X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f6d9fb173fec6d117faeb6c39cf37ee449d4ef16..31abe49fd323411b391dd10335eb4c60cfcecb06:/armsrc/lfops.c diff --git a/armsrc/lfops.c b/armsrc/lfops.c index c1031447..43af4eed 100644 --- a/armsrc/lfops.c +++ b/armsrc/lfops.c @@ -15,231 +15,44 @@ #include "crc16.h" #include "string.h" #include "lfdemod.h" +#include "lfsampling.h" -uint8_t decimation = 1; -uint8_t bits_per_sample = 8; -bool averaging = 1; - - -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) -{ - int bytepos = stream->position >> 3; // divide by 8 - int bitpos = stream->position & 7; - *(stream->buffer+bytepos) |= (bit > 0) << (7 - bitpos); - stream->position++; - stream->numbits++; -} /** - * Does the sample acquisition. If threshold is specified, the actual sampling - * is not commenced until the threshold has been reached. - * This method implements decimation and quantization in order to - * be able to provide longer sample traces. - * Uses the following global settings: - * - decimation - how much should the signal be decimated. A decimation of N means we keep 1 in N samples, etc. - * - bits_per_sample - bits per sample. Max 8, min 1 bit per sample. - * - averaging If set to true, decimation will use averaging, so that if e.g. decimation is 3, the sample - * value that will be used is the average value of the three samples. - * - * @param trigger_threshold - a threshold. The sampling won't commence until this threshold has been reached. Set - * to -1 to ignore threshold. - * @param silent - is true, now outputs are made. If false, dbprints the status - * @return the number of bits occupied by the samples. + * Function to do a modulation and then get samples. + * @param delay_off + * @param period_0 + * @param period_1 + * @param command */ -uint32_t DoAcquisition125k_internal(int trigger_threshold,bool silent) -{ - //. - uint8_t *dest = (uint8_t *)BigBuf; - int bufsize = BIGBUF_SIZE; - memset(dest, 0, bufsize); - - if(bits_per_sample < 1) bits_per_sample = 1; - if(bits_per_sample > 8) bits_per_sample = 8; - - if(decimation < 1) decimation = 1; - - // Use a bit stream to handle the output - BitstreamOut data = { dest , 0, 0}; - int sample_counter = 0; - uint8_t sample = 0; - //If we want to do averaging - uint32_t sample_sum =0 ; - uint32_t sample_total_numbers =0 ; - uint32_t sample_total_saved =0 ; - - while(!BUTTON_PRESS()) { - 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(); - if (trigger_threshold != -1 && sample < trigger_threshold) - continue; - - trigger_threshold = -1; - sample_total_numbers++; - - if(averaging) - { - sample_sum += sample; - } - //Check decimation - if(decimation > 1) - { - sample_counter++; - if(sample_counter < decimation) continue; - sample_counter = 0; - } - //Averaging - if(averaging && decimation > 1) { - sample = sample_sum / decimation; - sample_sum =0; - } - //Store the sample - sample_total_saved ++; - if(bits_per_sample == 8){ - dest[sample_total_saved-1] = sample; - data.numbits = sample_total_saved << 3;//Get the return value correct - if(sample_total_saved >= bufsize) break; - } - else{ - pushBit(&data, sample & 0x80); - if(bits_per_sample > 1) pushBit(&data, sample & 0x40); - if(bits_per_sample > 2) pushBit(&data, sample & 0x20); - if(bits_per_sample > 3) pushBit(&data, sample & 0x10); - if(bits_per_sample > 4) pushBit(&data, sample & 0x08); - if(bits_per_sample > 5) pushBit(&data, sample & 0x04); - if(bits_per_sample > 6) pushBit(&data, sample & 0x02); - //Not needed, 8bps is covered above - //if(bits_per_sample > 7) pushBit(&data, sample & 0x01); - if((data.numbits >> 3) +1 >= bufsize) break; - } - } - } - - if(!silent) - { - Dbprintf("Done, saved %d out of %d seen samples at %d bits/sample",sample_total_saved, sample_total_numbers,bits_per_sample); - Dbprintf("buffer samples: %02x %02x %02x %02x %02x %02x %02x %02x ...", - dest[0], dest[1], dest[2], dest[3], dest[4], dest[5], dest[6], dest[7]); - } - return data.numbits; -} -/** -* Perform sample aquisition. -*/ -void DoAcquisition125k(int trigger_threshold) -{ - DoAcquisition125k_internal(trigger_threshold, false); -} - -/** -* Setup the FPGA to listen for samples. This method downloads the FPGA bitstream -* if not already loaded, sets divisor and starts up the antenna. -* @param divisor : 1, 88> 255 or negative ==> 134.8 KHz -* 0 or 95 ==> 125 KHz -* -**/ -void LFSetupFPGAForADC(int divisor, bool lf_field) -{ - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); - if ( (divisor == 1) || (divisor < 0) || (divisor > 255) ) - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 