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authorSimon Arlott <70171+nomis@users.noreply.github.com>2021-06-09 08:23:21 +0100
committerGitHub <noreply@github.com>2021-06-09 17:23:21 +1000
commitb829a1d2648abd0751e9d3505554547faf643425 (patch)
tree35ba811a62feffd88759d0a53c1d6353d5d6d88a /tmk_core/common/avr
parentf287597c19dc926c7c28cefa32ffc3f0b4fdba7f (diff)
Avoid 8-bit timer overflows in debounce algorithms (#12240)
* Add fast_timer_t that is 16-bit or 32-bit based on architecture A 16-bit timer will overflow sooner but be faster to compare on AVR. * Avoid 8-bit timer overflows in debounce algorithms Count down remaining elapsed time instead of trying to do 8-bit timer comparisons. Add a "none" implementation that is automatically used if DEBOUNCE is 0 otherwise it will break the _pk/_pr count down. * Avoid unnecessary polling of the entire matrix in sym_eager_pk The matrix only needs to be updated when a debounce timer expires. * Avoid unnecessary polling of the entire matrix in sym_eager_pr The matrix only needs to be updated when a debounce timer expires. The use of the "needed_update" variable is trying to do what "matrix_need_update" was added to fix but didn't work because it only applied when all keys finished debouncing. * Fix sym_defer_g timing inconsistency compared to other debounce algorithms DEBOUNCE=5 should process the key after 5ms, not 6ms * Add debounce tests
Diffstat (limited to 'tmk_core/common/avr')
-rw-r--r--tmk_core/common/avr/_timer.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/tmk_core/common/avr/_timer.h b/tmk_core/common/avr/_timer.h
new file mode 100644
index 0000000000..b81e0f68b7
--- /dev/null
+++ b/tmk_core/common/avr/_timer.h
@@ -0,0 +1,19 @@
+/* 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
+ * (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/>.
+ */
+#pragma once
+
+// The platform is 8-bit, so prefer 16-bit timers to reduce code size
+#define FAST_TIMER_T_SIZE 16