X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/6426f6ba86c8a2d3e390fab1ced35223a92d8647..76a608af8e342b50718cfd0e53c0fa932304dbd9:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 8931f41d..fe595bf2 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -6,26 +6,27 @@ // Miscellaneous routines for low frequency sampling. //----------------------------------------------------------------------------- -#include "proxmark3.h" -#include "apps.h" -#include "util.h" -#include "string.h" - #include "lfsampling.h" +/* +Default LF config is set to: + decimation = 1 (we keep 1 out of 1 samples) + bits_per_sample = 8 + averaging = YES + divisor = 95 (125khz) + trigger_threshold = 0 + */ sample_config config = { 1, 8, 1, 95, 0 } ; -void printConfig() -{ +void printConfig() { Dbprintf("LF Sampling config: "); - Dbprintf(" [q] divisor: %d ", config.divisor); + Dbprintf(" [q] divisor: %d (%d KHz)", config.divisor, 12000 / (config.divisor+1)); Dbprintf(" [b] bps: %d ", config.bits_per_sample); Dbprintf(" [d] decimation: %d ", config.decimation); - Dbprintf(" [a] averaging: %d ", config.averaging); + Dbprintf(" [a] averaging: %s ", (config.averaging) ? "Yes" : "No"); Dbprintf(" [t] trigger threshold: %d ", config.trigger_threshold); } - /** * Called from the USB-handler to set the sampling configuration * The sampling config is used for std reading and snooping. @@ -37,38 +38,34 @@ void printConfig() * @brief setSamplingConfig * @param sc */ -void setSamplingConfig(sample_config *sc) -{ +void setSamplingConfig(sample_config *sc) { if(sc->divisor != 0) config.divisor = sc->divisor; - if(sc->bits_per_sample!= 0) config.bits_per_sample= sc->bits_per_sample; - if(sc->decimation!= 0) config.decimation= sc->decimation; - if(sc->trigger_threshold != -1) config.trigger_threshold= sc->trigger_threshold; - - config.averaging= sc->averaging; + if(sc->bits_per_sample != 0) config.bits_per_sample = sc->bits_per_sample; + if(sc->trigger_threshold != -1) config.trigger_threshold = sc->trigger_threshold; + + config.decimation = (sc->decimation != 0) ? sc->decimation : 1; + config.averaging = sc->averaging; if(config.bits_per_sample > 8) config.bits_per_sample = 8; - if(config.decimation < 1) config.decimation = 1; printConfig(); } -sample_config* getSamplingConfig() -{ +sample_config* getSamplingConfig() { return &config; } -typedef struct { +struct BitstreamOut { uint8_t * buffer; uint32_t numbits; uint32_t position; -} BitstreamOut; +}; /** * @brief Pushes bit onto the stream * @param stream * @param bit */ -void pushBit( BitstreamOut* stream, uint8_t bit) -{ +void pushBit( BitstreamOut* stream, uint8_t bit) { int bytepos = stream->position >> 3; // divide by 8 int bitpos = stream->position & 7; *(stream->buffer+bytepos) |= (bit > 0) << (7 - bitpos); @@ -83,8 +80,7 @@ void pushBit( BitstreamOut* stream, uint8_t bit) * 0 or 95 ==> 125 KHz * **/ -void LFSetupFPGAForADC(int divisor, bool lf_field) -{ +void LFSetupFPGAForADC(int divisor, bool lf_field) { FpgaDownloadAndGo(FPGA_BITSTREAM_LF); if ( (divisor == 1) || (divisor < 0) || (divisor > 255) ) FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz @@ -97,13 +93,14 @@ void LFSetupFPGAForADC(int divisor, bool lf_field) // Connect the A/D to the peak-detected low-frequency path. SetAdcMuxFor(GPIO_MUXSEL_LOPKD); - // Give it a bit of time for the resonant antenna to settle. + // 50ms for the resonant antenna to settle. SpinDelay(50); // Now set up the SSC to get the ADC samples that are now streaming at us. FpgaSetupSsc(); + // start a 1.5ticks is 