88); //134.8Khz - else if (divisor == 0) - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, 95); //125Khz - else - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor); - - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | (lf_field ? FPGA_LF_ADC_READER_FIELD : 0)); - - // Connect the A/D to the peak-detected low-frequency path. - SetAdcMuxFor(GPIO_MUXSEL_LOPKD); - // 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(); -} -/** -* Initializes the FPGA, and acquires the samples. -**/ -void AcquireRawAdcSamples125k(int divisor,int arg1, int arg2) -{ - if (arg1 != 0) - { - averaging = (arg1 & 0x80) != 0; - bits_per_sample = (arg1 & 0x0F); - } - if(arg2 != 0) - { - decimation = arg2; - } - - Dbprintf("Sampling config: "); - Dbprintf(" divisor: %d ", divisor); - Dbprintf(" bps: %d ", bits_per_sample); - Dbprintf(" decimation: %d ", decimation); - Dbprintf(" averaging: %d ", averaging); - - LFSetupFPGAForADC(divisor, true); - // Now call the acquisition routine - DoAcquisition125k_internal(-1,false); -} -/** -* Initializes the FPGA for snoop-mode, and acquires the samples. -**/ - -void SnoopLFRawAdcSamples(int divisor, int trigger_threshold) -{ - LFSetupFPGAForADC(divisor, false); - DoAcquisition125k(trigger_threshold); -} - void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, uint8_t *command) { - /* Make sure the tag is reset */ - FpgaDownloadAndGo(FPGA_BITSTREAM_LF); - FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); - SpinDelay(2500); - - int divisor_used = 95; // 125 KHz // see if 'h' was specified if (command[strlen((char *) command) - 1] == 'h') divisor_used = 88; // 134.8 KHz + sample_config sc = { 0,0,1, divisor_used, 0}; + setSamplingConfig(&sc); - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used); - FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); - // Give it a bit of time for the resonant antenna to settle. - SpinDelay(50); + /* Make sure the tag is reset */ + FpgaDownloadAndGo(FPGA_BITSTREAM_LF); + FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); + SpinDelay(2500); - // And a little more time for the tag to fully power up - SpinDelay(2000); + LFSetupFPGAForADC(sc.divisor, 1); - // Now set up the SSC to get the ADC samples that are now streaming at us. - FpgaSetupSsc(); + // And a little more time for the tag to fully power up + SpinDelay(2000); // now modulate the reader field while(*command != '\0' && *command != ' ') { FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); SpinDelayUs(delay_off); - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used); + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc.divisor); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); LED_D_ON(); @@ -251,14 +64,16 @@ void ModThenAcquireRawAdcSamples125k(int delay_off, int period_0, int period_1, FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF); LED_D_OFF(); SpinDelayUs(delay_off); - FpgaSendCommand(FPGA_CMD_SET_DIVISOR, divisor_used); + FpgaSendCommand(FPGA_CMD_SET_DIVISOR, sc.divisor); FpgaWriteConfWord(FPGA_MAJOR_MODE_LF_ADC | FPGA_LF_ADC_READER_FIELD); // now do the read - DoAcquisition125k(-1); + DoAcquisition_config(false); } + + /* blank r/w tag data stream ...0000000000000000 01111111 1010101010101010101010101010101010101010101010101010101010101010 @@ -745,8 +560,8 @@ void CmdHIDdemodFSK(int findone, int *high, int *low, int ledcontrol) WDT_HIT(); if (ledcontrol) LED_A_ON(); - DoAcquisition125k_internal(-1,true); - // FSK demodulator + DoAcquisition_default(-1,true); + // FSK demodulator size = HIDdemodFSK(dest, sizeof(BigBuf), &hi2, &hi, &lo); WDT_HIT(); @@ -833,8 +648,8 @@ void CmdEM410xdemod(int findone, int *high, int *low, int ledcontrol) WDT_HIT(); if (ledcontrol) LED_A_ON(); - DoAcquisition125k_internal(-1,true); - size = sizeof(BigBuf); + DoAcquisition_default(-1,true); + size = sizeof(BigBuf); //Dbprintf("DEBUG: Buffer got"); //askdemod and manchester decode errCnt = askmandemod(dest, &size, &clk, &invert); @@ -884,8 +699,8 @@ void CmdIOdemodFSK(int findone, int *high, int *low, int ledcontrol) while(!BUTTON_PRESS()) { WDT_HIT(); if (ledcontrol) LED_A_ON(); - DoAcquisition125k_internal(-1,true); - //fskdemod and get start index + DoAcquisition_default(-1,true); + //fskdemod and get start index WDT_HIT(); idx = IOdemodFSK(dest,sizeof(BigBuf)); if (idx>0){ @@ -1489,7 +1304,9 @@ int DemodPCF7931(uint8_t **outBlocks) { int lmin=128, lmax=128; uint8_t dir; - AcquireRawAdcSamples125k(0,0,0); + LFSetupFPGAForADC(95, true); + DoAcquisition_default(0, 0); + lmin = 64; lmax = 192;