X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/3e50af4ee494c154e1069dbacd22d55624a6a432..a2937cea8db9a2ef51becff18d3b0227b837b576:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 72aabe00..3b076265 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -119,11 +119,11 @@ 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) { //. 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) @@ -140,6 +140,7 @@ 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; while(!BUTTON_PRESS() && !usb_poll_validate_length() ) { WDT_HIT(); @@ -151,9 +152,13 @@ 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; sample_total_numbers++; @@ -213,32 +218,38 @@ 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); } -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); } -uint32_t ReadLF(bool activeField, bool silent) +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); +} + +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) { - uint32_t ret = ReadLF(true, printCfg); + uint32_t ret = ReadLF(true, printCfg, sample_size); FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); return ret; } @@ -249,80 +260,13 @@ uint32_t SampleLF(bool printCfg) uint32_t SnoopLF() { - uint32_t ret = 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. -**/ -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 && 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; - 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; - } - } - } -} - -/** -* acquisition of Cotag LF signal. Similart to other LF, since the Cotag has such long datarate RF/384 +* 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 **/ #define COTAG_T1 384 @@ -391,8 +335,8 @@ uint32_t doCotagAcquisitionManchester() { 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) ) { + 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; @@ -405,14 +349,20 @@ uint32_t doCotagAcquisitionManchester() { // find first peak if ( !firsthigh ) { - if (sample < COTAG_ONE_THRESHOLD) + if (sample < COTAG_ONE_THRESHOLD) { + noise_counter++; continue; + } + noise_counter = 0; firsthigh = 1; } if ( !firstlow ){ - if (sample > COTAG_ZERO_THRESHOLD ) + if (sample > COTAG_ZERO_THRESHOLD ) { + noise_counter++; continue; + } + noise_counter=0; firstlow = 1; }