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fixing iso14443b (issue #103):

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- revert removal of FPGA_HF_READER_RX_XCORR_848_KHZ. Need to be able to switch to 424kHz for ISO15693.
This commit is contained in:
pwpiwi 2015-06-18 15:30:56 +02:00
parent 132a02179c
commit da586b1702
4 changed files with 26 additions and 10 deletions
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8
armsrc/iso14443b.c
View file

@ -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);

BIN
fpga/fpga_hf.bit
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8
fpga/fpga_hf.v
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@ -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(

20
fpga/hi_read_rx_xcorr.v
View file

@ -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.