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authortmk <nobody@nowhere>2010-10-14 17:36:00 +0900
committertmk <nobody@nowhere>2010-10-15 11:09:57 +0900
commit54b5bafaacf0d7863b7bdb84dd69cbc80db77956 (patch)
tree38cf278aebedf9c35bf09c418d2b9d09bc611257 /macway/matrix.c
parent82637ded2737bfd80a2c1b85c0a9ae0b6fd33bd7 (diff)
add directories for each keyboard: hhkb, macway
Diffstat (limited to 'macway/matrix.c')
-rw-r--r--macway/matrix.c181
1 files changed, 181 insertions, 0 deletions
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;
+ }
+}