帮忙看下这个状态机代码，数码管显示00的时间有点长，不... (amobbs.com 阿莫电子技术论坛) -

orange-208 发表于 2012-9-13 15:39:25

帮忙看下这个状态机代码，数码管显示00的时间有点长，不...

如题

module traffic_state
(
clk_1Hz,
nrst,
one_data,
ten_data,
led_zhu,
led_zhi
);

input clk_1Hz, nrst;

output led_zhu; //led_zhu 红，led_zhu 黄，led_zhu 绿
output led_zhi; //led_zhi 红，led_zhi 黄，led_zhi 绿
output one_data; //倒计时个位
output ten_data; //倒计时十位

/***************四种工作状态***************/

parameter state_0 = 2'b00,
state_1 = 2'b01,
state_2 = 2'b10,
state_3 = 2'b11;

/******************************交通状态转换*****************************/

reg light_zhu; //light_zhu 红，light_zhu 黄，light_zhu 绿
reg light_zhi; //light_zhi 红，light_zhi 黄，light_zhi 绿

reg flag;
reg CS, NS;
reg count_H, count_L;

always @ ( posedge clk_1Hz or negedge nrst )
if( !nrst )
begin
CS <= state_0;
flag <= 3'b000;
end
else
case( CS )
state_0: if( flag == 3'b000 )//状态state_0, 主干道通行35s
begin
flag <= 3'b001;
state_0_init;
end
else if( flag == 3'b001 )
begin
if( !count_H && !count_L )
begin
flag <= 3'b010;
CS <= state_1;
end
else if( !count_L )
begin
count_L <= 4'b1001;
count_H <= count_H-1'b1;
end
else
begin
count_L <= count_L-1'b1;
end
end

state_1: if( flag== 3'b010 )//状态state_1,主干道黄灯倒计时5s
begin
flag <= 3'b011;
state_1_init;
end
else if( flag == 3'b011 )
begin
if( !count_L )
begin
flag <= 3'b100;
CS <= state_2;
end
else
begin
count_L <= count_L-1'b1;
end
end

state_2: if( flag == 3'b100 )//状态state_2,支干道通行25s
begin
flag <= 3'b101;
state_2_init;
end
else if( flag == 3'b101 )
begin
if( !count_H && !count_L )
begin
flag <= 3'b110;
CS <= state_3;
end
else if( !count_L )
begin
count_L <= 4'b1001;
count_H <= count_H-1'b1;
end
else
begin
count_L <= count_L-1'b1;
end
end

state_3: if( flag == 3'b110 )//状态state_3,支干道黄灯倒计时5s
begin
flag <= 3'b111;
state_3_init;
end
else if( flag == 3'b111 )
begin
if( !count_L )
begin
flag <= 3'b000;
CS <= state_0;
end
else
begin
count_L <= count_L-1'b1;
end
end
endcase

/*************************************/

task state_0_init;
begin
count_H <= 4'b0011; //高位为3
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b001;
light_zhi <= 3'b100;
end
endtask

/*************************************/

task state_1_init;
begin
count_H <= 4'b0000; //高位为0
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b010;
light_zhi <= 3'b100;
end
endtask

/*************************************/

task state_2_init;
begin
count_H <= 4'b0010; //高位为2
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b100;
light_zhi <= 3'b001;
end
endtask

/*************************************/

task state_3_init;
begin
count_H <= 4'b0000; //高位为0
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b100;
light_zhi <= 3'b010;
end
endtask

/**************************/

assign one_data = count_L;
assign ten_data = count_H;

assign led_zhu = light_zhu;
assign led_zhi = light_zhi;

/**************************/

endmodule

orange-208 发表于 2012-9-13 15:40:14

顶起！

orange-208 发表于 2012-9-13 15:56:20

刚才仔细看了下实验现象，就是递减至0时，要停1S才向下一个状态执行！

lgg88 发表于 2012-9-13 15:58:09

是每次到00的显示时间都长还是？有多长？

orange-208 发表于 2012-9-13 15:59:28

lgg88 发表于 2012-9-13 15:58 static/image/common/back.gif
是每次到00的显示时间都长还是？有多长？

1S左右

lgg88 发表于 2012-9-13 16:05:22

那应该是正常的，你要1S才会进入always ,所以要等1S状态才会改变

orange-208 发表于 2012-9-13 16:09:03

lgg88 发表于 2012-9-13 16:05 static/image/common/back.gif
那应该是正常的，你要1S才会进入always ,所以要等1S状态才会改变

如果想把这1S去掉呢？

lgg88 发表于 2012-9-13 16:15:18

你在上一个状态结束，置下一个状态值的时候，就把那个值初始化掉应该就可以了

orange-208 发表于 2012-9-13 16:31:37

lgg88 发表于 2012-9-13 16:15 static/image/common/back.gif
你在上一个状态结束，置下一个状态值的时候，就把那个值初始化掉应该就可以了 ...

