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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/>.
*/
#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"
#include "matrix.h"
#define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
#define print_matrix_header() print("\nr/c 01234567\n")
#define ROW_SHIFTER ((uint8_t)1)
static void matrix_make(uint8_t code);
static void matrix_break(uint8_t code);
/*
* Matrix Array usage:
* 'Scan Code Set 3' is assigned into 17x8 cell matrix.
*
* 8bit wide
* +---------+
* 0| |
* :| | 0x00-0x87
* ;| |
* 17| |
* +---------+
*/
static uint8_t matrix[MATRIX_ROWS];
#define ROW(code) (code>>3)
#define COL(code) (code&0x07)
__attribute__ ((weak))
void matrix_init_user(void) {
}
void matrix_init(void)
{
debug_enable = true;
//debug_matrix = true;
//debug_keyboard = true;
//debug_mouse = false;
ps2_host_init();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
matrix_init_user();
return;
}
uint8_t matrix_scan(void)
{
// scan code reading states
static enum {
RESET,
RESET_RESPONSE,
KBD_ID0,
KBD_ID1,
CONFIG,
READY,
F0_BREAK,
} state = RESET;
uint8_t code;
if ((code = ps2_host_recv())) {
debug("r"); debug_hex(code); debug(" ");
}
switch (state) {
case RESET:
debug("wFF ");
if (ps2_host_send(0xFF) == 0xFA) {
debug("[ack]\nRESET_RESPONSE: ");
state = RESET_RESPONSE;
}
break;
case RESET_RESPONSE:
if (code == 0xAA) {
debug("[ok]\nKBD_ID: ");
state = KBD_ID0;
} else if (code) {
debug("err\nRESET: ");
state = RESET;
}
break;
// after reset receive keyboard ID(2 bytes)
case KBD_ID0:
if (code) {
state = KBD_ID1;
}
break;
case KBD_ID1:
if (code) {
debug("\nCONFIG: ");
state = CONFIG;
}
break;
case CONFIG:
debug("wF8 ");
if (ps2_host_send(0xF8) == 0xFA) {
debug("[ack]\nREADY\n");
state = READY;
}
break;
case READY:
switch (code) {
case 0x00:
break;
case 0xF0:
state = F0_BREAK;
debug(" ");
break;
default: // normal key make
if (code < 0x88) {
matrix_make(code);
} else {
debug("unexpected scan code at READY: "); debug_hex(code); debug("\n");
}
state = READY;
debug("\n");
}
break;
case F0_BREAK: // Break code
switch (code) {
case 0x00:
break;
default:
if (code < 0x88) {
matrix_break(code);
} else {
debug("unexpected scan code at F0: "); debug_hex(code); debug("\n");
}
state = READY;
debug("\n");
}
break;
}
return 1;
}
inline
uint8_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
inline
static void matrix_make(uint8_t code)
{
if (!matrix_is_on(ROW(code), COL(code))) {
matrix[ROW(code)] |= 1<<COL(code);
}
}
inline
static void matrix_break(uint8_t code)
{
if (matrix_is_on(ROW(code), COL(code))) {
matrix[ROW(code)] &= ~(1<<COL(code));
}
}
bool matrix_is_on(uint8_t row, uint8_t col)
{
return (matrix_get_row(row) & (1<<col));
}
void matrix_print(void)
{
#if (MATRIX_COLS <= 8)
print("r/c 01234567\n");
#elif (MATRIX_COLS <= 16)
print("r/c 0123456789ABCDEF\n");
#elif (MATRIX_COLS <= 32)
print("r/c 0123456789ABCDEF0123456789ABCDEF\n");
#endif
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
#if (MATRIX_COLS <= 8)
xprintf("%02X: %08b%s\n", row, bitrev(matrix_get_row(row)),
#elif (MATRIX_COLS <= 16)
xprintf("%02X: %016b%s\n", row, bitrev16(matrix_get_row(row)),
#elif (MATRIX_COLS <= 32)
xprintf("%02X: %032b%s\n", row, bitrev32(matrix_get_row(row)),
#endif
#ifdef MATRIX_HAS_GHOST
matrix_has_ghost_in_row(row) ? " <ghost" : ""
#else
""
#endif
);
}
}
#ifdef MATRIX_HAS_GHOST
__attribute__ ((weak))
bool matrix_has_ghost_in_row(uint8_t row)
{
matrix_row_t matrix_row = matrix_get_row(row);
// No ghost exists when less than 2 keys are down on the row
if (((matrix_row - 1) & matrix_row) == 0)
return false;
// Ghost occurs when the row shares column line with other row
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
if (i != row && (matrix_get_row(i) & matrix_row))
return true;
}
return false;
}
#endif
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