X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3e134b4c20a5528b8264cd87d3fdebd0b2df6fd9..c649c43389d23fef7d28541739c89d22ad1f5250:/armsrc/legicrf.c diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index a725c0bc..b1c6b196 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -7,18 +7,10 @@ //----------------------------------------------------------------------------- // LEGIC RF simulation code //----------------------------------------------------------------------------- - -#include "proxmark3.h" -#include "apps.h" -#include "util.h" -#include "string.h" - #include "legicrf.h" -#include "legic_prng.h" -#include "crc.h" static struct legic_frame { - int bits; + uint8_t bits; uint32_t data; } current_frame; @@ -40,21 +32,21 @@ static int legic_reqresp_drift; AT91PS_TC timer; AT91PS_TC prng_timer; -static void setup_timer(void) -{ - /* Set up Timer 1 to use for measuring time between pulses. Since we're bit-banging - * this it won't be terribly accurate but should be good enough. - */ +/* +static void setup_timer(void) { + // Set up Timer 1 to use for measuring time between pulses. Since we're bit-banging + // this it won't be terribly accurate but should be good enough. + // AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC1); timer = AT91C_BASE_TC1; timer->TC_CCR = AT91C_TC_CLKDIS; timer->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK; timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - /* - * Set up Timer 2 to use for measuring time between frames in - * tag simulation mode. Runs 4x faster as Timer 1 - */ + // + // Set up Timer 2 to use for measuring time between frames in + // tag simulation mode. Runs 4x faster as Timer 1 + // AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_TC2); prng_timer = AT91C_BASE_TC2; prng_timer->TC_CCR = AT91C_TC_CLKDIS; @@ -62,51 +54,121 @@ static void setup_timer(void) prng_timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; } -/* At TIMER_CLOCK3 (MCK/32) */ -#define RWD_TIME_1 150 /* RWD_TIME_PAUSE off, 80us on = 100us */ -#define RWD_TIME_0 90 /* RWD_TIME_PAUSE off, 40us on = 60us */ -#define RWD_TIME_PAUSE 30 /* 20us */ -#define RWD_TIME_FUZZ 20 /* rather generous 13us, since the peak detector + hysteresis fuzz quite a bit */ -#define TAG_TIME_BIT 150 /* 100us for every bit */ -#define TAG_TIME_WAIT 490 /* time from RWD frame end to tag frame start, experimentally determined */ + AT91C_BASE_PMC->PMC_PCER |= (0x1 << 12) | (0x1 << 13) | (0x1 << 14); + AT91C_BASE_TCB->TCB_BMR = AT91C_TCB_TC0XC0S_NONE | AT91C_TCB_TC1XC1S_TIOA0 | AT91C_TCB_TC2XC2S_NONE; + + // fast clock + AT91C_BASE_TC0->TC_CCR = AT91C_TC_CLKDIS; // timer disable + AT91C_BASE_TC0->TC_CMR = AT91C_TC_CLKS_TIMER_DIV3_CLOCK | // MCK(48MHz)/32 -- tick=1.5mks + AT91C_TC_WAVE | AT91C_TC_WAVESEL_UP_AUTO | AT91C_TC_ACPA_CLEAR | + AT91C_TC_ACPC_SET | AT91C_TC_ASWTRG_SET; + AT91C_BASE_TC0->TC_RA = 1; + AT91C_BASE_TC0->TC_RC = 0xBFFF + 1; // 0xC000 + +*/ + +// At TIMER_CLOCK3 (MCK/32) +// testing calculating in (us) microseconds. +#define RWD_TIME_1 120 // READER_TIME_PAUSE 20us off, 80us on = 100us 80 * 1.5 == 120ticks +#define RWD_TIME_0 60 // READER_TIME_PAUSE 20us off, 40us on = 60us 40 * 1.5 == 60ticks +#define RWD_TIME_PAUSE 30 // 20us == 20 * 1.5 == 30ticks */ +#define TAG_BIT_PERIOD 142 // 100us == 100 * 1.5 == 150ticks +#define TAG_FRAME_WAIT 495 // 330us from READER frame end to TAG frame start. 330 * 1.5 == 495 + +#define RWD_TIME_FUZZ 20 // rather generous 13us, since the peak detector + hysteresis fuzz quite a bit #define SIM_DIVISOR 586 /* prng_time/SIM_DIVISOR count prng needs to be forwared */ #define SIM_SHIFT 900 /* prng_time+SIM_SHIFT shift of delayed start */ -#define SESSION_IV 0x55 #define OFFSET_LOG 1024 #define FUZZ_EQUAL(value, target, fuzz) ((value) > ((target)-(fuzz)) && (value) < ((target)+(fuzz))) +#ifndef SHORT_COIL +# define SHORT_COIL LOW(GPIO_SSC_DOUT); +#endif +#ifndef OPEN_COIL +# define OPEN_COIL HIGH(GPIO_SSC_DOUT); +#endif + +// Pause pulse, off in 20us / 30ticks, +// ONE / ZERO bit pulse, +// one == 80us / 120ticks +// zero == 40us / 60ticks +#ifndef COIL_PULSE +# define COIL_PULSE(x) \ + do { \ + SHORT_COIL; \ + WaitTicks( (RWD_TIME_PAUSE) ); \ + OPEN_COIL; \ + WaitTicks((x)); \ + } while (0) +#endif + +// ToDo: define a meaningful maximum size for auth_table. The bigger this is, the lower will be the available memory for traces. +// Historically it used to be FREE_BUFFER_SIZE, which was 2744. +#define LEGIC_CARD_MEMSIZE 1024 +static uint8_t* cardmem; + +static void frame_append_bit(struct legic_frame * const f, uint8_t bit) { + // Overflow, won't happen + if (f->bits >= 31) return; + + f->data |= (bit << f->bits); + f->bits++; +} + +static void frame_clean(struct legic_frame * const f) { + f->data = 0; + f->bits = 0; +} + +// Prng works when waiting in 99.1us cycles. +// and while sending/receiving in bit frames (100, 60) +/*static void CalibratePrng( uint32_t time){ + // Calculate Cycles based on timer 100us + uint32_t i = (time - sendFrameStop) / 100 ; + + // substract cycles of finished frames + int k = i - legic_prng_count()+1; + + // substract current frame length, rewind to beginning + if ( k > 0 ) + legic_prng_forward(k); +} +*/ + /* Generate Keystream */ -static uint32_t