From: Christopher Zihao Lu Date: Fri, 9 May 2008 12:00:28 +0000 (-0400) Subject: added PS2Button, PS2 keyboard -> buttons module X-Git-Url: http://git.joshuawise.com/fpgaboy.git/commitdiff_plain/6306dc0a42b06b5f253bb9ce6c5307761dcd419a?ds=sidebyside added PS2Button, PS2 keyboard -> buttons module --- diff --git a/PS2Button.v b/PS2Button.v new file mode 100644 index 0000000..e65226c --- /dev/null +++ b/PS2Button.v @@ -0,0 +1,81 @@ +module PS2Button( + input inclk, + input indata, + input rst, + output outclk, + output outdata, + output reg [7:0] buttons + ); + + assign outdata = 1'b1; + assign outclk = 1'b1; + + reg bitcount [3:0] = 0; + reg [7:0] key; + reg keyarrow, keyup, parity; + reg key_a,key_b,key_st,key_sel,key_up,key_dn,key_l,key_r; + + assign buttons = {key_st,key_sel,key_b,key_a,key_dn,key_up,key_l,key_r}; + + always @ (negedge inclk) begin + if(bitcount == 10) begin + bitcount <= 0; + if(parity == (^ key)) begin + if(keyarrow) begin + keyarrow <= 0; + case(key) + 8'hF0: keyup <= 1; + 8'h75: key_up <= 1; + 8'h74: key_r <= 1; + 8'h72: key_dn <= 1; + 8'h6B: key_l <= 1; + endcase + end + else begin + if(keyup) begin + keyup <= 0; + case(key) + 8'h75: key_up <= 0; + 8'h74: key_r <= 0; + 8'h72: key_dn <= 0; + 8'h6B: key_l <= 0; + 8'h1C: key_a <= 0; + 8'h1B: key_b <= 0; + 8'h5A: key_st <= 0; + 8'h59: key_sel <= 0; + endcase + end + else begin + case(key) + 8'hE0: keyarrow <= 1; + 8'hF0: keyup <= 1; + 8'h1C: key_a <= 1; + 8'h1B: key_b <= 1; + 8'h5A: key_st <= 1; + 8'h59: key_sel <= 1; + endcase + end + end + end + else begin + keyarrow <= 0; + keyup <= 0; + {key_a,key_b,key_st,key_sel,key_up,key_dn,key_l,key_r} <= 8'b0; + end + end else + bitcount <= bitcount + 1; + + case(bitcount) + 1: key[0] <= indata; + 2: key[1] <= indata; + 3: key[2] <= indata; + 4: key[3] <= indata; + 5: key[4] <= indata; + 6: key[5] <= indata; + 7: key[6] <= indata; + 8: key[7] <= indata; + 9: parity <= indata; + endcase + end + +endmodule