Debounce refactor / API (#3720)
* Added xeal60 via clone of lets split * Delete removed other keymaps * Basic keymap (no FN). Compiles. * Removed NP_STAR and NP_SLSH. * Removed "debounce_algo = manual" in all keyboards with CUSTOM_MATRIX = yes. * Changed order of rules in TMK. Documented feature. * Fixed missing whitespace in debounce documentation Table wasn't working due to missing newline. * Added bold in a few areas. * DO NOT USE - Removed debounce from TMK. * Remove accidental xeal60 commit * DO NOT USE - debounce successfully compiled. * DO NOT USE Revert back to original API to support split_keyboards. * Working eager_pk * Whitespace cleanup. * Restored debounce.h since there wasnt any real change. * Moved debouncing_time variable to inside #if debounce * Removed check for custom_matrix. We can safely include the debounce file for compilation when custom_matrix is used. * Removed #include "matrix.h" from debounce.h * Bug fix - was using MATRIX_ROWS instead of num_rows * Fixed compilation error with debounce_sym_g * Renamed DEBOUNCE_ALGO to DEBOUNCE_TYPE * Malloc array in debounce_eager_pk, since split keyboards only use MATRIX_ROWS/2. * Fix compile error in debounce_eager_pk * Stricter, leaner DEBOUNCE_TYPE section in common_features.mk. Cleanup debounce_type.mkpull/5134/head 0.6.280
Drashna Jaelre
7 years ago
committed by
GitHub
commit
c22f3ba3a2
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# Debounce algorithm
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QMK supports multiple debounce algorithms through its debounce API.
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The underlying debounce algorithm is determined by which matrix.c file you are using.
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The logic for which debounce method called is below. It checks various defines that you have set in rules.mk
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```
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DEBOUNCE_TYPE?= sym_g
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VALID_DEBOUNCE_TYPES := sym_g eager_pk custom
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ifeq ($(filter $(DEBOUNCE_TYPE),$(VALID_DEBOUNCE_TYPES)),)
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$(error DEBOUNCE_TYPE="$(DEBOUNCE_TYPE)" is not a valid debounce algorithm)
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endif
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ifeq ($(strip $(DEBOUNCE_TYPE)), sym_g)
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QUANTUM_SRC += $(DEBOUNCE_DIR)/debounce_sym_g.c
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else ifeq ($(strip $(DEBOUNCE_TYPE)), eager_pk)
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QUANTUM_SRC += $(DEBOUNCE_DIR)/debounce_eager_pk.c
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endif
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```
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# Debounce selection
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| DEBOUNCE_ALGO | Description | What to do |
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| ------------- | --------------------------------------------------- | ----------------------------- |
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| Not defined | You are using the included matrix.c and debounce.c | Nothing. Debounce_sym_g will be compiled, and used if necessary |
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| custom | Use your own debounce.c | ```SRC += debounce.c``` add your own debounce.c and implement necessary functions |
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| sym_g / eager_pk | You are using the included matrix.c and debounce.c | Use an alternative debounce algorithm |
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**Regarding split keyboards**:
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The debounce code is compatible with split keyboards.
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# Use your own debouncing code
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* Set ```DEBOUNCE_TYPE = custom ```.
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* Add ```SRC += debounce.c```
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* Add your own ```debounce.c```. Look at included ```debounce_sym_g.c```s for sample implementations.
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* Debouncing occurs after every raw matrix scan.
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* Use num_rows rather than MATRIX_ROWS, so that split keyboards are supported correctly.
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# Changing between included debouncing methods
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You can either use your own code, by including your own debounce.c, or switch to another included one.
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Included debounce methods are:
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* debounce_eager_pk - debouncing per key. On any state change, response is immediate, followed by ```DEBOUNCE_DELAY``` millseconds of no further input for that key
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* debounce_sym_g - debouncing per keyboard. On any state change, a global timer is set. When ```DEBOUNCE_DELAY``` milliseconds of no changes has occured, all input changes are pushed.
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@ -1,52 +0,0 @@
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#include "matrix.h"
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#include "timer.h"
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#include "quantum.h"
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#ifndef DEBOUNCING_DELAY
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# define DEBOUNCING_DELAY 5
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#endif
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void debounce_init(uint8_t num_rows) {
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}
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#if DEBOUNCING_DELAY > 0
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static bool debouncing = false;
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void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
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static uint16_t debouncing_time;
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if (changed) {
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debouncing = true;
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debouncing_time = timer_read();
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}
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if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCING_DELAY)) {
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for (uint8_t i = 0; i < num_rows; i++) {
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cooked[i] = raw[i];
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}
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debouncing = false;
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}
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}
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bool debounce_active(void) {
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return debouncing;
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}
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#else
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// no debounce
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void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed) {
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if (changed)
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{
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for (uint8_t i = 0; i < num_rows; i++) {
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cooked[i] = raw[i];
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}
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}
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}
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bool debounce_active(void) {
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return false;
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}
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#endif
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@ -0,0 +1,121 @@
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/*
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Copyright 2017 Alex Ong<the.onga@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Basic per-key algorithm. Uses an 8-bit counter per key.
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After pressing a key, it immediately changes state, and sets a counter.
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No further inputs are accepted until DEBOUNCE milliseconds have occurred.
