#include <util/delay.h>
#include "keymap.h"
#include "matrix.h"
-#include "print.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 *prev_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)
{
- // Column: input w/pullup
+ // initialize row and col
+ unselect_rows();
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;
- }
+ // 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;
- prev_matrix = _matrix1;
+ matrix_prev = _matrix1;
}
uint8_t matrix_scan(void)
uint8_t row, state;
uint8_t *tmp;
- tmp = prev_matrix;
- prev_matrix = matrix;
+ 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) {
PORTF = 0x00;
break;
case 1:
- DDRD = (1<<1);
+ DDRD = 0x00;
PORTD = 0x00;
- DDRC = 0x00;
+ DDRC = (1<<7);
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
break;
case 2:
- DDRD = (1<<2);
+ DDRD = (1<<7);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
PORTF = 0x00;
break;
case 3:
- DDRD = (1<<3);
+ DDRD = 0x00;
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
- DDRF = 0x00;
+ DDRF = (1<<6);
PORTF = 0x00;
break;
case 4:
PORTF = 0x00;
break;
case 5:
- DDRD = (1<<7);
+ DDRD = (1<<1);
PORTD = 0x00;
DDRC = 0x00;
PORTC = 0x00;
PORTF = 0x00;
break;
case 6:
- DDRD = 0x00;
+ DDRD = (1<<2);
PORTD = 0x00;
- DDRC = (1<<6);
+ DDRC = 0x00;
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;
case 7:
DDRD = 0x00;
PORTD = 0x00;
- DDRC = (1<<7);
+ DDRC = (1<<6);
PORTC = 0x00;
DDRF = 0x00;
PORTF = 0x00;