1 files changed, 190 insertions, 0 deletions
diff --git a/keyboard/alps64/matrix.c b/keyboard/alps64/matrix.c
new file mode 100644
index 000000000..a49755c3a
--- /dev/null
+++ b/keyboard/alps64/matrix.c
@@ -0,0 +1,190 @@
+/*
+Copyright 2012 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 "debug.h"
+#include "util.h"
+#include "matrix.h"
+
+
+#ifndef DEBOUNCE
+#   define DEBOUNCE	5
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static matrix_row_t read_cols(void);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+    // initialize row and col
+    unselect_rows();
+    init_cols();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+        matrix[i] = 0;
+        matrix_debouncing[i] = 0;
+    }
+}
+
+uint8_t matrix_scan(void)
+{
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        select_row(i);
+        _delay_us(30);  // without this wait read unstable value.
+        matrix_row_t cols = read_cols();
+        if (matrix_debouncing[i] != cols) {
+            matrix_debouncing[i] = cols;
+            if (debouncing) {
+                debug("bounce!: "); debug_hex(debouncing); debug("\n");
+            }
+            debouncing = DEBOUNCE;
+        }
+        unselect_rows();
+    }
+
+    if (debouncing) {
+        if (--debouncing) {
+            _delay_ms(1);
+        } else {
+            for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+                matrix[i] = matrix_debouncing[i];
+            }
+        }
+    }
+
+    return 1;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+    print("\nr/c 0123456789ABCDEF\n");
+    for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+        phex(row); print(": ");
+        pbin_reverse16(matrix_get_row(row));
+        print("\n");
+    }
+}
+
+/* Column pin configuration
+ * col: 0   1   2   3   4   5   6   7
+ * pin: B0  B1  B2  B3  B4  B5  B6  B7
+ */
+static void  init_cols(void)
+{
+    // Input with pull-up(DDR:0, PORT:1)
+    DDRB  &= ~0b11111111;
+    PORTB |=  0b11111111;
+}
+
+/* Returns status of switches(1:on, 0:off) */
+static matrix_row_t read_cols(void)
+{
+    // Invert because PIN indicates 'switch on' with low(0) and 'off' with high(1)
+    return ~PINB;
+}
+
+/* Row pin configuration
+ * row: 0   1   2   3   4   5   6   7
+ * pin: D0  D1  D2  D3  D4  D5  D6  C2
+ */
+static void unselect_rows(void)
+{
+    // Hi-Z(DDR:0, PORT:0) to unselect
+    DDRD  &= ~0b01111111;
+    PORTD &= ~0b01111111;
+    DDRC  &= ~0b00000100;
+    PORTD &= ~0b00000100;
+}
+
+static void select_row(uint8_t row)
+{
+    // Output low(DDR:1, PORT:0) to select
+    switch (row) {
+        case 0:
+            DDRD  |= (1<<0);
+            PORTD &= ~(1<<0);
+            break;
+        case 1:
+            DDRD  |= (1<<1);
+            PORTD &= ~(1<<1);
+            break;
+        case 2:
+            DDRD  |= (1<<2);
+            PORTD &= ~(1<<2);
+            break;
+        case 3:
+            DDRD  |= (1<<3);
+            PORTD &= ~(1<<3);
+            break;
+        case 4:
+            DDRD  |= (1<<4);
+            PORTD &= ~(1<<4);
+            break;
+        case 5:
+            DDRD  |= (1<<5);
+            PORTD &= ~(1<<5);
+            break;
+        case 6:
+            DDRD  |= (1<<6);
+            PORTD &= ~(1<<6);
+            break;
+        case 7:
+            DDRC  |= (1<<2);
+            PORTC &= ~(1<<2);
+            break;
+    }
+}