get_key_stream(int skip, int count) -{ - uint32_t key=0; int i; +uint32_t get_key_stream(int skip, int count) { + uint32_t key = 0; + int i; - /* Use int to enlarge timer tc to 32bit */ + // Use int to enlarge timer tc to 32bit legic_prng_bc += prng_timer->TC_CV; - prng_timer->TC_CCR = AT91C_TC_SWTRG; + + // reset the prng timer. + ResetTimer(prng_timer); /* If skip == -1, forward prng time based */ if(skip == -1) { - i = (legic_prng_bc+SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */ + i = (legic_prng_bc + SIM_SHIFT)/SIM_DIVISOR; /* Calculate Cycles based on timer */ i -= legic_prng_count(); /* substract cycles of finished frames */ - i -= count; /* substract current frame length, rewidn to bedinning */ + i -= count; /* substract current frame length, rewind to beginning */ legic_prng_forward(i); } else { legic_prng_forward(skip); } - /* Write Time Data into LOG */ - uint8_t *BigBuf = BigBuf_get_addr(); i = (count == 6) ? -1 : legic_read_count; - BigBuf[OFFSET_LOG+128+i] = legic_prng_count(); - BigBuf[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff; - BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff; - BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff; - BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff; - BigBuf[OFFSET_LOG+384+i] = count; + /* Write Time Data into LOG */ + // uint8_t *BigBuf = BigBuf_get_addr(); + // BigBuf[OFFSET_LOG+128+i] = legic_prng_count(); + // BigBuf[OFFSET_LOG+256+i*4] = (legic_prng_bc >> 0) & 0xff; + // BigBuf[OFFSET_LOG+256+i*4+1] = (legic_prng_bc >> 8) & 0xff; + // BigBuf[OFFSET_LOG+256+i*4+2] = (legic_prng_bc >>16) & 0xff; + // BigBuf[OFFSET_LOG+256+i*4+3] = (legic_prng_bc >>24) & 0xff; + // BigBuf[OFFSET_LOG+384+i] = count; /* Generate KeyStream */ for(i=0; iPIO_CODR = GPIO_SSC_DOUT; - AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; - AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; - - /* Use time to crypt frame */ - if(crypt) { - legic_prng_forward(2); /* TAG_TIME_WAIT -> shift by 2 */ - int i; int key = 0; - for(i=0; iPIO_OER = GPIO_SSC_DOUT; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; + + /* Use time to crypt frame */ + if(crypt) { + legic_prng_forward(2); /* TAG_FRAME_WAIT -> shift by 2 */ + response ^= legic_prng_get_bits(bits); + } + + /* Wait for the frame start */ + WaitUS( TAG_FRAME_WAIT ); + + uint8_t bit = 0; + for(int i = 0; i < bits; i++) { + + bit = response & 1; + response >>= 1; - /* Wait for the frame start */ - while(timer->TC_CV < (TAG_TIME_WAIT - 30)) ; - - int i; - for(i=0; iTC_CV + TAG_TIME_BIT; - int bit = response & 1; - response = response >> 1; - if(bit) - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - else - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - - while(timer->TC_CV < nextbit) ; + if (bit) + HIGH(GPIO_SSC_DOUT); + else + LOW(GPIO_SSC_DOUT); + + WaitUS(100); } - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; + LOW(GPIO_SSC_DOUT); } /* Send a frame in reader mode, the FPGA must have been set up by * LegicRfReader */ -static void frame_send_rwd(uint32_t data, int bits) -{ - /* Start clock */ - timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ +void frame_sendAsReader(uint32_t data, uint8_t bits){ - int i; - for(i=0; iTC_CV; - int pause_end = starttime + RWD_TIME_PAUSE, bit_end; - int bit = data & 1; - data = data >> 1; - - if(bit ^ legic_prng_get_bit()) - bit_end = starttime + RWD_TIME_1; + uint32_t starttime = GET_TICKS, send = 0; + uint16_t mask = 1; + + // xor lsfr onto data. + send = data ^ legic_prng_get_bits(bits); + + for (; mask < BITMASK(bits); mask <<= 1) { + if (send & mask) + COIL_PULSE(RWD_TIME_1); else - bit_end = starttime + RWD_TIME_0; - - - /* RWD_TIME_PAUSE time off, then some time on, so that the complete bit time is - * RWD_TIME_x, where x is the bit to be transmitted */ - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - while(timer->TC_CV < pause_end) ; - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - legic_prng_forward(1); /* bit duration is longest. use this time to forward the lfsr */ - - while(timer->TC_CV < bit_end); + COIL_PULSE(RWD_TIME_0); } - /* One final pause to mark the end of the frame */ - int pause_end = timer->TC_CV + RWD_TIME_PAUSE; - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - while(timer->TC_CV < pause_end) ; - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - - - /* Reset the timer, to measure time until the start of the tag frame */ - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ + // Final pause to mark the end of the frame + COIL_PULSE(0); + + // log + uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1), BYTEx(send, 0), BYTEx(send, 1)}; + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, TRUE); } /* Receive a frame from the card in reader emulation mode, the FPGA and - * timer must have been set up by LegicRfReader and frame_send_rwd. + * timer must have been set up by LegicRfReader and frame_sendAsReader. * * The LEGIC RF protocol from card to reader does not include explicit * frame start/stop information or length information. The reader must @@ -214,289 +252,293 @@ static void frame_send_rwd(uint32_t data, int bits) * for edges. Count the edges in each bit interval. If they are approximately * 0 this was a 0-bit, if