From 4ead7d4d5b77f52aaaac70c2abf8b3848b7fb4d3 Mon Sep 17 00:00:00 2001
From: jaseg <git-bigdata-wsl-arch@jaseg.de>
Date: Thu, 24 Jun 2021 12:26:32 +0200
Subject: [PATCH] HDMI output first signs of life

---
 src/hdmi_io.vhd |  2 +-
 src/top.v       | 71 +++++++++++++++----------------------------------
 2 files changed, 23 insertions(+), 50 deletions(-)

diff --git a/src/hdmi_io.vhd b/src/hdmi_io.vhd
index 5fd598a..747ec5a 100644
--- a/src/hdmi_io.vhd
+++ b/src/hdmi_io.vhd
@@ -386,7 +386,7 @@ i_hdmi_input : hdmi_input port map (
         -- Pixel and serializer clocks 
         pixel_clk       => pixel_clk_i,
         pixel_io_clk_x1 => pixel_io_clk_x1,
-        pixel_io_clk_x5 => pixel_io_clk_x5,    
+        pixel_io_clk_x5 => pixel_io_clk_x5,
         --- HDMI input signals
         hdmi_in_clk   => tmds_in_clk,
         hdmi_in_ch0   => tmds_in_ch0,
diff --git a/src/top.v b/src/top.v
index 2cb67c8..d88d900 100644
--- a/src/top.v
+++ b/src/top.v
@@ -25,13 +25,6 @@ module proc_top(
 
 /* Color bar generator */
 
-parameter CB_HRES = 1280;
-parameter CB_VRES = 768;
-parameter CB_H_FP = 64;
-parameter CB_H_BP = 192;
-parameter CB_V_FP = 3;
-parameter CB_V_BP = 20;
-
 reg [11:0] cb_x = 0;
 reg [11:0] cb_y = 0;
 reg [11:0] cb_cnt = 0;
@@ -50,59 +43,39 @@ assign out_green = cb_green;
 assign out_blue = cb_blue;
 
 always @(posedge clk) begin
-	cb_x <= cb_x + 1;
+	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
 	
-	if (cb_x == 12'h003) begin
+	if (cb_x == 1280+72-1) begin
 		cb_hsync <= 1;
-	end else if (cb_x == 12'h010) begin
+	end else if (cb_x == 1280+72+80-1) begin
 		cb_hsync <= 0;
 	end
 	
-	if (cb_x == CB_H_FP + CB_HRES + CB_H_BP - 1) begin
+	if (cb_x == 1648-1) begin
 		cb_x <= 0;
-		cb_y <= cb_y + 1;
 		
-		cb_vsync <= (cb_y == 2) || (cb_y == 3);
+		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 == 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
+		if (cb_y == 750-1) begin
 			cb_y <= 0;
+		end else begin
+			cb_y <= cb_y + 1;
 		end
 		
-	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 else begin
+		cb_x <= cb_x + 1;
 	end
 end