PS2 cut 1
[fpgaboy.git] / PS2Button.v
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1module PS2Button(
2 input inclk,
3 input indata,
bc75fc67 4 output wire [7:0] buttons
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5 );
6
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7 reg [3:0] bitcount = 0;
8 reg [7:0] key = 0;
9 reg keyarrow = 0, keyup = 0, parity = 0;
10 reg key_a = 0,key_b = 0,key_st = 0,key_sel = 0,key_up = 0,key_dn = 0,key_l = 0,key_r = 0;
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11
12 assign buttons = {key_st,key_sel,key_b,key_a,key_dn,key_up,key_l,key_r};
13
14 always @ (negedge inclk) begin
15 if(bitcount == 10) begin
16 bitcount <= 0;
17 if(parity == (^ key)) begin
18 if(keyarrow) begin
19 keyarrow <= 0;
20 case(key)
21 8'hF0: keyup <= 1;
22 8'h75: key_up <= 1;
23 8'h74: key_r <= 1;
24 8'h72: key_dn <= 1;
25 8'h6B: key_l <= 1;
26 endcase
27 end
28 else begin
29 if(keyup) begin
30 keyup <= 0;
31 case(key)
32 8'h75: key_up <= 0;
33 8'h74: key_r <= 0;
34 8'h72: key_dn <= 0;
35 8'h6B: key_l <= 0;
36 8'h1C: key_a <= 0;
37 8'h1B: key_b <= 0;
38 8'h5A: key_st <= 0;
39 8'h59: key_sel <= 0;
40 endcase
41 end
42 else begin
43 case(key)
44 8'hE0: keyarrow <= 1;
45 8'hF0: keyup <= 1;
46 8'h1C: key_a <= 1;
47 8'h1B: key_b <= 1;
48 8'h5A: key_st <= 1;
49 8'h59: key_sel <= 1;
50 endcase
51 end
52 end
53 end
54 else begin
55 keyarrow <= 0;
56 keyup <= 0;
57 {key_a,key_b,key_st,key_sel,key_up,key_dn,key_l,key_r} <= 8'b0;
58 end
59 end else
60 bitcount <= bitcount + 1;
61
62 case(bitcount)
63 1: key[0] <= indata;
64 2: key[1] <= indata;
65 3: key[2] <= indata;
66 4: key[3] <= indata;
67 5: key[4] <= indata;
68 6: key[5] <= indata;
69 7: key[6] <= indata;
70 8: key[7] <= indata;
71 9: parity <= indata;
72 endcase
73 end
74
75endmodule
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