X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/a8f4468d0cd6910eba8031e21038d76857a2c107..f327eee1f228769c4753a3f2279063c99f6f1ab0:/LCDC.v

diff --git a/LCDC.v b/LCDC.v
index add6893..c550288 100644
--- a/LCDC.v
+++ b/LCDC.v
@@ -135,8 +135,8 @@ module LCDC(
 	 * Tile data from 8000-8FFF or 8800-97FF
 	 * Background tile maps 9800-9BFF or 9C00-9FFF
 	 */
-	reg [7:0] tiledatahigh [3071:0];
-	reg [7:0] tiledatalow [3071:0];
+	reg [7:0] tiledatahigh [6143:0];
+	reg [7:0] tiledatalow [6143:0];
 	reg [7:0] bgmap1 [1023:0];
 	reg [7:0] bgmap2 [1023:0];
 	
@@ -146,14 +146,19 @@ module LCDC(
 	// The new tile data is latched and ready when vxpos[2:0] is 3'b000!
 	wire [7:0] vxpos_ = vxpos + 1;
 	wire [9:0] bgmapaddr = {vypos[7:3], vxpos_[7:3]};
-	reg [7:0] tileno;
-	wire [10:0] tileaddr = {tileno, vypos[2:0]};
+	reg [7:0] tileno1;
+	reg [7:0] tileno2;
+	wire [7:0] tileno = rLCDC[3] ? tileno2 : tileno1;
+	wire [11:0] tileaddr =
+		{(rLCDC[4] ? {1'b0,tileno} : (9'b100000000 + {tileno[7],tileno})),
+		vypos[2:0]};
 	reg [7:0] tilehigh, tilelow;
 	wire [1:0] prepal = {tilehigh[7-vxpos[2:0]], tilelow[7-vxpos[2:0]]};
-	assign pixdata = {rBGP[{prepal,1'b1}],rBGP[{prepal,1'b0}]};
+	assign pixdata = 2'b11-{rBGP[{prepal,1'b1}],rBGP[{prepal,1'b0}]};
 	
 	wire decode_tiledata = (addr >= 16'h8000) && (addr <= 16'h97FF);
 	wire decode_bgmap1 = (addr >= 16'h9800) && (addr <= 16'h9BFF);
+	wire decode_bgmap2 = (addr >= 16'h9C00) && (addr <= 16'h9FFF);
 
 	wire [9:0] bgmapaddr_in = vraminuse ? bgmapaddr : addr[9:0];
 	wire [11:0] tileaddr_in = vraminuse ? tileaddr : addr[12:1];
@@ -161,10 +166,15 @@ module LCDC(
 	always @(posedge clk)
 	begin
 		if ((vraminuse && ((posx == 2) || (vxpos[2:0] == 3'b111))) || decode_bgmap1) begin
-			tileno <= bgmap1[bgmapaddr_in];
+			tileno1 <= bgmap1[bgmapaddr_in];
 			if (wr && decode_bgmap1 && ~vraminuse)
 				bgmap1[bgmapaddr_in] <= data;
 		end
+		if ((vraminuse && ((posx == 2) || (vxpos[2:0] == 3'b111))) || decode_bgmap2) begin
+			tileno2 <= bgmap2[bgmapaddr_in];
+			if (wr && decode_bgmap2 && ~vraminuse)
+				bgmap2[bgmapaddr_in] <= data;
+		end
 		if ((vraminuse && ((posx == 3) || (vxpos[2:0] == 3'b000))) || decode_tiledata) begin
 			tilehigh <= tiledatahigh[tileaddr_in];
 			tilelow <= tiledatalow[tileaddr_in];