1us + StartTicks(); } - /** * Does the sample acquisition. If threshold is specified, the actual sampling * is not commenced until the threshold has been reached. @@ -119,13 +116,12 @@ void LFSetupFPGAForADC(int divisor, bool lf_field) * @param silent - is true, now outputs are made. If false, dbprints the status * @return the number of bits occupied by the samples. */ -uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold,bool silent) -{ +uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize) { //bigbuf, to hold the aquired raw data signal uint8_t *dest = BigBuf_get_addr(); - uint16_t bufsize = BigBuf_max_traceLen(); + bufsize = (bufsize > 0 && bufsize < BigBuf_max_traceLen()) ? bufsize : BigBuf_max_traceLen(); - BigBuf_Clear_ext(false); + //BigBuf_Clear_ext(false); //creates issues with cmdread (marshmellow) if(bits_per_sample < 1) bits_per_sample = 1; if(bits_per_sample > 8) bits_per_sample = 8; @@ -211,24 +207,26 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag * @param silent * @return number of bits sampled */ -uint32_t DoAcquisition_default(int trigger_threshold, bool silent) -{ - return DoAcquisition(1,8,0,trigger_threshold,silent); +uint32_t DoAcquisition_default(int trigger_threshold, bool silent) { + return DoAcquisition(1, 8, 0,trigger_threshold, silent, 0); } -uint32_t DoAcquisition_config( bool silent) -{ +uint32_t DoAcquisition_config( bool silent) { return DoAcquisition(config.decimation ,config.bits_per_sample ,config.averaging ,config.trigger_threshold - ,silent); + ,silent + ,0); +} + +uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size) { + return DoAcquisition(1, 8, 0, trigger_threshold, silent, sample_size); } -uint32_t ReadLF(bool activeField, bool silent) -{ - if (!silent) printConfig(); +uint32_t ReadLF(bool activeField, bool silent) { + if (!silent) + printConfig(); LFSetupFPGAForADC(config.divisor, activeField); - // Now call the acquisition routine return DoAcquisition_config(silent); } @@ -236,16 +234,21 @@ uint32_t ReadLF(bool activeField, bool silent) * Initializes the FPGA for reader-mode (field on), and acquires the samples. * @return number of bits sampled **/ -uint32_t SampleLF(bool printCfg) -{ - return ReadLF(true, printCfg); +uint32_t SampleLF(bool printCfg) { + BigBuf_Clear_ext(false); + uint32_t ret = ReadLF(true, printCfg); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + return ret; } /** * Initializes the FPGA for snoop-mode (field off), and acquires the samples. * @return number of bits sampled **/ uint32_t SnoopLF() { - return ReadLF(false, true); + BigBuf_Clear_ext(false); + uint32_t ret = ReadLF(false, true); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + return ret; } /** @@ -257,24 +260,23 @@ void doT55x7Acquisition(size_t sample_size) { #define T55xx_READ_UPPER_THRESHOLD 128+60 // 60 grph #define T55xx_READ_LOWER_THRESHOLD 128-60 // -60 grph #define T55xx_READ_TOL 5 - + uint8_t *dest = BigBuf_get_addr(); uint16_t bufsize = BigBuf_max_traceLen(); if ( bufsize > sample_size ) bufsize = sample_size; - uint16_t i = 0; + uint8_t curSample = 0, lastSample = 0; + uint16_t i = 0, skipCnt = 0; bool startFound = false; bool highFound = false; bool lowFound = false; - uint8_t curSample = 0; - uint8_t lastSample = 0; - uint16_t skipCnt = 0; - while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt<1000) { + + while(!BUTTON_PRESS() && !usb_poll_validate_length() && skipCnt < 1000 && (i < bufsize) ) { WDT_HIT(); if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { - AT91C_BASE_SSC->SSC_THR = 