they are approximately equal to the number of edges * expected for a 212kHz subcarrier, this was a 1-bit. For timing we use the - * timer that's still running from frame_send_rwd in order to get a synchronization + * timer that's still running from frame_sendAsReader in order to get a synchronization * with the frame that we just sent. * * FIXME: Because we're relying on the hysteresis to just do the right thing * the range is severely reduced (and you'll probably also need a good antenna). * So this should be fixed some time in the future for a proper receiver. */ -static void frame_receive_rwd(struct legic_frame * const f, int bits, int crypt) -{ - uint32_t the_bit = 1; /* Use a bitmask to save on shifts */ - uint32_t data=0; - int i, old_level=0, edges=0; - int next_bit_at = TAG_TIME_WAIT; - - if(bits > 32) { - bits = 32; - } +static void frame_receiveAsReader(struct legic_frame * const f, uint8_t bits) { + if ( bits > 32 ) return; + + uint8_t i = bits, edges = 0; + uint32_t the_bit = 1, next_bit_at = 0, data = 0; + uint32_t old_level = 0; + volatile uint32_t level = 0; + + frame_clean(f); + AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; - - /* we have some time now, precompute the cipher - * since we cannot compute it on the fly while reading */ + + // calibrate the prng. legic_prng_forward(2); - - if(crypt) { - for(i=0; iTC_CV < next_bit_at) ; - - next_bit_at += TAG_TIME_BIT; - - for(i=0; iTC_CV < next_bit_at) { - int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); - if(level != old_level) - edges++; + while ( GET_TICKS < next_bit_at) { + + level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); + + if (level != old_level) + ++edges; + old_level = level; - } - next_bit_at += TAG_TIME_BIT; + } + + next_bit_at += TAG_BIT_PERIOD; - if(edges > 20 && edges < 60) { /* expected are 42 edges */ + // We expect 42 edges (ONE) + if ( edges > 20 ) data ^= the_bit; - } - the_bit <<= 1; + + the_bit <<= 1; } + // output f->data = data; f->bits = bits; - - /* Reset the timer, to synchronize the next frame */ - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ -} - -static void frame_append_bit(struct legic_frame * const f, int bit) -{ - if (f->bits >= 31) - return; /* Overflow, won't happen */ - - f->data |= (bit << f->bits); - f->bits++; -} - -static void frame_clean(struct legic_frame * const f) -{ - f->data = 0; - f->bits = 0; + + // log + uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)}; + LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE); } -static uint32_t perform_setup_phase_rwd(int iv) -{ - - /* Switch on carrier and let the tag charge for 1ms */ - AT91C_BASE_PIOA->PIO_SODR = GPIO_SSC_DOUT; - SpinDelay(1); +// Setup pm3 as a Legic Reader +static uint32_t setup_phase_reader(uint8_t iv) { + + // Switch on carrier and let the tag charge for 1ms + HIGH(GPIO_SSC_DOUT); + WaitUS(1000); + + ResetTicks(); + + // no keystream yet + legic_prng_init(0); + + // send IV handshake + frame_sendAsReader(iv, 7); - legic_prng_init(0); /* no keystream yet */ - frame_send_rwd(iv, 7); + // Now both tag and reader has same IV. Prng can start. legic_prng_init(iv); - frame_clean(¤t_frame); - frame_receive_rwd(¤t_frame, 6, 1); - legic_prng_forward(1); /* we wait anyways */ - while(timer->TC_CV < 387) ; /* ~ 258us */ - frame_send_rwd(0x19, 6); + frame_receiveAsReader(¤t_frame, 6); + // 292us (438t) - fixed delay before sending ack. + // minus log and stuff 100tick? + WaitTicks(338); + legic_prng_forward(3); + + // Send obsfuscated acknowledgment frame. + // 0x19 = 0x18 MIM22, 0x01 LSB READCMD + // 0x39 = 0x38 MIM256, MIM1024 0x01 LSB READCMD + switch ( current_frame.data ) { + case 0x0D: frame_sendAsReader(0x19, 6); break; + case 0x1D: + case 0x3D: frame_sendAsReader(0x39, 6); break; + default: break; + } + + legic_prng_forward(2); return current_frame.data; } static void LegicCommonInit(void) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); /* Bitbang the transmitter */ - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; + LOW(GPIO_SSC_DOUT); AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; - setup_timer(); + // reserve a cardmem, meaning we can use the tracelog function in bigbuff easier. + cardmem = BigBuf_malloc(LEGIC_CARD_MEMSIZE); + memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE); + clear_trace(); + set_tracing(TRUE); crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); + + StartTicks(); } -/* Switch off carrier, make sure tag is reset */ -static void switch_off_tag_rwd(void) -{ - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; - SpinDelay(10); +// Switch off carrier, make sure tag is reset +static void switch_off_tag_rwd(void) { + LOW(GPIO_SSC_DOUT); + WaitUS(20); WDT_HIT(); } -/* calculate crc for a legic command */ -static int LegicCRC(int byte_index, int value, int cmd_sz) { - crc_clear(&legic_crc); - crc_update(&legic_crc, 1, 1); /* CMD_READ */ - crc_update(&legic_crc, byte_index, cmd_sz-1); - crc_update(&legic_crc, value, 8); + +// calculate crc4 for a legic READ command +static uint32_t legic4Crc(uint8_t cmd, uint16_t byte_index, uint8_t value, uint8_t cmd_sz) { + crc_clear(&legic_crc); + uint32_t temp = (value << cmd_sz) | (byte_index << 1) | cmd; + crc_update(&legic_crc, temp, cmd_sz + 8 ); return crc_finish(&legic_crc); } -int legic_read_byte(int byte_index, int cmd_sz) { - int byte; - - legic_prng_forward(4); /* we wait anyways */ - while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */ +int legic_read_byte( uint16_t index, uint8_t cmd_sz) { - frame_send_rwd(1 | (byte_index << 1), cmd_sz); - frame_clean(¤t_frame); + uint8_t byte, crc, calcCrc = 0; + uint32_t cmd = (index << 1) | LEGIC_READ; - frame_receive_rwd(¤t_frame, 12, 1); + //WaitTicks(366); + WaitTicks(330); + //WaitTicks(50); + + frame_sendAsReader(cmd, cmd_sz); + frame_receiveAsReader(¤t_frame, 12); - byte = current_frame.data & 0xff; + // CRC check. + byte = BYTEx(current_frame.data, 0); + crc = BYTEx(current_frame.data, 1); + calcCrc = legic4Crc(LEGIC_READ, index, byte, cmd_sz); - if( LegicCRC(byte_index, byte, cmd_sz) != (current_frame.data >> 8) ) { - Dbprintf("!!! crc mismatch: expected %x but got %x !!!", - LegicCRC(byte_index, current_frame.data & 0xff, cmd_sz), - current_frame.data >> 8); + if( calcCrc != crc ) { + Dbprintf("!!! crc mismatch: expected %x but got %x !!!", calcCrc, crc); return -1; } + legic_prng_forward(4); return byte; } -/* legic_write_byte() is not included, however it's trivial to implement - * and here are some hints on what remains to be done: - * - * * assemble a write_cmd_frame with crc and send it - * * wait until the tag sends back an ACK ('1' bit unencrypted) - * * forward the prng based on the timing +/* + * - assemble a write_cmd_frame with crc and send it + * - wait until the tag sends back an ACK ('1' bit unencrypted) + * - forward the prng based on the timing */ //int legic_write_byte(int byte, int addr, int addr_sz, int PrngCorrection) { -int legic_write_byte(int byte, int addr, int addr_sz) { - //do not write UID, CRC - if(addr <= 0x04) { - return 0; - } - //== send write command ============================== +int legic_write_byte(uint8_t byte, uint16_t addr, uint8_t addr_sz) { + + //do not write UID, CRC at offset 0-4. + if (addr <= 4) return 0; + + // crc crc_clear(&legic_crc); crc_update(&legic_crc, 0, 1); /* CMD_WRITE */ crc_update(&legic_crc, addr, addr_sz); crc_update(&legic_crc, byte, 8); - uint32_t crc = crc_finish(&legic_crc); + + uint32_t crc2 = legic4Crc(LEGIC_WRITE, addr, byte, addr_sz+1); + if ( crc != crc2 ) + Dbprintf("crc is missmatch"); + + // send write command uint32_t cmd = ((crc <<(addr_sz+1+8)) //CRC |(byte <<(addr_sz+1)) //Data |(addr <<1) //Address - |(0x00 <<0)); //CMD = W + | LEGIC_WRITE); //CMD = Write + uint32_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd - legic_prng_forward(4); /* we wait anyways */ - while(timer->TC_CV < 387) ; /* ~ 258us */ - frame_send_rwd(cmd, cmd_sz); - + legic_prng_forward(2); /* we wait anyways */ + + WaitUS(TAG_FRAME_WAIT); + + frame_sendAsReader(cmd, cmd_sz); + + // wllm-rbnt doesnt have these AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; - //== wait for ack ==================================== - int t, old_level=0, edges=0; - int next_bit_at =0; - while(timer->TC_CV < 387) ; /* ~ 258us */ - for(t=0; t<80; t++) { + // wait for ack + int t, old_level = 0, edges = 0; + int next_bit_at = 0; + + WaitUS(TAG_FRAME_WAIT); + + for( t = 0; t < 80; ++t) { edges = 0; - next_bit_at += TAG_TIME_BIT; + next_bit_at += TAG_BIT_PERIOD; while(timer->TC_CV < next_bit_at) { int level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); - if(level != old_level) { + if(level != old_level) edges++; - } + old_level = level; } if(edges > 20 && edges < 60) { /* expected are 42 edges */ int t = timer->TC_CV; - int c = t/TAG_TIME_BIT; - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ - legic_prng_forward(c-1); + int c = t / TAG_BIT_PERIOD; + + ResetTimer(timer); + legic_prng_forward(c); return 0; } } - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ + + ResetTimer(timer); return -1; } -int LegicRfReader(int offset, int bytes) { +int LegicRfReader(uint16_t offset, uint16_t len, uint8_t iv) { - // ice_legic_setup(); - // ice_legic_select_card(); - // return 0; - - int byte_index=0, cmd_sz=0, card_sz=0; + len &= 0x3FF; + uint16_t i = 0; + uint8_t isOK = 1; + legic_card_select_t card; + LegicCommonInit(); - - uint8_t *BigBuf = BigBuf_get_addr(); - memset(BigBuf, 0, 1024); - - DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV); - switch_off_tag_rwd(); //we lose to mutch time with dprintf - switch(tag_type) { - case 0x0d: - DbpString("MIM22 card found, reading card ..."); - cmd_sz = 6; - card_sz = 22; - break; - case 0x1d: - DbpString("MIM256 card found, reading card ..."); - cmd_sz = 9; - card_sz = 256; - break; - case 0x3d: - DbpString("MIM1024 card found, reading card ..."); - cmd_sz = 11; - card_sz = 1024; - break; - default: - Dbprintf("Unknown card format: %x",tag_type); - return -1; + + if ( legic_select_card_iv(&card, iv) ) { + isOK = 0; + goto OUT; } - if(bytes == -1) - bytes = card_sz; - if(bytes+offset >= card_sz) - bytes = card_sz-offset; + switch_off_tag_rwd(); - perform_setup_phase_rwd(SESSION_IV); + if (len + offset >= card.cardsize) + len = card.cardsize - offset; + setup_phase_reader(iv); + LED_B_ON(); - while(byte_index < bytes) { - int r = legic_read_byte(byte_index+offset, cmd_sz); - if(r == -1 ||BUTTON_PRESS()) { - DbpString("operation