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keyboard: better handling of simultaneously pressed keys

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This commit is contained in:
Eugene Lozovoy
2024-10-04 12:59:40 +03:00
parent 23a46a3379
commit 7464a925a3
1 changed files with 52 additions and 140 deletions
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192
rtl/periph/keyboard.v
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@ -167,152 +167,64 @@ always @(posedge clk) begin
end
reg c [0:255];
always @(posedge clk or posedge reset) begin
integer i;
if (reset) begin
keys[0] <= 5'b11111;
keys[1] <= 5'b11111;
keys[2] <= 5'b11111;
keys[3] <= 5'b11111;
keys[4] <= 5'b11111;
keys[5] <= 5'b11111;
keys[6] <= 5'b11111;
keys[7] <= 5'b11111;
key_reset <= 0;
for (i = 0; i < 256; i = i + 1)
c[i] <= 1'b1;
end
else begin
if (strobe) begin
case (code[7:0])
8'h12: keys[0][0] <= ~press; // Left shift (CAPS SHIFT)
8'h59: keys[0][0] <= ~press; // Right shift (CAPS SHIFT)
8'h1a: keys[0][1] <= ~press; // Z
8'h22: keys[0][2] <= ~press; // X
8'h21: keys[0][3] <= ~press; // C
8'h2a: keys[0][4] <= ~press; // V
8'h1c: keys[1][0] <= ~press; // A
8'h1b: keys[1][1] <= ~press; // S
8'h23: keys[1][2] <= ~press; // D
8'h2b: keys[1][3] <= ~press; // F
8'h34: keys[1][4] <= ~press; // G
8'h15: keys[2][0] <= ~press; // Q
8'h1d: keys[2][1] <= ~press; // W
8'h24: keys[2][2] <= ~press; // E
8'h2d: keys[2][3] <= ~press; // R
8'h2c: keys[2][4] <= ~press; // T
8'h16: keys[3][0] <= ~press; // 1
8'h1e: keys[3][1] <= ~press; // 2
8'h26: keys[3][2] <= ~press; // 3
8'h25: keys[3][3] <= ~press; // 4
8'h2e: keys[3][4] <= ~press; // 5
8'h45: keys[4][0] <= ~press; // 0
8'h46: keys[4][1] <= ~press; // 9
8'h3e: keys[4][2] <= ~press; // 8
8'h3d: keys[4][3] <= ~press; // 7
8'h36: keys[4][4] <= ~press; // 6
8'h4d: keys[5][0] <= ~press; // P
8'h44: keys[5][1] <= ~press; // O
8'h43: keys[5][2] <= ~press; // I
8'h3c: keys[5][3] <= ~press; // U
8'h35: keys[5][4] <= ~press; // Y
8'h5a: keys[6][0] <= ~press; // ENTER
8'h4b: keys[6][1] <= ~press; // L
8'h42: keys[6][2] <= ~press; // K
8'h3b: keys[6][3] <= ~press; // J
8'h33: keys[6][4] <= ~press; // H
8'h29: keys[7][0] <= ~press; // SPACE
8'h14: keys[7][1] <= ~press; // CTRL (Symbol Shift)
8'h3a: keys[7][2] <= ~press; // M
8'h31: keys[7][3] <= ~press; // N
8'h32: keys[7][4] <= ~press; // B
// Cursor keys
8'h6b: begin
keys[0][0] <= ~press; // Left (CAPS 5)
keys[3][4] <= ~press;
end
8'h72: begin
keys[0][0] <= ~press; // Down (CAPS 6)
keys[4][4] <= ~press;
end
8'h75: begin
keys[0][0] <= ~press; // Up (CAPS 7)
keys[4][3] <= ~press;
end
8'h74: begin
keys[0][0] <= ~press; // Right (CAPS 8)
keys[4][2] <= ~press;
end
// Other special keys sent to the ULA as key combinations
8'h66: begin
keys[0][0] <= ~press; // Backspace (CAPS 0)
keys[4][0] <= ~press;
end
8'h58: begin
keys[0][0] <= ~press; // Caps lock (CAPS 2)
keys[3][1] <= ~press;
end
8'h0d: begin
keys[0][0] <= ~press; // Tab (CAPS SPACE)
keys[7][0] <= ~press;
end
8'h49: begin
keys[7][2] <= ~press; // .
