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mcleod_ide |
`timescale 1ns / 1ps
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//////////////////////////////////////////////////////////////////////////////////
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// Company: Dept. Architecture and Computing Technology. University of Seville
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// Engineer: Miguel Angel Rodriguez Jodar. rodriguj@atc.us.es
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//
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// Create Date: 19:13:39 4-Apr-2012
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// Design Name: ZX Spectrum
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// Module Name: PS2 keyboard interface for ZX Spectrum.
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// Project Name:
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// Target Devices:
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// Tool versions:
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// Description:
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//
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// Dependencies:
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//
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// Revision:
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// Revision 1.00 - File Created
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// Additional Comments: GPL License policies apply to the contents of this file.
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//
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//////////////////////////////////////////////////////////////////////////////////
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module ps2kbd (
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input clk,
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input reset,
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input clkps2,
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input dataps2,
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output ledextended,
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output ledreleased,
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output ledmayus,
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output [7:0] scancode,
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input [7:0] semifila,
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output [4:0] columna
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);
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reg rload = 0;
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reg [1:0] estado = 0;
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wire [7:0] tecla;
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wire recibida;
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reg [7:0] rscancode=8'h00;
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assign scancode = rscancode;
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reg extended = 0;
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reg released = 0;
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reg mayus = 0;
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assign ledextended = extended;
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assign ledreleased = released;
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assign ledmayus = mayus;
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ps2_keyboard ps2_get_scancode (
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.clk(clk),
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.reset(reset),
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.ps2_clk(clkps2),
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.ps2_data(dataps2),
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.interrupt(recibida),
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.rx_scan_code(tecla)
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);
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matrix scancode_to_zx_keyboard (
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.clk(clk),
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.keyreceived(rload),
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.scancode(tecla),
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.mayus(mayus),
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.extended(extended),
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.released(released),
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.semifila(semifila),
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.columna(columna)
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);
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always @(posedge clk)
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begin
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case (estado)
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0: if (recibida) // if a new key has just been received at the PS2 port...
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begin
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if (tecla==8'h12 || tecla==8'h59) begin // if it's one of the two shift keys,
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mayus <= 1; // signal it.
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end
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else if (tecla==8'hE0) begin // if this is the beginning of an extended key
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extended <= 1; // signal it...
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released <= 0; // (this is not a released key)
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estado <= 1; // ...and wait for the next code
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end
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else if (tecla==8'hF0) begin // if this is the beginning of a released key
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extended <= 0; // then it's not an extended key
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released <= 1; // signal it...
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estado <= 2; // ... and wait for the next code
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end
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else if (tecla!=8'hE0 && tecla!=8'hF0 && tecla!=8'h12 && tecla!=8'h59) begin // if this is a "normal" key
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rscancode <= tecla; // store its scancode
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extended <= 0; //
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released <= 0; // signal it as "normal": not released, not extended
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rload <= 1; //no estaba // a new key has arrived. Signal that to the matrix module
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estado <= 0; //3; // and go for another key (the next clock will have "recibida" = 0, so
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end // it will go to the "else" part of this "if" statement, to deassert "rload")
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end
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else
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rload <= 0; // if a new key has not been received, just turn off the "new key arrived" signal
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1: if (recibida) // if a new extended key has just been received at the PS2 port...
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begin
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if (tecla==8'hF0) begin // if this is the beginning of a released extended key...
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released <= 1; // ... signal it, and
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estado <= 2; // ... wait for the actual scancode of the released key
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end
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else if (tecla!=8'hE0 && tecla!=8'hF0 && tecla!=8'h12 && tecla!=8'h59) begin // if this is the actual scancode of a new pressed extended key...
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rscancode <= tecla; // store it...
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rload <= 1; //no estaba // assert "rload"...
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estado <= 0; //3; // and go for another key...
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end
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end
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else
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rload <= 0;
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2: if (recibida) // if a new released key has just been received at the PS2 port...
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begin
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if (tecla==8'h12 || tecla==8'h59) begin // if it is one of the shift keys
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mayus <= 0; // deassert "mayus" to signal that shift is no longer pressed
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estado <= 0;
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end
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else if (tecla!=8'hE0 && tecla!=8'hF0 && tecla!=8'h12 && tecla!=8'h59) begin // if this is any other key...
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rscancode <= tecla; // store it...
