HDMI信号横彩条，竖彩条，棋盘格的方法
//*************************************************************************\
//==========================================================================
// Description:
// 彩条发生模块
module color_bar(
input clk, //像素时钟输入，1280x720@60P的像素时钟为74.25
input rst, //复位,高有效
output hs, //行同步、高有效
output vs, //场同步、高有效
output de, //数据有效
output[7:0] rgb_r, //像素数据、红色分量
output[7:0] rgb_g, //像素数据、绿色分量
output[7:0] rgb_b //像素数据、蓝色分量
);
/*********视频时序参数定义******************************************/
parameter H_ACTIVE = 16'd1280; //行有效长度（像素时钟周期个数）
parameter H_FP = 16'd110; //行同步前肩长度
parameter H_SYNC = 16'd40; //行同步长度
parameter H_BP = 16'd220; //行同步后肩长度
parameter V_ACTIVE = 16'd720; //场有效长度（行的个数）
parameter V_FP = 16'd5; //场同步前肩长度
parameter V_SYNC = 16'd5; //场同步长度
parameter V_BP = 16'd20; //场同步后肩长度
parameter H_TOTAL = H_ACTIVE + H_FP + H_SYNC + H_BP;//行总长度
parameter V_TOTAL = V_ACTIVE + V_FP + V_SYNC + V_BP;//场总长度
/*********彩条RGB color bar颜色参数定义*****************************/
parameter WHITE_R = 8'hff;
parameter WHITE_G = 8'hff;
parameter WHITE_B = 8'hff;
parameter YELLOW_R = 8'hff;
parameter YELLOW_G = 8'hff;
parameter YELLOW_B = 8'h00;
parameter CYAN_R = 8'h00;
parameter CYAN_G = 8'hff;
parameter CYAN_B = 8'hff;
parameter GREEN_R = 8'h00;
parameter GREEN_G = 8'hff;
parameter GREEN_B = 8'h00;
parameter MAGENTA_R = 8'hff;
parameter MAGENTA_G = 8'h00;
parameter MAGENTA_B = 8'hff;
parameter RED_R = 8'hff;
parameter RED_G = 8'h00;
parameter RED_B = 8'h00;
parameter BLUE_R = 8'h00;
parameter BLUE_G = 8'h00;
parameter BLUE_B = 8'hff;
parameter BLACK_R = 8'h00;
parameter BLACK_G = 8'h00;
parameter BLACK_B = 8'h00;
reg hs_reg;//定义一个寄存器,用于行同步
reg vs_reg;//定义一个寄存器,用户场同步
reg hs_reg_d0;//hs_reg一个时钟的延迟
//所有以_d0、d1、d2等为后缀的均为某个寄存器的延迟
reg vs_reg_d0;//vs_reg一个时钟的延迟
reg[11:0] h_cnt;//用于行的计数器
reg[11:0] v_cnt;//用于场（帧）的计数器
reg[11:0] active_x;//有效图像的的坐标x
reg[11:0] active_y;//有效图像的坐标y
reg[7:0] rgb_r_reg;//像素数据r分量
reg[7:0] rgb_g_reg;//像素数据g分量
reg[7:0] rgb_b_reg;//像素数据b分量
reg h_active;//行图像有效
reg v_active;//场图像有效
wire video_active;//一帧内图像的有效区域h_active & v_active
reg video_active_d0;
assign hs = hs_reg_d0;
assign vs = vs_reg_d0;
assign video_active = h_active & v_active;
assign de = video_active_d0;
assign rgb_r = rgb_r_reg;
assign rgb_g = rgb_g_reg;
assign rgb_b = rgb_b_reg;
always@(posedge clk or posedge rst)
begin
if(rst)
begin
hs_reg_d0 <= 1'b0;
vs_reg_d0 <= 1'b0;
video_active_d0 <= 1'b0;
end
else
begin
hs_reg_d0 <= hs_reg;
vs_reg_d0 <= vs_reg;
video_active_d0 <= video_active;
end
end
always@(posedge clk or posedge rst)
begin
if(rst)
h_cnt <= 12'd0;
else if(h_cnt == H_TOTAL - 1)//行计数器到最大值清零
h_cnt <= 12'd0;
else
h_cnt <= h_cnt + 12'd1;
end
always@(posedge clk or posedge rst)
begin
if(rst)
active_x <= 12'd0;
else if(h_cnt >= H_FP + H_SYNC + H_BP - 1)//计算图像的x坐标
active_x <= h_cnt - (H_FP[11:0] + H_SYNC[11:0] + H_BP[11:0] - 12'd1);
else
active_x <= active_x;
end
always@(posedge clk or posedge rst)
begin
if(rst)
active_y <= 12'd0;
else if(v_cnt >= V_FP + V_SYNC + V_BP - 1)//计算图像的x坐标
active_y <= v_cnt - (V_FP[11:0] + V_SYNC[11:0] + V_BP[11:0] - 12'd1);
else
active_y <= active_y;
end
always@(posedge clk or posedge rst)
begin
if(rst)
v_cnt <= 12'd0;
else if(h_cnt == H_FP - 1)//在行数计算器为H_FP - 1的时候场计数器+1或清零
if(v_cnt == V_TOTAL - 1)//场计数器到最大值了，清零
v_cnt <= 12'd0;
else
v_cnt <= v_cnt + 12'd1;//没到最大值，+1
else
v_cnt <= v_cnt;
end
always@(posedge clk or posedge rst)
begin
if(rst)
hs_reg <= 1'b0;
else if(h_cnt == H_FP - 1)//行同步开始了...
