FPGA 1602动态显示办法
是不是在模块内设置一个变量啊，然后那个变量怎么变化，然后1602上面也变化。“电压值 = **.**”
电子科大的妹子还是哥哥啊?
额....哥
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
小编可以看看这篇帖子：http://blog.chinaaet.com/detail/35557
先来认真学习一下。
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