在家实在闲的没事儿干，翻出来了大三上学期的EDA课的小实验，也就是设计一个二愣子交通灯啦，只会自己按设定好的时间闪,红灯、绿灯，黄灯和转向灯；
- 各灯显示时长：哎呀~ 懒得写了，后面程序里都有。
- 芯片：FPGA、Cylone IV E 系列的 EP4CE6E22C8，144引脚。
- 外置时钟：1Hz
以下是这个小实验的完整的程序：
module traffic(
input clk,
output reg r1,
output reg y1,
output reg g1,
output reg b1,
output reg r2,
output reg y2,
output reg g2,
output reg b2
);
parameter yellow_time = 5;
parameter green_time = 20;
parameter blue_time = 10;
reg [2:0] state;
always @(posedge clk)
case (state)
0: /*南北绿，东西红*/
begin
r1 <= 1'b0;
y1 <= 1'b0;
g1 <= 1'b1;
b1 <= 1'b0;
r2 <= 1'b1;
y2 <= 1'b0;
g2 <= 1'b0;
b2 <= 1'b0;
end
1: /*南北黄，东西红*/
begin
r1 <= 1'b0;
y1 <= 1'b1;
g1 <= 1'b0;
b1 <= 1'b0;
r2 <= 1'b1;
y2 <= 1'b0;
g2 <= 1'b0;
b2 <= 1'b0;
end
2: /*南北左转，东西红*/
begin
r1 <= 1'b0;
y1 <= 1'b0;
g1 <= 1'b0;
b1 <= 1'b1;
r2 <= 1'b1;
y2 <= 1'b0;
g2 <= 1'b0;
b2 <= 1'b0;
end
3: /*南北红，东西绿*/
begin
r1 <= 1'b1;
y1 <= 1'b0;
g1 <= 1'b0;
b1 <= 1'b0;
r2 <= 1'b0;
y2 <= 1'b0;
g2 <= 1'b1;
b2 <= 1'b0;
end
4: /*南北红，东西黄*/
begin
r1 <= 1'b1;
y1 <= 1'b0;
g1 <= 1'b0;
b1 <= 1'b0;
r2 <= 1'b0;
y2 <= 1'b1;
g2 <= 1'b0;
b2 <= 1'b0;
end
default: /*南北红，东西左转*/
begin
r1 <= 1'b1;
y1 <= 1'b0;
g1 <= 1'b0;
b1 <= 1'b0;
r2 <= 1'b0;
y2 <= 1'b0;
g2 <= 1'b0;
b2 <= 1'b1;
end
endcase
always @(posedge clk)
begin
reg [4:0] count;
begin
if(count == 0)
begin
if(state == 5)
state <= 0;
else
state <= state +1;
case (state)
0:
count = yellow_time;
1:
count = blue_time;
2:
count = green_time;
3:
count = yellow_time;
4:
count = blue_time;
default:
count = green_time;
endcase
end
else
count = count - 1;
end
end
endmodule
这个是引脚配置，书上都有哒，就是顺序老是配反，搞得我改了好几遍（其实本人很细心得啦QAQ）。
这个是最后的那个原理图
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文章来源: 博客园
原文链接: https://www.cnblogs.com/this-is-changjiang/p/12542326.html
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