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support CTRL keys; add ESC and other missing keys

This commit is contained in:
nino-porcino 2022-05-21 12:50:55 +02:00
parent 3542d776f2
commit e365dc059d
1 changed files with 55 additions and 10 deletions
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65
rtl/ps2keyboard.v
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@ -53,6 +53,7 @@ module ps2keyboard (
reg [7:0] ascii; // ASCII code of received character
reg ascii_rdy; // new ASCII character received
reg shift; // state of the shift key
reg control; // state of the control key
reg [2:0] cur_state;
reg [2:0] next_state;
@ -123,6 +124,7 @@ module ps2keyboard (
rx <= 0;
ascii_rdy <= 0;
shift <= 0;
control <= 0;
cur_state <= S_KEYNORMAL;
/*
@ -180,18 +182,52 @@ module ps2keyboard (
//end
// check for a SHIFT key
if ((rx == 8'h59) || (rx == 8'h12))
begin
if ((rx == 8'h59) || (rx == 8'h12)) begin
shift <= 1'b1;
ascii_rdy <= 1'b0; // shift is not a key!
end
else if(rx == 8'h14) begin
control <= 1'b1;
ascii_rdy <= 1'b0; // control is not a key!
end
else begin
if (!shift)
if(control) begin
case(rx)
8'h45: ascii <= 0; // ctrl+0 = NULL
8'h1C: ascii <= 1;
8'h32: ascii <= 2;
8'h21: ascii <= 3;
8'h23: ascii <= 4;
8'h24: ascii <= 5;
8'h2B: ascii <= 6;
8'h34: ascii <= 7;
8'h33: ascii <= 8;
8'h43: ascii <= 9;
8'h3B: ascii <= 10;
8'h42: ascii <= 11;
8'h4B: ascii <= 12;
8'h3A: ascii <= 13;
8'h31: ascii <= 14;
8'h44: ascii <= 15;
8'h4D: ascii <= 16;
8'h15: ascii <= 17;
8'h2D: ascii <= 18;
8'h1B: ascii <= 19;
8'h2C: ascii <= 20;
8'h3C: ascii <= 21;
8'h2A: ascii <= 22;
8'h1D: ascii <= 23;
8'h22: ascii <= 24;
8'h35: ascii <= 25;
8'h1A: ascii <= 26;
endcase
end
else if (!shift)
case(rx)
8'h05: cls_key <= 1;
8'h03: reset_key <= 1;
8'h01: poweroff_key <= 1;
8'h1C: ascii <= "A";
8'h1C: ascii <= "A"; // TODO wozmon does not handle lowercases?
8'h32: ascii <= "B";
8'h21: ascii <= "C";
8'h23: ascii <= "D";
@ -231,11 +267,16 @@ module ps2keyboard (
8'h4E: ascii <= "-";
8'h55: ascii <= "=";
8'h5D: ascii <= 8'h34; // backslash
8'h66: ascii <= 8'd8; // backspace
8'h29: ascii <= " ";
8'h29: ascii <= " ";
8'h5D: ascii <= 8'd92; // backslash
8'h66: ascii <= 8'd8; // backspace
8'h5A: ascii <= 8'd13; // enter
8'h76: ascii <= 8'd27; // esc
8'h0d: ascii <= 8'd9; // tab
8'h0e: ascii <= 8'd96; // backtick
8'h54: ascii <= "[";
8'h5B: ascii <= "]";
8'h4C: ascii <= ";";
@ -294,10 +335,14 @@ module ps2keyboard (
8'h4E: ascii <= "_";
8'h55: ascii <= "+";
8'h5D: ascii <= "|";
8'h66: ascii <= 8'd8; // backspace
8'h29: ascii <= " ";
8'h66: ascii <= 8'd8; // backspace
8'h5A: ascii <= 8'd13; // enter
8'h76: ascii <= 8'd27; // esc
8'h0d: ascii <= 8'd9; // tab
8'h0e: ascii <= "~";
8'h54: ascii <= "{";
8'h5B: ascii <= "}";
8'h4C: ascii <= ":";
@ -319,8 +364,8 @@ module ps2keyboard (
// when we end up here, a 0xF0 byte was received
// which usually means a key release event
begin
if ((rx == 8'h59) || (rx == 8'h12))
shift <= 1'b0;
if ((rx == 8'h59) || (rx == 8'h12)) shift <= 1'b0;
if (rx == 8'h14) control <= 1'b0;
next_state = S_KEYNORMAL;
cls_key <= 0;
reset_key <= 0;