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anti-ghost improvement for older keyboards with empty spots in matrix

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This commit is contained in:
Jeremiah 2017-05-13 08:51:20 -07:00
parent 4fe58aa6ec
commit 849ed5a6a0
2 changed files with 31 additions and 7 deletions
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36
tmk_core/common/keyboard.c
View file

@ -64,20 +64,41 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifdef MATRIX_HAS_GHOST
static uint16_t matrix_ghost_check[MATRIX_ROWS];
static bool has_ghost_in_row(uint8_t row)
{
matrix_row_t matrix_row = matrix_get_row(row);
// No ghost exists when less than 2 keys are down on the row
if (((matrix_row - 1) & matrix_row) == 0)
matrix_row_t matrix_row = (matrix_get_row(row) & matrix_ghost_check[row]);
/* No ghost exists when less than 2 keys are down on the row.
If there are "active" blanks in the matrix, the key can't be pressed by the user,
there is no doubt as to which keys are really being pressed.
The ghosts will be ignored, they are KC_NO. */
if (((matrix_row - 1) & matrix_row) == 0){
return false;
// Ghost occurs when the row shares column line with other row
}
// Ghost occurs when the row shares column line with other row, blanks in the matrix don't matter
// If there are more than two real keys pressed and they match another row's real keys, the row will be ignored.
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
if (i != row && (matrix_get_row(i) & matrix_row))
if (i != row && __builtin_popcount((matrix_get_row(i) & matrix_ghost_check[i]) & matrix_row) > 1){
return true;
}
}
return false;
return false;
}
extern const uint8_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
// bit map of true keys and empty spots in matrix, each row is reversed
void make_ghost_check_array(){
for (int row = 0; row < MATRIX_ROWS; row++) {
for (int col = 0; col < MATRIX_COLS; col++) {
if (keymaps[0][row][col] & 0xFF)
matrix_ghost_check[row] |= 1<<col;
else
matrix_ghost_check[row] |= 0<<col;
}
}
}
#endif
__attribute__ ((weak))
@ -117,6 +138,9 @@ void keyboard_init(void) {
#if defined(NKRO_ENABLE) && defined(FORCE_NKRO)
keymap_config.nkro = 1;
#endif
#ifdef MATRIX_HAS_GHOST
make_ghost_check_array();
#endif
}
/*

2
tmk_core/common/keyboard.h
View file

@ -57,7 +57,7 @@ static inline bool IS_RELEASED(keyevent_t event) { return (!IS_NOEVENT(event) &&
.time = (timer_read() | 1) \
}
void make_ghost_check_array(void);
/* it runs once at early stage of startup before keyboard_init. */
void keyboard_setup(void);
/* it runs once after initializing host side protocol, debug and MCU peripherals. */