ps2keyboard.v

Verilog, c and asm source codes of the Minimig system, a fpga implementation of the Amiga computer.

	if(reset)
		kbdrststatus[1]<=1;
	else if (valid && aleft)
		kbdrststatus[1]<=keydat[7];
	//latch status of right alt key
	if(reset)
		kbdrststatus[0]<=1;
	else if (valid && aright)
		kbdrststatus[0]<=keydat[7];
end
assign kbdrst=~(kbdrststatus[2]|kbdrststatus[1]|kbdrststatus[0]);//reset if all 3 keys down

endmodule

//-------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------
//-------------------------------------------------------------------------------------------------

//ps2 key to amiga key mapper using blockram
//this module also handles the osdctrl signals
module ps2keyboardmap
(
	input 	clk,		    	//clock
	input	reset,				//reset
	input	enable,				//enable
	input 	[7:0]ps2key,		//ps2 key code input
	output	valid,				//amiga key code valid (strobed when new valid keycode at output) 
	output	[7:0]akey,		//amiga key code output
	output	ctrl,	  			//amiga control key
	output	aleft, 				//amiga left alt key
	output	aright,	   			//amiga right alt key
	output	caps,	   			//amiga capslock key
	output	reg[5:0]osdctrl	//osd menu control
);

//local signals
reg		[15:0]keyrom;			//rom output
reg		enable2;				//enable signal delayed by one clock
reg		upstroke;				//upstroke key status
reg		extended;				//extended key status			

//generate delayed enable signal (needed because of blockram pipelining)
always @(posedge clk)
	enable2<=enable;

//latch special ps2 keycodes
//keyrom[7] is used together with [0], [1] and [2] for ps2 special codes decoding
//these are needed for complete decoding of the ps2 codes
always @(posedge clk)
	if(reset)//reset
	begin
		upstroke<=0;
		extended<=0;
	end
	else if(enable2 && keyrom[7] && keyrom[0])//extended key identifier found
		extended<=1;
	else if(enable2 && keyrom[7] && keyrom[1])//upstroke identifier found
		upstroke<=1;
	else if(enable2 && !(keyrom[7]&&keyrom[2]))//other key found and it was not an ack, reset both status bits
	begin
		upstroke<=0;
		extended<=0;
	end

//assign all output signals
//keyrom[6:0]=amiga keycode
assign valid=keyrom[15]&enable2;
assign ctrl=keyrom[14];
assign aleft=keyrom[13];
assign aright=keyrom[12];
assign caps=keyrom[11];
assign akey[7:0]={upstroke,keyrom[6:0]};

//osd control handling
//keyrom[8] is used together with [0],[1],[2] and [3] for osd key decoding
always @(posedge clk)
begin
	if(reset)
		osdctrl[5:0] <= 0;
	else if(enable2 && keyrom[8])
		osdctrl[5:0] <= keyrom[5:0] & {6{~upstroke}};
end

//-------------------------------------------------------------------------------------------------

