失败的状态机与led灯&&修改

最新推荐文章于 2023-12-07 21:07:09 发布

原创最新推荐文章于 2023-12-07 21:07:09 发布 · 279 阅读

0 ·

CC 4.0 BY-SA版权

FPGA菜鸟之路专栏收录该内容

8 篇文章

订阅专栏

本文介绍了一个使用Verilog编写的LED状态机控制模块。该模块通过不同的状态切换来控制LED灯的显示，并且详细展示了从计数器到状态转移的实现逻辑。尽管程序能够运行，但存在一些未明状态的问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 14:50:08 09/04/2018
// Design Name:
// Module Name: ledstate
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
//module ledstate(
//input clk,
//input rst,
//input switch,
//output reg[7:0] led
//);
//
//reg start;
//reg[3:0] cnt;
//always@(posedge clk or negedge rst)
//if(!rst) cnt <= 4'd0;
//else if(cnt == 4'hf)
//begin start <= 1'b1;
// cnt <= 4'd0;
// end
//else begin cnt <= cnt+1'b1;
// start <= 1'b0;
// end
//
//reg[2:0] cstate,nstate;
//parameter idle = 3'b000;
//parameter second = 3'b001;
//parameter third = 3'b010;
//parameter four = 3'b011;
//parameter five = 3'b100;
//
////逻辑的变化
//always@(start or rst)
//if(!rst) cstate <= idle;
//else begin
//case(cstate)
//idle:if(!switch && start) nstate <= second;
// else nstate <= idle;
//second:if(start) nstate <= third;
// else nstate <= second;
//third:if(start) nstate <= four;
//else nstate <= third;
//four:if(start) nstate <= five;
//else nstate <= four;
//five: nstate <= idle;
//default nstate <= idle;
//endcase
//end
//
////状态对应的行为
//always@(start or rst)
//if(!rst)
//begin cstate <= idle;
//end
//else begin
//case(nstate)
//idle:led <= 8'b00000000;
//second:led <= 8'b00110011;
//third:led <= 8'b11001100;
//four:led <= 8'b10101010;
//five:led <= 8'b00000000;
//endcase
//end
//
//wire [35:0] CONTROL;
//wire [15:0] TRIG0;
//ledstate_icon stateicon (
// .CONTROL0(CONTROL) // INOUT BUS [35:0]
//);
//ledstate_ila stateila (
// .CONTROL(CONTROL), // INOUT BUS [35:0]
// .CLK(clk), // IN
// .TRIG0(TRIG0) // IN BUS [15:0]
//);
//
//assign TRIG0[15:12] = cnt;
//assign TRIG0[11] = start;
//assign TRIG0[10] = switch;
//assign TRIG0[9] = led[7];
//assign TRIG0[8] = led[6];
//assign TRIG0[7] = led[5];
//assign TRIG0[6] = led[4];
//assign TRIG0[5] = led[3];
//assign TRIG0[4] = led[2];
//assign TRIG0[3] = led[1];
//assign TRIG0[2] = led[0];
//assign TRIG0[1] = rst;
//assign TRIG0[0] = clk;
//
//endmodule
//

这个程序的语法及综合没有问题，但是状态机却没有按照理想的往下跑，要进一步修改，再充充电

经过一天的资料搜索与修改，最终写出了还存在小问题的程序，问题是led灯的转变过程存在不明状态

module ledstate(
input clk,
input rst,
input switch,
output reg[7:0] led
);

reg start;
reg[23:0] cnt;
always@(posedge clk or negedge rst)
if(!rst) cnt <= 24'd0;
else if(cnt == 24'hffffff)
begin start <= ~start;
cnt <= 24'd0;
end
else cnt <= cnt+1'b1;

reg[3:0] cstate;
parameter idle = 4'b0000;
parameter second = 4'b0001;
parameter third = 4'b0010;
parameter four = 4'b0100;
parameter five = 4'b1000;

//逻辑的变化
always@(posedge clk or negedge rst)
if(!rst) cstate <= idle;
else begin
case(cstate)
idle:if(start) begin
led <= 8'b11111111;
cstate <= second;
end
else cstate <= idle;

second:if(start) begin
led <= 8'b11110011;
cstate <= third;
end
else cstate <= second;

third:if(start) begin
led <= 8'b10110011;
cstate <= four;
end
else cstate <= third;

four:if(start) begin
led <= 8'b10101010;
cstate <= five;
end
else cstate <= four;

five:if(start) begin
led <= 8'b00000000;
cstate <= idle;
end
else cstate <= five;

default cstate <= idle;
endcase
end

wire [35:0] CONTROL;
wire [15:0] TRIG0;
ledstate_icon stateicon (
.CONTROL0(CONTROL) // INOUT BUS [35:0]
);
ledstate_ila stateila (
.CONTROL(CONTROL), // INOUT BUS [35:0]
.CLK(clk), // IN
.TRIG0(TRIG0) // IN BUS [15:0]
);

assign TRIG0[11] = start;
assign TRIG0[10] = switch;
assign TRIG0[9] = led[7];
assign TRIG0[8] = led[6];
assign TRIG0[7] = led[5];
assign TRIG0[6] = led[4];
assign TRIG0[5] = led[3];
assign TRIG0[4] = led[2];
assign TRIG0[3] = led[1];
assign TRIG0[2] = led[0];
assign TRIG0[1] = rst;
assign TRIG0[0] = clk;

endmodule