mirror of
https://github.com/openstenoproject/qmk
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cd30a60d0e
Empirically, waiting for N consecutive identical scans as a debouncing strategy doesn't work very well for the ErgoDox EZ where scans are very slow compared to most keyboards. Instead, debounce the signals by eagerly reporting a change as soon as one scan observes it, but then ignoring further changes from that key for the next N scans. This is implemented by keeping an extra matrix of uint8 countdowns, such that only keys whose countdown is currently zero are eligible to change. When we do observe a change, we bump that key's countdown to DEBOUNCE. During each scan, every nonzero countdown is decremented. With this approach to debouncing, much higher debounce constants are tolerable, because latency does not increase with the constant, and debounce countdowns on one key do not interfere with events on other keys. The only negative effect of increasing the constant is that the minimum duration of a keypress increases. Perhaps I'm just extremely unlucky w.r.t. key switch quality, but I saw occasional bounces even with DEBOUNCE=10; with 15, I've seen none so far. That's around 47ms, which seems like an absolutely insane amount of time for a key to be bouncy, but at least it works.
394 lines
9.9 KiB
C
394 lines
9.9 KiB
C
/*
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Note for ErgoDox EZ customizers: Here be dragons!
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This is not a file you want to be messing with.
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All of the interesting stuff for you is under keymaps/ :)
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Love, Erez
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Copyright 2013 Oleg Kostyuk <cub.uanic@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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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include "wait.h"
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#include "action_layer.h"
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#include "ez.h"
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#include "i2cmaster.h"
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#ifdef DEBUG_MATRIX_SCAN_RATE
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#include "timer.h"
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#endif
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/*
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* This constant define not debouncing time in msecs, but amount of matrix
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* scan loops which should be made to get stable debounced results.
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*
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* On Ergodox matrix scan rate is relatively low, because of slow I2C.
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* Now it's only 317 scans/second, or about 3.15 msec/scan.
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* According to Cherry specs, debouncing time is 5 msec.
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*
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* And so, there is no sense to have DEBOUNCE higher than 2.
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*/
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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/* matrix state(1:on, 0:off) */
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static matrix_row_t matrix[MATRIX_ROWS];
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// Debouncing: store for each key the number of scans until it's eligible to
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// change. When scanning the matrix, ignore any changes in keys that have
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// already changed in the last DEBOUNCE scans.
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static uint8_t debounce_matrix[MATRIX_ROWS * MATRIX_COLS];
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static matrix_row_t read_cols(uint8_t row);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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static uint8_t mcp23018_reset_loop;
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#ifdef DEBUG_MATRIX_SCAN_RATE
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uint32_t matrix_timer;
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uint32_t matrix_scan_count;
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#endif
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__attribute__ ((weak))
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void matrix_init_user(void) {}
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__attribute__ ((weak))
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void matrix_scan_user(void) {}
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__attribute__ ((weak))
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void) {
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matrix_scan_user();
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}
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inline
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uint8_t matrix_rows(void)
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{
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return MATRIX_ROWS;
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}
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inline
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uint8_t matrix_cols(void)
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{
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return MATRIX_COLS;
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}
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void matrix_init(void)
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{
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// initialize row and col
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mcp23018_status = init_mcp23018();
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unselect_rows();
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init_cols();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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for (uint8_t j=0; j < MATRIX_COLS; ++j) {
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debounce_matrix[i * MATRIX_COLS + j] = 0;
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}
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}
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_timer = timer_read32();
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matrix_scan_count = 0;
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#endif
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matrix_init_quantum();
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}
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void matrix_power_up(void) {
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mcp23018_status = init_mcp23018();
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unselect_rows();
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init_cols();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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}
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_timer = timer_read32();
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matrix_scan_count = 0;
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#endif
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}
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// Returns a matrix_row_t whose bits are set if the corresponding key should be
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// eligible to change in this scan.
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matrix_row_t debounce_mask(uint8_t row) {
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matrix_row_t result = 0;
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for (uint8_t j=0; j < MATRIX_COLS; ++j) {
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if (debounce_matrix[row * MATRIX_COLS + j]) {
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--debounce_matrix[row * MATRIX_COLS + j];
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} else {
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result |= (1 << j);
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}
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}
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return result;
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}
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// Report changed keys in the given row. Resets the debounce countdowns
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// corresponding to each set bit in 'change' to DEBOUNCE.