//here follows the ps2 to Amiga key romtable:
//standard decodes
//[6:0]=amiga key code
//[15]=valid amiga key (present in rom)
//decodes for special function keys :
//[14]=control key
//[13]=left alt key
//[12]=right alt key
//[11]=capslock key
//PS2 specific decodes:
//[7]&[0]=PS2 EXTENDED KEY
//[7]&[1]=PS2 UPSTROKE IDENTIFIER
//[7]&[2]=PS2 ACKNOWLEDGE
//OSD control decodes
//[8]&([0] or [1] or [2] or [3])
always @(posedge clk)
begin
	if(enable)
	begin
		case({extended,ps2key[7:0]})
			9'h000:		keyrom[15:0]<=16'h0000;
			9'h001:		keyrom[15:0]<=16'h8058;//F9
			9'h002:		keyrom[15:0]<=16'h0000;
			9'h003:		keyrom[15:0]<=16'h8054;//F5
			9'h004:		keyrom[15:0]<=16'h8052;//F3
			9'h005:		keyrom[15:0]<=16'h8050;//F1
			9'h006:		keyrom[15:0]<=16'h8051;//F2
			9'h007:		keyrom[15:0]<=16'h0108;//F12 <OSD MENU> MENU
			9'h008:		keyrom[15:0]<=16'h0000;
			9'h009:		keyrom[15:0]<=16'h8059;//F10
			9'h00a:		keyrom[15:0]<=16'h8057;//F8
			9'h00b:		keyrom[15:0]<=16'h8055;//F6
			9'h00c:		keyrom[15:0]<=16'h8053;//F4
			9'h00d:		keyrom[15:0]<=16'h8042;//TAB
			9'h00e:		keyrom[15:0]<=16'h8000;//~
			9'h00f:		keyrom[15:0]<=16'h0000;
			9'h010:		keyrom[15:0]<=16'h0000;
			9'h011:		keyrom[15:0]<=16'ha064;//LEFT ALT
			9'h012:		keyrom[15:0]<=16'h8060;//LEFT SHIFT
			9'h013:		keyrom[15:0]<=16'h0000;
			9'h014:		keyrom[15:0]<=16'hc063;//CTRL
			9'h015:		keyrom[15:0]<=16'h8010;//q
			9'h016:		keyrom[15:0]<=16'h8001;//1
			9'h017:		keyrom[15:0]<=16'h0000;
			9'h018:		keyrom[15:0]<=16'h0000;
			9'h019:		keyrom[15:0]<=16'h0000;
			9'h01a:		keyrom[15:0]<=16'h8031;//z
			9'h01b:		keyrom[15:0]<=16'h8021;//s
			9'h01c:		keyrom[15:0]<=16'h8020;//a
			9'h01d:		keyrom[15:0]<=16'h8011;//w
			9'h01e:		keyrom[15:0]<=16'h8002;//2
			9'h01f:		keyrom[15:0]<=16'h0000;
			9'h020:		keyrom[15:0]<=16'h0000;
			9'h021:		keyrom[15:0]<=16'h8033;//c
			9'h022:		keyrom[15:0]<=16'h8032;//x
			9'h023:		keyrom[15:0]<=16'h8022;//d
			9'h024:		keyrom[15:0]<=16'h8012;//e
			9'h025:		keyrom[15:0]<=16'h8004;//4
			9'h026:		keyrom[15:0]<=16'h8003;//3
			9'h027:		keyrom[15:0]<=16'h0000;
			9'h028:		keyrom[15:0]<=16'h0000;
			9'h029:		keyrom[15:0]<=16'h8040;//SPACE
			9'h02a:		keyrom[15:0]<=16'h8034;//v
			9'h02b:		keyrom[15:0]<=16'h8023;//f
			9'h02c:		keyrom[15:0]<=16'h8014;//t
			9'h02d:		keyrom[15:0]<=16'h8013;//t
			9'h02e:		keyrom[15:0]<=16'h8005;//5
			9'h02f:		keyrom[15:0]<=16'h0000;
			9'h030:		keyrom[15:0]<=16'h0000;
			9'h031:		keyrom[15:0]<=16'h8036;//n
			9'h032:		keyrom[15:0]<=16'h8035;//b
			9'h033:		keyrom[15:0]<=16'h8025;//h
			9'h034:		keyrom[15:0]<=16'h8024;//g
			9'h035:		keyrom[15:0]<=16'h8015;//y
			9'h036:		keyrom[15:0]<=16'h8006;//6
			9'h037:		keyrom[15:0]<=16'h0000;
			9'h038:		keyrom[15:0]<=16'h0000;
			9'h039:		keyrom[15:0]<=16'h0000;
			9'h03a:		keyrom[15:0]<=16'h8037;//m
