we don't kill the bigbuf we are setting with simulation data. + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + for (i=0; i> 8) & 1; + // set LF so we don't kill the bigbuf we are setting with simulation data. + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + if (encoding==2){ //biphase uint8_t phase=0; for (i=0; i0 && lo>0 && (size==96 || size==192)){ // go over previously decoded manchester data and decode into usable tag ID @@ -840,13 +921,15 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol) if (ledcontrol) LED_A_OFF(); *high = hi; *low = lo; - return; + break; } // reset } hi2 = hi = lo = idx = 0; WDT_HIT(); } + + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -856,7 +939,7 @@ void CmdAWIDdemodFSK(int findone, int *high, int *low, int ledcontrol) { uint8_t *dest = BigBuf_get_addr(); size_t size; - int idx=0; + int idx=0, dummyIdx=0; //clear read buffer BigBuf_Clear_keep_EM(); // Configure to go in 125Khz listen mode @@ -870,7 +953,7 @@ void CmdAWIDdemodFSK(int findone, int *high, int *low, int ledcontrol) DoAcquisition_default(-1,true); // FSK demodulator size = 50*128*2; //big enough to catch 2 sequences of largest format - idx = AWIDdemodFSK(dest, &size); + idx = AWIDdemodFSK(dest, &size, &dummyIdx); if (idx<=0 || size!=96) continue; // Index map @@ -931,12 +1014,13 @@ void CmdAWIDdemodFSK(int findone, int *high, int *low, int ledcontrol) } if (findone){ if (ledcontrol) LED_A_OFF(); - return; + break; } // reset idx = 0; WDT_HIT(); } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -991,13 +1075,14 @@ 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(); } @@ -1010,6 +1095,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) uint8_t version=0; uint8_t facilitycode=0; uint16_t number=0; + int dummyIdx=0; //clear read buffer BigBuf_Clear_keep_EM(); // Configure to go in 125Khz listen mode @@ -1021,7 +1107,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) DoAcquisition_default(-1,true); //fskdemod and get start index WDT_HIT(); - idx = IOdemodFSK(dest, BigBuf_max_traceLen()); + idx = IOdemodFSK(dest, BigBuf_max_traceLen(), &dummyIdx); if (idx<0) continue; //valid tag found @@ -1056,7 +1142,7 @@ 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; @@ -1065,6 +1151,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) WDT_HIT(); } + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); DbpString("Stopped"); if (ledcontrol) LED_A_OFF(); } @@ -1088,7 +1175,7 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) void TurnReadLFOn(int delay) { FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); // Give it a bit of time for the resonant antenna to settle. - SpinDelayUs(delay); //155*8 //50*8 + WaitUS(delay); //155*8 //50*8 } // Write one bit to card @@ -1098,7 +1185,7 @@ void T55xxWriteBit(int bit) { else TurnReadLFOn(WRITE_1); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelayUs(WRITE_GAP); + WaitUS(WRITE_GAP); } // Send T5577 reset command then read stream (see if we can identify the start of the stream) @@ -1109,20 +1196,22 @@ void T55xxResetRead(void) { // Set up FPGA, 125kHz LFSetupFPGAForADC(95, true); - + StartTicks(); + // make sure tag is fully powered up... + WaitMS(5); + // Trigger T55x7 in mode. FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelayUs(START_GAP); + WaitUS(START_GAP); // reset tag - op code 00 T55xxWriteBit(0); T55xxWriteBit(0); - // Turn field on to read the response TurnReadLFOn(READ_GAP); // Acquisition - doT55x7Acquisition(BigBuf_max_traceLen()); + DoPartialAcquisition(0, true, BigBuf_max_traceLen(), 0); // Turn the field off FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off @@ -1135,19 +1224,24 @@ void T55xxWriteBlockExt(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t arg LED_A_ON(); bool PwdMode = arg & 0x1; uint8_t Page = (arg & 0x2)>>1; + bool testMode = arg & 0x4; uint32_t i = 0; // Set up FPGA, 125kHz LFSetupFPGAForADC(95, true); - + StartTicks(); + // make sure tag is fully powered up... + WaitMS(5); // Trigger T55x7 in mode. FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelayUs(START_GAP); + WaitUS(START_GAP); - // Opcode 10 - T55xxWriteBit(1); - T55xxWriteBit(Page); //Page 0 - if (PwdMode){ + if (testMode) Dbprintf("TestMODE"); + // Std Opcode 10 + T55xxWriteBit(testMode ? 0 : 1); + T55xxWriteBit(testMode ? 