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节后上班比较忙，焊接进度比较慢，焊接中遇到的问题：
1 钽电容方向要注意；
2 核心芯片焊接经历多次才成功，第一次自己焊接电源部分1.2V输出不正常，一直是1.2V与GND导通，查了很长时间没找出原因。最后是硬件工程师帮忙，将主芯片吹下后重新焊接就好了。
3 焊接时注意器件的高低顺序，以免增加焊接时的不便。
4 元器件中无220的电阻，直接用200替换。
5 请下载最新的BOM表，元器件给的会有点多（电阻、电容），焊接完成的器件做好标识。
 

FPGFA_DIY教程_LED篇课后作业  
（1）跑马灯（左向）
          视频已拍，还不会上传，先传代码。

代码如下：
module led1(clk,rst,led);
 input clk;
 input rst;
 output led;
reg[10:0] led;
reg[31:0] count;

always@(posedge clk or negedge rst)
 begin
     if(!rst)
          count<=32'd0;
     else
         begin
             if(count==32'd9999999)
                  count<=32'd0;
            else
                  count<=count+1'b1;
        end
 end
 
always@(posedge clk or negedge rst)
 begin
     if(!rst)
          led<=11'b01111111111;
     else
         begin
             if(count==32'd9999999)
                  led<={led[0],led[10:1]};    //循环左移1位  左移两位为led<={led[1:0],led[10:2]};    
            else
                led<=led;
        end
 end 
 
endmodule

LED作业2.  case 语句实现。
代码如下：
module led1(clk,rst,led);
     input clk;
     input rst;
     output led;
reg [10:0] led;
reg [31:0] count;
reg [5:0] state;

always @(posedge clk or negedge rst)
 begin
      if(!rst)
          begin
               count<=32'd0;
               state<=5'd0;
       end
   else
         begin
              if(count==32'd29999999)
                      begin
                           count<=32'd0;
                           if(state==5'd30)
                                  begin
                                          state<=5'd0;
                                  end
                           else
                                  state<=state+1'b1;
                       end
                 else
                        count<=count+1'b1;
         end
 end

 
always @ (state)
      begin
            case(state)
               5'd1: led<=11'b00000100000;
               5'd2: led<=11'b00001110000;
               5'd3: led<=11'b00011111000;
               5'd4: led<=11'b00111111100;
               5'd5: led<=11'b01111111110;
               5'd6: led<=11'b11111111111;
               5'd7: led<=11'b00000000000;
               5'd8: led<=11'b10000000000;
               5'd9: led<=11'b11000000000;
               5'd10: led<=11'b11100000000;
               5'd11: led<=11'b11110000000;
               5'd12: led<=11'b11111000000;
               5'd13: led<=11'b11111100000;
               5'd14: led<=11'b11111110000;
               5'd15: led<=11'b11111111000;
               5'd16: led<=11'b11111111100;
                5'd17: led<=11'b11111111110;
                5'd18: led<=11'b11111111111;
               5'd19: led<=11'b11111111110;
               5'd20: led<=11'b11111111100;
               5'd21: led<=11'b11111111000;
               5'd22: led<=11'b11111110000;
              5'd23: led<=11'b11111100000;
              5'd24: led<=11'b11111000000;
             5'd25: led<=11'b11110000000;
             5'd26: led<=11'b11100000000;
              5'd27: led<=11'b11000000000;
             5'd28: led<=11'b10000000000;
            5'd29: led<=11'b00000000000;
            default: led<=11'b11111111111;   
         endcase
 end
endmodule