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2013-12-28 16:10:06
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Verilog 代码
下面代码功能主要是完成一个0-99s的计数器，动态刷新。主要是在LCD1602上动态显示：“Cnt：00”。 module lcd1602_driver(input clk, //50M input rst_n, output lcd_p, //Backlight Source + output lcd_n, //Backlight Source - output reg lcd_rs, //0:write order; 1:write data output lcd_rw, //0:write data; 1:read data output reg lcd_en, //negedge output reg [7:0] lcd_data); //--------------------lcd1602 order---------------------------- parameter Mode_Set = 8'h31, Cursor_Set = 8'h0c, Address_Set = 8'h06, Clear_Set = 8'h01; /****************************LCD1602 Display Data****************************/ wire [7:0] data0,data1; //counter data wire [7:0] addr; //write address //---------------------------------1s counter----------------------------------- reg [31:0] cnt1; reg [7:0] data_r0,data_r1; always@(posedge clk or negedge rst_n) begin if(!rst_n) begin cnt1 <= 1'b0; data_r0 <= 1'b0; data_r1 <= 1'b0; end else if(cnt1==32'd50000000) begin if(data_r0==8'd9) begin data_r0 <= 1'b0; if(data_r1==8'd9) data_r1 <= 1'b0; else data_r1 <= data_r1 + 1'b1; end else data_r0 <= data_r0 + 1'b1; cnt1 <= 1'b0; end else cnt1 <= cnt1 + 1'b1; end assign data0 = 8'h30 + data_r0 ; assign data1 = 8'h30 + data_r1 ; //-------------------address------------------ assign addr = 8'h80; /****************************LCD1602 Driver****************************/ //-----------------------lcd1602 clk_en--------------------- reg [31:0] cnt; reg lcd_clk_en; always @(posedge clk or negedge rst_n) begin if(!rst_n) begin cnt <= 1'b0; lcd_clk_en <= 1'b0; end else if(cnt == 32'h24999) //500us begin lcd_clk_en <= 1'b1; cnt <= 1'b0; end else begin cnt <= cnt + 1'b1; lcd_clk_en <= 1'b0; end end //-----------------------lcd1602 display state------------------------------------------- reg [4:0] state; always@(posedge clk or negedge rst_n) begin if(!rst_n) begin state <= 1'b0; lcd_rs <= 1'b0; lcd_en <= 1'b0; lcd_data <= 1'b0; end else if(lcd_clk_en) begin case(state) //-------------------init_state--------------------- 5'd0: begin lcd_rs <= 1'b0; lcd_en <= 1'b1; lcd_data <= Mode_Set; state <= state + 1'd1; end 5'd1: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd2: begin lcd_rs <= 1'b0; lcd_en <= 1'b1; lcd_data <= Cursor_Set; state <= state + 1'd1; end 5'd3: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd4: begin lcd_rs <= 1'b0; lcd_en <= 1'b1; lcd_data <= Address_Set; state <= state + 1'd1; end 5'd5: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd6: begin lcd_rs <= 1'b0; lcd_en <= 1'b1; lcd_data <= Clear_Set; state <= state + 1'd1; end 5'd7: begin lcd_en <= 1'b0; state <= state + 1'd1; end //--------------------work state-------------------- 5'd8: begin lcd_rs <= 1'b0; lcd_en <= 1'b1; lcd_data <= addr; //write addr state <= state + 1'd1; end 5'd9: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd10: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= "C"; //write data state <= state + 1'd1; end 5'd11: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd12: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= "n"; //write data state <= state + 1'd1; end 5'd13: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd14: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= "t"; //write data state <= state + 1'd1; end 5'd15: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd16: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= ":"; //write data state <= state + 1'd1; end 5'd17: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd18: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= data1; //write data: tens digit state <= state + 1'd1; end 5'd19: begin lcd_en <= 1'b0; state <= state + 1'd1; end 5'd20: begin lcd_rs <= 1'b1; lcd_en <= 1'b1; lcd_data <= data0; //write data: single digit state <= state + 1'd1; end 5'd21: begin lcd_en <= 1'b0; state <= 5'd8; end default: state <= 5'bxxxxx; endcase end end assign lcd_rw = 1'b0; //only write //------------------backlight driver---------------- assign lcd_n = 1'b0; assign lcd_p = 1'b1; endmodule 楼主可以看看这篇帖子：http://blog.chinaaet.com/detail/35557 |
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先来认真学习一下。。。。。
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应该注意两个方面就好了，一个是要显示的数据或者字符，另一个是刷新频率吧，希望可以对你有帮助
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