带液晶显示驱动的智能电梯控制器
&FLOOR6) NextState=DOWN; else if(up_all>0) begin if(((up_all&FLOOR1) NextState=DOWN; else if((up_all&pos)>0) NextState=OPENDOOR; else NextState=UP;// end else if(request_all||down_all) NextState=UP; else NextState=WAIT;// end //请参考WAIT模式的注释 else begin if(request_all>0) begin if((request_all&pos)>0) NextState=OPENDOOR; else if(request_all>pos) NextState=UP; else NextState=DOWN; end else if((up_all&pos)||(down_all&pos)) begin NextState=OPENDOOR; end else if((up_all>pos)||(down_all>pos)) NextState=UP; else if(up_all||down_all) NextState=DOWN; else begin NextState=WAIT; - 26 - 带液晶显示驱动的智能电梯控制器 end end end default: NextState=WAIT; endcase //3rd StateShift always block,the sequential FSM output，有限状态机第三段 always @(posedge real_clk or posedge reset)//output if(reset) //复位后初始化当前楼层为第一层,门是关闭的,电梯是静止的 begin pos<=FLOOR1; DoorFlag<=CLOSED; UpDnFlag<=STATIC; end else begin PosOut<=pos;//PosOut的输出慢pos一个时钟周期 case(NextState) WAIT: //状态为WAIT时,楼层不变,门是关闭的,电梯是静止的,其他模式的情况请大家自己推导 begin pos<=pos; DoorFlag<=CLOSED; UpDnFlag<=STATIC; end UP: begin pos<=pos<<1; DoorFlag<=CLOSED; UpDnFlag<=UPFLAG; end DOWN: begin pos<=pos>>1; DoorFlag<=CLOSED; UpDnFlag<=DNFLAG; end UPSTOP: - 27 - 带液晶显示驱动的智能电梯控制器 begin pos<=pos; DoorFlag<=CLOSED; UpDnFlag<=UPFLAG; end DOWNSTOP: begin pos<=pos; DoorFlag<=CLOSED; UpDnFlag<=DNFLAG; end OPENDOOR: begin pos<=pos; DoorFlag<=OPEN; UpDnFlag<=UpDnFlag; end CLOSEDOOR: begin pos<=pos; DoorFlag<=CLOSED; UpDnFlag<=UpDnFlag; end default: //默认情况 begin pos<=FLOOR1; DoorFlag<=CLOSED; UpDnFlag<=STATIC; end endcase end endmodule 5.3 数码管译码模块 module display_decode(cp_50M,in,out,over_alarm); input [5:0]in; input cp_50M; output [6:0]out; output over_alarm; reg [6:0]out; - 28 - 带液晶显示驱动的智能电梯控制器 reg over_alarm; always@(posedge cp_50M) begin case(in) 6'b000000:out<=7'b100_0000;//0 6'b000001:out<=7'b111_1001;//1 6'b000010:out<=7'b010_0100;//2 6'b000100:out<=7'b011_0000;//3 6'b001000:out<=7'b001_1001;//4 6'b010000:out<=7'b001_0010;//5 6'b100000:out<=7'b000_0010;//6 default:over_alarm<=1; endcase end endmodule 5.4 数码管时间译码模块 module display_decode_count(cp_50M,in,count_out); input [2:0]in; input cp_50M; output [6:0] count_out; reg [6:0] count_out; always@(posedge cp_50M) begin case(in) 3'b000:count_out<=7'b100_0000;//0 3'b001:count_out<=7'b111_1001;//1 3'b010:count_out<=7'b010_0100;//2 3'b011:count_out<=7'b011_0000;//3 3'b100:count_out<=7'b001_1001;//4 3'b101:count_out<=7'b001_0010;//5 3'b110:count_out<=7'b000_0010;//6 default: ; endcase end endmodule note:由于以上两个模块都比较的简单，故不作详细的注释，而且我在前面也提到了设计思想，应该不是很难理解。 - 29 - 带液晶显示驱动的智能电梯控制器 5.5 LCD仲裁器 module arbitrator(elevator_state,count_in,open_enable,stop_enable,up_enable,down_enable,close_enable); input [6:0]elevator_state;//电梯状态 input [2:0]count_in;//计数器输出 output open_enable,stop_enable,up_enable,down_enable,close_enable;//输出LCD驱动命令信号 assign open_enable=(count_in!=0);//当这在计数时，电梯应该是开门的 assign close_enable=(elevator_state==7'b1000000);//电梯关门 assign stop_enable=((elevator_state==7'b0000001)||(elevator_state==7'b0001000)||(elevator_state==7'b0010000));//只要满足一种情况电梯都应是处于停止等待状态 assign up_enable=(elevator_state==7'b0000010); //上升 assign down_enable=(elevator_state==7'b0000100);//下降 endmodule 5.6 LCD驱动模块 module DE2_Default ( //////////////////// Clock Input //////////////////// open_enable,stop_enable,up_enable,down_enable,close_enable, CLOCK_50, // 50 MHz KEY, //////////////////// LCD Module 16X2 //////////////// LCD_ON, // LCD Power ON/OFF LCD_BLON, // LCD Back Light ON/OFF LCD_RW, // LCD Read/Write Select, 0 = Write, 1 = Read LCD_EN, // LCD Enable LCD_RS, // LCD Command/Data Select, 0 = Command, 1 = Data LCD_DATA // LCD Data bus 8 bits - 30 -