功能描述
（1）定时启动正转20秒暂停10秒反转20秒暂 停10秒，定时未到回到"正转20秒暂停10秒......"，定时到则停止; 若定时到，则停机发出音响信号;
（2）用两个数码管显示洗涤的预置时间（默认10分钟），再用两个数码管按倒计时方式对各个洗涤状态过程作计时显示，直到 时间到停机；（3）洗涤过程由"开始"信号开始;
（4)三只LED灯表示"正转"，"反转"、"暂停"三个状态。
（5）用动态扫描控制四个数码管的输出
一、框架
输入：时钟、复位、开始按键
输出：LED指示灯 数码管段选和位选
这个板子段选是38译码器，所以sel是3位bit
二、verilog代码
控制模块实现
主要思想就是通过两层状态机进行控制：
首先控制空闲状态、工作状态以及结束状态。
其中围绕工作状态展开进行二次状态设计，正转、反转以及暂停等等。
Matlab
module control(
input clk,
input rst_n,
input key_start,
output wire led_R,
output wire led_L,
output wire led_P,
output reg [7:0] data_time,
output reg [7:0] sec_time
);
//����״̬�����С�������ֹͣ
parameter IDLE =3'd0;
parameter WORKING =3'd1;
parameter OVER =3'd2;
//����״̬�µ�״̬����ת ֹͣ ��ת
parameter W_IDLE =4'd0;
parameter R_ROTATE =4'd1;
parameter PAUSE1 =4'd2;
parameter L_ROTATE =4'd3;
parameter PAUSE2 =4'd4;
reg [2:0] state_all;
reg [3:0] state;
//10����
// reg [7:0] data_time;
// reg [7:0] sec_time;//��
reg [25:0] count;
assign led_R=(state_all==WORKING)?(state==R_ROTATE)?1'b1:1'b0:1'b0;
assign led_L=(state_all==WORKING)?(state==L_ROTATE)?1'b1:1'b0:1'b0;
assign led_P=(state_all==WORKING)?(state==PAUSE1 || state==PAUSE2)?1'b1:1'b0:1'b0;
//10����
always @(posedge clk or negedge rst_n) begin
if(!rst_n) begin
data_time<=8'h10;
end
else if(state_all==WORKING && state==PAUSE2 && count==49999999 && sec_time==8'h00)begin
if(data_time[3:0]==4'h0 && data_time[7:4]>4'h0)begin
data_time[3:0]<=4'h9;
data_time[7:4]<=data_time[7:4]-4'd1;
end
else if(data_time[3:0]>4'h0 && data_time[7:4]>=4'h0)begin
data_time[3:0]<=data_time[3:0]-4'd1;
data_time[7:4]<=data_time[7:4];
end
else if(data_time[3:0]==4'h0 && data_time[7:4]==4'h0)begin
data_time[3:0]<=data_time[3:0];
data_time[7:4]<=data_time[7:4];
end
end
else if(state_all==IDLE || state_all==OVER )begin
data_time<=8'h10;
end
end
Matlab
//��ת�ͷ�ת����ͣ������
always @(posedge clk or negedge rst_n) begin
if(!rst_n) begin
sec_time<=8'h20;
end
else if(count==49999999 && (state==R_ROTATE || state==L_ROTATE))begin
if(sec_time[3:0]==4'h0 && sec_time[7:4]>4'h0)begin
sec_time[3:0]<=4'h9;
sec_time[7:4]<=sec_time[7:4]-4'd1;
end
else if(sec_time[3:0]>4'h0 && sec_time[7:4]>=4'h0)begin
sec_time[3:0]<=sec_time[3:0]-4'd1;
sec_time[7:4]<=sec_time[7:4];
end
else if(sec_time[3:0]==4'h0 && sec_time[7:4]==4'h0)begin
sec_time<=8'h10;
end
end
else if(count==49999999 && (state==PAUSE1 || state==PAUSE2))begin
if(sec_time[3:0]==4'h0 && sec_time[7:4]>4'h0)begin
sec_time[3:0]<=4'h9;
sec_time[7:4]<=sec_time[7:4]-4'd1;
end
else if(sec_time[3:0]>4'h0 && sec_time[7:4]>=4'h0)begin
sec_time[3:0]<=sec_time[3:0]-4'd1;
sec_time[7:4]<=sec_time[7:4];
end
else if(sec_time[3:0]==4'h0 && sec_time[7:4]==4'h0)begin
sec_time<=8'h20;
end
end
else if(state==W_IDLE)begin
sec_time<=8'h20;
end
end
//1��������
always @(posedge clk or negedge rst_n) begin
if(!rst_n) begin
count<=26'd0;
end
else if(state==R_ROTATE || state==PAUSE1|| state==L_ROTATE|| state==PAUSE2)begin
if(count<49999999)begin
count<=count+1;
end
else begin
count<=26'd0;
end
end
else begin
count<=26'd0;
end
end
//��״̬�л�
always @(posedge clk or negedge rst_n) begin
if(!rst_n) begin
state <= W_IDLE;
end
else if(state_all==WORKING)begin
case(state)
W_IDLE:begin
state<=R_ROTATE;
end
R_ROTATE:begin
if(count==49999999 && sec_time==8'h00)begin
state<=PAUSE1;
end
else begin
state<=R_ROTATE;
end
end
PAUSE1:begin
if(count==49999999 && sec_time==8'h00)begin
state<=L_ROTATE;
end
else begin
state<=PAUSE1;
end
end
L_ROTATE:begin
if(count==49999999 && sec_time==8'h00)begin
state<=PAUSE2;
end
else begin
state<=L_ROTATE;
end
end
PAUSE2:begin
if(count==49999999 && sec_time==8'h00)begin
state<=W_IDLE;
end
else begin
state<=PAUSE2;
end
end
default:state <= W_IDLE;
endcase
end
else begin
state <= W_IDLE;
end
end
//�ܹ���״̬�л�
always @(posedge clk or negedge rst_n) begin
if(!rst_n) begin
state_all <= IDLE;
end
else begin
case(state_all)
IDLE:begin
if(key_start==1'b1)begin
state_all<=WORKING;
end
else begin
state_all<=IDLE;
end
end
WORKING:begin
if(data_time==8'h00)begin
state_all<=OVER;
end
else begin
state_all<=WORKING;
end
end
OVER:begin
state_all<=IDLE;
end
default:state_all <= IDLE;
endcase
end
end
endmodule三、视频上板效果展示
基于fpga的洗衣机控制器 定时器