From: pwpiwi Date: Thu, 18 Jun 2015 13:30:56 +0000 (+0200) Subject: fixing iso14443b (issue #103): X-Git-Tag: v2.1.0~1^2~2 X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/da586b170276fd44963ec4a8934beaf563feb132 fixing iso14443b (issue #103): - revert removal of FPGA_HF_READER_RX_XCORR_848_KHZ. Need to be able to switch to 424kHz for ISO15693. --- diff --git a/armsrc/iso14443b.c b/armsrc/iso14443b.c index 80f93678..8d1a5cca 100644 --- a/armsrc/iso14443b.c +++ b/armsrc/iso14443b.c @@ -732,7 +732,7 @@ static void GetSamplesFor14443bDemod(int n, bool quiet) // Signal field is ON with the appropriate LED: LED_D_ON(); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); for(;;) { int behindBy = lastRxCounter - AT91C_BASE_PDC_SSC->PDC_RCR; @@ -929,7 +929,7 @@ void ReadSTMemoryIso14443b(uint32_t dwLast) // Signal field is on with the appropriate LED LED_D_ON(); FpgaWriteConfWord( - FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); SpinDelay(200); // First command: wake up the tag using the INITIATE command @@ -1091,7 +1091,7 @@ void RAMFUNC SnoopIso14443b(void) LEDsoff(); // And put the FPGA in the appropriate mode - FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_SNOOP); + FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ | FPGA_HF_READER_RX_XCORR_SNOOP); SetAdcMuxFor(GPIO_MUXSEL_HIPKD); // Setup for the DMA. @@ -1228,7 +1228,7 @@ void SendRawCommand14443B(uint32_t datalen, uint32_t recv, uint8_t powerfield, u */ // if(!GETBIT(GPIO_LED_D)) { // if field is off - // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR); + // FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_READER_RX_XCORR | FPGA_HF_READER_RX_XCORR_848_KHZ); // // Signal field is on with the appropriate LED // LED_D_ON(); // SpinDelay(200); diff --git a/fpga/fpga_hf.bit b/fpga/fpga_hf.bit index 717dad13..49bec224 100644 Binary files a/fpga/fpga_hf.bit and b/fpga/fpga_hf.bit differ diff --git a/fpga/fpga_hf.v b/fpga/fpga_hf.v index e84081b3..8a465e75 100644 --- a/fpga/fpga_hf.v +++ b/fpga/fpga_hf.v @@ -67,8 +67,10 @@ assign major_mode = conf_word[7:5]; // some fraction of the buffers) wire hi_read_tx_shallow_modulation = conf_word[0]; -// For the high-frequency receive correlator: -// whether to drive the coil (reader) or just short it (snooper) +// For the high-frequency receive correlator: frequency against which to +// correlate. +wire hi_read_rx_xcorr_848 = conf_word[0]; +// and whether to drive the coil (reader) or just short it (snooper) wire hi_read_rx_xcorr_snoop = conf_word[1]; // For the high-frequency simulated tag: what kind of modulation to use. @@ -97,7 +99,7 @@ hi_read_rx_xcorr hrxc( hrxc_ssp_frame, hrxc_ssp_din, ssp_dout, hrxc_ssp_clk, cross_hi, cross_lo, hrxc_dbg, - hi_read_rx_xcorr_snoop + hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop ); hi_simulate hs( diff --git a/fpga/hi_read_rx_xcorr.v b/fpga/hi_read_rx_xcorr.v index a6a99cd5..4a5de553 100644 --- a/fpga/hi_read_rx_xcorr.v +++ b/fpga/hi_read_rx_xcorr.v @@ -10,7 +10,7 @@ module hi_read_rx_xcorr( ssp_frame, ssp_din, ssp_dout, ssp_clk, cross_hi, cross_lo, dbg, - snoop + xcorr_is_848, snoop ); input pck0, ck_1356meg, ck_1356megb; output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4; @@ -20,7 +20,7 @@ module hi_read_rx_xcorr( output ssp_frame, ssp_din, ssp_clk; input cross_hi, cross_lo; output dbg; - input snoop; + input xcorr_is_848, snoop; // Carrier is steady on through this, unless we're snooping. assign pwr_hi = ck_1356megb & (~snoop); @@ -28,8 +28,22 @@ assign pwr_oe1 = 1'b0; assign pwr_oe3 = 1'b0; assign pwr_oe4 = 1'b0; -wire adc_clk = ck_1356megb; - +(* clock_signal = "yes" *) reg fc_div_2; +always @(negedge ck_1356megb) + fc_div_2 <= fc_div_2 + 1; + +(* clock_signal = "yes" *) reg adc_clk; +always @(xcorr_is_848, ck_1356megb, fc_div_2) +if (xcorr_is_848) + // The subcarrier frequency is fc/16; we will sample at fc, so that + // means the subcarrier is 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 ... + adc_clk <= ck_1356megb; +else + // The subcarrier frequency is fc/32; we will sample at fc/2, and + // the subcarrier will look identical. + adc_clk <= fc_div_2; + + // When we're a reader, we just need to do the BPSK demod; but when we're an // eavesdropper, we also need to pick out the commands sent by the reader, // using AM. Do this the same way that we do it for the simulated tag.