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楼主 |
发表于 2010-11-11 01:09:06
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显示全部楼层
附上程序：
module Ascii_Convert
(
input clk,
input shift,
input [7:0] key_data_r,
output reg [7:0] key_val,
output reg [7:0] key_val1,
output reg [7:0] key_val2,
output reg [7:0] key_val3,
output reg [7:0] key_val4
);
always@(posedge clk)
begin
case(key_data_r)
8'h1C : begin
key_val <= 8'h41;//"A"
end
8'h32 : key_val <= 8'h42;//"B"
8'h21 : key_val <= 8'h43;//"C"
8'h23 : key_val <= 8'h44;//"D"
8'h24 : key_val <= 8'h45;//"E"
8'h2B : key_val <= 8'h46;//"F"
8'h34 : key_val <= 8'h47;//"G"
8'h33 : key_val <= 8'h48;//"H"
8'h14 : begin //L CTRL
key_val <= 8'h4c;
key_val1<= 8'h43;
key_val2<= 8'h54;
key_val3<= 8'h52;
key_val4<= 8'h4c;
end
8'h14,8'hE0 : begin //R CTRL
key_val <= 8'h52;
key_val1<= 8'h43;
key_val2<= 8'h54;
key_val3<= 8'h52;
key_val4<= 8'h4c;
end
endcase
endmodule
但是发现在1602上R CTRL显示的还是L CTRL。。。不知道是哪里出了问题。。。请指教。。。
PS2的驱动程序
module PS2(
input clk,
input rst_n,
input ps2_clk,
input ps2_data,
output reg [7:0] key_data,
output reg key_r
);
reg [3:0] cnt;
reg ps2_clk1;
reg ps2_clk2;
reg [7:0] ps2_data_r;
wire ps2_clk_n = (~ps2_clk1) & ps2_clk2;
reg key_press;
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
begin
ps2_clk1 <= 0;
end
else
begin
ps2_clk1 <= ps2_clk;
end
end
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
ps2_clk2<=0;
else
ps2_clk2<=ps2_clk1;
end
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
cnt<=0;
else
if(ps2_clk_n)
begin
if(cnt<4'hA)
cnt<=cnt+1'b1;
else
cnt<=0;
end
end
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
ps2_data_r<=0;
else
if(ps2_clk_n)
begin
case(cnt)
1 : ps2_data_r[0] <= ps2_data;
2 : ps2_data_r[1] <= ps2_data;
3 : ps2_data_r[2] <= ps2_data;
4 : ps2_data_r[3] <= ps2_data;
5 : ps2_data_r[4] <= ps2_data;
6 : ps2_data_r[5] <= ps2_data;
7 : ps2_data_r[6] <= ps2_data;
8 : ps2_data_r[7] <= ps2_data;
default: ;
endcase
end
end
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
key_press<=0;
else
if(cnt==4'hA)
begin
if(ps2_data_r==8'hF0)
key_press<=1'b1;
else
key_press<=1'b0;
end
end
always @(posedge clk or negedge rst_n)
begin
if(!rst_n)
key_r<=0;
else
if(cnt==4'hA)
begin
if(!key_press)
begin
key_data <=ps2_data_r;
key_r<=1;
end
else
key_r<=0;
end
end
endmodule |
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发表于 2010-11-10 21:53:20
