verilog写超声波测距的数码管显示
时间: 2023-09-03 20:08:18 浏览: 99
超声波测距数码管显示
首先,需要通过超声波传感器测量距离,并将其转换为数字信号,然后通过数码管进行显示。下面是一个简单的Verilog代码示例:
```verilog
module ultrasonic_distance(
input clk,
input trig,
output reg [3:0] seg,
output reg [3:0] dig
);
reg [15:0] counter;
reg measure;
reg [3:0] distance;
always @(posedge clk) begin
if (counter < 16'd50000) begin
counter <= counter + 1;
end else begin
counter <= 0;
measure <= 1;
end
end
always @(posedge clk) begin
if (trig && !measure) begin
counter <= 0;
measure <= 1;
end
end
always @(posedge clk) begin
if (measure) begin
measure <= 0;
counter <= 0;
distance <= counter / 58; // 转换为厘米
end
end
always @(posedge clk) begin
case (distance)
0: seg = 4'b0011; // 显示0
1: seg = 4'b0001; // 显示1
2: seg = 4'b0101; // 显示2
3: seg = 4'b0100; // 显示3
4: seg = 4'b0110; // 显示4
5: seg = 4'b0110; // 显示5
6: seg = 4'b0111; // 显示6
7: seg = 4'b0004; // 显示7
8: seg = 4'b0111; // 显示8
9: seg = 4'b0110; // 显示9
default: seg = 4'b1111; // 显示空
endcase
end
always @(posedge clk) begin
dig <= 4'b1110; // 第一个数码管
#100;
dig <= 4'b1101; // 第二个数码管
#100;
dig <= 4'b1011; // 第三个数码管
#100;
dig <= 4'b0111; // 第四个数码管
end
endmodule
```
该模块有一个时钟输入 `clk`,一个触发输入 `trig`,和一个四位数码管显示输出。它使用一个计数器来测量超声波传感器返回的脉冲宽度,然后将其转换为距离(单位是厘米),并通过数码管进行显示。每个数码管的显示切换时间间隔为 100 个时钟周期。
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