X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/90858b95ad0ae44ed2fdf2e7525c170135ce00b7..096dee178438c0a722eaf112c8b63ad4eaa9064a:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 88df543f..e53d0205 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -10,10 +10,11 @@ #include "apps.h" #include "util.h" #include "string.h" -#include "usb_cdc.h" // for usb_poll_validate_length #include "lfsampling.h" +#include "usb_cdc.h" // for usb_poll_validate_length +#include "fpgaloader.h" -sample_config config = { 1, 8, 1, 95, 0 } ; +sample_config config = { 1, 8, 1, 95, 0, 0 } ; void printConfig() { @@ -23,6 +24,7 @@ void printConfig() Dbprintf(" [d] decimation: %d ", config.decimation); Dbprintf(" [a] averaging: %d ", config.averaging); Dbprintf(" [t] trigger threshold: %d ", config.trigger_threshold); + Dbprintf(" [s] samples to skip: %d ", config.samples_to_skip); } @@ -33,7 +35,7 @@ void printConfig() * Other functions may read samples and ignore the sampling config, * such as functions to read the UID from a prox tag or similar. * - * Values set to '0' implies no change (except for averaging) + * Values set to '0' implies no change (except for averaging, threshold, samples_to_skip) * @brief setSamplingConfig * @param sc */ @@ -43,6 +45,7 @@ void setSamplingConfig(sample_config *sc) 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; + if(sc->samples_to_skip != -1) config.samples_to_skip = sc->samples_to_skip; config.averaging= sc->averaging; if(config.bits_per_sample > 8) config.bits_per_sample = 8; @@ -100,7 +103,7 @@ void LFSetupFPGAForADC(int divisor, bool lf_field) // Give it a bit of time 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(); + FpgaSetupSsc(FPGA_MAJOR_MODE_LF_ADC); } /** @@ -118,11 +121,11 @@ 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, int cancel_after, int samples_to_skip) { //. uint8_t *dest = BigBuf_get_addr(); - int bufsize = BigBuf_max_traceLen(); + bufsize = (bufsize > 0 && bufsize < BigBuf_max_traceLen()) ? bufsize : BigBuf_max_traceLen(); //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow) @@ -139,8 +142,10 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag uint32_t sample_sum =0 ; uint32_t sample_total_numbers =0 ; uint32_t sample_total_saved =0 ; + uint32_t cancel_counter = 0; + uint32_t samples_skipped = 0; - while(!BUTTON_PRESS()) { + while(!BUTTON_PRESS() && !usb_poll_validate_length() ) { WDT_HIT(); if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { AT91C_BASE_SSC->SSC_THR = 0x43; @@ -150,10 +155,18 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; LED_D_OFF(); // threshold either high or low values 128 = center 0. if trigger = 178 - if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) // + if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) { // + if (cancel_after > 0) { + cancel_counter++; + if (cancel_after == cancel_counter) break; + } continue; - + } trigger_threshold = 0; + if (samples_to_skip > samples_skipped) { + samples_skipped++; + continue; + } sample_total_numbers++; if(averaging) @@ -212,32 +225,41 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag */ uint32_t DoAcquisition_default(int trigger_threshold, bool silent) { - return DoAcquisition(1,8,0,trigger_threshold,silent); + return DoAcquisition(1,8,0,trigger_threshold,silent,0,0,0); } -uint32_t DoAcquisition_config( bool silent) +uint32_t DoAcquisition_config(bool silent, int sample_size) { return DoAcquisition(config.decimation ,config.bits_per_sample ,config.averaging ,config.trigger_threshold - ,silent); + ,silent + ,sample_size + ,0 + ,config.samples_to_skip); +} + +uint32_t DoPartialAcquisition(int trigger_threshold, bool silent, int sample_size, int cancel_after) { + return DoAcquisition(1,8,0,trigger_threshold,silent,sample_size,cancel_after,0); } -uint32_t ReadLF(bool activeField, bool silent) +uint32_t ReadLF(bool activeField, bool silent, int sample_size) { if (!silent) printConfig(); LFSetupFPGAForADC(config.divisor, activeField); // Now call the acquisition routine - return DoAcquisition_config(silent); + return DoAcquisition_config(silent, sample_size); } /** * Initializes the FPGA for reader-mode (field on), and acquires the samples. * @return number of bits sampled **/ -uint32_t SampleLF(bool printCfg) +uint32_t SampleLF(bool printCfg, int sample_size) { - return ReadLF(true, printCfg); + uint32_t ret = ReadLF(true, printCfg, sample_size); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + return ret; } /** * Initializes the FPGA for snoop-mode (field off), and acquires the samples. @@ -246,18 +268,23 @@ uint32_t SampleLF(bool printCfg) uint32_t SnoopLF() { - return ReadLF(false, true); + uint32_t ret = ReadLF(false, true, 0); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + return ret; } /** -* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds -* the data is collected in BigBuf. +* acquisition of Cotag LF signal. Similar to other LF, since the Cotag has such long datarate RF/384 +* and is Manchester?, we directly gather the manchester data into bigbuff **/ -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 +#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(); @@ -265,53 +292,111 @@ void doT55x7Acquisition(size_t sample_size) { if ( bufsize > sample_size ) bufsize = sample_size; + dest[0] = 0; + uint8_t sample = 0, firsthigh = 0, firstlow = 0; uint16_t i = 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 && iSSC_SR & AT91C_SSC_TXRDY) { AT91C_BASE_SSC->SSC_THR = 0x43; LED_D_ON(); } + if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) { - curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; LED_D_OFF(); - - // skip until the first high sample above threshold - if (!startFound && curSample > T55xx_READ_UPPER_THRESHOLD) { - //if (curSample > lastSample) - // lastSample = curSample; - highFound = true; - } else if (!highFound) { - skipCnt++; - continue; + + // find first peak + if ( !firsthigh ) { + if (sample < COTAG_ONE_THRESHOLD) + continue; + firsthigh = 1; } - // skip until the first Low sample below threshold - if (!startFound && curSample < T55xx_READ_LOWER_THRESHOLD) { - //if (curSample > lastSample) - lastSample = curSample; - lowFound = true; - } else if (!lowFound) { - skipCnt++; - continue; + 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() { - // skip until first high samples begin to change - if (startFound || curSample > T55xx_READ_LOWER_THRESHOLD+T55xx_READ_TOL){ - // if just found start - recover last sample - if (!startFound) { - dest[i++] = lastSample; - startFound = true; + 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; + uint16_t noise_counter = 0; + while (!BUTTON_PRESS() && !usb_poll_validate_length() && (sample_counter < bufsize) && (noise_counter < (COTAG_T1<<1)) ) { + 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) { + noise_counter++; + continue; } - // collect samples - dest[i++] = curSample; + noise_counter = 0; + firsthigh = 1; } + + if ( !firstlow ){ + if (sample > COTAG_ZERO_THRESHOLD ) { + noise_counter++; + continue; + } + noise_counter=0; + 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; }