452 lines
13 KiB
C
452 lines
13 KiB
C
/*
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Copyright 2011 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "util.h"
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#include "debug.h"
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#include "ps2.h"
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#include "matrix.h"
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static void matrix_make(uint8_t code);
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static void matrix_break(uint8_t code);
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#ifdef MATRIX_HAS_GHOST
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static bool matrix_has_ghost_in_row(uint8_t row);
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#endif
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/*
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* Matrix Array usage:
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* 'Scan Code Set 2' is assigned into 256(32x8)cell matrix.
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* Hmm, it is very sparse and not efficient :(
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*
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* Notes:
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* Both 'Hanguel/English'(F1) and 'Hanja'(F2) collide with 'Delete'(E0 71) and 'Down'(E0 72).
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* These two Korean keys need exceptional handling and are not supported for now. Sorry.
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*
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* 8bit wide
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* +---------+
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* 0| |
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* :| XX | 00-7F for normal codes(without E0-prefix)
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* f|_________|
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* 10| |
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* :| E0 YY | 80-FF for E0-prefixed codes
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* 1f| | (<YY>|0x80) is used as matrix position.
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* +---------+
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*
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* Exceptions:
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* 0x83: F7(0x83) This is a normal code but beyond 0x7F.
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* 0xFC: PrintScreen
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* 0xFE: Pause
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*/
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static uint8_t matrix[MATRIX_ROWS];
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#define ROW(code) (code>>3)
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#define COL(code) (code&0x07)
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// matrix positions for exceptional keys
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#define F7 (0x83)
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#define PRINT_SCREEN (0xFC)
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#define PAUSE (0xFE)
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static bool is_modified = false;
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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ps2_host_init();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
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return;
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}
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/*
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* PS/2 Scan Code Set 2: Exceptional Handling
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*
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* There are several keys to be handled exceptionally.
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* The scan code for these keys are varied or prefix/postfix'd
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* depending on modifier key state.
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*
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* Keyboard Scan Code Specification:
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* http://www.microsoft.com/whdc/archive/scancode.mspx
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* http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc
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*
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*
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* 1) Insert, Delete, Home, End, PageUp, PageDown, Up, Down, Right, Left
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* a) when Num Lock is off
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Ohter | <make> | <break>
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* LShift | E0 F0 12 <make> | <break> E0 12
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* RShift | E0 F0 59 <make> | <break> E0 59
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* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
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*
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* b) when Num Lock is on
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Other | E0 12 <make> | <break> E0 F0 12
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* Shift'd | <make> | <break>
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*
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* Handling: These prefix/postfix codes are ignored.
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*
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*
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* 2) Keypad /
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* modifiers | make | break
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* ----------+---------------------------+----------------------
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* Ohter | <make> | <break>
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* LShift | E0 F0 12 <make> | <break> E0 12
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* RShift | E0 F0 59 <make> | <break> E0 59
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* L+RShift | E0 F0 12 E0 F0 59 <make> | <break> E0 59 E0 12
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*
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* Handling: These prefix/postfix codes are ignored.
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*
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*
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* 3) PrintScreen
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* modifiers | make | break
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* ----------+--------------+-----------------------------------
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* Other | E0 12 E0 7C | E0 F0 7C E0 F0 12
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* Shift'd | E0 7C | E0 F0 7C
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* Control'd | E0 7C | E0 F0 7C
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* Alt'd | 84 | F0 84
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*
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* Handling: These prefix/postfix codes are ignored, and both scan codes
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* 'E0 7C' and 84 are seen as PrintScreen.
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*
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* 4) Pause
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* modifiers | make(no break code)
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* ----------+--------------------------------------------------
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* Other | E1 14 77 E1 F0 14 F0 77
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* Control'd | E0 7E E0 F0 7E
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*
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* Handling: Both code sequences are treated as a whole.
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* And we need a ad hoc 'pseudo break code' hack to get the key off
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* because it has no break code.
