From 54b5bafaacf0d7863b7bdb84dd69cbc80db77956 Mon Sep 17 00:00:00 2001
From: tmk <nobody@nowhere>
Date: Thu, 14 Oct 2010 17:36:00 +0900
Subject: add directories for each keyboard: hhkb, macway

---
 macway/matrix.c | 181 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 181 insertions(+)
 create mode 100644 macway/matrix.c

(limited to 'macway/matrix.c')

diff --git a/macway/matrix.c b/macway/matrix.c
new file mode 100644
index 0000000000..cb52d79c30
--- /dev/null
+++ b/macway/matrix.c
@@ -0,0 +1,181 @@
+/*
+ * scan matrix
+ */
+#include <avr/io.h>
+#include <util/delay.h>
+#include "keymap.h"
+#include "matrix.h"
+
+// matrix is active low. (key on: 0/key off: 1)
+// row: Hi-Z(unselected)/low output(selected)
+//      PD0, PC7, PD7, PF6, PD6, PD1, PD2, PC6, PF7
+// col: input w/pullup
+//      PB0-PB7
+
+// matrix state buffer
+uint8_t *matrix;
+uint8_t *matrix_prev;
+static uint8_t _matrix0[MATRIX_ROWS];
+static uint8_t _matrix1[MATRIX_ROWS];
+
+static uint8_t read_col(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+
+// this must be called once before matrix_scan.
+void matrix_init(void)
+{
+    // initialize row and col
+    unselect_rows();
+    DDRB = 0x00;
+    PORTB = 0xFF;
+
+    // initialize matrix state: all keys off
+    for (int i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0xFF;
+    for (int i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0xFF;
+    matrix = _matrix0;
+    matrix_prev = _matrix1;
+}
+
+uint8_t matrix_scan(void)
+{
+    uint8_t row, state;
+    uint8_t *tmp;
+
+    tmp = matrix_prev;
+    matrix_prev = matrix;
+    matrix = tmp;
+
+    for (row = 0; row < MATRIX_ROWS; row++) {
+        select_row(row);
+        _delay_us(30);  // without this wait read unstable value.
+        state = read_col();
+        unselect_rows();
+
+        matrix[row] = state;
+    }
+    return 1;
+}
+
+bool matrix_is_modified(void) {
+    for (int i=0; i <MATRIX_ROWS; i++) {
+        if (matrix[i] != matrix_prev[i])
+            return true;
+    }
+    return false;
+}
+
+bool matrix_has_ghost(void) {
+    for (int i=0; i <MATRIX_ROWS; i++) {
+        if (matrix_has_ghost_in_row(i))
+            return true;
+    }
+    return false;
+}
+
+bool matrix_has_ghost_in_row(uint8_t row) {
+    uint8_t state = ~matrix[row];
+    // no ghost exists in case less than 2 keys on
+    if (((state - 1) & state) == 0)
+        return false;
+
+    // ghost exists in case same state as other row
+    for (int i=0; i < MATRIX_ROWS; i++) {
+        if (i == row) continue;
+        if ((~matrix[i] & state) == state) return true;
+    }
+    return false;
+}
+
+static uint8_t read_col(void)
+{
+    return PINB;
+}
+
+static void unselect_rows(void) {
+    DDRD  = 0x00;
+    PORTD = 0x00;
+    DDRC  = 0x00;
+    PORTC = 0x00;
+    DDRF  = 0x00;
+    PORTF = 0x00;
+}
+
+static void select_row(uint8_t row)
+{
+    switch (row) {
+        case 0:
+            DDRD  = (1<<0);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 1:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = (1<<7);
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 2:
+            DDRD  = (1<<7);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 3:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = (1<<6);
+            PORTF = 0x00;
+            break;
+        case 4:
+            DDRD  = (1<<6);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 5:
+            DDRD  = (1<<1);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 6:
+            DDRD  = (1<<2);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 7:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = (1<<6);
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 8:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = (1<<7);
+            PORTF = 0x00;
+            break;
+    }
+}
-- 
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