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rload <= 1; // assert "rload"
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estado <= 0; // and go for another key
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end
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end
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else
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rload <= 0;
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endcase
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end
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endmodule
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module matrix (
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input clk,
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input keyreceived,
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input [7:0] scancode,
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input mayus,
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input extended,
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input released,
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input [7:0] semifila,
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output [4:0] columna
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);
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reg [4:0] thematrix[0:7]; // memory representing 40 keys
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initial begin // initially, all keys are released (0=pressed)
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thematrix[0] = 5'b11111;
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thematrix[1] = 5'b11111;
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thematrix[2] = 5'b11111;
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thematrix[3] = 5'b11111;
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thematrix[4] = 5'b11111;
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thematrix[5] = 5'b11111;
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thematrix[6] = 5'b11111;
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thematrix[7] = 5'b11111;
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end
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// output bits to ULA are composed with data from the eight half-rows, depending upon which
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// bits were resetted at CPU address bus bits 8-15 (row selection)
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assign columna = ((!semifila[0])? thematrix[0] : 5'b11111) &
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((!semifila[1])? thematrix[1] : 5'b11111) &
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((!semifila[2])? thematrix[2] : 5'b11111) &
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((!semifila[3])? thematrix[3] : 5'b11111) &
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((!semifila[4])? thematrix[4] : 5'b11111) &
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((!semifila[5])? thematrix[5] : 5'b11111) &
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((!semifila[6])? thematrix[6] : 5'b11111) &
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((!semifila[7])? thematrix[7] : 5'b11111);
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// ROM's containing the ZX Spectrum equivalent key(s) for each PS2 key. For Spectrum shifted keys
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// (such as = * + ! CURSOR-LEFT, DELETE, EDIT, etc), a memory location contains two values: one of
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// them is either CAPS SHIFT or SYMBOL SHIFT. The other one is the key that would have to be pressed along
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// with the shift key on the ZX Spectrum keyboard.
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// These ROM's are filled in the file "mapa_es.inc". This file contains the mapping for a spanish keyboard.
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// There is a ROM for normal PS2 keys, another one for PS2 shifted keys, another one for extended, non shifted
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// keys, and the last one is for extended shifted keys.
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// Cada posicion tiene: CODSEMIFILA1(3) , VALORSEMIFILA1(5) , CODSEMIFILA1(3) , VALORSEMIFILA1(5)
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// These ROM's will be infered as BLOCK RAM because the address will be registered
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reg [15:0] mapa_noshift_noext[0:131];
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reg [15:0] mapa_shift_noext[0:131];
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reg [15:0] mapa_noshift_ext[0:131];
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reg [15:0] mapa_shift_ext[0:131];
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`include "mapa_es.inc"
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reg [2:0] row_key1_nosh_noex;
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reg [2:0] row_key2_nosh_noex;
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reg [2:0] row_key1_sh_noex;
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reg [2:0] row_key2_sh_noex;
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reg [2:0] row_key1_nosh_ex;
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reg [2:0] row_key2_nosh_ex;
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reg [2:0] row_key1_sh_ex;
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reg [2:0] row_key2_sh_ex;
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reg [4:0] col_key1_nosh_noex;
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reg [4:0] col_key2_nosh_noex;
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reg [4:0] col_key1_sh_noex;
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reg [4:0] col_key2_sh_noex;
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reg [4:0] col_key1_nosh_ex;
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reg [4:0] col_key2_nosh_ex;
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reg [4:0] col_key1_sh_ex;
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reg [4:0] col_key2_sh_ex;
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reg [7:0] addrmap; // to make the addr registered, so XST will infer block RAM.
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reg [4:0] matrixstate = 0;
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always @(posedge clk) begin
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case (matrixstate)
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if (keyreceived) begin // wait until a key is received.
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matrixstate <= 1;
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addrmap <= scancode;
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end
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end
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1 : begin // paralell read the same in the four possible combinations
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{row_key1_nosh_noex,
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col_key1_nosh_noex,
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row_key2_nosh_noex,
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col_key2_nosh_noex} <= mapa_noshift_noext[addrmap];
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{row_key1_sh_noex,
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col_key1_sh_noex,
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row_key2_sh_noex,
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col_key2_sh_noex} <= mapa_shift_noext[addrmap];
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{row_key1_nosh_ex,
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col_key1_nosh_ex,
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row_key2_nosh_ex,
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col_key2_nosh_ex} <= mapa_noshift_ext[addrmap];
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{row_key1_sh_ex,
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col_key1_sh_ex,
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row_key2_sh_ex,
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col_key2_sh_ex} <= mapa_shift_ext[addrmap];
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matrixstate <= 3;
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end
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3 : begin // apply matrix updates according to the actual combination pressed or released
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case ( {mayus,extended,released} )
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3'b000 : matrixstate <= 4; //non shifted, non extended, key pressed
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3'b001 : matrixstate <= 6; //non shifted, non extended, key released
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3'b010 : matrixstate <= 10; //non shifted, extended...
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3'b011 : matrixstate <= 12; //
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3'b100 : matrixstate <= 16; //shifted, non extended...
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3'b101 : matrixstate <= 18; //
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3'b110 : matrixstate <= 20; //shifted, extended...
