X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/40148ab609cdcf58ae6ef517c319a758006e1c6d..da05bc6eca632aa8ef5251942919ab8650191357:/armsrc/lfsampling.c diff --git a/armsrc/lfsampling.c b/armsrc/lfsampling.c index 7af065ea..3b076265 100644 --- a/armsrc/lfsampling.c +++ b/armsrc/lfsampling.c @@ -10,14 +10,15 @@ #include "apps.h" #include "util.h" #include "string.h" - #include "lfsampling.h" -#include "cipherutils.h" +#include "usb_cdc.h" // for usb_poll_validate_length +//#include "ticks.h" // for StartTicks + 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); @@ -55,20 +56,19 @@ 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 +76,7 @@ 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. @@ -104,7 +104,6 @@ void LFSetupFPGAForADC(int divisor, bool lf_field) FpgaSetupSsc(); } - /** * Does the sample acquisition. If threshold is specified, the actual sampling * is not commenced until the threshold has been reached. @@ -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) +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); + //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; @@ -142,8 +140,9 @@ 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()) { + while(!BUTTON_PRESS() && !usb_poll_validate_length() ) { WDT_HIT(); if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) { AT91C_BASE_SSC->SSC_THR = 0x43; @@ -152,9 +151,14 @@ 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))) { // + if (cancel_after > 0) { + cancel_counter++; + if (cancel_after == cancel_counter) break; + } continue; - + } trigger_threshold = 0; sample_total_numbers++; @@ -214,32 +218,40 @@ 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) +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) { - printConfig(); + if (!silent) printConfig(); LFSetupFPGAForADC(config.divisor, activeField); // Now call the acquisition routine - return DoAcquisition_config(false); + 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() +uint32_t SampleLF(bool printCfg, int sample_size) { - return ReadLF(true); + 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. @@ -248,5 +260,135 @@ uint32_t SampleLF() uint32_t SnoopLF() { - return ReadLF(false); + uint32_t ret = ReadLF(false, true, 0); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + return ret; +} + +/** +* 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 +#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; + 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; + } + 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; }