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*
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*/
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uint8_t matrix_scan(void)
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{
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// scan code reading states
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static enum {
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INIT,
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F0,
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E0,
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E0_F0,
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// Pause
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E1,
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E1_14,
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E1_14_77,
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E1_14_77_E1,
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E1_14_77_E1_F0,
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E1_14_77_E1_F0_14,
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E1_14_77_E1_F0_14_F0,
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// Control'd Pause
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E0_7E,
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E0_7E_E0,
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E0_7E_E0_F0,
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} state = INIT;
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is_modified = false;
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// 'pseudo break code' hack
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if (matrix_is_on(ROW(PAUSE), COL(PAUSE))) {
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matrix_break(PAUSE);
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}
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uint8_t code;
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while ((code = ps2_host_recv())) {
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switch (state) {
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case INIT:
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switch (code) {
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case 0xE0:
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state = E0;
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break;
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case 0xF0:
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state = F0;
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break;
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case 0xE1:
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state = E1;
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break;
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case 0x83: // F7
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matrix_make(F7);
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state = INIT;
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break;
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case 0x84: // Alt'd PrintScreen
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matrix_make(PRINT_SCREEN);
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state = INIT;
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break;
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default: // normal key make
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if (code < 0x80) {
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matrix_make(code);
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} else {
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debug("unexpected scan code at INIT: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case E0: // E0-Prefixed
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switch (code) {
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case 0x12: // to be ignored
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case 0x59: // to be ignored
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state = INIT;
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break;
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case 0x7E: // Control'd Pause
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state = E0_7E;
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break;
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case 0xF0:
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state = E0_F0;
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break;
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default:
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if (code < 0x80) {
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matrix_make(code|0x80);
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} else {
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debug("unexpected scan code at E0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case F0: // Break code
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switch (code) {
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case 0x83: // F7
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matrix_break(F7);
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state = INIT;
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break;
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case 0x84: // Alt'd PrintScreen
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matrix_break(PRINT_SCREEN);
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state = INIT;
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break;
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default:
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if (code < 0x80) {
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matrix_break(code);
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} else {
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debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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case E0_F0: // Break code of E0-prefixed
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switch (code) {
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case 0x12: // to be ignored
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case 0x59: // to be ignored
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state = INIT;
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break;
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default:
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if (code < 0x80) {
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matrix_break(code|0x80);
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} else {
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debug("unexpected scan code at E0_F0: "); debug_hex(code); debug("\n");
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}
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state = INIT;
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}
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break;
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// following are states of Pause
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case E1:
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switch (code) {
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case 0x14:
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state = E1_14;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14:
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switch (code) {
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case 0x77:
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state = E1_14_77;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77:
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switch (code) {
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case 0xE1:
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state = E1_14_77_E1;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1:
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switch (code) {
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case 0xF0:
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state = E1_14_77_E1_F0;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0:
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switch (code) {
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case 0x14:
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state = E1_14_77_E1_F0_14;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0_14:
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switch (code) {
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case 0xF0:
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state = E1_14_77_E1_F0_14_F0;
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break;
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default:
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state = INIT;
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}
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break;
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case E1_14_77_E1_F0_14_F0:
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switch (code) {
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case 0x77:
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matrix_make(PAUSE);
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state = INIT;
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break;
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default:
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state = INIT;
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}
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break;
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// Following are states of Control'd Pause
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case E0_7E:
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if (code == 0xE0)
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state = E0_7E_E0;
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else
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state = INIT;
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break;
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case E0_7E_E0:
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if (code == 0xF0)
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state = E0_7E_E0_F0;
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else
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state = INIT;
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break;
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case E0_7E_E0_F0:
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if (code == 0x7E)
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matrix_make(PAUSE);
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state = INIT;
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break;
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default:
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state = INIT;
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}
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phex(code);
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}
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return 1;
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}
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bool matrix_is_modified(void)
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{
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return is_modified;
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}
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inline
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bool matrix_has_ghost(void)
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{
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#ifdef MATRIX_HAS_GHOST
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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if (matrix_has_ghost_in_row(i))
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return true;
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}
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#endif
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return false;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & (1<<col));
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}
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inline
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uint8_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 01234567\n");
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for (uint8_t row = 0; row < matrix_rows(); row++) {
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phex(row); print(": ");
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pbin_reverse(matrix_get_row(row));
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#ifdef MATRIX_HAS_GHOST
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if (matrix_has_ghost_in_row(row)) {
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print(" <ghost");
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}
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#endif
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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count += bitpop(matrix[i]);
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}
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return count;
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}
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#ifdef MATRIX_HAS_GHOST
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inline
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static bool matrix_has_ghost_in_row(uint8_t row)
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{
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// no ghost exists in case less than 2 keys on
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if (((matrix[row] - 1) & matrix[row]) == 0)
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return false;
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// ghost exists in case same state as other row
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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if (i != row && (matrix[i] & matrix[row]) == matrix[row])
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return true;
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}
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return false;
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}
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#endif
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inline
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static void matrix_make(uint8_t code)
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{
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if (!matrix_is_on(ROW(code), COL(code))) {
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matrix[ROW(code)] |= 1<<COL(code);
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is_modified = true;
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}
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}
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inline
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static void matrix_break(uint8_t code)
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{
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if (matrix_is_on(ROW(code), COL(code))) {
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matrix[ROW(code)] &= ~(1<<COL(code));
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is_modified = true;
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}
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}
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