X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/db8296025f78251ffa2c28d6fe995bbb0a386c77..893d0fcc493c9786b553bf9c2455be8a4926bebe:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 7c541282..5d1f9248 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -10,8 +10,9 @@ #include "apps.h" #include "util.h" #include "string.h" - #include "lfsampling.h" +#include "usb_cdc.h" // for usb_poll_validate_length +//#include "ticks.h" // for StartTicks sample_config config = { 1, 8, 1, 95, 0 } ; @@ -118,13 +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) +uint32_t DoAcquisition(uint8_t decimation, uint32_t bits_per_sample, bool averaging, int trigger_threshold, bool silent, int bufsize) { //. 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); + //memset(dest, 0, bufsize); //creates issues with cmdread (marshmellow) if(bits_per_sample < 1) bits_per_sample = 1; if(bits_per_sample > 8) bits_per_sample = 8; @@ -140,7 +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; @@ -212,32 +213,39 @@ 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); } -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); +} + +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) +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. @@ -246,17 +254,23 @@ 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. Similart 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+40 // 40 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(); @@ -264,42 +278,105 @@ 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; - uint8_t curSample = 0; - uint8_t lastSample = 0; - uint16_t skipCnt = 0; - while(!BUTTON_PRESS() && skipCnt<1000) { + + 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) { - curSample = (uint8_t)AT91C_BASE_SSC->SSC_RHR; + 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; + } - // 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; + ++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; } - // skip until first high samples begin to change - if (startFound || curSample < T55xx_READ_UPPER_THRESHOLD-T55xx_READ_TOL){ - // if just found start - recover last sample - if (!startFound) { - dest[i++] = lastSample; - startFound = true; - } - // collect samples - dest[i++] = curSample; - if (i >= bufsize-1) break; + 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; }