qmk-dactyl-manuform-a/ps2_usb/matrix.c

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