aborted"); - switch_off_tag_rwd(); - LED_B_OFF(); - LED_C_OFF(); - return -1; + while (i < len) { + int r = legic_read_byte(offset + i, card.cmdsize); + + if (r == -1 || BUTTON_PRESS()) { + if ( MF_DBGLEVEL >= 2) DbpString("operation aborted"); + isOK = 0; + goto OUT; } - BigBuf[byte_index] = r; + cardmem[i++] = r; WDT_HIT(); - byte_index++; - if (byte_index & 0x10) LED_C_ON(); else LED_C_OFF(); } - LED_B_OFF(); - LED_C_OFF(); + +OUT: + WDT_HIT(); switch_off_tag_rwd(); - Dbprintf("Card read, use 'hf legic decode' or"); - Dbprintf("'data hexsamples %d' to view results", (bytes+7) & ~7); + LEDsoff(); + cmd_send(CMD_ACK,isOK,len,0,cardmem,len); return 0; } -/*int _LegicRfWriter(int bytes, int offset, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) { +/*int _LegicRfWriter(int offset, int bytes, int addr_sz, uint8_t *BigBuf, int RoundBruteforceValue) { int byte_index=0; LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); + setup_phase_reader(iv); //legic_prng_forward(2); while(byte_index < bytes) { int r; @@ -533,198 +575,249 @@ int LegicRfReader(int offset, int bytes) { return 0; }*/ -void LegicRfWriter(int bytes, int offset) { - int byte_index=0, addr_sz=0; - uint8_t *BigBuf = BigBuf_get_addr(); +void LegicRfWriter(uint16_t offset, uint16_t bytes, uint8_t iv) { + int byte_index = 0; + uint8_t isOK = 1; + legic_card_select_t card; + LegicCommonInit(); - DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV); + if ( legic_select_card_iv(&card, iv) ) { + isOK = 0; + goto OUT; + } + switch_off_tag_rwd(); - switch(tag_type) { + + switch(card.tagtype) { case 0x0d: if(offset+bytes > 22) { - Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset+bytes); + Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset + bytes); return; } - addr_sz = 5; - Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes); break; case 0x1d: if(offset+bytes > 0x100) { - Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset+bytes); + Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset + bytes); return; } - addr_sz = 8; - Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset+bytes); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing 0x%02.2x - 0x%02.2x ...", offset, offset + bytes); break; case 0x3d: if(offset+bytes > 0x400) { - Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset+bytes); + Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset + bytes); return; } - addr_sz = 10; - Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset+bytes); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing 0x%03.3x - 0x%03.3x ...", offset, offset + bytes); break; default: - Dbprintf("No or unknown card found, aborting"); return; } -#if 1 LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); - + setup_phase_reader(iv); + int r = 0; while(byte_index < bytes) { - int r; //check if the DCF should be changed if ( ((byte_index+offset) == 0x05) && (bytes >= 0x02) ) { //write DCF in reverse order (addr 0x06 before 0x05) - r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz); + r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize); - // write second byte on success... + // write second byte on success if(r == 0) { byte_index++; - r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz); + r = legic_write_byte(cardmem[(0x06-byte_index)], (0x06-byte_index), card.addrsize); } } else { - r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz); + r = legic_write_byte(cardmem[byte_index+offset], byte_index+offset, card.addrsize); } - if((r != 0) || BUTTON_PRESS()) { + + if ((r != 0) || BUTTON_PRESS()) { Dbprintf("operation aborted @ 0x%03.3x", byte_index); - switch_off_tag_rwd(); - LED_B_OFF(); - LED_C_OFF(); - return; + isOK = 0; + goto OUT; } WDT_HIT(); byte_index++; - if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF(); - } - LED_B_OFF(); - LED_C_OFF(); - DbpString("write successful"); -#else - for(byte_index = -2; byte_index < 200; byte_index++) - { - Dbprintf("+ Try RndValue %d...", byte_index); - if(_LegicRfWriter(bytes, offset, addr_sz, BigBuf, byte_index) == 0) - break; } -#endif +OUT: + cmd_send(CMD_ACK, isOK, 0,0,0,0); + switch_off_tag_rwd(); + LEDsoff(); } -void LegicRfRawWriter(int offset, int byte) { - int byte_index=0, addr_sz=0; +void LegicRfRawWriter(int address, int byte, uint8_t iv) { + + int byte_index = 0, addr_sz = 0; LegicCommonInit(); - DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV); + if ( MF_DBGLEVEL >= 2) DbpString("setting up legic card"); + + uint32_t tag_type = setup_phase_reader(iv); + switch_off_tag_rwd(); + switch(tag_type) { case 0x0d: - if(offset > 22) { - Dbprintf("Error: can not write to 0x%03.3x on MIM22", offset); + if(address > 22) { + Dbprintf("Error: can not write to 0x%03.3x on MIM22", address); return; } addr_sz = 5; - Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte); break; case 0x1d: - if(offset > 0x100) { - Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset); + if(address > 0x100) { + Dbprintf("Error: can not write to 0x%03.3x on MIM256", address); return; } addr_sz = 8; - Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", address, byte); break; case 0x3d: - if(offset > 0x400) { - Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset); + if(address > 0x400) { + Dbprintf("Error: can not write to 0x%03.3x