[] Verilog HDL realize taillights Controller

Verilog taillights achieve controller-based

First, the definition module

Module has three inputs: RGB three clock, reset, and the state of cars, and six outputs respectively control the right and left (l, r) of the three-color LED cathode

   module       car_rear_light  
   (      input    clk,  
          input    rst,  
          input    [   3   :   0   ]car_status,  
          output       reg   [   0   :   0   ]l_light_r,          //左侧红灯  
          output       reg   [   0   :   0   ]r_light_r,          //右侧红灯  
          output       reg   [   0   :   0   ]l_light_g,          //左侧绿灯  
          output       reg   [   0   :   0   ]r_light_g,          //右侧绿灯   
          output       reg   [   0   :   0   ]l_light_b,          //左侧蓝灯  
          output       reg   [   0   :   0   ]r_light_b           //右侧蓝灯  
   );  

Because the left and right turn signals are double flash and yellow , so that the left and right two three-color LED of red, green cathode to the unified arrangement l_light, r_light two control variables
Red + Green <= dirty yellow

   reg   [   0   :   0   ]l_light;  
   reg   [   0   :   0   ]r_light;  

   always   @(   posedge    clk)  
   begin  
       l_light_r    =    l_light;  
       l_light_g    =    l_light;  
       r_light_r    =    r_light;  
       r_light_g    =    r_light;  
   end  

Dividing below 1Hz

Redefining the parameters frequency module, frequency division factor 12M, onboard 12MHz crystal clock divided 1Hz.

   wire    clk_1Hz;  
   
   divide     #(.WIDTH(   32   ),.N(   12_000_000   ))     u1    (         //分频12MHz到1Hz  
       .clk    (clk),  
       .rst_n  (rst),  
       .clkout (clk_1Hz)     
   );  

Finally, a description of the logical section

Condition of the car by the DIP switch control:
0001 - straight, no flash
0010 - left, the left flashing lamp
0100-- turn right, the right flash lamp
1000-- fault, double flash
1111-- reversing, two ordinary white lights bright

   always   @(   posedge    clk_1Hz)  
   begin  
          case   (car_status)  
              4'b0001   :                                   //直行  
              begin  
               l_light    <=       1   ;  
               r_light    <=       1   ;  
               l_light_b    <=       1   ;  
               r_light_b    <=       1   ;  
              end  
              4'b0010   :                                   //左转  
              begin  
               l_light    <=       ~   l_light;  
               r_light    <=       1   ;  
               l_light_b    <=       1   ;  
               r_light_b    <=       1   ;  
              end  
              4'b0100   :                                   //右转  
              begin  
               l_light    <=       1   ;  
               r_light    <=       ~   r_light;  
               l_light_b    <=       1   ;  
               r_light_b    <=       1   ;  
              end  
              4'b1000   :                                   //双闪  
              begin  
               l_light    <=       ~   l_light;  
               r_light    <=       ~   r_light;  
               l_light_b    <=       1   ;  
               r_light_b    <=       1   ;  
              end  
                4'b1111   :                                 //倒车  
                begin  
               l_light    <=       0   ;  
               r_light    <=       0   ;  
               l_light_b    <=       0   ;  
               r_light_b    <=       0   ;  
                end  
              default   :  
              begin  
               l_light    <=       1   ;  
               r_light    <=       1   ;  
               l_light_b    <=       1   ;  
               r_light_b    <=       1   ;  
                     
              end  
          endcase  
   end