1 : Page); //Page 0 + + if (PwdMode) { // Send Pwd for (i = 0x80000000; i != 0; i >>= 1) T55xxWriteBit(Pwd & i); @@ -1165,11 +1259,31 @@ void T55xxWriteBlockExt(uint32_t Data, uint32_t Block, uint32_t Pwd, uint8_t arg // Perform write (nominal is 5.6 ms for T55x7 and 18ms for E5550, // so wait a little more) - TurnReadLFOn(20 * 1000); + + // "there is a clock delay before programming" + // - programming takes ~5.6ms for t5577 ~18ms for E5550 or t5567 + // so we should wait 1 clock + 5.6ms then read response? + // but we need to know we are dealing with t5577 vs t5567 vs e5550 (or q5) marshmellow... + if (testMode) { + //TESTMODE TIMING TESTS: + // <566us does nothing + // 566-568 switches between wiping to 0s and doing nothing + // 5184 wipes and allows 1 block to be programmed. + // indefinite power on wipes and then programs all blocks with bitshifted data sent. + TurnReadLFOn(5184); + + } else { + TurnReadLFOn(20 * 1000); //could attempt to do a read to confirm write took // as the tag should repeat back the new block // until it is reset, but to confirm it we would - // need to know the current block 0 config mode + // need to know the current block 0 config mode for + // modulation clock an other details to demod the response... + // response should be (for t55x7) a 0 bit then (ST if on) + // block data written in on repeat until reset. + + //DoPartialAcquisition(20, true, 12000); + } // turn field off FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); @@ -1188,7 +1302,7 @@ void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) { bool PwdMode = arg0 & 0x1; uint8_t Page = (arg0 & 0x2) >> 1; uint32_t i = 0; - bool RegReadMode = (Block == 0xFF); + bool RegReadMode = (Block == 0xFF);//regular read mode //clear buffer now so it does not interfere with timing later BigBuf_Clear_ext(false); @@ -1198,10 +1312,12 @@ void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) { // Set up FPGA, 125kHz to power up the tag LFSetupFPGAForADC(95, true); - + StartTicks(); + // make sure tag is fully powered up... + WaitMS(5); // Trigger T55x7 Direct Access Mode with start gap FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelayUs(START_GAP); + WaitUS(START_GAP); // Opcode 1[page] T55xxWriteBit(1); @@ -1221,10 +1337,13 @@ void T55xxReadBlock(uint16_t arg0, uint8_t Block, uint32_t Pwd) { T55xxWriteBit(Block & i); // Turn field on to read the response - TurnReadLFOn(READ_GAP); + // 137*8 seems to get to the start of data pretty well... + // but we want to go past the start and let the repeating data settle in... + TurnReadLFOn(210*8); // Acquisition - doT55x7Acquisition(12000); + // Now do the acquisition + DoPartialAcquisition(0, true, 12000, 0); // Turn the field off FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off @@ -1238,10 +1357,13 @@ void T55xxWakeUp(uint32_t Pwd){ // Set up FPGA, 125kHz LFSetupFPGAForADC(95, true); + StartTicks(); + // make sure tag is fully powered up... + WaitMS(5); // Trigger T55x7 Direct Access Mode FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelayUs(START_GAP); + WaitUS(START_GAP); // Opcode 10 T55xxWriteBit(1); @@ -1347,10 +1469,10 @@ void CopyIndala224toT55x7(uint32_t uid1, uint32_t uid2, uint32_t uid3, uint32_t //Program the 7 data blocks for supplied 224bit UID uint32_t data[] = {0, uid1, uid2, uid3, uid4, uid5, uid6, uid7}; // and the block 0 for Indala224 format - //Config for Indala (RF/32;PSK1 with RF/2;Maxblock=7) - data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK1 | (7 << T55x7_MAXBLOCK_SHIFT); + //Config for Indala (RF/32;PSK2 with RF/2;Maxblock=7) + data[0] = T55x7_BITRATE_RF_32 | T55x7_MODULATION_PSK2 | (7 << T55x7_MAXBLOCK_SHIFT); //TODO add selection of chip for Q5 or T55x7 - // data[0] = (((32-2)/2)<>1)<>1; //n = (RF-2)/2 - data[0] = (clock << T5555_BITRATE_SHIFT) | T5555_MODULATION_MANCHESTER | (2 << T5555_MAXBLOCK_SHIFT); + data[0] = T5555_SET_BITRATE(clock) | T5555_MODULATION_MANCHESTER | (2 << T5555_MAXBLOCK_SHIFT); } WriteT55xx(data, 0, 3); @@ -1563,29 +1684,27 @@ 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 + 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) + 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) } } } @@ -1607,13 +1726,12 @@ void EM4xLogin(uint32_t Password) { 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 BigBuf_Clear_ext(false); + LED_A_ON(); + StartTicks(); //If password mode do login if (PwdMode == 1) EM4xLogin(Pwd); @@ -1621,36 +1739,29 @@ 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, 1000); + 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 ); @@ -1660,7 +1771,72 @@ 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, 1000); + 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, 0); break; + } + + // Turn the field off + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); // field off + cmd_send(CMD_ACK,0,0,0,0,0); + LED_A_OFF(); }