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-rw-r--r--tmk_core/common/keyboard.c58
1 files changed, 43 insertions, 15 deletions
diff --git a/tmk_core/common/keyboard.c b/tmk_core/common/keyboard.c
index eac1f1dd81..97a8f1cd8c 100644
--- a/tmk_core/common/keyboard.c
+++ b/tmk_core/common/keyboard.c
@@ -61,23 +61,51 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
# include "visualizer/visualizer.h"
#endif
+#ifdef MATRIX_HAS_GHOST
+extern const uint16_t keymaps[][MATRIX_ROWS][MATRIX_COLS];
+static matrix_row_t get_real_keys(uint8_t row, matrix_row_t rowdata){
+ matrix_row_t out = 0;
+ for (uint8_t col = 0; col < MATRIX_COLS; col++) {
+ //read each key in the row data and check if the keymap defines it as a real key
+ if (pgm_read_byte(&keymaps[0][row][col]) && (rowdata & (1<<col))){
+ //this creates new row data, if a key is defined in the keymap, it will be set here
+ out |= 1<<col;
+ }
+ }
+ return out;
+}
+static inline bool popcount_more_than_one(matrix_row_t rowdata)
+{
+ rowdata &= rowdata-1; //if there are less than two bits (keys) set, rowdata will become zero
+ return rowdata;
+}
-#ifdef MATRIX_HAS_GHOST
-static bool has_ghost_in_row(uint8_t row)
+static inline bool has_ghost_in_row(uint8_t row, matrix_row_t rowdata)
{
- 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)
+ /* 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. */
+ rowdata = get_real_keys(row, rowdata);
+ if ((popcount_more_than_one(rowdata)) == 0){
return false;
-
- // Ghost occurs when the row shares column line with other row
+ }
+ /* Ghost occurs when the row shares a column line with other row,
+ and two columns are read on each row. Blanks in the matrix don't matter,
+ so they are filtered out.
+ If there are two or more real keys pressed and they match columns with
+ at least two of another row's real keys, the row will be ignored. Keep in mind,
+ we are checking one row at a time, not all of them at once.
+ */
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
- if (i != row && (matrix_get_row(i) & matrix_row))
+ if (i != row && popcount_more_than_one(get_real_keys(i, matrix_get_row(i)) & rowdata)){
return true;
+ }
}
return false;
}
+
#endif
__attribute__ ((weak))
@@ -127,7 +155,7 @@ void keyboard_task(void)
{
static matrix_row_t matrix_prev[MATRIX_ROWS];
#ifdef MATRIX_HAS_GHOST
- static matrix_row_t matrix_ghost[MATRIX_ROWS];
+ // static matrix_row_t matrix_ghost[MATRIX_ROWS];
#endif
static uint8_t led_status = 0;
matrix_row_t matrix_row = 0;
@@ -139,18 +167,18 @@ void keyboard_task(void)
matrix_change = matrix_row ^ matrix_prev[r];
if (matrix_change) {
#ifdef MATRIX_HAS_GHOST
- if (has_ghost_in_row(r)) {
+ if (has_ghost_in_row(r, matrix_row)) {
/* Keep track of whether ghosted status has changed for
* debugging. But don't update matrix_prev until un-ghosted, or
* the last key would be lost.
*/
- if (debug_matrix && matrix_ghost[r] != matrix_row) {
- matrix_print();
- }
- matrix_ghost[r] = matrix_row;
+ //if (debug_matrix && matrix_ghost[r] != matrix_row) {
+ // matrix_print();
+ //}
+ //matrix_ghost[r] = matrix_row;
continue;
}
- matrix_ghost[r] = matrix_row;
+ //matrix_ghost[r] = matrix_row;
#endif
if (debug_matrix) matrix_print();
for (uint8_t c = 0; c < MATRIX_COLS; c++) {