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Bugfixes for LF FDX
[proxmark3-svn] / fpga / hi_sniffer.v
1 module hi_sniffer(
2 ck_1356meg,
3 pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,
4 adc_d, adc_clk,
5 ssp_frame, ssp_din, ssp_clk
6 );
7 input ck_1356meg;
8 output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;
9 input [7:0] adc_d;
10 output adc_clk;
11 output ssp_frame, ssp_din, ssp_clk;
12
13 // We are only snooping, all off.
14 assign pwr_hi = 1'b0;
15 assign pwr_lo = 1'b0;
16 assign pwr_oe1 = 1'b0;
17 assign pwr_oe2 = 1'b0;
18 assign pwr_oe3 = 1'b0;
19 assign pwr_oe4 = 1'b0;
20
21 reg ssp_frame;
22 reg [7:0] adc_d_out = 8'd0;
23 reg [2:0] ssp_cnt = 3'd0;
24
25 assign adc_clk = ck_1356meg;
26 assign ssp_clk = ~ck_1356meg;
27
28 always @(posedge ssp_clk)
29 begin
30 if(ssp_cnt[2:0] == 3'd7)
31 ssp_cnt[2:0] <= 3'd0;
32 else
33 ssp_cnt <= ssp_cnt + 1;
34
35 if(ssp_cnt[2:0] == 3'b000) // set frame length
36 begin
37 adc_d_out[7:0] <= adc_d;
38 ssp_frame <= 1'b1;
39 end
40 else
41 begin
42 adc_d_out[7:0] <= {1'b0, adc_d_out[7:1]};
43 ssp_frame <= 1'b0;
44 end
45
46 end
47
48 assign ssp_din = adc_d_out[0];
49
50 endmodule
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