Tabs to spaces for razzle

behavioural/razzle.sv

-// 
-// Razzle generates a simple fractal type color image on a VGA monitor 
-// 
-// Jim Hamblen, Georgia Tech School of ECE 
-// Converted to SystemVerilog by Iain McNally
-// 
+// Description:
+// This code generates a VGA output for ARM SoC based on razzle code modified by Iain Mcnally
+//
+// Maintainer: Karthik Sathyanarayanan <ks6n19@soton.ac.uk>
+// Revision : $Revision$
 
  
 module razzle ( 
  
-        input logic CLOCK_50, 
+		input logic CLOCK_50, 
 		input logic [3:0] KEY,
 		input logic [10:0] x1, x2, y1, y2,
-        output logic [7:0] VGA_R,VGA_G,VGA_B, 
-        output logic VGA_HS,VGA_VS, VGA_CLK, VGA_BLANK_N); 
+    	output logic [7:0] VGA_R,VGA_G,VGA_B, 
+    	output logic VGA_HS,VGA_VS, VGA_CLK, VGA_BLANK_N); 
        		 
 // Video Display Signals    
 logic [10:0] H_count,V_count; 
@@ -37,9 +36,6 @@ assign VGA_B = Blue ? 255 : 0;
 assign VGA_CLK = clock_enable;
 assign VGA_BLANK_N = video_on;
 
-// interchange values of x1, x2, y1 , y2 to get a square on black screen 
-
-
 
 // Colors for pixel data on video signal 
 assign Red_Data = red_square ; 
@@ -57,40 +53,37 @@ assign video_on = video_on_H && video_on_V;
 // Red square calculation
 
 always @(posedge CLOCK_50, negedge nReset)
-  if ( ! nReset)
-    begin
-      red_square = 0;
-    end
-  else
-    begin : FRACTAL_COMPUTE 
-      if ( video_on )
-	begin
-	  if ( y1 < V_count < y2 )
-			if (  x2 < H_count < x1 )
-				red_square = 0 ; 
-	  else 
-	    red_square = 1 ; 	
-		
-
-
-	end
-    end : FRACTAL_COMPUTE
+	if ( ! nReset)
+		begin
+			red_square = 0;
+		end
+	else
+		begin : FRACTAL_COMPUTE 
+		if ( video_on )
+		begin
+			if ( y1 < V_count < y2 )
+				if (  x2 < H_count < x1 )
+					red_square = 0 ; 
+				else 
+	    			red_square = 1 ; 	
+		end
+    	end : FRACTAL_COMPUTE
      
-//Generate Horizontal and Vertical Timing Signals for Video Signal 
-//For details see Rapid Prototyping of Digital Systems Chapter 9 
+// Generate Horizontal and Vertical Timing Signals for Video Signal 
 //VIDEO_DISPLAY 
 
 always @(posedge CLOCK_50, negedge nReset)
   if ( ! nReset) 
     begin
-      clock_enable = 0; 
-      H_count = 0; 
-      V_count = 0; 
-      video_on_H = 0; 
-      video_on_V = 0; 
+		clock_enable = 0; 
+		H_count = 0; 
+		V_count = 0; 
+		video_on_H = 0; 
+		video_on_V = 0; 
     end
-  else
-    begin : VIDEO_DISPLAY
+	
+	else
+	begin : VIDEO_DISPLAY
       // Clock enable used for a 24Mhz video clock rate 
       // 640 by 480 display mode needs close to a 25Mhz pixel clock 
       // 24Mhz should work on most new monitors 
@@ -104,53 +97,53 @@ always @(posedge CLOCK_50, negedge nReset)
       //   0                           640   659       755    799 
       // 
 
-      if ( clock_enable )
-	begin 
-	  if (H_count >= 799)
-	     H_count = 0; 
-	  else 
-	     H_count = H_count + 1; 
+		if ( clock_enable )
+		begin 
+			if (H_count >= 799)
+				H_count = 0; 
+			else 
+				H_count = H_count + 1; 
 
-	  //Generate Horizontal Sync Signal 
-	  if ((H_count <= 755) && (H_count >= 659))
+	  // Generate Horizontal Sync Signal 
+		if ((H_count <= 755) && (H_count >= 659))
 	     VGA_HS = 0; 
-	  else 
+		else 
 	     VGA_HS = 1; 
 
-	  //V_count counts rows of pixels (480 + extra time for sync signals) 
+	  // V_count counts rows of pixels (480 + extra time for sync signals) 
 	  // 
 	  //  <---- 480 Horizontal Syncs (pixel rows) -->  ->V Sync<- 
 	  //  -----------------------------------------------_______------------ 
 	  //  0                                       480    493-494          524 
 	  // 
-	  if ((V_count >= 524) && (H_count >= 699))
-	     V_count = 0; 
-	  else if (H_count == 699)
-	     V_count = V_count + 1; 
+		if ((V_count >= 524) && (H_count >= 699))
+			V_count = 0; 
+		else if (H_count == 699)
+			V_count = V_count + 1; 
 
 
 	  // Generate Vertical Sync Signal 
-	  if ((V_count <= 494) && (V_count >= 493))
-	     VGA_VS = 0; 
-	  else 
-	     VGA_VS = 1; 
+		if ((V_count <= 494) && (V_count >= 493))
+			VGA_VS = 0; 
+		else 
+			VGA_VS = 1; 
 
 
 	  // Generate Video on Screen Signals for Pixel Data 
-	  if (H_count <= 639) 
-	     video_on_H = 1; 
-	  else 
-	     video_on_H = 0; 
+		if (H_count <= 639) 
+			video_on_H = 1; 
+		else 
+			video_on_H = 0; 
 
 
-	  if (V_count <= 479)
-	     video_on_V = 1; 
-	  else 
-	     video_on_V = 0; 
+		if (V_count <= 479)
+			video_on_V = 1; 
+		else 
+			video_on_V = 0; 
 
 	end 
 
-    end : VIDEO_DISPLAY
+	end : VIDEO_DISPLAY