on MIM1024", address); return; } addr_sz = 10; - Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", offset, byte); + if ( MF_DBGLEVEL >= 2) Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", address, byte); break; default: Dbprintf("No or unknown card found, aborting"); return; } - Dbprintf("integer value: %d offset: %d addr_sz: %d", byte, offset, addr_sz); + + Dbprintf("integer value: %d address: %d addr_sz: %d", byte, address, addr_sz); LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); - //legic_prng_forward(2); - - int r = legic_write_byte(byte, offset, addr_sz); + + setup_phase_reader(iv); + + int r = legic_write_byte(byte, address, addr_sz); if((r != 0) || BUTTON_PRESS()) { Dbprintf("operation aborted @ 0x%03.3x (%1d)", byte_index, r); switch_off_tag_rwd(); - LED_B_OFF(); - LED_C_OFF(); + LEDsoff(); return; - - WDT_HIT(); - byte_index++; - if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF(); } - LED_B_OFF(); - LED_C_OFF(); - DbpString("write successful"); + + LEDsoff(); + if ( MF_DBGLEVEL >= 1) DbpString("write successful"); +} + +int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){ + + if ( p_card == NULL ) return 1; + + p_card->tagtype = setup_phase_reader(iv); + + switch(p_card->tagtype) { + case 0x0d: + p_card->cmdsize = 6; + p_card->addrsize = 5; + p_card->cardsize = 22; + break; + case 0x1d: + p_card->cmdsize = 9; + p_card->addrsize = 8; + p_card->cardsize = 256; + break; + case 0x3d: + p_card->cmdsize = 11; + p_card->addrsize = 10; + p_card->cardsize = 1024; + break; + default: + p_card->cmdsize = 0; + p_card->addrsize = 0; + p_card->cardsize = 0; + return 2; + } + return 0; +} +int legic_select_card(legic_card_select_t *p_card){ + return legic_select_card_iv(p_card, 0x01); } -int timestamp; +void LegicRfInfo(void){ + + uint8_t buf[sizeof(legic_card_select_t)] = {0x00}; + legic_card_select_t *card = (legic_card_select_t*) buf; + + LegicCommonInit(); + + if ( legic_select_card(card) ) { + cmd_send(CMD_ACK,0,0,0,0,0); + goto OUT; + } + + // read UID bytes + for ( uint8_t i = 0; i < sizeof(card->uid); ++i) { + int r = legic_read_byte(i, card->cmdsize); + if ( r == -1 ) { + cmd_send(CMD_ACK,0,0,0,0,0); + goto OUT; + } + card->uid[i] = r & 0xFF; + } + + cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t)); + +OUT: + switch_off_tag_rwd(); + LEDsoff(); +} -/* Handle (whether to respond) a frame in tag mode */ +/* Handle (whether to respond) a frame in tag mode + * Only called when simulating a tag. + */ static void frame_handle_tag(struct legic_frame const * const f) { uint8_t *BigBuf = BigBuf_get_addr(); /* First Part of Handshake (IV) */ if(f->bits == 7) { - if(f->data == SESSION_IV) { + LED_C_ON(); - prng_timer->TC_CCR = AT91C_TC_SWTRG; + + // Reset prng timer + ResetTimer(prng_timer); + legic_prng_init(f->data); - frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1b */ + frame_send_tag(0x3d, 6, 1); /* 0x3d^0x26 = 0x1B */ legic_state = STATE_IV; legic_read_count = 0; legic_prng_bc = 0; legic_prng_iv = f->data; - /* TIMEOUT */ - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1); - while(timer->TC_CV < 280); - return; - } else if((prng_timer->TC_CV % 50) > 40) { - legic_prng_init(f->data); - frame_send_tag(0x3d, 6, 1); - SpinDelay(20); + + ResetTimer(timer); + WaitUS(280); return; - } } /* 0x19==??? */ if(legic_state == STATE_IV) { - if((f->bits == 6) && (f->data == (0x19 ^ get_key_stream(1, 6)))) { + int local_key = get_key_stream(3, 6); + int xored = 0x39 ^ local_key; + if((f->bits == 6) && (f->data == xored)) { legic_state = STATE_CON; - /* TIMEOUT */ - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1); - while(timer->TC_CV < 200); + ResetTimer(timer); + WaitUS(200); return; - } else { + + } else { legic_state = STATE_DISCON; LED_C_OFF(); - Dbprintf("0x19 - Frame: %03.3x", f->data); + Dbprintf("iv: %02x frame: %02x key: %02x xored: %02x", legic_prng_iv, f->data, local_key, xored); return; } } @@ -732,10 +825,10 @@ static void frame_handle_tag(struct legic_frame const * const f) /* Read */ if(f->bits == 11) { if(legic_state == STATE_CON) { - int key = get_key_stream(-1, 11); //legic_phase_drift, 11); + int key = get_key_stream(2, 11); //legic_phase_drift, 11); int addr = f->data ^ key; addr = addr >> 1; int data = BigBuf[addr]; - int hash = LegicCRC(addr, data, 11) << 8; + int hash = legic4Crc(LEGIC_READ, addr, data, 11) << 8; BigBuf[OFFSET_LOG+legic_read_count] = (uint8_t)addr; legic_read_count++; @@ -744,11 +837,9 @@ static void frame_handle_tag(struct legic_frame const * const f) frame_send_tag(hash | data, 12, 1); - /* SHORT TIMEOUT */ - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1); - legic_prng_forward(legic_frame_drift); - while(timer->TC_CV < 180); + ResetTimer(timer); + legic_prng_forward(2); + WaitUS(180); return; } } @@ -797,21 +888,25 @@ static void frame_handle_tag(struct legic_frame const * const f) /* Read bit by bit untill full frame is received * Call to process frame end answer */ -static void emit(int bit) -{ - if(bit == -1) { - if(current_frame.bits <= 4) { - frame_clean(¤t_frame); - } else { - frame_handle_tag(¤t_frame); - frame_clean(¤t_frame); - } - WDT_HIT(); - } else if(bit == 0) { - frame_append_bit(¤t_frame, 0); - } else if(bit == 1) { - frame_append_bit(¤t_frame, 