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-rw-r--r--m0110_usb/matrix.c193
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diff --git a/m0110_usb/matrix.c b/m0110_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/>.
+*/
+
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "util.h"
+#include "debug.h"
+#include "host.h"
+#include "led.h"
+#include "m0110.h"
+#include "matrix.h"
+
+
+#define CAPS 0x39
+#define CAPS_UP (CAPS | 0x80)
+#define ROW(key) ((key)>>3&0x0F)
+#define COL(key) ((key)&0x07)
+
+
+static bool is_modified = false;
+
+// matrix state buffer(1:on, 0:off)
+static uint8_t *matrix;
+static uint8_t _matrix0[MATRIX_ROWS];
+
+#ifdef MATRIX_HAS_GHOST
+static bool matrix_has_ghost_in_row(uint8_t row);
+#endif
+static void register_key(uint8_t key);
+
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+ print_enable = true;
+ debug_enable = true;
+ debug_matrix = false;
+ debug_keyboard = false;
+ debug_mouse = false;
+ print("debug enabled.\n");
+
+ m0110_init();
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
+ matrix = _matrix0;
+ return;
+}
+
+uint8_t matrix_scan(void)
+{
+ uint8_t key;
+
+ is_modified = false;
+ key = m0110_recv_key();
+
+#ifdef MATRIX_HAS_LOCKING_CAPS
+ // Send Caps key up event
+ if (matrix_is_on(ROW(CAPS), COL(CAPS))) {
+ is_modified = true;
+ register_key(CAPS_UP);
+ }
+#endif
+ if (key == M0110_NULL) {
+ return 0;
+ } else {
+#ifdef MATRIX_HAS_LOCKING_CAPS
+ if (host_keyboard_leds() & (1<<USB_LED_CAPS_LOCK)) {
+ // CAPS LOCK on:
+ // Ignore LockingCaps key down event
+ if (key == CAPS) return 0;
+ // Convert LockingCaps key up event into down event
+ if (key == CAPS_UP) key = CAPS;
+ } else {
+ // CAPS LOCK off:
+ // Ignore LockingCaps key up event
+ if (key == CAPS_UP) return 0;
+ }
+#endif
+ is_modified = true;
+ register_key(key);
+ }
+
+ if (debug_enable) {
+ print("key: "); phex(key); print("\n");
+ }
+ return 1;
+}
+
+bool matrix_is_modified(void)
+{
+ return is_modified;
+}
+
+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));
+ 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 register_key(uint8_t key)
+{
+ if (key&0x80) {
+ matrix[ROW(key)] &= ~(1<<COL(key));
+ } else {
+ matrix[ROW(key)] |= (1<<COL(key));
+ }
+}