X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/b67f7ec359806293a6da14208bad56b842dedb60..95215e873f969f76a3e028c975342c8d3be48bff:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 7af065ea..3a502eb6 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -12,12 +12,12 @@ #include "string.h" #include "lfsampling.h" -#include "cipherutils.h" + sample_config config = { 1, 8, 1, 95, 0 } ; void printConfig() { - Dbprintf("Sampling config: "); + Dbprintf("LF Sampling config: "); Dbprintf(" [q] divisor: %d ", config.divisor); Dbprintf(" [b] bps: %d ", config.bits_per_sample); Dbprintf(" [d] decimation: %d ", config.decimation); @@ -40,11 +40,11 @@ void printConfig() 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; + 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; + config.averaging = sc->averaging; if(config.bits_per_sample > 8) config.bits_per_sample = 8; if(config.decimation < 1) config.decimation = 1; @@ -55,20 +55,19 @@ sample_config* getSamplingConfig() { return &config; } -/* + typedef struct { 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; @@ -76,7 +75,7 @@ typedef struct { stream->position++; stream->numbits++; } -*/ + /** * Setup the FPGA to listen for samples. This method downloads the FPGA bitstream * if not already loaded, sets divisor and starts up the antenna. @@ -120,14 +119,13 @@ 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) { - //. + //bigbuf, to hold the aquired raw data signal uint8_t *dest = BigBuf_get_addr(); - int bufsize = BigBuf_max_traceLen(); + uint16_t bufsize = BigBuf_max_traceLen(); - memset(dest, 0, bufsize); + BigBuf_Clear_ext(false); if(bits_per_sample < 1) bits_per_sample = 1; if(bits_per_sample > 8) bits_per_sample = 8; @@ -143,7 +141,7 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag uint32_t sample_total_numbers =0 ; uint32_t sample_total_saved =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; @@ -152,7 +150,8 @@ uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averag if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_RXRDY) { sample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; LED_D_OFF(); - if (trigger_threshold > 0 && sample < trigger_threshold) + // threshold either high or low values 128 = center 0. if trigger = 178 + if ((trigger_threshold > 0) && (sample < (trigger_threshold+128)) && (sample > (128-trigger_threshold))) // continue; trigger_threshold = 0; @@ -225,28 +224,94 @@ uint32_t DoAcquisition_config( bool silent) ,silent); } -uint32_t ReadLF(bool activeField) +uint32_t ReadLF(bool activeField, bool silent) { - printConfig(); + if (!silent) printConfig(); LFSetupFPGAForADC(config.divisor, activeField); // Now call the acquisition routine - return DoAcquisition_config(false); + return DoAcquisition_config(silent); } /** * Initializes the FPGA for reader-mode (field on), and acquires the samples. * @return number of bits sampled **/ -uint32_t SampleLF() +uint32_t SampleLF(bool printCfg) { - return ReadLF(true); + return ReadLF(true, printCfg); } /** * Initializes the FPGA for snoop-mode (field off), and acquires the samples. * @return number of bits sampled **/ +uint32_t SnoopLF() { + return ReadLF(false, true); +} -uint32_t SnoopLF() -{ - return ReadLF(false); +/** +* acquisition of T55x7 LF signal. Similart to other LF, but adjusted with @marshmellows thresholds +* the data is collected in BigBuf. +**/ +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; + 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 && (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) { + curSample = (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; + } + // 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; + } + + + // 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; + } + // collect samples + dest[i++] = curSample; + } + } + } } + \ No newline at end of file