			9'h03b:		keyrom[15:0]<=16'h8026;//j
			9'h03c:		keyrom[15:0]<=16'h8016;//u
			9'h03d:		keyrom[15:0]<=16'h8007;//7
			9'h03e:		keyrom[15:0]<=16'h8008;//8
			9'h03f:		keyrom[15:0]<=16'h0000;
			9'h040:		keyrom[15:0]<=16'h0000;
			9'h041:		keyrom[15:0]<=16'h8038;//<
			9'h042:		keyrom[15:0]<=16'h8027;//k
			9'h043:		keyrom[15:0]<=16'h8017;//i
			9'h044:		keyrom[15:0]<=16'h8018;//o
			9'h045:		keyrom[15:0]<=16'h800a;//0
			9'h046:		keyrom[15:0]<=16'h8009;//9
			9'h047:		keyrom[15:0]<=16'h0000;
			9'h048:		keyrom[15:0]<=16'h0000;
			9'h049:		keyrom[15:0]<=16'h8039;//>
			9'h04a:		keyrom[15:0]<=16'h803a;//FORWARD SLASH
			9'h04b:		keyrom[15:0]<=16'h8028;//l
			9'h04c:		keyrom[15:0]<=16'h8029;//;
			9'h04d:		keyrom[15:0]<=16'h8019;//p
			9'h04e:		keyrom[15:0]<=16'h800b;//-
			9'h04f:		keyrom[15:0]<=16'h0000;
			9'h050:		keyrom[15:0]<=16'h0000;
			9'h051:		keyrom[15:0]<=16'h0000;
			9'h052:		keyrom[15:0]<=16'h802a;//"
			9'h053:		keyrom[15:0]<=16'h0000;
			9'h054:		keyrom[15:0]<=16'h801a;//[
			9'h055:		keyrom[15:0]<=16'h800c;//=
			9'h056:		keyrom[15:0]<=16'h0000;
			9'h057:		keyrom[15:0]<=16'h0000;
			9'h058:		keyrom[15:0]<=16'h8862;//CAPSLOCK
			9'h059:		keyrom[15:0]<=16'h8061;//RIGHT SHIFT
			9'h05a:		keyrom[15:0]<=16'h8044;//ENTER
			9'h05b:		keyrom[15:0]<=16'h801b;//]
			9'h05c:		keyrom[15:0]<=16'h0000;
			9'h05d:		keyrom[15:0]<=16'h800d;//BACKSLASH
			9'h05e:		keyrom[15:0]<=16'h0000;
			9'h05f:		keyrom[15:0]<=16'h0000;
			9'h060:		keyrom[15:0]<=16'h0000;
			9'h061:		keyrom[15:0]<=16'h0000;
			9'h062:		keyrom[15:0]<=16'h0000;
			9'h063:		keyrom[15:0]<=16'h0000;
			9'h064:		keyrom[15:0]<=16'h0000;
			9'h065:		keyrom[15:0]<=16'h0000;
			9'h066:		keyrom[15:0]<=16'h8041;//BACKSPACE
			9'h067:		keyrom[15:0]<=16'h0000;
			9'h068:		keyrom[15:0]<=16'h0000;
			9'h069:		keyrom[15:0]<=16'h801d;//KP 1
			9'h06a:		keyrom[15:0]<=16'h0000;
			9'h06b:		keyrom[15:0]<=16'h802d;//KP 4
			9'h06c:		keyrom[15:0]<=16'h803d;//KP 7
			9'h06d:		keyrom[15:0]<=16'h0000;
			9'h06e:		keyrom[15:0]<=16'h0000;
			9'h06f:		keyrom[15:0]<=16'h0000;
			9'h070:		keyrom[15:0]<=16'h800f;//KP 0
			9'h071:		keyrom[15:0]<=16'h803c;//KP .
			9'h072:		keyrom[15:0]<=16'h801e;//KP 2
			9'h073:		keyrom[15:0]<=16'h802e;//KP 5
			9'h074:		keyrom[15:0]<=16'h802f;//KP 6
			9'h075:		keyrom[15:0]<=16'h803e;//KP 8
			9'h076:		keyrom[15:0]<=16'h8045;//ESCAPE
			9'h077:		keyrom[15:0]<=16'h805a;//NUM LOCK / KP (
			9'h078:		keyrom[15:0]<=16'h805f;//HELP (F11)
			9'h079:		keyrom[15:0]<=16'h805e;//KP +
			9'h07a:		keyrom[15:0]<=16'h801f;//KP 3
			9'h07b:		keyrom[15:0]<=16'h804a;//KP -
			9'h07c:		keyrom[15:0]<=16'h805d;//KP *
			9'h07d:		keyrom[15:0]<=16'h803f;//KP 9
			9'h07e:		keyrom[15:0]<=16'h805b;//SCROLL LOCK / KP )
			9'h07f:		keyrom[15:0]<=16'h0000;
			9'h080:		keyrom[15:0]<=16'h0000;
