+// Returns a matrix_row_t whose bits are set if the corresponding key should be
+// eligible to change in this scan.
+matrix_row_t debounce_mask(uint8_t row) {
+ matrix_row_t result = 0;
+ for (uint8_t j=0; j < MATRIX_COLS; ++j) {
+ if (debounce_matrix[row * MATRIX_COLS + j]) {
+ --debounce_matrix[row * MATRIX_COLS + j];
+ } else {
+ result |= (1 << j);
+ }
+ }
+ return result;
+}
+
+// Report changed keys in the given row. Resets the debounce countdowns
+// corresponding to each set bit in 'change' to DEBOUNCE.
+void debounce_report(matrix_row_t change, uint8_t row) {
+ for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
+ if (change & (1 << i)) {
+ debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
+ }
+ }