diff options
Diffstat (limited to 'tmk_core/common/keyboard.c')
| -rw-r--r-- | tmk_core/common/keyboard.c | 36 |
1 files changed, 30 insertions, 6 deletions
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c index eac1f1dd81..93a066e574 100644 --- a/tmk_core/common/keyboard.c +++ b/tmk_core/common/keyboard.c @@ -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 } /* |