1 files changed, 144 insertions, 0 deletions
diff --git a/matrix.c b/matrix.c
new file mode 100644
index 000000000..fc975a8fc
--- /dev/null
+++ b/matrix.c
@@ -0,0 +1,144 @@
+/*
+ * scan matrix
+ */
+#include <avr/io.h>
+#include <util/delay.h>
+#include "keymap.h"
+#include "matrix.h"
+#include "print.h"
+
+uint8_t *matrix;
+uint8_t *prev_matrix;
+static uint8_t _matrix0[MATRIX_ROWS];
+static uint8_t _matrix1[MATRIX_ROWS];
+
+static uint8_t read_col(void);
+static void select_row(uint8_t row);
+
+
+void matrix_init(void)
+{
+    // Column: input w/pullup
+    DDRB = 0x00;
+    PORTB = 0xFF;
+
+    // Row: Hi-Z(unselected)
+    // PD:0,1,2,3,6,7
+    // PC:6,7
+    // PF:7
+    DDRD = 0x00;
+    PORTD = 0x00;
+    DDRC = 0x00;
+    PORTC = 0x00;
+    DDRF = 0x00;
+    PORTF = 0x00;
+
+    for (int i=0; i < MATRIX_ROWS; i++) {
+        _matrix0[i] = 0xFF;
+        _matrix1[i] = 0xFF;
+    }
+    matrix = _matrix0;
+    prev_matrix = _matrix1;
+}
+
+uint8_t matrix_scan(void)
+{
+    uint8_t row, state;
+    uint8_t *tmp;
+
+    tmp = prev_matrix;
+    prev_matrix = 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();
+
+        matrix[row] = state;
+    }
+    return 1;
+}
+
+static uint8_t read_col(void)
+{
+    return PINB;
+}
+
+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  = (1<<1);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 2:
+            DDRD  = (1<<2);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 3:
+            DDRD  = (1<<3);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 4:
+            DDRD  = (1<<6);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 5:
+            DDRD  = (1<<7);
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 6:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = (1<<6);
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 7:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = (1<<7);
+            PORTC = 0x00;
+            DDRF  = 0x00;
+            PORTF = 0x00;
+            break;
+        case 8:
+            DDRD  = 0x00;
+            PORTD = 0x00;
+            DDRC  = 0x00;
+            PORTC = 0x00;
+            DDRF  = (1<<7);
+            PORTF = 0x00;
+            break;
+    }
+}