			9'h081:		keyrom[15:0]<=16'h0000;
			9'h082:		keyrom[15:0]<=16'h0000;
			9'h083:		keyrom[15:0]<=16'h8056;//F7
			9'h084:		keyrom[15:0]<=16'h0000;
			9'h085:		keyrom[15:0]<=16'h0000;
			9'h086:		keyrom[15:0]<=16'h0000;
			9'h087:		keyrom[15:0]<=16'h0000;
			9'h088:		keyrom[15:0]<=16'h0000;
			9'h089:		keyrom[15:0]<=16'h0000;
			9'h08a:		keyrom[15:0]<=16'h0000;
			9'h08b:		keyrom[15:0]<=16'h0000;
			9'h08c:		keyrom[15:0]<=16'h0000;
			9'h08d:		keyrom[15:0]<=16'h0000;
			9'h08e:		keyrom[15:0]<=16'h0000;
			9'h08f:		keyrom[15:0]<=16'h0000;
			9'h090:		keyrom[15:0]<=16'h0000;
			9'h091:		keyrom[15:0]<=16'h0000;
			9'h092:		keyrom[15:0]<=16'h0000;
			9'h093:		keyrom[15:0]<=16'h0000;
			9'h094:		keyrom[15:0]<=16'h0000;
			9'h095:		keyrom[15:0]<=16'h0000;
			9'h096:		keyrom[15:0]<=16'h0000;
			9'h097:		keyrom[15:0]<=16'h0000;
			9'h098:		keyrom[15:0]<=16'h0000;
			9'h099:		keyrom[15:0]<=16'h0000;
			9'h09a:		keyrom[15:0]<=16'h0000;
			9'h09b:		keyrom[15:0]<=16'h0000;
			9'h09c:		keyrom[15:0]<=16'h0000;
			9'h09d:		keyrom[15:0]<=16'h0000;
			9'h09e:		keyrom[15:0]<=16'h0000;
			9'h09f:		keyrom[15:0]<=16'h0000;
			9'h0a0:		keyrom[15:0]<=16'h0000;
			9'h0a1:		keyrom[15:0]<=16'h0000;
			9'h0a2:		keyrom[15:0]<=16'h0000;
			9'h0a3:		keyrom[15:0]<=16'h0000;
			9'h0a4:		keyrom[15:0]<=16'h0000;
			9'h0a5:		keyrom[15:0]<=16'h0000;
			9'h0a6:		keyrom[15:0]<=16'h0000;
			9'h0a7:		keyrom[15:0]<=16'h0000;
			9'h0a8:		keyrom[15:0]<=16'h0000;
			9'h0a9:		keyrom[15:0]<=16'h0000;
			9'h0aa:		keyrom[15:0]<=16'h0000;
			9'h0ab:		keyrom[15:0]<=16'h0000;
			9'h0ac:		keyrom[15:0]<=16'h0000;
			9'h0ad:		keyrom[15:0]<=16'h0000;
			9'h0ae:		keyrom[15:0]<=16'h0000;
			9'h0af:		keyrom[15:0]<=16'h0000;
			9'h0b0:		keyrom[15:0]<=16'h0000;
			9'h0b1:		keyrom[15:0]<=16'h0000;
			9'h0b2:		keyrom[15:0]<=16'h0000;
			9'h0b3:		keyrom[15:0]<=16'h0000;
			9'h0b4:		keyrom[15:0]<=16'h0000;
			9'h0b5:		keyrom[15:0]<=16'h0000;
			9'h0b6:		keyrom[15:0]<=16'h0000;
			9'h0b7:		keyrom[15:0]<=16'h0000;
			9'h0b8:		keyrom[15:0]<=16'h0000;
			9'h0b9:		keyrom[15:0]<=16'h0000;
			9'h0ba:		keyrom[15:0]<=16'h0000;
			9'h0bb:		keyrom[15:0]<=16'h0000;
			9'h0bc:		keyrom[15:0]<=16'h0000;
			9'h0bd:		keyrom[15:0]<=16'h0000;
			9'h0be:		keyrom[15:0]<=16'h0000;
			9'h0bf:		keyrom[15:0]<=16'h0000;
			9'h0c0:		keyrom[15:0]<=16'h0000;
			9'h0c1:		keyrom[15:0]<=16'h0000;
			9'h0c2:		keyrom[15:0]<=16'h0000;
			9'h0c3:		keyrom[15:0]<=16'h0000;
			9'h0c4:		keyrom[15:0]<=16'h0000;
			9'h0c5:		keyrom[15:0]<=16'h0000;
			9'h0c6:		keyrom[15:0]<=16'h0000;
			9'h0c7:		keyrom[15:0]<=16'h0000;
			9'h0c8:		keyrom[15:0]<=16'h0000;
			9'h0c9:		keyrom[15:0]<=16'h0000;
			9'h0ca:		keyrom[15:0]<=16'h0000;
			9'h0cb:		keyrom[15:0]<=16'h0000;
			9'h0cc:		keyrom[15:0]<=16'h0000;
			9'h0cd:		keyrom[15:0]<=16'h0000;