1); - } +static void emit(int bit) { + + switch (bit) { + case 1: + frame_append_bit(¤t_frame, 1); + break; + case 0: + frame_append_bit(¤t_frame, 0); + break; + default: + if(current_frame.bits <= 4) { + frame_clean(¤t_frame); + } else { + frame_handle_tag(¤t_frame); + frame_clean(¤t_frame); + } + WDT_HIT(); + break; + } } void LegicRfSimulate(int phase, int frame, int reqresp) @@ -827,87 +922,73 @@ void LegicRfSimulate(int phase, int frame, int reqresp) * seems to be 300us-ish. */ - if(phase < 0) { - int i; - for(i=0; i<=reqresp; i++) { - legic_prng_init(SESSION_IV); - Dbprintf("i=%u, key 0x%3.3x", i, get_key_stream(i, frame)); - } - return; - } + legic_phase_drift = phase; + legic_frame_drift = frame; + legic_reqresp_drift = reqresp; + + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaSetupSsc(); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K); + + /* Bitbang the receiver */ + AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; - legic_phase_drift = phase; - legic_frame_drift = frame; - legic_reqresp_drift = reqresp; + //setup_timer(); + crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); - FpgaDownloadAndGo(FPGA_BITSTREAM_HF); - SetAdcMuxFor(GPIO_MUXSEL_HIPKD); - FpgaSetupSsc(); - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K); - - /* Bitbang the receiver */ - AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; - AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; - - setup_timer(); - crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); + int old_level = 0; + int active = 0; + legic_state = STATE_DISCON; + + LED_B_ON(); + DbpString("Starting Legic emulator, press button to end"); - int old_level = 0; - int active = 0; - legic_state = STATE_DISCON; - - LED_B_ON(); - DbpString("Starting Legic emulator, press button to end"); - while(!BUTTON_PRESS() && !usb_poll_validate_length()) { - int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); - int time = timer->TC_CV; - - if(level != old_level) { - if(level == 1) { - timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; - if(FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) { - /* 1 bit */ - emit(1); - active = 1; - LED_A_ON(); - } else if(FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) { - /* 0 bit */ - emit(0); - active = 1; - LED_A_ON(); - } else if(active) { - /* invalid */ - emit(-1); - active = 0; - LED_A_OFF(); - } - } - } + while(!BUTTON_PRESS() && !usb_poll_validate_length()) { + int level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); + int time = timer->TC_CV; - if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) { - /* Frame end */ - emit(-1); - active = 0; - LED_A_OFF(); - } - - if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) { - timer->TC_CCR = AT91C_TC_CLKDIS; - } - - old_level = level; - WDT_HIT(); - } - DbpString("Stopped"); - LED_B_OFF(); - LED_A_OFF(); - LED_C_OFF(); -} + if(level != old_level) { + if(level == 1) { + timer->TC_CCR = AT91C_TC_CLKEN | AT91C_TC_SWTRG; + + if (FUZZ_EQUAL(time, RWD_TIME_1, RWD_TIME_FUZZ)) { + /* 1 bit */ + emit(1); + active = 1; + LED_A_ON(); + } else if (FUZZ_EQUAL(time, RWD_TIME_0, RWD_TIME_FUZZ)) { + /* 0 bit */ + emit(0); + active = 1; + LED_A_ON(); + } else if (active) { + /* invalid */ + emit(-1); + active = 0; + LED_A_OFF(); + } + } + } + /* Frame end */ + if(time >= (RWD_TIME_1+RWD_TIME_FUZZ) && active) { + emit(-1); + active = 0; + LED_A_OFF(); + } -//----------------------------------------------------------------------------- -//----------------------------------------------------------------------------- + if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) { + timer->TC_CCR = AT91C_TC_CLKDIS; + } + old_level = level; + WDT_HIT(); + } + if ( MF_DBGLEVEL >= 1) DbpString("Stopped"); + LEDsoff(); +} //----------------------------------------------------------------------------- // Code up a string of octets at layer 2 (including CRC, we don't generate @@ -1000,6 +1081,7 @@ void LegicRfSimulate(int phase, int frame, int reqresp) // The software UART that receives commands from the reader, and its state // variables. //----------------------------------------------------------------------------- +/* static struct { enum { STATE_UNSYNCD, @@ -1014,7 +1096,7 @@ static struct { int posCnt; uint8_t *output; } Uart; - +*/ /* Receive & handle a bit coming from the reader. * * This function is called 4 times per bit (every 2 subcarrier cycles). @@ -1139,20 +1221,18 @@ static struct { // return FALSE; // } +/* - -static void UartReset() -{ - Uart.byteCntMax = MAX_FRAME_SIZE; +static void UartReset() { + Uart.byteCntMax = 3; Uart.state = STATE_UNSYNCD; Uart.byteCnt = 0; Uart.bitCnt = 0; Uart.posCnt = 0; - memset(Uart.output, 0x00, MAX_FRAME_SIZE); + memset(Uart.output, 0x00, 3); } - -// static void UartInit(uint8_t *data) -// { +*/ +// static void UartInit(uint8_t *data) { // Uart.output = data; // UartReset(); // } @@ -1163,7 +1243,7 @@ static void UartReset() // tag's response, which we leave in the buffer to be demodulated on the // PC side. //============================================================================= - +/* static struct { enum { DEMOD_UNSYNCD, @@ -1182,7 +1262,7 @@ static struct { int sumI; int sumQ; } Demod; - +*/ /* * Handles reception of a bit