X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/bf2cd6440689563add52ea8d64f736ae6ed6d676..325f26e25dfd0315d080214bdcaf4d3239ff491c:/armsrc/legicrf.c diff --git a/armsrc/legicrf.c b/armsrc/legicrf.c index c732ee14..f58cb442 100644 --- a/armsrc/legicrf.c +++ b/armsrc/legicrf.c @@ -1,5 +1,6 @@ //----------------------------------------------------------------------------- // (c) 2009 Henryk Plötz +// 2016 Iceman // // 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 @@ -7,18 +8,10 @@ //----------------------------------------------------------------------------- // 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 +33,21 @@ 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; @@ -62,146 +55,174 @@ 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 ticks. 1.5ticks = 1us +#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 +#ifndef LINE_IN +# define LINE_IN AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; +#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) { - /* Use int to enlarge timer tc to 32bit */ + int i; + + // 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. /* 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; - /* 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; + + /* TAG_FRAME_WAIT -> shift by 2 */ + legic_prng_forward(3); + response ^= legic_prng_get_bits(bits); + + /* Wait for the frame start */ + WaitTicks( TAG_FRAME_WAIT ); - /* 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) ; + for (; mask < BITMASK(bits); mask <<= 1) { + if (response & mask) + OPEN_COIL + else + SHORT_COIL + WaitTicks(TAG_BIT_PERIOD); } - AT91C_BASE_PIOA->PIO_CODR = GPIO_SSC_DOUT; + SHORT_COIL; } /* 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, 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(data,2), BYTEx(send,0), BYTEx(send,1), BYTEx(send,2)}; + 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 @@ -214,517 +235,472 @@ 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) { - 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 */ + 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); + + // calibrate the prng. legic_prng_forward(2); + data = legic_prng_get_bits(bits); + + //FIXED time between sending frame and now listening frame. 330us + uint32_t starttime = GET_TICKS; + // its about 9+9 ticks delay from end-send to here. + WaitTicks( 477 ); - if(crypt) { - for(i=0; iTC_CV < next_bit_at) ; - - next_bit_at += TAG_TIME_BIT; + next_bit_at = GET_TICKS + TAG_BIT_PERIOD; - 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 5ms + HIGH(GPIO_SSC_DOUT); + WaitUS(5000); + + ResetTicks(); + + legic_prng_init(0); + + // send IV handshake + frame_sendAsReader(iv, 7); - legic_prng_init(0); /* no keystream yet */ - frame_send_rwd(iv, 7); + // tag and reader has same IV. 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) { +void LegicCommonInit(bool clear_mem) { + 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; + SHORT_COIL; AT91C_BASE_PIOA->PIO_OER = GPIO_SSC_DOUT; AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DOUT; + AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; + + // reserve a cardmem, meaning we can use the tracelog function in bigbuff easier. + cardmem = BigBuf_get_EM_addr(); + if ( clear_mem ) + memset(cardmem, 0x00, LEGIC_CARD_MEMSIZE); - setup_timer(); - + 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) { + SHORT_COIL; + 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; +int legic_read_byte( uint16_t index, uint8_t cmd_sz) { - legic_prng_forward(4); /* we wait anyways */ - while(timer->TC_CV < 387) ; /* ~ 258us + 100us*delay */ - - frame_send_rwd(1 | (byte_index << 1), cmd_sz); - frame_clean(¤t_frame); - - frame_receive_rwd(¤t_frame, 12, 1); + uint8_t byte, crc, calcCrc = 0; + uint32_t cmd = (index << 1) | LEGIC_READ; + + // 90ticks = 60us (should be 100us but crc calc takes time.) + //WaitTicks(330); // 330ticks prng(4) - works + WaitTicks(240); // 240ticks prng(3) - works + + 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: %x != %x !!!", calcCrc, crc); return -1; } + legic_prng_forward(3); 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 ============================== - 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 cmd = ((crc <<(addr_sz+1+8)) //CRC - |(byte <<(addr_sz+1)) //Data - |(addr <<1) //Address - |(0x00 <<0)); //CMD = W - 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); +bool legic_write_byte(uint16_t index, uint8_t byte, uint8_t addr_sz) { - AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; - AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; + bool isOK = false; + int8_t i = 40; + uint8_t edges = 0; + uint8_t cmd_sz = addr_sz+1+8+4; //crc+data+cmd; + uint32_t steps = 0, next_bit_at, start, crc, old_level = 0; - //== 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++) { + crc = legic4Crc(LEGIC_WRITE, index, byte, addr_sz+1); + + // send write command + uint32_t cmd = LEGIC_WRITE; + cmd |= index << 1; // index + cmd |= byte << (addr_sz+1); // Data + cmd |= (crc & 0xF ) << (addr_sz+1+8); // CRC + + WaitTicks(240); + + frame_sendAsReader(cmd, cmd_sz); + + LINE_IN; + + start = GET_TICKS; + + // ACK, - one single "1" bit after 3.6ms + // 3.6ms = 3600us * 1.5 = 5400ticks. + WaitTicks(5400); + + next_bit_at = GET_TICKS + TAG_BIT_PERIOD; + + while ( i-- ) { + WDT_HIT(); edges = 0; - next_bit_at += TAG_TIME_BIT; - while(timer->TC_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) { + + volatile uint32_t level = (AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); + + 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); - return 0; + + next_bit_at += TAG_BIT_PERIOD; + + // We expect 42 edges (ONE) + if(edges > 20 ) { + steps = ( (GET_TICKS - start) / TAG_BIT_PERIOD); + legic_prng_forward(steps); + isOK = true; + goto OUT; } } - timer->TC_CCR = AT91C_TC_SWTRG; - while(timer->TC_CV > 1) ; /* Wait till the clock has reset */ - return -1; + +OUT: ; + legic_prng_forward(1); + + uint8_t cmdbytes[] = {1, isOK, BYTEx(steps, 0), BYTEx(steps, 1) }; + LogTrace(cmdbytes, sizeof(cmdbytes), start, GET_TICKS, NULL, FALSE); + return isOK; } -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; + uint16_t i = 0; + uint8_t isOK = 1; + legic_card_select_t card; - int byte_index=0, cmd_sz=0, card_sz=0; - - 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; + LegicCommonInit(TRUE); + + 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; - perform_setup_phase_rwd(SESSION_IV); + if (len + offset > card.cardsize) + len = card.cardsize - offset; 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 byte_index=0; - - LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); - //legic_prng_forward(2); - while(byte_index < bytes) { - int r; - - //check if the DCF should be changed - if ( (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, RoundBruteforceValue); - //legic_prng_forward(1); - if(r == 0) { - byte_index++; - r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz, RoundBruteforceValue); - } - //legic_prng_forward(1); - } - else { - r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz, RoundBruteforceValue); - } - if((r != 0) || BUTTON_PRESS()) { - Dbprintf("operation aborted @ 0x%03.3x", byte_index); - switch_off_tag_rwd(); - LED_B_OFF(); - LED_C_OFF(); - return -1; - } +void LegicRfWriter(uint16_t offset, uint16_t len, uint8_t iv, uint8_t *data) { - WDT_HIT(); - byte_index++; - if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF(); + #define LOWERLIMIT 4 + uint8_t isOK = 1, msg = 0; + legic_card_select_t card; + + // uid NOT is writeable. + if ( offset <= LOWERLIMIT ) { + isOK = 0; + goto OUT; } - LED_B_OFF(); - LED_C_OFF(); - DbpString("write successful"); - return 0; -}*/ + + LegicCommonInit(TRUE); + + if ( legic_select_card_iv(&card, iv) ) { + isOK = 0; + msg = 1; + goto OUT; + } + + if ( len + offset > card.cardsize) + len = card.cardsize - offset; + + LED_B_ON(); + while( len > 0 ) { + --len; + if ( !legic_write_byte( len + offset, data[len], card.addrsize) ) { + Dbprintf("operation failed | %02X | %02X | %02X", len + offset, len, data[len] ); + isOK = 0; + goto OUT; + } + WDT_HIT(); + } +OUT: + cmd_send(CMD_ACK, isOK, msg,0,0,0); + switch_off_tag_rwd(); + LEDsoff(); +} -void LegicRfWriter(int bytes, int offset) { - int byte_index=0, addr_sz=0; - uint8_t *BigBuf = BigBuf_get_addr(); +int legic_select_card_iv(legic_card_select_t *p_card, uint8_t iv){ - LegicCommonInit(); + if ( p_card == NULL ) return 1; - DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(SESSION_IV); - switch_off_tag_rwd(); - switch(tag_type) { + p_card->tagtype = setup_phase_reader(iv); + + switch(p_card->tagtype) { case 0x0d: - if(offset+bytes > 22) { - 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); + p_card->cmdsize = 6; + p_card->addrsize = 5; + p_card->cardsize = 22; break; case 0x1d: - if(offset+bytes > 0x100) { - 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); + p_card->cmdsize = 9; + p_card->addrsize = 8; + p_card->cardsize = 256; break; case 0x3d: - if(offset+bytes > 0x400) { - 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); + p_card->cmdsize = 11; + p_card->addrsize = 10; + p_card->cardsize = 1024; break; - default: - Dbprintf("No or unknown card found, aborting"); - return; + 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); +} -#if 1 - LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); +//----------------------------------------------------------------------------- +// Work with emulator memory +// +// Note: we call FpgaDownloadAndGo(FPGA_BITSTREAM_HF) here although FPGA is not +// involved in dealing with emulator memory. But if it is called later, it might +// destroy the Emulator Memory. +//----------------------------------------------------------------------------- +// arg0 = offset +// arg1 = num of bytes +void LegicEMemSet(uint32_t arg0, uint32_t arg1, uint8_t *data) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + legic_emlset_mem(data, arg0, arg1); +} +// arg0 = offset +// arg1 = num of bytes +void LegicEMemGet(uint32_t arg0, uint32_t arg1) { + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + uint8_t buf[USB_CMD_DATA_SIZE] = {0x00}; + legic_emlget_mem(buf, arg0, arg1); + LED_B_ON(); + cmd_send(CMD_ACK, arg0, arg1, 0, buf, USB_CMD_DATA_SIZE); + LED_B_OFF(); +} +void legic_emlset_mem(uint8_t *data, int offset, int numofbytes) { + cardmem = BigBuf_get_EM_addr(); + memcpy(cardmem + offset, data, numofbytes); +} +void legic_emlget_mem(uint8_t *data, int offset, int numofbytes) { + cardmem = BigBuf_get_EM_addr(); + memcpy(data, cardmem + offset, numofbytes); +} - while(byte_index < bytes) { - int r; +void LegicRfInfo(void){ - //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); + int r; + + uint8_t buf[sizeof(legic_card_select_t)] = {0x00}; + legic_card_select_t *card = (legic_card_select_t*) buf; + + LegicCommonInit(FALSE); - // write second byte on success... - if(r == 0) { - byte_index++; - r = legic_write_byte(BigBuf[(0x06-byte_index)], (0x06-byte_index), addr_sz); - } - } - else { - r = legic_write_byte(BigBuf[byte_index+offset], byte_index+offset, addr_sz); - } - if((r != 0) || BUTTON_PRESS()) { - Dbprintf("operation aborted @ 0x%03.3x", byte_index); - switch_off_tag_rwd(); - LED_B_OFF(); - LED_C_OFF(); - return; - } + if ( legic_select_card(card) ) { + cmd_send(CMD_ACK,0,0,0,0,0); + goto OUT; + } - WDT_HIT(); - byte_index++; - if(byte_index & 0x10) LED_C_ON(); else LED_C_OFF(); + // read UID bytes + for ( uint8_t i = 0; i < sizeof(card->uid); ++i) { + 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; } - 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; + + // MCC byte. + r = legic_read_byte(4, card->cmdsize); + uint32_t calc_mcc = CRC8Legic(card->uid, 4);; + if ( r != calc_mcc) { + cmd_send(CMD_ACK,0,0,0,0,0); + goto OUT; } -#endif + + // OK + cmd_send(CMD_ACK, 1, 0, 0, buf, sizeof(legic_card_select_t)); +OUT: + switch_off_tag_rwd(); + LEDsoff(); } -void LegicRfRawWriter(int offset, int byte) { - int byte_index=0, addr_sz=0; - - LegicCommonInit(); - - DbpString("setting up legic card"); - uint32_t tag_type = perform_setup_phase_rwd(SESSION_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); - return; - } - addr_sz = 5; - Dbprintf("MIM22 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte); - break; - case 0x1d: - if(offset > 0x100) { - Dbprintf("Error: can not write to 0x%03.3x on MIM256", offset); - return; - } - addr_sz = 8; - Dbprintf("MIM256 card found, writing at addr 0x%02.2x - value 0x%02.2x ...", offset, byte); - break; - case 0x3d: - if(offset > 0x400) { - Dbprintf("Error: can not write to 0x%03.3x on MIM1024", offset); - return; - } - addr_sz = 10; - Dbprintf("MIM1024 card found, writing