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-rw-r--r--quantum/debounce/sym_eager_pr.c76
1 files changed, 49 insertions, 27 deletions
diff --git a/quantum/debounce/sym_eager_pr.c b/quantum/debounce/sym_eager_pr.c
index 20ccb46f1d..2ad592c5a6 100644
--- a/quantum/debounce/sym_eager_pr.c
+++ b/quantum/debounce/sym_eager_pr.c
@@ -1,5 +1,6 @@
/*
Copyright 2019 Alex Ong<the.onga@gmail.com>
+Copyright 2021 Simon Arlott
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
@@ -33,27 +34,25 @@ No further inputs are accepted until DEBOUNCE milliseconds have occurred.
# define DEBOUNCE 5
#endif
-#define debounce_counter_t uint8_t
+// Maximum debounce: 255ms
+#if DEBOUNCE > UINT8_MAX
+# undef DEBOUNCE
+# define DEBOUNCE UINT8_MAX
+#endif
+
+typedef uint8_t debounce_counter_t;
+
+#if DEBOUNCE > 0
static bool matrix_need_update;
static debounce_counter_t *debounce_counters;
+static fast_timer_t last_time;
static bool counters_need_update;
-#define DEBOUNCE_ELAPSED 251
-#define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
-
-static uint8_t wrapping_timer_read(void) {
- static uint16_t time = 0;
- static uint8_t last_result = 0;
- uint16_t new_time = timer_read();
- uint16_t diff = new_time - time;
- time = new_time;
- last_result = (last_result + diff) % (MAX_DEBOUNCE + 1);
- return last_result;
-}
+#define DEBOUNCE_ELAPSED 0
-void update_debounce_counters(uint8_t num_rows, uint8_t current_time);
-void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
+static void update_debounce_counters(uint8_t num_rows, uint8_t elapsed_time);
+static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows);
// we use num_rows rather than MATRIX_ROWS to support split keyboards
void debounce_init(uint8_t num_rows) {
@@ -63,27 +62,50 @@ void debounce_init(uint8_t num_rows) {
}
}
+void debounce_free(void) {
+ free(debounce_counters);
+ debounce_counters = NULL;
+}
+
void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
- uint8_t current_time = wrapping_timer_read();
- bool needed_update = counters_need_update;
+ bool updated_last = false;
+
if (counters_need_update) {
- update_debounce_counters(num_rows, current_time);
+ fast_timer_t now = timer_read_fast();
+ fast_timer_t elapsed_time = TIMER_DIFF_FAST(now, last_time);
+
+ last_time = now;
+ updated_last = true;
+ if (elapsed_time > UINT8_MAX) {
+ elapsed_time = UINT8_MAX;
+ }
+
+ if (elapsed_time > 0) {
+ update_debounce_counters(num_rows, elapsed_time);
+ }
}
- if (changed || (needed_update && !counters_need_update) || matrix_need_update) {
- transfer_matrix_values(raw, cooked, num_rows, current_time);
+ if (changed || matrix_need_update) {
+ if (!updated_last) {
+ last_time = timer_read_fast();
+ }
+
+ transfer_matrix_values(raw, cooked, num_rows);
}
}
// If the current time is > debounce counter, set the counter to enable input.
-void update_debounce_counters(uint8_t num_rows, uint8_t current_time) {
+static void update_debounce_counters(uint8_t num_rows, uint8_t elapsed_time) {
counters_need_update = false;
+ matrix_need_update = false;
debounce_counter_t *debounce_pointer = debounce_counters;
for (uint8_t row = 0; row < num_rows; row++) {
if (*debounce_pointer != DEBOUNCE_ELAPSED) {
- if (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >= DEBOUNCE) {
+ if (*debounce_pointer <= elapsed_time) {
*debounce_pointer = DEBOUNCE_ELAPSED;
+ matrix_need_update = true;
} else {
+ *debounce_pointer -= elapsed_time;
counters_need_update = true;
}
}
@@ -92,8 +114,7 @@ void update_debounce_counters(uint8_t num_rows, uint8_t current_time) {
}
// upload from raw_matrix to final matrix;
-void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time) {
- matrix_need_update = false;
+static void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows) {
debounce_counter_t *debounce_pointer = debounce_counters;
for (uint8_t row = 0; row < num_rows; row++) {
matrix_row_t existing_row = cooked[row];
@@ -102,11 +123,9 @@ void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t n
// determine new value basd on debounce pointer + raw value
if (existing_row != raw_row) {
if (*debounce_pointer == DEBOUNCE_ELAPSED) {
- *debounce_pointer = current_time;
+ *debounce_pointer = DEBOUNCE;
cooked[row] = raw_row;
counters_need_update = true;
- } else {
- matrix_need_update = true;
}
}
debounce_pointer++;
@@ -114,3 +133,6 @@ void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t n
}
bool debounce_active(void) { return true; }
+#else
+# include "none.c"
+#endif