module vga( clk,rst_n, hsync,vsync, vga_r,vga_g,vga_b ); input clk; //50MHz input rst_n; //低电平复位 output hsync; //行同步信号 output vsync; //场同步信号 output vga_r; output vga_g; output vga_b; //-------------------------------------------------- reg[10:0] x_cnt; //行坐标 reg[9:0] y_cnt; //列坐标 always @ (posedge clk or negedge rst_n) if(!rst_n) x_cnt <= 11‘d0; else if(x_cnt == 11‘d1039) x_cnt <= 11‘d0; else x_cnt <= x_cnt+1‘b1; always @ (posedge clk or negedge rst_n) if(!rst_n) y_cnt <= 10‘d0; else if(y_cnt == 10‘d665) y_cnt <= 10‘d0; else if(x_cnt == 11‘d1039) y_cnt <= y_cnt+1‘b1; //-------------------------------------------------- wire valid; //有效显示区标志 assign valid = (x_cnt >= 11‘d187) && (x_cnt < 11‘d987) && (y_cnt >= 10‘d31) && (y_cnt < 10‘d631); wire[9:0] xpos,ypos; //有效显示区坐标 assign xpos = x_cnt-11‘d187; assign ypos = y_cnt-10‘d31; //-------------------------------------------------- reg hsync_r,vsync_r; //同步信号产生 always @ (posedge clk or negedge rst_n) if(!rst_n) hsync_r <= 1‘b1; else if(x_cnt == 11‘d0) hsync_r <= 1‘b0; //产生hsync信号 else if(x_cnt == 11‘d120) hsync_r <= 1‘b1; always @ (posedge clk or negedge rst_n) if(!rst_n) vsync_r <= 1‘b1; else if(y_cnt == 10‘d0) vsync_r <= 1‘b0; //产生vsync信号 else if(y_cnt == 10‘d6) vsync_r <= 1‘b1; assign hsync = hsync_r; assign vsync = vsync_r; //-------------------------------------------------- //显示一个矩形框 wire a_dis,b_dis,c_dis,d_dis; //矩形框显示区域定位 assign a_dis = ( (xpos>=200) && (xpos<=220) ) && ( (ypos>=140) && (ypos<=460) ); assign b_dis = ( (xpos>=580) && (xpos<=600) ) && ( (ypos>=140) && (ypos<=460) ); assign c_dis = ( (xpos>=220) && (xpos<=580) ) && ( (ypos>140) && (ypos<=160) ); assign d_dis = ( (xpos>=220) && (xpos<=580) ) && ( (ypos>=440) && (ypos<=460) ); //显示一个小矩形 wire e_rdy; //矩形的显示有效矩形区域 assign e_rdy = ( (xpos>=385) && (xpos<=415) ) && ( (ypos>=285) && (ypos<=315) ); //-------------------------------------------------- //r,g,b控制液晶屏颜色显示,背景显示蓝色,矩形框显示红蓝色 assign vga_r = valid ? e_rdy : 1‘b0; assign vga_g = valid ? (a_dis | b_dis | c_dis | d_dis) : 1‘b0; assign vga_b = valid ? ~(a_dis | b_dis | c_dis | d_dis) : 1‘b0; endmodule
时间: 2024-11-13 04:05:17