keys[7][1] <= ~press;
end
8'h4e: begin
keys[6][3] <= ~press; // -
keys[7][1] <= ~press;
end
8'h0e: begin
keys[3][0] <= ~press; // ` (EDIT)
keys[0][0] <= ~press;
end
8'h41: begin
keys[7][3] <= ~press; // ,
keys[7][1] <= ~press;
end
8'h4c: begin
keys[5][1] <= ~press; // ;
keys[7][1] <= ~press;
end
8'h52: begin
keys[5][0] <= ~press; // "
keys[7][1] <= ~press;
end
8'h5d: begin
keys[0][1] <= ~press; // :
keys[7][1] <= ~press;
end
8'h55: begin
keys[6][1] <= ~press; // =
keys[7][1] <= ~press;
end
8'h54: begin
keys[4][2] <= ~press; // (
keys[7][1] <= ~press;
end
8'h5b: begin
keys[4][1] <= ~press; // )
keys[7][1] <= ~press;
end
8'h4a: begin
keys[0][3] <= ~press; // ?
keys[7][1] <= ~press;
end
8'h78: key_reset <= press;
endcase
end
else if (strobe) begin
c[code[7:0]] <= ~press;
end
end
always @* begin
key_reset <= ~c['h78];
keys[0][0] <= c['h12]&c['h6b]&c['h72]&c['h75]&c['h74]&c['h66]&c['h58]&c['h0d]&c['h0e]&c['h7d]&c['h7a]&c['h71]&c['h5d]; // CAPS SHIFT <= Lshift & Left & Down & Up & Right & Backspace & Caps & Tab & ` & PgUp & PgDn & Del & \
keys[0][1] <= c['h1a]&c['h4c]; // Z & ;
keys[0][2] <= c['h22]; // X
keys[0][3] <= c['h21]&c['h4a]; // C & ?
keys[0][4] <= c['h2a]; // V
keys[1][0] <= c['h1c]; // A
keys[1][1] <= c['h1b]; // S
keys[1][2] <= c['h23]; // D
keys[1][3] <= c['h2b]; // F
keys[1][4] <= c['h34]; // G
keys[2][0] <= c['h15]&c['h6c]; // Q & Home
keys[2][1] <= c['h1d]&c['h70]; // W & Ins
keys[2][2] <= c['h24]&c['h69]; // E
keys[2][3] <= c['h2d]; // R
keys[2][4] <= c['h2c]; // T
keys[3][0] <= c['h16]&c['h0e]; // 1 & ` (EDIT)
keys[3][1] <= c['h1e]&c['h58]; // 2 & Caps Lock
keys[3][2] <= c['h26]&c['h7d]; // 3 & PgUp
keys[3][3] <= c['h25]&c['h7a]; // 4 & PgDn
keys[3][4] <= c['h2e]&c['h6b]; // 5 & Left
keys[4][0] <= c['h45]&c['h66]; // 0 & Backspace
keys[4][1] <= c['h46]&c['h5b]&c['h71]; // 9 & ] & Del
keys[4][2] <= c['h3e]&c['h74]&c['h54]; // 8 & Right & [
keys[4][3] <= c['h3d]&c['h75]; // 7 & Up
keys[4][4] <= c['h36]&c['h72]; // 6 & Down
keys[5][0] <= c['h4d]&c['h52]; // P & "
keys[5][1] <= c['h44]; // O
keys[5][2] <= c['h43]; // I
keys[5][3] <= c['h3c]; // U
keys[5][4] <= c['h35]; // Y
keys[6][0] <= c['h5a]; // Enter
keys[6][1] <= c['h4b]; // L
keys[6][2] <= c['h42]&c['h55]; // K & +
keys[6][3] <= c['h3b]&c['h4e]; // J & -
keys[6][4] <= c['h33]; // H
keys[7][0] <= c['h29]&c['h0d]; // Space & Tab
keys[7][1] <= c['h59]&c['h49]&c['h4e]&c['h41]&c['h4c]&c['h52]&c['h5d]&c['h55]&c['h54]&c['h5b]&c['h4a]&c['h6c]&c['h69]&c['h70]; // SYMBOL SHIFT <= Rhift & . & - & , & ; & " & \ & + & ( & ) & ? & Home & End & Ins
keys[7][2] <= c['h3a]&c['h49]; // M & .
keys[7][3] <= c['h31]&c['h41]; // N & ,
keys[7][4] <= c['h32]; // B
end
reg fifo_rdreq;
wire [9:0] fifo_q;