hs_reg <= 1'b1;
else if(h_cnt == H_FP + H_SYNC - 1)//行同步这时候要结束了
hs_reg <= 1'b0;
else
hs_reg <= hs_reg;
end
always@(posedge clk or posedge rst)
begin
if(rst)
h_active <= 1'b0;
else if(h_cnt == H_FP + H_SYNC + H_BP - 1)
h_active <= 1'b1;
else if(h_cnt == H_TOTAL - 1)
h_active <= 1'b0;
else
h_active <= h_active;
end
always@(posedge clk or posedge rst)
begin
if(rst)
vs_reg <= 1'd0;
else if((v_cnt == V_FP - 1) && (h_cnt == H_FP - 1))
vs_reg <= 1'b1;
else if((v_cnt == V_FP + V_SYNC - 1) && (h_cnt == H_FP - 1))
vs_reg <= 1'b0;
else
vs_reg <= vs_reg;
end
always@(posedge clk or posedge rst)
begin
if(rst)
v_active <= 1'd0;
else if((v_cnt == V_FP + V_SYNC + V_BP - 1) && (h_cnt == H_FP - 1))
v_active <= 1'b1;
else if((v_cnt == V_TOTAL - 1) && (h_cnt == H_FP - 1))
v_active <= 1'b0;
else
v_active <= v_active;
end
//`define X_AXIS_BAR
//`define Y_AXIS_BAR
`define CHESS_BAR
`ifdef X_AXIS_BAR
// 浠ヤ笅浜х敓姘村钩娴嬭瘯鏉★紝浣滀负涓€涓涔犲垵濮嬩簡瑙ｇ殑鍐呭锛
always@(posedge clk or posedge rst)
begin
if(rst)
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
else if(video_active)
if(active_x == 12'd0)
begin
rgb_r_reg <= WHITE_R;
rgb_g_reg <= WHITE_G;
rgb_b_reg <= WHITE_B;
end
else if(active_x == (H_ACTIVE/8) * 1)
begin
rgb_r_reg <= YELLOW_R;
rgb_g_reg <= YELLOW_G;
rgb_b_reg <= YELLOW_B;
end
else if(active_x == (H_ACTIVE/8) * 2)
begin
rgb_r_reg <= CYAN_R;
rgb_g_reg <= CYAN_G;
rgb_b_reg <= CYAN_B;
end
else if(active_x == (H_ACTIVE/8) * 3)
begin
rgb_r_reg <= GREEN_R;
rgb_g_reg <= GREEN_G;
rgb_b_reg <= GREEN_B;
end
else if(active_x == (H_ACTIVE/8) * 4)
begin
rgb_r_reg <= MAGENTA_R;
rgb_g_reg <= MAGENTA_G;
rgb_b_reg <= MAGENTA_B;
end
else if(active_x == (H_ACTIVE/8) * 5)
begin
rgb_r_reg <= RED_R;
rgb_g_reg <= RED_G;
rgb_b_reg <= RED_B;
end
else if(active_x == (H_ACTIVE/8) * 6)
begin
rgb_r_reg <= BLUE_R;
rgb_g_reg <= BLUE_G;
rgb_b_reg <= BLUE_B;
end
else if(active_x == (H_ACTIVE/8) * 7)
begin
rgb_r_reg <= BLACK_R;
rgb_g_reg <= BLACK_G;
rgb_b_reg <= BLACK_B;
end
else
begin
rgb_r_reg <= rgb_r_reg;
rgb_g_reg <= rgb_g_reg;
rgb_b_reg <= rgb_b_reg;
end
else
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
end
`endif
`ifdef Y_AXIS_BAR
