: : 特权 franchises3 `timescale 1ns / 1ps //////////////////////////////////////////////////////////////////////////////// // Company // Engineer // Create Date : 2009.05.27 // Design Name // Module Name // Project Name // Target Device: Cyclone EP1C3T144C8 // Tool versions: Quartus II 8.1 // Description : 连接 SF-EP1C6 开发板的 VGA 接口和电脑液晶屏， // // Revision : V1.0 // Additional Comments : // //////////////////////////////////////////////////////////////////////////////// module vga_char( : vga_char : vga_char : vga_char 显示字符"EDN" clk_25m,rst_n,//系统控制 hsync,vsync,vga_r,vga_g,vga_b // VGA 控制 ); input clk_25m; input rst_n; // 25MHz //低电平复位 // FPGA 与 VGA 接口信号 //行同步信号 //场同步信号 output hsync; output vsync; output[2:0] vga_r; output[2:0] vga_g; output[1:0] vga_b; //-------------------------------------------------- // 坐标计数 reg[9:0] x_cnt; reg[9:0] y_cnt; //行坐标 //列坐标 always @ (posedge clk_25m or negedge rst_n) if(!rst_n) x_cnt <= 10'd0; else if(x_cnt == 10'd799) x_cnt <= 10'd0; else x_cnt <= x_cnt+1'b1; always @ (posedge clk_25m or negedge rst_n) if(!rst_n) y_cnt <= 10'd0; else if(y_cnt == 10'd599) y_cnt <= 10'd0; 

else if(x_cnt == 10'd799) y_cnt <= y_cnt+1'b1; //产生 hsync 信号 //产生 vsync 信号 //-------------------------------------------------- // VGA 场同步,行同步信号 reg hsync_r,vsync_r; //同步信号 always @ (posedge clk_25m or negedge rst_n) if(!rst_n) hsync_r <= 1'b1; else if(x_cnt == 10'd0) hsync_r <= 1'b0; else if(x_cnt == 10'd96) hsync_r <= 1'b1; always @ (posedge clk_25m or negedge rst_n) if(!rst_n) vsync_r <= 1'b1; else if(y_cnt == 10'd0) vsync_r <= 1'b0; else if(y_cnt == 10'd2) vsync_r <= 1'b1; assign hsync = hsync_r; assign vsync = vsync_r; //-------------------------------------------------- //有效显示标志位产生 reg valid_yr; always @ (posedge clk_25m or negedge rst_n) //行显示有效信号 if(!rst_n) valid_yr <= 1'b0; else if(y_cnt == 10'd32) valid_yr <= 1'b1; else if(y_cnt == 10'd512) valid_yr <= 1'b0; wire valid_y = valid_yr; reg valid_r; always @ (posedge clk_25m or negedge rst_n) // VGA 有效显示区标志位 if(!rst_n) valid_r <= 1'b0; else if((x_cnt == 10'd141) && valid_y) valid_r <= 1'b1; else if((x_cnt == 10'd781) && valid_y) valid_r <= 1'b0; wire valid = valid_r; wire[9:0] x_dis; wire[9:0] y_dis; //横坐标显示有效区域相对坐标值 0-639 //竖坐标显示有效区域相对坐标值 0-479 assign x_dis = x_cnt - 10'd142; assign y_dis = y_cnt - 10'd33; //-------------------------------------------------- 

//-------------------------------------------------- // VGA 色彩信号产生 /* RGB = 000 黑色 = 001 蓝色 = 010 绿色 = 011 青色 */ RGB = 100 红色 = 101 紫色 = 110 黄色 = 111 白色 /*EDN 字模参数*/ parameter char_line0 = 64'h0100000000000040, char_line1 = 64'h01007FF821F02040, char_line2 = 64'h0100001011101040, char_line3 = 64'h3FF8002011101040, char_line4 = 64'h2108004001100040, char_line5 = 64'h21080180020E0040, char_line6 = 64'h21080100F400F7FE, char_line7 = 64'h3FF8FFFE13F81040, char_line8 = 64'h2108010011081040, char_line9 = 64'h2108010011101040, char_linea = 64'h2108010010901040, char_lineb = 64'h3FF8010014A01040, char_linec = 64'h210A010018401440, char_lined = 64'h0102010010A01840, char_linee = 64'h0102050003181040, char_linef = 64'h00FE02000C060040; reg[6:0] char_bit; //显示位计算 always @(posedge clk_25m or negedge rst_n) if(!rst_n) char_bit <= 5'h1f; else if(x_cnt == 10'd400) char_bit <= 7'd63; //显示最高位数据 else if(x_cnt > 10'd400 && x_cnt < 10'd529) char_bit <= char_bit-1'b1; // 依 次 显 示 后 面 的数据 reg[7:0] vga_rgb; // VGA 色彩显示寄存器 always @ (posedge clk_25m) if(!valid) vga_rgb <= 8'd0; else if(x_cnt > 10'd400 && x_cnt < 10'd529) begin case(y_dis) 10'd231: if(char_line0[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_11100; //绿色 10'd232: if(char_line1[char_bit]) vga_rgb <= 8'b111_000_01; //红色 

else vga_rgb <= 8'b001_111_00; //绿色 10'd233: if(char_line2[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd234: if(char_line3[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd235: if(char_line4[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd236: if(char_line5[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd237: if(char_line6[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd238: if(char_line7[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd239: if(char_line8[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd240: if(char_line9[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd241: if(char_linea[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd242: if(char_lineb[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd243: if(char_linec[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd244: if(char_lined[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd245: if(char_linee[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 10'd246: if(char_linef[char_bit]) vga_rgb <= 8'b111_000_01; //红色 else vga_rgb <= 8'b001_111_00; //绿色 default: vga_rgb <= 8'h03; endcase end vga_rgb <= 8'h1C; else if (x_cnt > 10'd0 && x_cnt < 10'd101) else if(x_cnt > 10'd100 && x_cnt < 10'd201) vga_rgb <= 8'hE0; else if(x_cnt > 10'd200 && x_cnt < 10'd301) vga_rgb <= 8'h03; else if(x_cnt > 10'd300 && x_cnt < 10'd401) vga_rgb <= 8'h1C; else if(x_cnt > 10'd528 && x_cnt < 10'd628) vga_rgb <= 8'h1C; else if(x_cnt > 10'd627 && x_cnt < 10'd728) vga_rgb <= 8'hAB; else if(x_cnt > 10'd727 && x_cnt < 10'd782) vga_rgb <= 8'hE0; 

//r,g,b 控制液晶屏颜色显 assign vga_r = vga_rgb[7:5]; assign vga_g = vga_rgb[4:2]; assign vga_b = vga_rgb[1:0]; endmodule