Verilog HDL汽车尾灯控制器的实现

Posted 2020-11-26 codaland

基于Verilog的汽车尾灯控制器的实现

首先进行模块的定义

模块具有三个输入：时钟，重置，和汽车状态、以及六个输出分别控制左右（l,r）三色LED的红绿蓝三个阴极

   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  
   );  

因为左右转向灯和双闪均为黄色，所以将左右两个三色LED的红、绿阴极统一安排给l_light、r_light两个变量控制
红+绿 <= 污黄

   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  

下面进行1Hz的分频

分频模块重新定义参数，分频系数为12M，将板载12MHz的晶振分为1Hz的时钟。

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

最后是逻辑部分的描述

汽车状态由拨码开关控制：
0001 —— 直行，不闪灯
0010 —— 左转，闪左灯
0100 —— 右转，闪右灯
1000 —— 故障，双闪
1111 —— 倒车，两灯白色常亮

   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