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核心板，接口板，第一次焊贴片IC，焊得不好，工业酒精洗板容易残留白渣，怎么解决？请教！呵呵

合影，下面开始做实验....

谢谢，大学时候还玩过，现在焊得少了！呵呵

我这就换个背景咯！那个是在实验室的焊接台上直接就拍了，呵呵

1.闪烁灯、跑马灯、流水灯演示
由于这三个实验很类似，我把这个三个效果一并实现了，以下是演示视频和代码
http://v.youku.com/v_show/id_XNDY0NDIzMTI4.html



module LED_all(clk,rst_n,led);
 input clk;
 input rst_n;
 output[7:0] led;
 
 reg[23:0] count;
 reg[7:0] led_t;
 reg[1:0] indicator;
 reg[2:0] sec;
 
 
 always @(posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   count = 24'b0;
  else
   count = count+1'b1;
 end
   
 always @(posedge clk or negedge rst_n)
 begin 
  if(!rst_n)
  begin 
   led_t = 8'b11111111;
   indicator = 2'b0;
   sec = 3'b0;
  end
  else if(count == 24'hfffff)
  begin
   case(indicator)
   2'b00:
   begin 
    led_t = led_t << 1;
    if(led_t == 8'b0)
    begin 
     led_t = 8'b11111110; 
     indicator = 2'b01;
    end
   end
   2'b01:
   begin 
    led_t = led_t << 1;
    led_t[0] = 1'b1;
    if(led_t == 8'b11111111)
    begin 
     led_t = 8'b01010101;
     indicator = 2'b10;
    end
   end
   2'b10:
   begin 
    led_t = ~led_t;
    sec = sec + 1'b1;
    if(sec == 3'b111)
    begin
     led_t = 8'b11111111;
     indicator = 2'b00; 
    end
   end
   default:
   begin
    led_t = 8'b11111111;
    indicator = 2'b00;
    sec = 3'b000;
   end
   endcase
    
  end
 end
     
 assign led = led_t;  
   
endmodule

2、8个按键控制8个LED的点亮

以下是视频与代码
http://v.youku.com/v_show/id_XNDY0OTI1NjE2.html



module Key_led(key,led,clk,rst_n);
 input[7:0] key;
 output[7:0] led;
 input clk;
 input rst_n;
 
 reg[19:0] cnt;
 reg[7:0] led_r;
 reg[7:0] key_t;
 reg cnt_sta;
 
 always@(posedge clk or negedge rst_n)
 begin 
  if(!rst_n)
   cnt = 20'b0;
  else if(cnt_sta)
   cnt = cnt + 1'b1;
 end
 
 wire delay_over = cnt == 20'hfffff;
 
 always@(posedge clk or negedge rst_n)
 begin 
  if(!rst_n)
  begin 
   key_t = 8'b11111111;
   cnt_sta = 0;
  end
  else if((key ^ 8'b11111111) != 8'b0)
  begin 
   key_t = key;
   cnt_sta = 1;
   if(delay_over == 1'b1)
    cnt_sta = 0;
  end 
  
  else if(delay_over == 1'b1)
  begin
   cnt_sta = 0;
  end
 end
   
 always@(posedge clk or negedge rst_n)
 begin 
  if(!rst_n)
   led_r = 8'b0;   
  else if(delay_over == 1'b1)
  begin 
   if(key == key_t)
    led_r = key_t; 
  end
 end
 
 assign led = led_r;
 
endmodule

3.DIP指拨开关

这个代码太简单，就懒得贴了啊！
http://v.youku.com/v_show/id_XNDY1MTY2MDA4.html

4.数码管静态显示

http://v.youku.com/v_show/id_XNDY1MTY2NjMy.html
有一位数码管坏了，检查电路板，发现焊接正常，能演示功能就好！




module Seg7_static(clk,rst_n,dig_t,seg_t);
 input clk;
 input rst_n;
 output[7:0] dig_t;
 output[7:0] seg_t;
 
 reg[23:0] cnt;
 reg next;
 reg[3:0] data;
 reg[7:0] dig_t;
 reg[7:0] seg_t;
 
 always@(posedge clk or negedge rst_n)
 begin
  if(!rst_n)
  begin 
   cnt = 24'b0;
   dig_t = 8'b11111111;
  end
  else
  begin 
   cnt = cnt + 1'b1;
   dig_t = 8'b0;
  end
 end
   
 always@(posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   next = 1'b0;
  else if(cnt == 24'hffffff)
   next = 1'b1;
  else
   next = 1'b0; 
 end
 
 always@(posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   data = 4'h0;
  else if(next)
   data = data + 1'b1;
 end
 
 always@(posedge clk or negedge rst_n)
 begin
  if(!rst_n)
   seg_t = 8'h00;
  else
   case(data)
    4'h0:seg_t = 8'hc0;
    4'h1:seg_t = 8'hf9;
    4'h2:seg_t = 8'ha4;
    4'h3:seg_t = 8'hb0;
    4'h4:seg_t = 8'h99;
    4'h5:seg_t = 8'h92;
    4'h6:seg_t = 8'h82;
    4'h7:seg_t = 8'hf8;
    4'h8:seg_t = 8'h80;
    4'h9:seg_t = 8'h90;
    4'ha:seg_t = 8'h88;
    4'hb:seg_t = 8'h83;
    4'hc:seg_t = 8'hc6;
    4'hd:seg_t = 8'ha1;
    4'he:seg_t = 8'h86;
    4'hf:seg_t = 8'h8e;
   endcase
 end
endmodule