at addr 0x%03.3x - value 0x%03.3x ...", offset, byte); - break; - default: - Dbprintf("No or unknown card found, aborting"); - return; - } - Dbprintf("integer value: %d offset: %d addr_sz: %d", byte, offset, addr_sz); - LED_B_ON(); - perform_setup_phase_rwd(SESSION_IV); - //legic_prng_forward(2); +/* 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) +{ + // log + //uint8_t cmdbytes[] = {bits, BYTEx(data, 0), BYTEx(data, 1)}; + //LogTrace(cmdbytes, sizeof(cmdbytes), starttime, GET_TICKS, NULL, FALSE); + //Dbprintf("ICE: enter frame_handle_tag: %02x ", f->bits); - int r = legic_write_byte(byte, offset, addr_sz); + /* First Part of Handshake (IV) */ + if(f->bits == 7) { + + LED_C_ON(); + + // Reset prng timer + //ResetTimer(prng_timer); + ResetTicks(); + + // IV from reader. + legic_prng_init(f->data); - 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(); + Dbprintf("ICE: IV: %02x ", f->data); + + // We should have three tagtypes with three different answers. + legic_prng_forward(2); + //frame_send_tag(0x3d, 6); /* MIM1024 0x3d^0x26 = 0x1B */ + frame_send_tag(0x1d, 6); // MIM256 + + legic_state = STATE_IV; + legic_read_count = 0; + legic_prng_bc = 0; + legic_prng_iv = f->data; + + //ResetTimer(timer); + //WaitUS(280); + WaitTicks(388); 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"); -} - -int timestamp; - -/* Handle (whether to respond) a frame in tag mode */ -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; - legic_prng_init(f->data); - 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); - return; - } - } /* 0x19==??? */ if(legic_state == STATE_IV) { - if((f->bits == 6) && (f->data == (0x19 ^ get_key_stream(1, 6)))) { + uint32_t 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); + WaitTicks(300); 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; } } @@ -732,86 +708,77 @@ 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 addr = f->data ^ key; addr = addr >> 1; - int data = BigBuf[addr]; - int hash = LegicCRC(addr, data, 11) << 8; - BigBuf[OFFSET_LOG+legic_read_count] = (uint8_t)addr; - legic_read_count++; - - //Dbprintf("Data:%03.3x, key:%03.3x, addr: %03.3x, read_c:%u", f->data, key, addr, read_c); - legic_prng_forward(legic_reqresp_drift); - - 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); + uint32_t key = get_key_stream(2, 11); //legic_phase_drift, 11); + uint16_t addr = f->data ^ key; + addr >>= 1; + uint8_t data = cardmem[addr]; + + uint32_t crc = legic4Crc(LEGIC_READ, addr, data, 11) << 8; + + //legic_read_count++; + //legic_prng_forward(legic_reqresp_drift); + + frame_send_tag(crc | data, 12); + //ResetTimer(timer); + legic_prng_forward(2); + WaitTicks(330); return; } } /* Write */ - if(f->bits == 23) { - int key = get_key_stream(-1, 23); //legic_frame_drift, 23); - int addr = f->data ^ key; addr = addr >> 1; addr = addr & 0x3ff; - int data = f->data ^ key; data = data >> 11; data = data & 0xff; - + if (f->bits == 23 || f->bits == 21 ) { + uint32_t key = get_key_stream(-1, 23); //legic_frame_drift, 23); + uint16_t addr = f->data ^ key; + addr >>= 1; + addr &= 0x3ff; + uint32_t data = f->data ^ key; + data >>= 11; + data &= 0xff; + + cardmem[addr] = data; /* write command */ legic_state = STATE_DISCON; LED_C_OFF(); Dbprintf("write - addr: %x, data: %x", addr, data); + // should send a ACK after 3.6ms return; } if(legic_state != STATE_DISCON) { Dbprintf("Unexpected: sz:%u, Data:%03.3x, State:%u, Count:%u", f->bits, f->data, legic_state, legic_read_count); - int i; Dbprintf("IV: %03.3x", legic_prng_iv); - for(i = 0; iPIO_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"); - 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(); - } - } - } + /* to get the stream of bits from FPGA in sim mode.