0x43; + AT91C_BASE_SSC->SSC_THR = 0x43; //43 LED_D_ON(); } if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) { @@ -290,7 +292,7 @@ void doT55x7Acquisition(size_t sample_size) { skipCnt++; continue; } - // skip until the first Low sample below threshold + // skip until the first low sample below threshold if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) { //if (curSample > lastSample) lastSample = curSample; @@ -300,19 +302,138 @@ void doT55x7Acquisition(size_t sample_size) { continue; } - // skip until first high samples begin to change - if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){ + if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD + T55xx_READ_TOL){ // if just found start - recover last sample if (!startFound) { dest[i++] = lastSample; - startFound = true; + startFound = true; } // collect samples dest[i++] = curSample; - if (i >= bufsize-1) break; } } } } - \ No newline at end of file +/** +* acquisition of Cotag LF signal. Similart to other LF, since the Cotag has such long datarate RF/384 +* and is Manchester?, we directly gather the manchester data into bigbuff +**/ + +#define COTAG_T1 384 +#define COTAG_T2 (COTAG_T1>>1) +#define COTAG_ONE_THRESHOLD 128+30 +#define COTAG_ZERO_THRESHOLD 128-30 +#ifndef COTAG_BITS +#define COTAG_BITS 264 +#endif +void doCotagAcquisition(size_t sample_size) { + + uint8_t *dest = BigBuf_get_addr(); + uint16_t bufsize = BigBuf_max_traceLen(); + + if ( bufsize > sample_size ) + bufsize = sample_size; + + dest[0] = 0; + uint8_t sample = 0, firsthigh = 0, firstlow = 0; + uint16_t i = 0; + + while (!BUTTON_PRESS() && !usb_poll_validate_length() && (i < bufsize) ) { + WDT_HIT(); + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + AT91C_BASE_SSC->SSC_THR = 0x43; + LED_D_ON(); + } + + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) { + sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + LED_D_OFF(); + + // find first peak + if ( !firsthigh ) { + if (sample < COTAG_ONE_THRESHOLD) + continue; + firsthigh = 1; + } + if ( !firstlow ){ + if (sample > COTAG_ZERO_THRESHOLD ) + continue; + firstlow = 1; + } + + ++i; + + if ( sample > COTAG_ONE_THRESHOLD) + dest[i] = 255; + else if ( sample < COTAG_ZERO_THRESHOLD) + dest[i] = 0; + else + dest[i] = dest[i-1]; + } + } +} + +uint32_t doCotagAcquisitionManchester() { + + uint8_t *dest = BigBuf_get_addr(); + uint16_t bufsize = BigBuf_max_traceLen(); + + if ( bufsize > COTAG_BITS ) + bufsize = COTAG_BITS; + + dest[0] = 0; + uint8_t sample = 0, firsthigh = 0, firstlow = 0; + uint16_t sample_counter = 0, period = 0; + uint8_t curr = 0, prev = 0; + + while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) ) { + WDT_HIT(); + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { + AT91C_BASE_SSC->SSC_THR = 0x43; + LED_D_ON(); + } + + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) { + sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + LED_D_OFF(); + + // find first peak + if ( !firsthigh ) { + if (sample < COTAG_ONE_THRESHOLD) + continue; + firsthigh = 1; + } + + if ( !firstlow ){ + if (sample > COTAG_ZERO_THRESHOLD ) + continue; + firstlow = 1; + } + + // set sample 255, 0, or previous + if ( sample > COTAG_ONE_THRESHOLD){ + prev = curr; + curr = 1; + } + else if ( sample < COTAG_ZERO_THRESHOLD) { + prev = curr; + curr = 0; + } + else { + curr = prev; + } + + // full T1 periods, + if ( period > 0 ) { + --period; + continue; + } + + dest[sample_counter] = curr; + ++sample_counter; + period = COTAG_T1; + } + } + return sample_counter; +} \ No newline at end of file