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Diffstat (limited to 'keyboards/ergodox_ez/matrix.c')
-rw-r--r--keyboards/ergodox_ez/matrix.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/keyboards/ergodox_ez/matrix.c b/keyboards/ergodox_ez/matrix.c
index 97f764113b..6f604ae2b9 100644
--- a/keyboards/ergodox_ez/matrix.c
+++ b/keyboards/ergodox_ez/matrix.c
@@ -123,6 +123,17 @@ void matrix_power_up(void) {
#endif
}
+// Reads and stores a row, returning
+// whether a change occurred.
+static inline bool store_raw_matrix_row(uint8_t index) {
+ matrix_row_t temp = read_cols(index);
+ if (raw_matrix[index] != temp) {
+ raw_matrix[index] = temp;
+ return true;
+ }
+ return false;
+}
+
uint8_t matrix_scan(void) {
if (mcp23018_status) { // if there was an error
if (++mcp23018_reset_loop == 0) {
@@ -157,22 +168,24 @@ uint8_t matrix_scan(void) {
#ifdef LEFT_LEDS
mcp23018_status = ergodox_left_leds_update();
#endif // LEFT_LEDS
+ bool changed = false;
for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
// select rows from left and right hands
- select_row(i);
- select_row(i + MATRIX_ROWS_PER_SIDE);
+ uint8_t left_index = i;
+ uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
+ select_row(left_index);
+ select_row(right_index);
// we don't need a 30us delay anymore, because selecting a
// left-hand row requires more than 30us for i2c.
-
- // grab left + right cols.
- raw_matrix[i] = read_cols(i);
- raw_matrix[i+MATRIX_ROWS_PER_SIDE] = read_cols(i+MATRIX_ROWS_PER_SIDE);
+ changed |= store_raw_matrix_row(left_index);
+ changed |= store_raw_matrix_row(right_index);
+
unselect_rows();
}
- debounce(raw_matrix, matrix, MATRIX_ROWS, true);
+ debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
matrix_scan_quantum();
return 1;