代码部分:
/*
分辨率:600*480
功能:每隔3s变化一次,a~e循环变换
a.全红
b.全白
c.2*2 4部分,分别是:红,蓝,绿,黄
d.3*3 9部分,分别是:红黄蓝绿黑紫白青粉
e.150*100矩形边框,边缘是20宽度的绿色框,其他为白色
*/
module VGA_test4(clk,rst_n,lcd_data,lcd_hs,lcd_vs);
input clk; //25mhz
input rst_n;
output lcd_vs;//场同步信号
output lcd_hs;//行同步信号
output [7:0]lcd_data;
parameter LCD_HS_CNT = 799,
LCD_VS_CNT = 524;
reg [9:0] lcd_hs_cnt;//行同步计数
always@(posedge clk or negedge rst_n)
if(!rst_n)
lcd_hs_cnt <= 10'd0;
else if(lcd_hs_cnt==LCD_HS_CNT)
lcd_hs_cnt <= 10'd0;
else
lcd_hs_cnt <= lcd_hs_cnt + 1'b1;
reg lcd_hs;
always@(posedge clk or negedge rst_n)
if(!rst_n)
lcd_hs <= 1'b0;
else if(lcd_hs_cnt<96)
lcd_hs <= 1'b0;
else
lcd_hs <= 1'b1;
reg [9:0] lcd_vs_cnt;//场同步计数
always@(posedge clk or negedge rst_n)
if(!rst_n)
lcd_vs_cnt <= 10'd0;
else if(lcd_hs_cnt==LCD_HS_CNT && lcd_vs_cnt==LCD_VS_CNT)
lcd_vs_cnt <= 10'd0;
else if(lcd_hs_cnt==LCD_HS_CNT)
lcd_vs_cnt <= lcd_vs_cnt + 1'b1;
else if(lcd_vs_cnt==LCD_VS_CNT)
lcd_vs_cnt <= lcd_vs_cnt;
reg lcd_vs;
always@(posedge clk or negedge rst_n)
if(!rst_n)
lcd_vs <= 1'b0;
else if(lcd_vs_cnt<2)
lcd_vs <= 1'b0;
else
lcd_vs <= 1'b1;
reg [24:0]time_1s; //1s计数器
always@(posedge clk or negedge rst_n)
if(!rst_n)
time_1s <= 25'd0;
else if(time_1s == 24_999_999)
time_1s <= 25'd0;
else
time_1s <= time_1s + 1'b1;
reg [3:0]time_1s_cnt; //计数1s的个数
always @(posedge clk or negedge rst_n)
if(!rst_n)
time_1s_cnt <= 4'd0;
else if(time_1s_cnt==14)
time_1s_cnt <= 4'd0;
else if(time_1s==24_999_999)
time_1s_cnt <= time_1s_cnt + 1'b1;
else
time_1s_cnt <= time_1s_cnt;
reg [9:0]valid_area; //画出矩形,长为:787-141=646,宽为:516-32=484
always@(*)begin
valid_area = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 787) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 516));
end
//c:2*2 4部分,将646*484分成4部分
reg [9:0]valid_area_c1; //画出矩形,长为:464-141=323,宽为:274-32=242
always@(*)begin
valid_area_c1 = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 464) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 274));
end
reg [9:0]valid_area_c2; //画出矩形,长为:787-464=323,宽为:274-32=242
always@(*)begin
valid_area_c2 = ((lcd_hs_cnt >=464) && (lcd_hs_cnt <= 787) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 274));
end
reg [9:0]valid_area_c3; //画出矩形,长为:464-141=323,宽为:516-274=242
always@(*)begin
valid_area_c3 = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 464) && (lcd_vs_cnt >= 274) && (lcd_vs_cnt <= 516));
end
//d:3*3 9部分,将646*484分成9部分
reg [9:0]valid_area_d1; //画出矩形,长为:356-141=215,宽为:193-32=161
always@(*)begin
valid_area_d1 = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 356) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 193));
end
reg [9:0]valid_area_d2; //画出矩形,长为:571-356=215,宽为:354-193=161
always@(*)begin
valid_area_d2 = ((lcd_hs_cnt >=356) && (lcd_hs_cnt <= 571) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 193));
end
reg [9:0]valid_area_d3; //画出矩形,长为:787-571=216,宽为:516-354=162
