16位乘法器学习笔记(Verilog语言源程序+仿真程序)
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LCD1602显示源程序如下：
module lcd1602(input clk, //60M
input rst_n,
output lcd_p, //Backlight Source + lcd屏幕背光
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 在lcd_en下降沿需保证数据有效
output reg [7:0] lcd_data);
mux16
mul(.rst_n(rst_n),.clk(clk),.start(start),.ain(data0),.bin(data1),.yout(data2),.done(done));//端口名称关联
//--------------------lcd1602 order----------------------------
parameter Mode_Set = 8'h31, //功能设置，
Cursor_Set = 8'h0c, //光标设置
Address_Set = 8'h06, //输入模式设置
Clear_Set = 8'h01; //清屏设置
/****************************LCD1602 Display Data****************************/ wire [7:0] data_r0,data_r1,data_r2; //乘数、被乘数
wire [15:0]data0,data1; //结果显示
wire [31:0]data2;
wire [7:0] addr; //write address
wire start,done;
assign data_r0 = 8'h30 + data0[7:0] ; // 8'h30在LCD1602上显示值为0。
assign data_r1 = 8'h30 + data1[7:0] ;
assign data_r2 = 8'h30 + data2[7:0];
//-------------------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) //600us
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 [6:0] 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---------------------
6'd0: begin
lcd_rs <= 1'b0;
lcd_en <= 1'b1;
lcd_data <= Mode_Set; //进入功能设置模式，“31”：数据总线8位，显示一行。6*7点阵/每字符
state <= state + 1'd1;
end
6'd1: begin
lcd_en <= 1'b0; //lcd_en变低电平，使led_en出现下降沿
state <= state + 1'd1;
end
6'd2: begin
lcd_rs <= 1'b0;
lcd_en <= 1'b1;
lcd_data <= Cursor_Set;//光标设置：光标右移一格，且AC值加1.
state <= state + 1'd1;
end
6'd3: begin
lcd_en <= 1'b0;
state <= state + 1'd1;
end
6'd4: begin
lcd_rs <= 1'b0;
lcd_en <= 1'b1;
lcd_data <= Address_Set;//模式设置：写入新数据后光标右移，AC自增1
state <= state + 1'd1;
end
6'd5: begin
lcd_en <= 1'b0;
state <= state + 1'd1;
end
6'd6: begin
lcd_rs <= 1'b0;
lcd_en <= 1'b1;
lcd_data <= Clear_Set;//清屏操作：0x01
state <= state + 1'd1;
end
6'd7: begin
lcd_en <= 1'b0;
state <= state + 1'd1;
end
//--------------------work state--------------------
6'd8: begin
lcd_rs <= 1'b0;
lcd_en <= 1'b1;
lcd_data <= addr; //write addr
state <= state + 1'd1;
end
6'd9: begin
lcd_en <= 1'b0;
state <= state + 1'd1;
end
6'd10: begin
lcd_rs <= 1'b1;
lcd_en <= 1'b1;
lcd_data <= "R"; //write data
state <= state + 1'd1;