| 新近写的，水平有限，欢迎拍砖。 实验程序： --------------------------------------------------- module lcd1602_drive( input clk, input rst_n, // LCD1602 Interface output reg [7:0] lcd_data, output lcd_e, output reg lcd_rs, output lcd_rw ); // +++++++++++++++++++++++++++++++++++++ // 分频模块开始 // +++++++++++++++++++++++++++++++++++++ parameter CLK_DIV = 10_0000; // 分频参数 reg [16:0] cnt; // 分频计数子 reg lcd_clk; // 500Hz // 将50MHz板载时钟分频至500Hz // 注：计数分频，非等占空比 always @(posedge clk, negedge rst_n) begin if(!rst_n) begin cnt <= 1'b0; lcd_clk <= 0; end else begin if(cnt <= CLK_DIV) begin cnt <= cnt + 1'b1; lcd_clk <= 1; end else begin cnt <= 1'b0; lcd_clk <= 0; end end end // ------------------------------------- // 分频模块结束 // ------------------------------------- // +++++++++++++++++++++++++++++++++++++ // LCD1602驱动模块开始 // +++++++++++++++++++++++++++++++++++++ /* * 格雷码编码 * 状态数：初始化5个；换行1个；数据32个；空闲1个；共39个。 */ // 初始化 parameter INIT_0 = 8'h00; parameter INIT_1 = 8'h01; parameter INIT_2 = 8'h03; parameter INIT_3 = 8'h02; parameter INIT_4 = 8'h06; // 显示第一行 parameter ROW1_0 = 8'h07; parameter ROW1_1 = 8'h05; parameter ROW1_2 = 8'h04; parameter ROW1_3 = 8'h0C; parameter ROW1_4 = 8'h0D; parameter ROW1_5 = 8'h0F; parameter ROW1_6 = 8'h0E; parameter ROW1_7 = 8'h0A; parameter ROW1_8 = 8'h0B; parameter ROW1_9 = 8'h09; parameter ROW1_A = 8'h08; parameter ROW1_B = 8'h18; parameter ROW1_C = 8'h19; parameter ROW1_D = 8'h1B; parameter ROW1_E = 8'h1A; parameter ROW1_F = 8'h1E; // 换行 parameter CH_ROW = 8'h1F; // 显示第二行 parameter ROW2_0 = 8'h1D; parameter ROW2_1 = 8'h1C; parameter ROW2_2 = 8'h14; parameter ROW2_3 = 8'h15; parameter ROW2_4 = 8'h17; parameter ROW2_5 = 8'h16; parameter ROW2_6 = 8'h12; parameter ROW2_7 = 8'h13; parameter ROW2_8 = 8'h11; parameter ROW2_9 = 8'h10; parameter ROW2_A = 8'h30; parameter ROW2_B = 8'h31; parameter ROW2_C = 8'h33; parameter ROW2_D = 8'h32; parameter ROW2_E = 8'h36; parameter ROW2_F = 8'h37; // 空闲 parameter IDLE = 8'h35; reg [5:0] current_state, next_state; // 现态、次态 // FSM: always1 always @ (posedge lcd_clk, negedge rst_n) if(!rst_n) current_state <= INIT_0; else current_state <= next_state; // FSM: always2 always begin case(current_state) // 初始化 INIT_0 : next_state = INIT_1; INIT_1 : next_state = INIT_2; INIT_2 : next_state = INIT_3; INIT_3 : next_state = INIT_4; INIT_4 : next_state = ROW1_0; // 显示第一行 ROW1_0 : next_state = ROW1_1; ROW1_1 : next_state = ROW1_2; ROW1_2 : next_state = ROW1_3; ROW1_3 : next_state = ROW1_4; ROW1_4 : next_state = ROW1_5; ROW1_5 : next_state = ROW1_6; ROW1_6 : next_state = ROW1_7; ROW1_7 : next_state = ROW1_8; ROW1_8 : next_state = ROW1_9; ROW1_9 : next_state = ROW1_A; ROW1_A : next_state = ROW1_B; ROW1_B : next_state = ROW1_C; ROW1_C : next_state = ROW1_D; ROW1_D : next_state = ROW1_E; ROW1_E : next_state = ROW1_F; ROW1_F : next_state = CH_ROW; // 换行 CH_ROW : next_state = ROW2_0; // 显示第二行 ROW2_0 : next_state = ROW2_1; ROW2_1 : next_state = ROW2_2; ROW2_2 : next_state = ROW2_3; ROW2_3 : next_state = ROW2_4; ROW2_4 : next_state = ROW2_5; ROW2_5 : next_state = ROW2_6; ROW2_6 : next_state = ROW2_7; ROW2_7 : next_state = ROW2_8; ROW2_8 : next_state = ROW2_9; ROW2_9 : next_state = ROW2_A; ROW2_A : next_state = ROW2_B; ROW2_B : next_state = ROW2_C; ROW2_C : next_state = ROW2_D; ROW2_D : next_state = ROW2_E; ROW2_E : next_state = ROW2_F; ROW2_F : next_state = IDLE; // 空闲 IDLE : next_state = IDLE; default : next_state = INIT_0; endcase end // FSM: always3 always @ (posedge lcd_clk, negedge rst_n) begin if(!rst_n) begin lcd_rs <= 0; lcd_data <= 8'h00; end else begin case(current_state) INIT_0, CH_ROW, IDLE: lcd_rs <= 0;// 开始写指令 ROW1_0, ROW2_0 : lcd_rs <= 1;// 开始写数据 endcase case(current_state) // 写指令，初始化 INIT_0 : lcd_data <= 8'h38; INIT_1 : lcd_data <= 8'h0C; INIT_2 : lcd_data <= 8'h01; INIT_3 : lcd_data <= 8'h06; INIT_4 : lcd_data <= 8'H80; // 写数据，显示第一行 ROW1_0 : lcd_data <= "a"; ROW1_1 : lcd_data <= "b"; ROW1_2 : lcd_data <= "c"; ROW1_3 : lcd_data <= "d"; ROW1_4 : lcd_data <= "e"; ROW1_5 : lcd_data <= "f"; ROW1_6 : lcd_data <= "g"; ROW1_7 : lcd_data <= "h"; ROW1_8 : lcd_data <= "i"; ROW1_9 : lcd_data <= "j"; ROW1_A : lcd_data <= "k"; ROW1_B : lcd_data <= "l"; ROW1_C : lcd_data <= "m"; ROW1_D : lcd_data <= "n"; ROW1_E : lcd_data <= "o"; ROW1_F : lcd_data <= "p"; // 写指令，换行 CH_ROW : lcd_data <= 8'hC0; // 写数据，显示第二行 ROW2_0 : lcd_data <= "A"; ROW2_1 : lcd_data <= "B"; ROW2_2 : lcd_data <= "C"; ROW2_3 : lcd_data <= "D"; ROW2_4 : lcd_data <= "E"; ROW2_5 : lcd_data <= "F"; ROW2_6 : lcd_data <= "G"; ROW2_7 : lcd_data <= "H"; ROW2_8 : lcd_data <= "I"; ROW2_9 : lcd_data <= "J"; ROW2_A : lcd_data <= "K"; ROW2_B : lcd_data <= "L"; ROW2_C : lcd_data <= "M"; ROW2_D : lcd_data <= "N"; ROW2_E : lcd_data <= "O"; ROW2_F : lcd_data <= "P"; // 写指令，空闲 IDLE : lcd_data <= 8'h00; endcase end end // 在时钟高电平有效，低电平失效 // 数据方可被锁存 assign lcd_e = lcd_clk; assign lcd_rw = 1'b0; // 只写 // ------------------------------------- // LCD1602驱动模块结束 // ------------------------------------- endmodule --------------------------------------------------- 实验现象：  (原文件名:抓图-1.png) Quartus II 综合报告：  (原文件名:抓图-2.png) |
改进版测试文件
module lcd1602_test(
input CLOCK_50, // 板载时钟50MHz
input Q_KEY, // 板载按键RST
// LCD1602 Interface
output [7:0] LCD1602_DATA, // LCD1602数据总线
output LCD1602_E, // LCD1602使能
output LCD1602_RS, // LCD1602指令数据选择
output LCD1602_RW // LCD1602读写选择
);
// 0 ~ (8*16-1) = 128
// 16bits -> 0123456789ABCDEF <-
wire [127:0] row1_val = "A Lcd Disp Test ";
wire [127:0] row2_val = "Amy-studio Pub ";
// 例化LCD1602驱动
lcd1602_drive u0(
.clk(CLOCK_50),
.rst_n(Q_KEY),
// LCD1602 Input Value
.row1_val(row1_val),
.row2_val(row2_val),
// LCD1602 Interface
.lcd_data(LCD1602_DATA),
.lcd_e(LCD1602_E),
.lcd_rs(LCD1602_RS),
.lcd_rw(LCD1602_RW)
);
endmodule
完整代码（不晓得什么意思，ourdev一次能贴的代码太短）点击此处下载 ourdev_534318.zip(文件大小:125K) (原文件名:_10_lcd1602_test.zip)
module lcd1602_test(
input CLOCK_50, // 板载时钟50MHz
input Q_KEY, // 板载按键RST
// LCD1602 Interface
output [7:0] LCD1602_DATA, // LCD1602数据总线
output LCD1602_E, // LCD1602使能
output LCD1602_RS, // LCD1602指令数据选择
output LCD1602_RW // LCD1602读写选择
);
// 0 ~ (8*16-1) = 128
// 16bits -> 0123456789ABCDEF <-
wire [127:0] row1_val = "A Lcd Disp Test ";
wire [127:0] row2_val = "Amy-studio Pub ";
// 例化LCD1602驱动
lcd1602_drive u0(
.clk(CLOCK_50),
.rst_n(Q_KEY),
// LCD1602 Input Value
.row1_val(row1_val),
.row2_val(row2_val),
// LCD1602 Interface
.lcd_data(LCD1602_DATA),
.lcd_e(LCD1602_E),
.lcd_rs(LCD1602_RS),
.lcd_rw(LCD1602_RW)
);
endmodule
完整代码（不晓得什么意思，ourdev一次能贴的代码太短）点击此处下载 ourdev_534318.zip(文件大小:125K) (原文件名:_10_lcd1602_test.zip)