先谢了！试试

orange-208 发表于 2012-9-13 16:51:04

lgg88 发表于 2012-9-13 16:15 static/image/common/back.gif
你在上一个状态结束，置下一个状态值的时候，就把那个值初始化掉应该就可以了 ...

按照你说的，搞定了！再次谢谢！

orange-208 发表于 2012-9-13 17:13:28

lgg88 发表于 2012-9-13 16:15 static/image/common/back.gif
你在上一个状态结束，置下一个状态值的时候，就把那个值初始化掉应该就可以了 ...

又有新问题，那就是我每次按下复位键之后，要等个位为0之后才复位显示，复位延迟这么长时间？

代码如下！

orange-208 发表于 2012-9-13 17:13:53

module traffic_state
(
clk_1Hz,
nrst,
one_data,
ten_data,
led_zhu,
led_zhi
);

input clk_1Hz, nrst;

output led_zhu; //led_zhu 红，led_zhu 黄，led_zhu 绿
output led_zhi; //led_zhi 红，led_zhi 黄，led_zhi 绿
output one_data; //倒计时个位
output ten_data; //倒计时十位

/***************四种工作状态***************/

parameter state_0 = 2'b00,
state_1 = 2'b01,
state_2 = 2'b10,
state_3 = 2'b11;

/******************************交通状态转换*****************************/

reg light_zhu; //light_zhu 红，light_zhu 黄，light_zhu 绿
reg light_zhi; //light_zhi 红，light_zhi 黄，light_zhi 绿

reg CS;
reg flag;
reg count_H, count_L;

always @ ( posedge clk_1Hz or negedge nrst )
if( !nrst )
begin
CS <= state_3;
flag <= 2'b11;
end
else
case( CS )
state_0: if( flag == 2'b00 ) //状态state_0, 主干道通行35s
begin
if( !count_H && !count_L )
begin
flag <= 2'b01;
CS <= state_1;
state_1_init; //初始化state_1
end
else if( !count_L )
begin
count_L <= 4'b1001;
count_H <= count_H-1'b1;
end
else
begin
count_L <= count_L-1'b1;
end
end

state_1: if( flag == 2'b01 ) //状态state_1,主干道黄灯倒计时5s
begin
if( !count_L )
begin
flag <= 2'b10;
CS <= state_2;
state_2_init; //初始化state_2
end
else
begin
count_L <= count_L-1'b1;
end
end

state_2: if( flag == 2'b10 ) //状态state_2,支干道通行25s
begin
if( !count_H && !count_L )
begin
flag <= 2'b11;
CS <= state_3;
state_3_init; //初始化state_3
end
else if( !count_L )
begin
count_L <= 4'b1001;
count_H <= count_H-1'b1;
end
else
begin
count_L <= count_L-1'b1;
end
end

state_3: if( flag == 2'b11 )//状态state_3,支干道黄灯倒计时5s
begin
if( !count_L )
begin
flag <= 2'b00;
CS <= state_0;
state_0_init; //初始化state_0
end
else
begin
count_L <= count_L-1'b1;
end
end

default: begin
CS <= state_3;
end

endcase

/*************************************/

task state_0_init;
begin
count_H <= 4'b0011; //高位为3
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b100; //light_zhu:0 , light_zhu:0 , light_zhu:1
light_zhi <= 3'b001; //light_zhi:0 , light_zhi:0 , light_zhi:1
end
endtask

/*************************************/

task state_1_init;
begin
count_H <= 4'b0000; //高位为0
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b010;
light_zhi <= 3'b001;
end
endtask

/*************************************/

task state_2_init;
begin
count_H <= 4'b0010; //高位为2
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b001;
light_zhi <= 3'b100;
end
endtask

/*************************************/

task state_3_init;
begin
count_H <= 4'b0000; //高位为0
count_L <= 4'b0101; //低位为5
light_zhu <= 3'b001;
light_zhi <= 3'b010;
end
endtask

/**************************/

assign one_data = count_L;
assign ten_data = count_H;

assign led_zhu = light_zhu;
assign led_zhi = light_zhi;

/**************************/

endmodule

orange-208 发表于 2012-9-13 17:15:46

也就是说每次要等到 count_L 为0时才进行复位！

lgg88 发表于 2012-9-13 19:17:07

你程序这样写的啊，你把!nrst后，你为什么进入状态3 呢直接执行复位就可以了啊

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帮忙看下这个状态机代码，数码管显示00的时间有点长，不...