git.zerfleddert.de Git - proxmark3-svn/blob - fpga/hi_sniffer.v

   1
   2 module hi_sniffer(
   3     pck0, ck_1356meg, ck_1356megb,
   4     pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,
   5     adc_d, adc_clk,
   6     ssp_frame, ssp_din, ssp_dout, ssp_clk,
   7     cross_hi, cross_lo,
   8     dbg,
   9     xcorr_is_848, snoop, xcorr_quarter_freq // not used.
  10 );
  11     input pck0, ck_1356meg, ck_1356megb;
  12     output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;
  13     input [7:0] adc_d;
  14     output adc_clk;
  15     input ssp_dout;
  16     output ssp_frame, ssp_din, ssp_clk;
  17     input cross_hi, cross_lo;
  18     output dbg;
  19     input xcorr_is_848, snoop, xcorr_quarter_freq; // not used.
  20
  21 // We are only snooping, all off.
  22 assign pwr_hi  = 1'b0;// ck_1356megb & (~snoop);
  23 assign pwr_oe1 = 1'b0;
  24 assign pwr_oe2 = 1'b0;
  25 assign pwr_oe3 = 1'b0;
  26 assign pwr_oe4 = 1'b0;
  27
  28 reg ssp_clk = 1'b0;
  29 reg ssp_frame;
  30 reg adc_clk;
  31 reg [7:0] adc_d_out = 8'd0;
  32 reg [7:0] ssp_cnt = 8'd0;
  33 reg [7:0] pck_divider = 8'd0;
  34 reg ant_lo = 1'b0;
  35 reg bit_to_send = 1'b0;
  36
  37 always @(ck_1356meg, pck0) // should synthetisize to a mux..
  38   begin
  39     adc_clk = ck_1356meg;
  40     ssp_clk = ~ck_1356meg;
  41   end
  42
  43 reg [7:0] cnt_test = 8'd0; // test
  44
  45 always @(posedge pck0)
  46 begin
  47     ant_lo <= 1'b0;
  48 end
  49
  50 always @(posedge ssp_clk) // ~1356 (hf)
  51 begin
  52   if(ssp_cnt[7:0] == 8'd255) // SSP counter for divides.
  53     ssp_cnt[7:0] <= 8'd0;
  54   else
  55     ssp_cnt <= ssp_cnt + 1;
  56
  57       if((ssp_cnt[2:0] == 3'b000) && !ant_lo) // To set frame  length
  58         begin
  59           adc_d_out[7:0] = adc_d; // disable for test
  60           bit_to_send = adc_d_out[0];
  61           ssp_frame <= 1'b1;
  62         end
  63       else
  64         begin
  65           adc_d_out[6:0] = adc_d_out[7:1];
  66           adc_d_out[7] = 1'b0; // according to old lf_read.v comment prevents gliches if not set.
  67           bit_to_send = adc_d_out[0];
  68           ssp_frame <= 1'b0;
  69         end
  70 end
  71
  72 assign ssp_din = bit_to_send && !ant_lo;//bit_to_send && !ant_lo; // && .. not needed i guess?
  73
  74 assign pwr_lo = ant_lo;
  75
  76
  77 endmodule