always@(*)begin
valid_area_d3 = ((lcd_hs_cnt >=571) && (lcd_hs_cnt <= 787) && (lcd_vs_cnt >= 32) && (lcd_vs_cnt <= 193));
end
reg [9:0]valid_area_d4; //画出矩形,长为:356-141=215,宽为:193-32=161
always@(*)begin
valid_area_d4 = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 356) && (lcd_vs_cnt >= 193) && (lcd_vs_cnt <= 354));
end
reg [9:0]valid_area_d5; //画出矩形,长为:571-356=215,宽为:354-193=161
always@(*)begin
valid_area_d5 = ((lcd_hs_cnt >=356) && (lcd_hs_cnt <= 571) && (lcd_vs_cnt >= 193) && (lcd_vs_cnt <= 354));
end
reg [9:0]valid_area_d6; //画出矩形,长为:787-571=216,宽为:516-354=162
always@(*)begin
valid_area_d6 = ((lcd_hs_cnt >=571) && (lcd_hs_cnt <= 787) && (lcd_vs_cnt >= 193) && (lcd_vs_cnt <= 354));
end
reg [9:0]valid_area_d7; //画出矩形,长为:356-141=215,宽为:193-32=161
always@(*)begin
valid_area_d7 = ((lcd_hs_cnt >=141) && (lcd_hs_cnt <= 356) && (lcd_vs_cnt >= 354) && (lcd_vs_cnt <= 516));
end
reg [9:0]valid_area_d8; //画出矩形,长为:571-356=215,宽为:354-193=161
always@(*)begin
valid_area_d8 = ((lcd_hs_cnt >=356) && (lcd_hs_cnt <= 571) && (lcd_vs_cnt >= 354) && (lcd_vs_cnt <= 516));
end
//e:150*100边框
reg [9:0]valid_area_e;
always@(*)begin
valid_area_e = ((lcd_hs_cnt >=389) && (lcd_hs_cnt <= 539) && (lcd_vs_cnt >= 224) && (lcd_vs_cnt <= 324));
end
reg [9:0]valid_area_e1;
always@(*)begin
valid_area_e1 = (((lcd_hs_cnt >= 389) && (lcd_hs_cnt <= 409)) |
((lcd_hs_cnt >= 519) && (lcd_hs_cnt <= 539)) |
((lcd_vs_cnt >= 224) && (lcd_vs_cnt <= 244)) |
((lcd_vs_cnt >= 304) && (lcd_vs_cnt <= 324)));
end
reg [7:0]lcd_data;
always@(posedge clk or negedge rst_n)
if(!rst_n)
lcd_data <= 8'h0;
else if(valid_area)begin
if(time_1s_cnt>=0 && time_1s_cnt<=2) //a
lcd_data <= 8'b111_000_00; //全红
else if(time_1s_cnt>=3 && time_1s_cnt<=5) //b
lcd_data <= 8'b111_111_11; //全白
else if(time_1s_cnt>=6 && time_1s_cnt<=8) //c
if(valid_area_c1)
lcd_data <=8'b111_000_00; //红
else if(valid_area_c2)
lcd_data <=8'b000_000_11; //蓝
else if(valid_area_c3)
lcd_data <=8'b000_111_00; //绿
else
lcd_data <=8'b111_111_00; //黄
else if(time_1s_cnt>=9 && time_1s_cnt<=11) //d
if(valid_area_d1)
lcd_data <=8'b111_000_00;//红
else if(valid_area_d2)
lcd_data <=8'b111_111_00;//黄
else if(valid_area_d3)
lcd_data <=8'b000_000_11;//蓝
else if(valid_area_d4)
lcd_data <=8'b000_111_00;//绿
else if(valid_area_d5)
lcd_data <=8'b000_000_00;//黑
else if(valid_area_d6)
lcd_data <=8'b111_000_11;//紫
else if(valid_area_d7)
lcd_data <=8'b111_111_11;//白
else if(valid_area_d8)
lcd_data <=8'b000_111_11;//青
else
lcd_data <=8'b000_111_10;//粉(不知)
else if(time_1s_cnt>=12 && time_1s_cnt<=14) //e
if(valid_area_e)
if(valid_area_e1)
lcd_data <=8'b000_111_00;//绿
else
lcd_data <=8'b111_111_11;//白
else
lcd_data <=8'b111_111_11;//白
end
else
lcd_data <= 8'h0; //black
endmodule
ps:行边沿从141开始,场边沿从32开始,使得图像在显示屏的中心显示。
在电脑显示屏上的显示结果如下:
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