*/ + FpgaDownloadAndGo(FPGA_BITSTREAM_HF); + // Set up the synchronous serial port + //FpgaSetupSsc(); + // connect Demodulated Signal to ADC: + SetAdcMuxFor(GPIO_MUXSEL_HIPKD); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_212K); + //FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_NO_MODULATION); - 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(); -} + #define LEGIC_DMA_BUFFER 256 + // The DMA buffer, used to stream samples from the FPGA + //uint8_t *dmaBuf = BigBuf_malloc(LEGIC_DMA_BUFFER); + //uint8_t *data = dmaBuf; + // Setup and start DMA. + // if ( !FpgaSetupSscDma((uint8_t*) dmaBuf, LEGIC_DMA_BUFFER) ){ + // if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting"); + // return; + // } + //StartCountSspClk(); + /* Bitbang the receiver */ + AT91C_BASE_PIOA->PIO_ODR = GPIO_SSC_DIN; + AT91C_BASE_PIOA->PIO_PER = GPIO_SSC_DIN; -//----------------------------------------------------------------------------- -//----------------------------------------------------------------------------- + // need a way to determine which tagtype we are simulating + + // hook up emulator memory + cardmem = BigBuf_get_EM_addr(); + + clear_trace(); + set_tracing(TRUE); + + crc_init(&legic_crc, 4, 0x19 >> 1, 0x5, 0); + + StartTicks(); + + LED_B_ON(); + DbpString("Starting Legic emulator, press button to end"); + + /* + * The mode FPGA_HF_SIMULATOR_MODULATE_212K works like this. + * - A 1-bit input to the FPGA becomes 8 pulses on 212kHz (fc/64) (18.88us). + * - A 0-bit input to the FPGA becomes an unmodulated time of 18.88us + * + * In this mode the SOF can be written as 00011101 = 0x1D + * The EOF can be written as 10111000 = 0xb8 + * A logic 1 is 01 + * A logic 0 is 10 + volatile uint8_t b; + uint8_t i = 0; + while( !BUTTON_PRESS() ) { + WDT_HIT(); + + // not sending anything. + if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) { + AT91C_BASE_SSC->SSC_THR = 0x00; + } + + // receive + if ( AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY ) { + b = (uint8_t) AT91C_BASE_SSC->SSC_RHR; + bd[i] = b; + ++i; + // if(OutOfNDecoding(b & 0x0f)) + // *len = Uart.byteCnt; + } + + } + */ + + while(!BUTTON_PRESS() && !usb_poll_validate_length()) { + + level = !!(AT91C_BASE_PIOA->PIO_PDSR & GPIO_SSC_DIN); + + uint32_t time = GET_TICKS; + + if (level != old_level) { + if (level == 1) { + + //Dbprintf("start, %u ", time); + StartTicks(); + // did we get a signal + 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(); + } + + /* + * Disable the counter, Then wait for the clock to acknowledge the + * shutdown in its status register. Reading the SR has the + * side-effect of clearing any pending state in there. + */ + //if(time >= (20*RWD_TIME_1) && (timer->TC_SR & AT91C_TC_CLKSTA)) + if(time >= (20 * RWD_TIME_1) ) + StopTicks(); + + old_level = level; + WDT_HIT(); +} + + WDT_HIT(); + DbpString("LEGIC Prime emulator stopped"); + switch_off_tag_rwd(); + FpgaDisableSscDma(); + LEDsoff(); + cmd_send(CMD_ACK, 1, 0, 0, 0, 0); +} //----------------------------------------------------------------------------- @@ -1000,6 +1025,7 @@ 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 +1040,7 @@ 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 +1165,18 @@ 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 +1187,7 @@ 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 +1206,7 @@ static struct { int sumI; int sumQ; } Demod; - +*/ /* * Handles reception of a bit from the tag * @@ -1197,32 +1221,8 @@ 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 +1377,8 @@ 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 +1389,24 @@ 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 +1481,13 @@ 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; @@ -1525,12 +1534,13 @@ 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, uint8_t cmdlen, int bits) { int i, j; @@ -1562,73 +1572,24 @@ static void CodeLegicBitsAsReader(const uint8_t *cmd, uint8_t cmdlen, 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, uint8_t cmdlen, int bits) +/* + static void CodeAndTransmitLegicAsReader(const uint8_t *cmd, uint8_t cmdlen, int bits) { CodeLegicBitsAsReader(cmd, cmdlen, bits); TransmitForLegic(); if (tracing) { uint8_t parity[1] = {0x00}; - LogTrace(cmd, bits, 0, 0, parity, TRUE); + LogTrace(cmd, cmdlen, 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, sizeof(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), 8); - 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; - } - - // 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 +1609,7 @@ 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 +1618,5 @@ void ice_legic_setup() { // initalize prng legic_prng_init(0); -} \ No newline at end of file +} +*/ \ No newline at end of file