X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/a02672555adf08bfd6755cf70599895dd2155a24..fc443a4f61b38236a17ab2928bd90327edc68266:/Uart.v

diff --git a/Uart.v b/Uart.v
index 1cc839a..3dd1532 100644
--- a/Uart.v
+++ b/Uart.v
@@ -1,4 +1,4 @@
-`define IN_CLK 8400000
+`define IN_CLK 8388608
 `define OUT_CLK 9600
 `define CLK_DIV `IN_CLK / `OUT_CLK
 `define MMAP_ADDR 16'hFF50
@@ -8,30 +8,35 @@ module UART(
 	input wr,
 	input rd,
 	input [15:0] addr,
-	input [7:0] data,
-	output reg serial);
+	inout [7:0] data,
+	output reg serial = 1);
+	
+	wire decode = (addr == `MMAP_ADDR);
+	
+	wire [7:0] odata;
+	assign data = (rd && decode) ? odata : 8'bzzzzzzzz;
 
 	reg [7:0] data_stor = 0;
 	reg [15:0] clkdiv = 0;
 	reg have_data = 0;
-	reg data_end = 0;
 	reg [3:0] diqing = 4'b0000;
 	
-	wire new = (wr) && (!have_data) && (addr == `MMAP_ADDR);
+	wire new = (wr) && (!have_data) && decode;
+	
+	assign odata = have_data ? 8'b1 : 8'b0;
 
 	always @ (negedge clk)
 	begin
-`define FUQING 4'b1010
 		/* deal with diqing */
 		if(new) begin
-			data_stor <= ~data;
+			data_stor <= data;
 			have_data <= 1;
 			diqing <= 4'b0000;
 		end else if (clkdiv == 0) begin
 			diqing <= diqing + 1;
 			if (have_data)
 				case (diqing)
-				4'b0000: serial <= 1;
+				4'b0000: serial <= 0;
 				4'b0001: serial <= data_stor[0];
 				4'b0010: serial <= data_stor[1];
 				4'b0011: serial <= data_stor[2];
@@ -40,7 +45,7 @@ module UART(
 				4'b0110: serial <= data_stor[5];
 				4'b0111: serial <= data_stor[6];
 				4'b1000: serial <= data_stor[7];
-				4'b1001: serial <= 0;
+				4'b1001: serial <= 1;
 				4'b1010: have_data <= 0;
 				default: $stop;
 			endcase