Henry-Hiles/qmk_userspace
1
0
Fork 0
forked from mirrors/qmk_userspace
Code Pull requests Activity

add anti-ghost logic

Browse source
This commit is contained in:
tmk 2010-09-13 00:00:58 +09:00
parent 3b31337cd8
commit 82309deefc
4 changed files with 114 additions and 63 deletions
Download patch file Download diff file Expand all files Collapse all files

78
matrix.c
View file

@ -7,38 +7,36 @@
#include "matrix.h"
#include "print.h"
// matrix is active low. (key on: 0/key off: 1)
// row: Hi-Z(unselected)/low output(selected)
// PD:0,1,2,3,6,7/PC:6,7/PF:7
// col: input w/pullup
// PB:0-8
// 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)
@ -46,25 +44,65 @@ 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) {