X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/68ce013e5fe7c5d1c4e07fe8ba1eb0ba2855b280..9e1c03b633deae6254b6df312a48eba6047e266e:/Interrupt.v

diff --git a/Interrupt.v b/Interrupt.v
index fcc396b..201c328 100644
--- a/Interrupt.v
+++ b/Interrupt.v
@@ -13,16 +13,20 @@ module Interrupt(
 	input serial,
 	input buttons,
 	output master,
+	input ack,
 	output [7:0] jaddr);
 
 	wire [7:0] iflag = {3'b0,buttons,serial,tovf,lcdc,vblank};
 	reg [7:0] imask = 16'hFFFF;
 	reg [7:0] ihold = 8'b0;
 	wire [7:0] imasked = ihold & imask;
+	
+	reg rdlatch = 0;
+	reg [15:0] addrlatch = 0;
 
-	assign data = rd ?
-	                 (addr == `ADDR_IF) ? ihold :
-	                 (addr == `ADDR_IE) ? imask :
+	assign data = rdlatch ?
+	                 (addrlatch == `ADDR_IF) ? ihold :
+	                 (addrlatch == `ADDR_IE) ? imask :
 	                 8'bzzzzzzzz :
 		      8'bzzzzzzzz;
 
@@ -42,9 +46,18 @@ module Interrupt(
 			`ADDR_IE : begin imask <= data; ihold <= ihold | iflag; end
 			endcase
 			
-		end
+		end else if (ack)
+			ihold <= ihold &
+				(imasked[0] ? 8'b11111110 :
+				 imasked[1] ? 8'b11111101 :
+				 imasked[2] ? 8'b11111011 :
+				 imasked[3] ? 8'b11110111 :
+				 imasked[4] ? 8'b11101111 :
+				 8'b11111111);
 		else
 			ihold <= ihold | iflag;
+		rdlatch <= rd;
+		addrlatch <= addr;
 	end
 
 endmodule