From bc75fc673a7453cb5b9077d70695d3525d13366d Mon Sep 17 00:00:00 2001
From: Joshua Wise <joshua@rebirth.joshuawise.com>
Date: Fri, 9 May 2008 08:07:34 -0400
Subject: [PATCH] PS2 cut 1

---
 CoreTop.prj |  1 +
 CoreTop.ucf |  2 ++
 Makefile    |  2 +-
 PS2Button.v | 16 +++++-----------
 System.v    | 23 ++++++++++++++++++++++-
 5 files changed, 31 insertions(+), 13 deletions(-)

diff --git a/CoreTop.prj b/CoreTop.prj
index 0df5890..4f1c839 100644
--- a/CoreTop.prj
+++ b/CoreTop.prj
@@ -12,3 +12,4 @@ verilog work "Sound1.v"
 verilog work "Sound2.v"
 verilog work "Soundcore.v"
 verilog work "Buttons.v"
+verilog work "PS2Button.v"
diff --git a/CoreTop.ucf b/CoreTop.ucf
index 1981fcd..d065b22 100644
--- a/CoreTop.ucf
+++ b/CoreTop.ucf
@@ -103,3 +103,5 @@ NET "cr_A<20>" LOC="K3" | SLEW="fast";
 NET "cr_A<21>" LOC="D1" | SLEW="fast";
 NET "cr_A<22>" LOC="K6" | SLEW="fast";
 
+NET "PS2C" LOC="R12";
+NET "PS2D" LOC="P11";
\ No newline at end of file
diff --git a/Makefile b/Makefile
index f42e5b9..15107c3 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 VLOGS = 7seg.v Framebuffer.v GBZ80Core.v Interrupt.v LCDC.v Sound1.v \
-	Sound2.v Soundcore.v System.v Timer.v Uart.v  Buttons.v
+	Sound2.v Soundcore.v System.v Timer.v Uart.v Buttons.v PS2Button.v
 
 VLOGS_ALL = $(VLOGS) insn_call-callcc.v insn_incdec16.v insn_jr-jrcc.v \
 	insn_ld_reg_hl.v insn_ld_reg_reg.v insn_nop.v insn_ret-retcc.v \
diff --git a/PS2Button.v b/PS2Button.v
index e65226c..571af43 100644
--- a/PS2Button.v
+++ b/PS2Button.v
@@ -1,19 +1,13 @@
 module PS2Button(
 	input inclk,
 	input indata,
-	input rst,
-	output outclk,
-	output outdata,
-	output reg [7:0] buttons
+	output wire [7:0] buttons
 	);
 
-	assign outdata = 1'b1;
-	assign outclk = 1'b1;
-
-	reg bitcount [3:0] = 0;
-	reg [7:0] key;
-	reg keyarrow, keyup, parity;
-	reg key_a,key_b,key_st,key_sel,key_up,key_dn,key_l,key_r;
+	reg [3:0] bitcount = 0;
+	reg [7:0] key = 0;
+	reg keyarrow = 0, keyup = 0, parity = 0;
+	reg key_a = 0,key_b = 0,key_st = 0,key_sel = 0,key_up = 0,key_dn = 0,key_l = 0,key_r = 0;
 
 	assign buttons = {key_st,key_sel,key_b,key_a,key_dn,key_up,key_l,key_r};
 
diff --git a/System.v b/System.v
index 931e900..68de591 100644
--- a/System.v
+++ b/System.v
@@ -232,6 +232,7 @@ module CoreTop(
 	output wire cr_nADV, cr_nCE, cr_nOE, cr_nWE, cr_CRE, cr_nLB, cr_nUB, cr_CLK,
 	output wire [22:0] cr_A,
 	inout [15:0] cr_DQ,
+	input ps2c, ps2d,
 `endif
 	output wire hs, vs,
 	output wire [2:0] r, g,
@@ -256,6 +257,7 @@ module CoreTop(
 	IBUFG iclkbuf(.O(xtalb), .I(xtal));
 	CPUDCM dcm (.CLKIN_IN(xtalb), .CLKFX_OUT(clk));
 	pixDCM pixdcm (.CLKIN_IN(xtalb), .CLKFX_OUT(vgaclk));
+	wire [7:0] ps2buttons;
 `endif
 
 	wire [15:0] addr [1:0];
@@ -348,16 +350,31 @@ module CoreTop(
 		.vgag(g),
 		.vgab(b));
 
+	wire [7:0] sleds;
+`ifdef isim
+	assign leds = sleds;
+`else
+	assign leds = sleds | ps2buttons;
+`endif
 	Switches sw(
 		.clk(clk),
 		.address(addr[0]),
 		.data(data[0]),
 		.wr(wr[0]),
 		.rd(rd[0]),
-		.ledout(leds),
+		.ledout(sleds),
 		.switches(switches)
 		);
 	
+`ifdef isim
+`else
+	PS2Button ps2(
+		.inclk(ps2c),
+		.indata(ps2d),
+		.buttons(ps2buttons)
+		);
+`endif
+	
 	Buttons ass(
 		.core_clk(clk),
 		.addr(addr[0]),
@@ -365,7 +382,11 @@ module CoreTop(
 		.wr(wr[0]),
 		.rd(rd[0]),
 		.int(btnirq),
+	`ifdef isim
 		.buttons(switches)
+	`else
+		.buttons(ps2buttons)
+	`endif
 		);
 
 	AddrMon amon(
-- 
2.43.0