// 浠ヤ笅浜х敓姘村钩娴嬭瘯鏉★紝浣滀负涓€涓涔犲垵濮嬩簡瑙ｇ殑鍐呭锛
always@(posedge clk or posedge rst)
begin
if(rst)
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
else if(video_active)
if(active_y >= 12'd0 && active_y < (V_ACTIVE/8))
begin
rgb_r_reg <= WHITE_R;
rgb_g_reg <= WHITE_G;
rgb_b_reg <= WHITE_B;
end
else if(active_y >= (V_ACTIVE/8) * 1 && active_y < (V_ACTIVE/8) * 2)
begin
rgb_r_reg <= YELLOW_R;
rgb_g_reg <= YELLOW_G;
rgb_b_reg <= YELLOW_B;
end
else if(active_y >= (V_ACTIVE/8) * 2 && active_y < (V_ACTIVE/8) * 3)
begin
rgb_r_reg <= CYAN_R;
rgb_g_reg <= CYAN_G;
rgb_b_reg <= CYAN_B;
end
else if(active_y >= (V_ACTIVE/8) * 3 && active_y < (V_ACTIVE/8) * 4)
begin
rgb_r_reg <= GREEN_R;
rgb_g_reg <= GREEN_G;
rgb_b_reg <= GREEN_B;
end
else if(active_y >= (V_ACTIVE/8) * 4 && active_y < (V_ACTIVE/8) * 5)
begin
rgb_r_reg <= MAGENTA_R;
rgb_g_reg <= MAGENTA_G;
rgb_b_reg <= MAGENTA_B;
end
else if(active_y >= (V_ACTIVE/8) * 5 && active_y < (V_ACTIVE/8) * 6)
begin
rgb_r_reg <= RED_R;
rgb_g_reg <= RED_G;
rgb_b_reg <= RED_B;
end
else if(active_y >= (V_ACTIVE/8) * 6 && active_y < (V_ACTIVE/8) * 7)
begin
rgb_r_reg <= BLUE_R;
rgb_g_reg <= BLUE_G;
rgb_b_reg <= BLUE_B;
end
else if(active_y >= (V_ACTIVE/8) * 7 && active_y < (V_ACTIVE/8) * 8)
begin
rgb_r_reg <= BLACK_R;
rgb_g_reg <= BLACK_G;
rgb_b_reg <= BLACK_B;
end
else
begin
rgb_r_reg <= rgb_r_reg;
rgb_g_reg <= rgb_g_reg;
rgb_b_reg <= rgb_b_reg;
end
else
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
end
`endif
`ifdef CHESS_BAR
wire [3 : 0]chess_xy;
assign chess_xy = active_x / (H_ACTIVE/8) + active_y / (H_ACTIVE/8);
// 浠ヤ笅浜х敓姘村钩娴嬭瘯鏉★紝浣滀负涓€涓涔犲垵濮嬩簡瑙ｇ殑鍐呭锛
always@(posedge clk or posedge rst)
begin
if(rst)
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
else if(video_active)
if(chess_xy[0] == 1'b0)
begin
rgb_r_reg <= WHITE_R;
rgb_g_reg <= WHITE_G;
rgb_b_reg <= WHITE_B;
end
else if(chess_xy[0] == 1'b1)
begin
rgb_r_reg <= BLACK_R;
rgb_g_reg <= BLACK_G;
rgb_b_reg <= BLACK_B;
end
else
begin
rgb_r_reg <= 8'h00;
rgb_g_reg <= 8'h00;
rgb_b_reg <= 8'h00;
end
end
`endif
endmodule
注意三种不同的格式，是通过`define来定义，通过条件编译来选下。
同时， 注意CHESS的黑白图的写法，比较简洁。通过产生一个8X8的块，然后做加法来做条件判断。