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3'b111 : matrixstate <= 22; //
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default : matrixstate <= 0;
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endcase
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end
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4 : begin // non shifted, non extended, key pressed, update key1 status
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thematrix[row_key1_nosh_noex] <= thematrix[row_key1_nosh_noex] & col_key1_nosh_noex;
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matrixstate <= 5;
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end
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5 : begin // update key2 status
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thematrix[row_key2_nosh_noex] <= thematrix[row_key2_nosh_noex] & col_key2_nosh_noex;
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matrixstate <= 0; // go for another key
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end
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6 : begin // non shifted, non extended, key released...
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thematrix[row_key1_nosh_noex] <= thematrix[row_key1_nosh_noex] | ~col_key1_nosh_noex;
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matrixstate <= 7;
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end
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7 : begin
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thematrix[row_key2_nosh_noex] <= thematrix[row_key2_nosh_noex] | ~col_key2_nosh_noex;
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matrixstate <= 8;
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end
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8 : begin // when a non shifted key releases, it released shifted version too...
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thematrix[row_key1_sh_noex] <= thematrix[row_key1_sh_noex] | ~col_key1_sh_noex;
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matrixstate <= 9;
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end
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9 : begin
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thematrix[row_key2_sh_noex] <= thematrix[row_key2_sh_noex] | ~col_key2_sh_noex;
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matrixstate <= 0;
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end
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10: begin // non shifted, extended, key pressed...
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thematrix[row_key1_nosh_ex] <= thematrix[row_key1_nosh_ex] & col_key1_nosh_ex;
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matrixstate <= 11;
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end
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11: begin
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thematrix[row_key2_nosh_ex] <= thematrix[row_key2_nosh_ex] & col_key2_nosh_ex;
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matrixstate <= 0; // go for another key
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end
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12: begin // non shifted, extended, key released...
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thematrix[row_key1_nosh_ex] <= thematrix[row_key1_nosh_ex] | ~col_key1_nosh_ex;
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matrixstate <= 13;
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end
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13: begin
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thematrix[row_key2_nosh_ex] <= thematrix[row_key2_nosh_ex] | ~col_key2_nosh_ex;
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matrixstate <= 14;
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end
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14: begin // when a non shifted key releases, it released shifted version too...
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thematrix[row_key1_sh_ex] <= thematrix[row_key1_sh_ex] | ~col_key1_sh_ex;
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matrixstate <= 15;
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end
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15: begin
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thematrix[row_key2_sh_ex] <= thematrix[row_key2_sh_ex] | ~col_key2_sh_ex;
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matrixstate <= 0;
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end
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16: begin // shifted, non extended, key pressed, update key1 status
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thematrix[row_key1_sh_noex] <= thematrix[row_key1_sh_noex] & col_key1_sh_noex;
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matrixstate <= 17;
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end
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17: begin // update key2 status
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thematrix[row_key2_sh_noex] <= thematrix[row_key2_sh_noex] & col_key2_sh_noex;
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matrixstate <= 0; // go for another key
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end
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| 303 |
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|
|
| 304 |
|
|
18: begin // shifted, non extended, key released...
|
| 305 |
|
|
thematrix[row_key1_sh_noex] <= thematrix[row_key1_sh_noex] | ~col_key1_sh_noex;
|
| 306 |
|
|
matrixstate <= 19;
|
| 307 |
|
|
end
|
| 308 |
|
|
19: begin
|
| 309 |
|
|
thematrix[row_key2_sh_noex] <= thematrix[row_key2_sh_noex] | ~col_key2_sh_noex;
|
| 310 |
|
|
matrixstate <= 0;
|
| 311 |
|
|
end
|
| 312 |
|
|
|
| 313 |
|
|
20: begin // shifted, extended, key pressed, update key1 status
|
| 314 |
|
|
thematrix[row_key1_sh_ex] <= thematrix[row_key1_sh_ex] & col_key1_sh_ex;
|
| 315 |
|
|
matrixstate <= 21;
|
| 316 |
|
|
end
|
| 317 |
|
|
21: begin // update key2 status
|
| 318 |
|
|
thematrix[row_key2_sh_ex] <= thematrix[row_key2_sh_ex] & col_key2_sh_ex;
|
| 319 |
|
|
matrixstate <= 0; // go for another key
|
| 320 |
|
|
end
|
| 321 |
|
|
|
| 322 |
|
|
22: begin // shifted, extended, key released...
|
| 323 |
|
|
thematrix[row_key1_sh_ex] <= thematrix[row_key1_sh_ex] | ~col_key1_sh_ex;
|
| 324 |
|
|
matrixstate <= 23;
|
| 325 |
|
|
end
|
| 326 |
|
|
23: begin
|
| 327 |
|
|
thematrix[row_key2_sh_ex] <= thematrix[row_key2_sh_ex] | ~col_key2_sh_ex;
|
| 328 |
|
|
matrixstate <= 0;
|
| 329 |
|
|
end
|
| 330 |
|
|
endcase
|
| 331 |
|
|
end
|
| 332 |
|
|
endmodule
|
| 333 |
|
|
|
| 334 |
|
|
|