from the tag * @@ -1197,32 +1277,8 @@ static struct { * false if we are still waiting for some more * */ - - #ifndef SUBCARRIER_DETECT_THRESHOLD - # define SUBCARRIER_DETECT_THRESHOLD 8 - #endif - // Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq))) -#ifndef CHECK_FOR_SUBCARRIER -# define CHECK_FOR_SUBCARRIER() { v = MAX(ai, aq) + MIN(halfci, halfcq); } -#endif - -// The soft decision on the bit uses an estimate of just the -// quadrant of the reference angle, not the exact angle. -// Subcarrier amplitude v = sqrt(ci^2 + cq^2), approximated here by max(abs(ci),abs(cq)) + 1/2*min(abs(ci),abs(cq))) -#define MAKE_SOFT_DECISION() { \ - if(Demod.sumI > 0) \ - v = ci; \ - else \ - v = -ci; \ - \ - if(Demod.sumQ > 0) \ - v += cq; \ - else \ - v -= cq; \ - \ - } - +/* static RAMFUNC int HandleLegicSamplesDemod(int ci, int cq) { int v = 0; @@ -1377,7 +1433,8 @@ static RAMFUNC int HandleLegicSamplesDemod(int ci, int cq) } return FALSE; } - +*/ +/* // Clear out the state of the "UART" that receives from the tag. static void DemodReset() { Demod.len = 0; @@ -1388,20 +1445,24 @@ static void DemodReset() { Demod.bitCount = 0; Demod.thisBit = 0; Demod.shiftReg = 0; - memset(Demod.output, 0x00, MAX_FRAME_SIZE); + memset(Demod.output, 0x00, 3); } static void DemodInit(uint8_t *data) { Demod.output = data; DemodReset(); } +*/ /* * Demodulate the samples we received from the tag, also log to tracebuffer * quiet: set to 'TRUE' to disable debug output */ + + /* #define LEGIC_DMA_BUFFER_SIZE 256 -static void GetSamplesForLegicDemod(int n, bool quiet) + + static void GetSamplesForLegicDemod(int n, bool quiet) { int max = 0; bool gotFrame = FALSE; @@ -1476,9 +1537,13 @@ static void GetSamplesForLegicDemod(int n, bool quiet) LogTrace(Demod.output, Demod.len, 0, 0, parity, FALSE); } } + +*/ + //----------------------------------------------------------------------------- // Transmit the command (to the tag) that was placed in ToSend[]. //----------------------------------------------------------------------------- +/* static void TransmitForLegic(void) { int c; @@ -1525,13 +1590,14 @@ static void TransmitForLegic(void) } LED_B_OFF(); } - +*/ //----------------------------------------------------------------------------- // Code a layer 2 command (string of octets, including CRC) into ToSend[], // so that it is ready to transmit to the tag using TransmitForLegic(). //----------------------------------------------------------------------------- -static void CodeLegicBitsAsReader(const uint8_t *cmd, int bits) +/* +static void CodeLegicBitsAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits) { int i, j; uint8_t b; @@ -1539,17 +1605,17 @@ static void CodeLegicBitsAsReader(const uint8_t *cmd, int bits) ToSendReset(); // Send SOF - for(i = 0; i < 7; i++) { + for(i = 0; i < 7; i++) ToSendStuffBit(1); - } - for(i = 0; i < bits; i++) { + + for(i = 0; i < cmdlen; i++) { // Start bit ToSendStuffBit(0); // Data bits b = cmd[i]; - for(j = 0; j < 8; j++) { + for(j = 0; j < bits; j++) { if(b & 1) { ToSendStuffBit(1); } else { @@ -1562,73 +1628,24 @@ static void CodeLegicBitsAsReader(const uint8_t *cmd, int bits) // Convert from last character reference to length ++ToSendMax; } - +*/ /** Convenience function to encode, transmit and trace Legic comms **/ -static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, int bits) +/* + static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits) { - CodeLegicBitsAsReader(cmd, bits); + CodeLegicBitsAsReader(cmd, cmdlen, bits); TransmitForLegic(); if (tracing) { uint8_t parity[1] = {0x00}; - LogTrace(cmd, bits, 0, 0, parity, TRUE); - } -} - -int ice_legic_select_card() -{ - //int cmd_size=0, card_size=0; - uint8_t wakeup[] = { 0x7F}; - uint8_t getid[] = {0x19}; - - legic_prng_init(SESSION_IV); - - // first, wake up the tag, 7bits - CodeAndTransmitLegicAsReader(wakeup, 7); - - GetSamplesForLegicDemod(1000, TRUE); - - // frame_clean(¤t_frame); - //frame_receive_rwd(¤t_frame, 6, 1); - - legic_prng_forward(1); /* we wait anyways */ - - //while(timer->TC_CV < 387) ; /* ~ 258us */ - //frame_send_rwd(0x19, 6); - CodeAndTransmitLegicAsReader(getid, sizeof(getid)); - GetSamplesForLegicDemod(1000, TRUE); - - //if (Demod.len < 14) return 2; - Dbprintf("CARD TYPE: %02x LEN: %d", Demod.output[0], Demod.len); - - switch(Demod.output[0]) { - case 0x1d: - DbpString("MIM 256 card found"); - // cmd_size = 9; - // card_size = 256; - break; - case 0x3d: - DbpString("MIM 1024 card found"); - // cmd_size = 11; - // card_size = 1024; - break; - default: - return -1; + LogTrace(cmd, cmdlen, 0, 0, parity, TRUE); } - - // if(bytes == -1) - // bytes = card_size; - - // if(bytes + offset >= card_size) - // bytes = card_size - offset; - - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - set_tracing(FALSE); - return 1; } +*/ // Set up LEGIC communication +/* void ice_legic_setup() { // standard things. @@ -1648,7 +1665,7 @@ void ice_legic_setup() { // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_TX | FPGA_HF_READER_TX_SHALLOW_MOD); - SpinDelay(200); + SpinDelay(20); // Start the timer //StartCountSspClk(); @@ -1657,4 +1674,5 @@ void ice_legic_setup() { // initalize prng legic_prng_init(0); -} \ No newline at end of file +} +*/ \ No newline at end of file