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authoralex-ong <the.onga@gmail.com>2019-01-26 17:03:46 +1100
committeralex-ong <the.onga@gmail.com>2019-01-26 17:03:46 +1100
commitd0b691df0ee74863ca54ca697aa4d4212cf401a7 (patch)
treef584ae6d23347b7256a679fd3eecd653744b6187 /quantum/debounce
parent3949ab322dcce75f470ddfbe701c8763add69e63 (diff)
DO NOT USE - debounce successfully compiled.
Diffstat (limited to 'quantum/debounce')
-rw-r--r--quantum/debounce/debounce_eager_pk.c123
-rw-r--r--quantum/debounce/debounce_sym_g.c58
-rw-r--r--quantum/debounce/readme.md28
3 files changed, 209 insertions, 0 deletions
diff --git a/quantum/debounce/debounce_eager_pk.c b/quantum/debounce/debounce_eager_pk.c
new file mode 100644
index 0000000000..e6e8bfd317
--- /dev/null
+++ b/quantum/debounce/debounce_eager_pk.c
@@ -0,0 +1,123 @@
+/*
+Copyright 2017 Alex Ong<the.onga@gmail.com>
+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
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+Basic per-key algorithm. Uses an 8-bit counter per key.
+After pressing a key, it immediately changes state, and sets a counter.
+No further inputs are accepted until DEBOUNCE milliseconds have occurred.
+*/
+
+#include "debounce.h"
+#include "matrix.h"
+#include "timer.h"
+
+#ifndef DEBOUNCE
+ #define DEBOUNCE 5
+#endif
+
+
+#if (MATRIX_COLS <= 8)
+# define ROW_SHIFTER ((uint8_t)1)
+#elif (MATRIX_COLS <= 16)
+# define ROW_SHIFTER ((uint16_t)1)
+#elif (MATRIX_COLS <= 32)
+# define ROW_SHIFTER ((uint32_t)1)
+#endif
+
+
+
+#define debounce_counter_t uint8_t
+
+static matrix_row_t matrix_debounced[MATRIX_ROWS];
+static debounce_counter_t debounce_counters[MATRIX_ROWS*MATRIX_COLS];
+
+#define DEBOUNCE_ELAPSED 251
+#define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
+
+void update_debounce_counters(uint8_t current_time);
+void transfer_matrix_values(uint8_t current_time);
+
+void matrix_debounce_init(void)
+{
+ for (uint8_t r = 0; r < MATRIX_ROWS; r++)
+ {
+ matrix_debounced[r] = 0;
+ }
+
+ int i = 0;
+ for (uint8_t r = 0; r < MATRIX_ROWS; r++)
+ {
+ for (uint8_t c = 0; c < MATRIX_COLS; c++)
+ {
+ debounce_counters[i++] = DEBOUNCE_ELAPSED;
+ }
+ }
+}
+
+void matrix_debounce(void)
+{
+ uint8_t current_time = timer_read() % MAX_DEBOUNCE;
+ update_debounce_counters(current_time);
+ transfer_matrix_values(current_time);
+}
+
+//If the current time is > debounce counter, set the counter to enable input.
+void update_debounce_counters(uint8_t current_time)
+{
+ debounce_counter_t *debounce_pointer = debounce_counters;
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++)
+ {
+ for (uint8_t col = 0; col < MATRIX_COLS; col++)
+ {
+ if (*debounce_pointer != DEBOUNCE_ELAPSED)
+ {
+ if (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >=
+ DEBOUNCING_DELAY) {
+ *debounce_pointer = DEBOUNCE_ELAPSED;
+ }
+ }
+ debounce_pointer++;
+ }
+ }
+}
+
+// upload from raw_matrix to final matrix;
+void transfer_matrix_values(uint8_t current_time)
+{
+ debounce_counter_t *debounce_pointer = debounce_counters;
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++)
+ {
+ matrix_row_t existing_row = matrix_debounced[row];
+ matrix_row_t raw_row = matrix_get_row(row);
+
+ for (uint8_t col = 0; col < MATRIX_COLS; col++)
+ {
+ matrix_row_t col_mask = (ROW_SHIFTER << col);
+ bool final_value = raw_row & col_mask;
+ bool existing_value = existing_row & col_mask;
+ if (*debounce_pointer == DEBOUNCE_ELAPSED &&
+ (existing_value != final_value))
+ {
+ *debounce_pointer = current_time;
+ existing_row ^= col_mask; //flip the bit.
+ }
+ debounce_pointer++;
+ }
+ matrix_debounced[row] = existing_row;
+ }
+}
+
+
+
+//Implementation of no debounce.
diff --git a/quantum/debounce/debounce_sym_g.c b/quantum/debounce/debounce_sym_g.c
new file mode 100644
index 0000000000..c206f28647
--- /dev/null
+++ b/quantum/debounce/debounce_sym_g.c
@@ -0,0 +1,58 @@
+/*
+Copyright 2017 Alex Ong<the.onga@gmail.com>
+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
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
+When no state changes have occured for DEBOUNCE milliseconds, we push the state.
+*/
+#include "debounce.h"
+#include "matrix.h"
+#include "timer.h"
+#ifndef DEBOUNCE
+ #define DEBOUNCE 5
+#endif
+
+static bool debouncing = false;
+static uint16_t debouncing_time;
+
+void debounce_init(void) {}
+
+#if DEBOUNCE > 0
+void debounce(matrix_row_t raw[], matrix_row_t cooked[], bool changed)
+{
+ if (changed) {
+ debouncing = true;
+ debouncing_time = timer_read();
+ }
+
+ if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
+ for (int i = 0; i < MATRIX_ROWS; i++) {
+ cooked[i] = raw[i];
+ }
+ debouncing = false;
+ }
+}
+#else //no debouncing.
+void debounce(matrix_row_t raw[], matrix_row_t cooked[], bool changed)
+{
+ for (int i = 0; i < MATRIX_ROWS; i++) {
+ cooked[i] = raw[i];
+ }
+}
+#endif
+
+bool debounce_active() {
+ return debouncing;
+}
+
diff --git a/quantum/debounce/readme.md b/quantum/debounce/readme.md
new file mode 100644
index 0000000000..1a77d44df5
--- /dev/null
+++ b/quantum/debounce/readme.md
@@ -0,0 +1,28 @@
+Debounce algorithms belong in this folder.
+Here are a few ideas
+
+1) Global vs Per-Key vs Per-Row
+ * Global - one timer for all keys. Any key change state affects global timer
+ * Per key - one timer per key
+ * Per row - one timer per row
+
+2) Eager vs symmetric vs assymetric
+ * Eager - any key change is reported immediately. All further inputs for DEBOUNCE ms are ignored.
+ * Symmetric - wait for no changes for DEBOUNCE ms before reporting change
+ * Assymetric - wait for different times depending on key-down/key-up. E.g. Eager key-down, DEBOUNCE ms key up.
+
+3) Timestamp vs cycles
+ * old old old code waits n cycles, decreasing count by one each matrix_scan
+ * newer code stores the millisecond the change occurred, and does subraction to figure out time elapsed.
+ * Timestamps are superior, i don't think cycles will ever be used again once upgraded.
+
+The default algorithm is symmetric and global.
+Here are a few that could be implemented:
+
+debounce_sym_g.c
+debounce_sym_pk.c
+debounce_sym_pr.c
+debounce_sym_pr_cycles.c //currently used in ergo-dox
+debounce_eager_g.c
+debounce_eager_pk.c
+debounce_eager_pr.c //could be used in ergo-dox!