X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/09c1936c32d74947896338a1c57270b2918656f8..aebd667080a34f41a93e3cf79a6c91cb2e6aaa37:/Soundcore.v

diff --git a/Soundcore.v b/Soundcore.v
index 16d6067..70c4db1 100644
--- a/Soundcore.v
+++ b/Soundcore.v
@@ -12,29 +12,41 @@ module Soundcore(
 	output reg snd_data_r
 	);
 
-	reg [7:0] nr50,nr51,nr52;
-	reg [3:0] pwmcnt;
-	reg [4:0] cntclk;
+	reg [7:0] nr50 = 8'h00, nr51 = 8'h00, nr52 = 8'hF0;
+	reg [3:0] pwmcnt = 4'b0000;
+	reg [4:0] cntclk = 5'b00000;
 	reg [13:0] lenclk;
 	wire [3:0] sndout1,sndout2,sndout3,sndout4;
-	wire [3:0] right_snd = nr51[0] ? sndout1 : 4'b0;
-	wire [3:0] left_snd = nr51[4] ? sndout1 : 4'b0;
-
+	wire [3:0] right_snd =
+		(nr51[0] ? sndout1 : 4'b0) +
+		(nr51[1] ? sndout2 : 4'b0) +
+		(nr51[2] ? sndout3 : 4'b0) +
+		(nr51[3] ? sndout4 : 4'b0);
+	wire [3:0] left_snd =
+		(nr51[4] ? sndout1 : 4'b0) +
+		(nr51[5] ? sndout2 : 4'b0) +
+		(nr51[6] ? sndout3 : 4'b0) +
+		(nr51[7] ? sndout4 : 4'b0);
 	assign sndout3 = 0;
 	assign sndout4 = 0;
-
-	assign data = rd ?
-	                 addr == `ADDR_NR50 ? nr50 :
-	                 addr == `ADDR_NR51 ? nr51 :
-	                 addr == `ADDR_NR52 ? nr52 : 8'bzzzzzzzz
+	
+	reg rdlatch;
+	reg [15:0] addrlatch;
+	
+	assign data = rdlatch ?
+	                 addrlatch == `ADDR_NR50 ? nr50 :
+	                 addrlatch == `ADDR_NR51 ? nr51 :
+	                 addrlatch == `ADDR_NR52 ? nr52 : 8'bzzzzzzzz
 		      : 8'bzzzzzzzz;
 
-	always @ (negedge core_clk) begin
+	always @ (posedge core_clk) begin
+		rdlatch <= rd;
+		addrlatch <= addr;
 		if(wr) begin
 			case(addr)
 			`ADDR_NR50: nr50 <= data;
 			`ADDR_NR51: nr51 <= data;
-			`ADDR_NR52: nr52 <= {data[7],3'b1,data[3:0]};
+			`ADDR_NR52: nr52 <= {data[7],7'b1111111};
 			endcase
 		end
 		cntclk <= cntclk + 1;
@@ -52,7 +64,7 @@ module Soundcore(
 		.data(data),
 		.cntclk(cntclk[4]),
 		.lenclk(lenclk[13]),
-		.en(nr52[7] & nr52[0]),
+		.en(nr52[7]),
 		.snd_data(sndout1)
 	);
 	
@@ -64,7 +76,7 @@ module Soundcore(
 		.data(data),
 		.cntclk(cntclk[4]),
 		.lenclk(lenclk[13]),
-		.en(nr52[7] & nr52[0]),
+		.en(nr52[7]),
 		.snd_data(sndout2)
 	);