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*/
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#include "matrix.h"
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#include "timer.h"
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#include "quantum.h"
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#include <stdlib.h>
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#ifndef DEBOUNCE
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#define DEBOUNCE 5
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#endif
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#if (MATRIX_COLS <= 8)
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# define ROW_SHIFTER ((uint8_t)1)
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#elif (MATRIX_COLS <= 16)
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# define ROW_SHIFTER ((uint16_t)1)
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#elif (MATRIX_COLS <= 32)
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# define ROW_SHIFTER ((uint32_t)1)
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#endif
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#define debounce_counter_t uint8_t
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static debounce_counter_t *debounce_counters;
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#define DEBOUNCE_ELAPSED 251
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#define MAX_DEBOUNCE (DEBOUNCE_ELAPSED - 1)
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void update_debounce_counters(uint8_t num_rows, uint8_t current_time);
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void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time);
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//we use num_rows rather than MATRIX_ROWS to support split keyboards
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void debounce_init(uint8_t num_rows)
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{
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debounce_counters = (debounce_counter_t*)malloc(num_rows*MATRIX_COLS * sizeof(debounce_counter_t));
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int i = 0;
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for (uint8_t r = 0; r < num_rows; r++)
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{
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for (uint8_t c = 0; c < MATRIX_COLS; c++)
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{
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debounce_counters[i++] = DEBOUNCE_ELAPSED;
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}
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}
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}
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void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed)
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{
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uint8_t current_time = timer_read() % MAX_DEBOUNCE;
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update_debounce_counters(num_rows, current_time);
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transfer_matrix_values(raw, cooked, num_rows, current_time);
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}
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//If the current time is > debounce counter, set the counter to enable input.
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void update_debounce_counters(uint8_t num_rows, uint8_t current_time)
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{
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debounce_counter_t *debounce_pointer = debounce_counters;
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for (uint8_t row = 0; row < num_rows; row++)
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{
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for (uint8_t col = 0; col < MATRIX_COLS; col++)
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{
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if (*debounce_pointer != DEBOUNCE_ELAPSED)
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{
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if (TIMER_DIFF(current_time, *debounce_pointer, MAX_DEBOUNCE) >= DEBOUNCE) {
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*debounce_pointer = DEBOUNCE_ELAPSED;
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}
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}
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debounce_pointer++;
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}
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}
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}
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// upload from raw_matrix to final matrix;
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void transfer_matrix_values(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, uint8_t current_time)
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{
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debounce_counter_t *debounce_pointer = debounce_counters;
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for (uint8_t row = 0; row < num_rows; row++)
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{
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matrix_row_t existing_row = cooked[row];
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matrix_row_t raw_row = raw[row];
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for (uint8_t col = 0; col < MATRIX_COLS; col++)
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{
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matrix_row_t col_mask = (ROW_SHIFTER << col);
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bool final_value = raw_row & col_mask;
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bool existing_value = existing_row & col_mask;
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if (*debounce_pointer == DEBOUNCE_ELAPSED &&
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(existing_value != final_value))
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{
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*debounce_pointer = current_time;
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existing_row ^= col_mask; //flip the bit.
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}
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debounce_pointer++;
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}
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cooked[row] = existing_row;
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}
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}
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bool debounce_active(void)
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{
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return true;
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}
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@ -0,0 +1,57 @@
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/*
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Copyright 2017 Alex Ong<the.onga@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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Basic global debounce algorithm. Used in 99% of keyboards at time of implementation
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When no state changes have occured for DEBOUNCE milliseconds, we push the state.
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*/
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#include "matrix.h"
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#include "timer.h"
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#include "quantum.h"
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#ifndef DEBOUNCE
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#define DEBOUNCE 5
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#endif
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void debounce_init(uint8_t num_rows) {}
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static bool debouncing = false;
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#if DEBOUNCE > 0
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static uint16_t debouncing_time;
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void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed)
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{
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if (changed) {
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debouncing = true;
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debouncing_time = timer_read();
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}
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if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
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for (int i = 0; i < num_rows; i++) {
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cooked[i] = raw[i];
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}
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debouncing = false;
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}
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}
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#else //no debouncing.
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void debounce(matrix_row_t raw[], matrix_row_t cooked[], uint8_t num_rows, bool changed)
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{
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for (int i = 0; i < num_rows; i++) {
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cooked[i] = raw[i];
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}
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}
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#endif
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bool debounce_active(void) {
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return debouncing;
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}
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@ -0,0 +1,28 @@
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Debounce algorithms belong in this folder.
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Here are a few ideas
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1) Global vs Per-Key vs Per-Row
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* Global - one timer for all keys. Any key change state affects global timer
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* Per key - one timer per key
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* Per row - one timer per row
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2) Eager vs symmetric vs assymetric
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* Eager - any key change is reported immediately. All further inputs for DEBOUNCE ms are ignored.
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* Symmetric - wait for no changes for DEBOUNCE ms before reporting change
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* Assymetric - wait for different times depending on key-down/key-up. E.g. Eager key-down, DEBOUNCE ms key up.
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3) Timestamp vs cycles
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* old old old code waits n cycles, decreasing count by one each matrix_scan
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* newer code stores the millisecond the change occurred, and does subraction to figure out time elapsed.
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* Timestamps are superior, i don't think cycles will ever be used again once upgraded.
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The default algorithm is symmetric and global.
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Here are a few that could be implemented:
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debounce_sym_g.c
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debounce_sym_pk.c
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debounce_sym_pr.c
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debounce_sym_pr_cycles.c //currently used in ergo-dox
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debounce_eager_g.c
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debounce_eager_pk.c
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debounce_eager_pr.c //could be used in ergo-dox!
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