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Colorbars basics show up

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jaseg 2021-06-24 13:03:47 +02:00
parent 4ead7d4d5b
commit fce90e9269
1 changed files with 48 additions and 25 deletions
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73
src/top.v
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@ -25,6 +25,13 @@ module proc_top(
/* Color bar generator */
parameter CB_HRES = 1280;
parameter CB_VRES = 720;
parameter CB_H_FP = 68;
parameter CB_H_BP = 300;
parameter CB_V_FP = 25;
parameter CB_V_BP = 5;
reg [11:0] cb_x = 0;
reg [11:0] cb_y = 0;
reg [11:0] cb_cnt = 0;
@ -43,39 +50,55 @@ assign out_green = cb_green;
assign out_blue = cb_blue;
always @(posedge clk) begin
cb_red <= 8'hff;
cb_green <= 8'h00;
cb_blue <= 8'h00;
if (cb_x == 1279) begin
cb_blank <= 1;
end else if (cb_x == 1648-1 && (cb_y == 749 || cb_y < 719)) begin
cb_blank <= 0;
end
cb_x <= cb_x + 1;
if (cb_x == 1280+72-1) begin
cb_hsync <= 1;
end else if (cb_x == 1280+72+80-1) begin
cb_hsync <= 0;
end
cb_hsync <= cb_x >= 8 && cb_x <= 15;
cb_vsync <= cb_y >= 4 && cb_y <= 7;
if (cb_x == 1648-1) begin
if (cb_x == CB_H_FP + CB_HRES + CB_H_BP - 1) begin
cb_x <= 0;
cb_y <= cb_y + 1;
if (cb_y == 720+3-1) begin
cb_vsync <= 1;
end else if (cb_y == 720+3+5-1) begin
cb_vsync <= 0;
end
if (cb_y == 750-1) begin
if (cb_y == CB_V_FP - 1) begin
cb_vactive <= 1;
end else if (cb_y == CB_V_FP + CB_VRES - 1) begin
cb_vactive <= 0;
end else if (cb_y == CB_V_FP + CB_VRES + CB_V_BP - 1) begin
cb_y <= 0;
end else begin
cb_y <= cb_y + 1;
end
end else begin
cb_x <= cb_x + 1;
end else if (cb_vactive && (cb_x == CB_H_FP - 1)) begin
cb_red <= 0;
cb_green <= 0;
cb_blue <= 0;
cb_blank <= 0;
cb_cnt <= 0;
cb_bar <= 0;
end else if (cb_vactive && (cb_x == CB_H_FP + CB_HRES - 1)) begin
cb_blank <= 1;
end
if (!cb_blank) begin
cb_cnt <= cb_cnt + 1;
if (cb_cnt == 255) begin
cb_cnt <= 0;
cb_bar <= cb_bar + 1;
if (cb_bar == 7) begin
cb_bar <= 0;
end
cb_red <= {8{cb_bar[0]}};
cb_green <= {8{cb_bar[1]}};
cb_blue <= {8{cb_bar[2]}};
end
end
end