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void debounce_report(matrix_row_t change, uint8_t row) {
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for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
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if (change & (1 << i)) {
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debounce_matrix[row * MATRIX_COLS + i] = DEBOUNCE;
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}
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}
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}
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uint8_t matrix_scan(void)
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{
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if (mcp23018_status) { // if there was an error
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if (++mcp23018_reset_loop == 0) {
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// since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
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// this will be approx bit more frequent than once per second
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print("trying to reset mcp23018\n");
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mcp23018_status = init_mcp23018();
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if (mcp23018_status) {
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print("left side not responding\n");
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} else {
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print("left side attached\n");
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ergodox_blink_all_leds();
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}
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}
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}
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#ifdef DEBUG_MATRIX_SCAN_RATE
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matrix_scan_count++;
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uint32_t timer_now = timer_read32();
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if (TIMER_DIFF_32(timer_now, matrix_timer)>1000) {
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print("matrix scan frequency: ");
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pdec(matrix_scan_count);
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print("\n");
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matrix_timer = timer_now;
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matrix_scan_count = 0;
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}
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#endif
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
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wait_us(30); // without this wait read unstable value.
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matrix_row_t mask = debounce_mask(i);
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matrix_row_t cols = (read_cols(i) & mask) | (matrix[i] & ~mask);
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debounce_report(cols ^ matrix[i], i);
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matrix[i] = cols;
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unselect_rows();
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}
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matrix_scan_quantum();
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return 1;
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}
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bool matrix_is_modified(void) // deprecated and evidently not called.
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{
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return true;
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}
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inline
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bool matrix_is_on(uint8_t row, uint8_t col)
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{
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return (matrix[row] & ((matrix_row_t)1<<col));
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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void matrix_print(void)
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{
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print("\nr/c 0123456789ABCDEF\n");
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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phex(row); print(": ");
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pbin_reverse16(matrix_get_row(row));
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print("\n");
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}
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}
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uint8_t matrix_key_count(void)
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{
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uint8_t count = 0;
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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count += bitpop16(matrix[i]);
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}
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return count;
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}
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/* Column pin configuration
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*
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* Teensy
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* col: 0 1 2 3 4 5
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* pin: F0 F1 F4 F5 F6 F7
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*
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* MCP23018
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* col: 0 1 2 3 4 5
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* pin: B5 B4 B3 B2 B1 B0
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*/
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static void init_cols(void)
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{
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// init on mcp23018
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// not needed, already done as part of init_mcp23018()
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// init on teensy
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// Input with pull-up(DDR:0, PORT:1)
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DDRF &= ~(1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
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PORTF |= (1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<1 | 1<<0);
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}
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static matrix_row_t read_cols(uint8_t row)
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{
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if (row < 7) {
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if (mcp23018_status) { // if there was an error
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return 0;
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} else {
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uint8_t data = 0;
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOB); if (mcp23018_status) goto out;
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mcp23018_status = i2c_start(I2C_ADDR_READ); if (mcp23018_status) goto out;
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data = i2c_readNak();
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data = ~data;
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out:
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i2c_stop();
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return data;
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}
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} else {
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// read from teensy
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return
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(PINF&(1<<0) ? 0 : (1<<0)) |
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(PINF&(1<<1) ? 0 : (1<<1)) |
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(PINF&(1<<4) ? 0 : (1<<2)) |
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(PINF&(1<<5) ? 0 : (1<<3)) |
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(PINF&(1<<6) ? 0 : (1<<4)) |
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(PINF&(1<<7) ? 0 : (1<<5)) ;
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}
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}
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/* Row pin configuration
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*
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* Teensy
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* row: 7 8 9 10 11 12 13
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* pin: B0 B1 B2 B3 D2 D3 C6
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*
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* MCP23018
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* row: 0 1 2 3 4 5 6
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* pin: A0 A1 A2 A3 A4 A5 A6
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*/
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static void unselect_rows(void)
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{
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// unselect on mcp23018
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if (mcp23018_status) { // if there was an error
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// do nothing
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} else {
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// set all rows hi-Z : 1
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write( 0xFF
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& ~(0<<7)
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); if (mcp23018_status) goto out;
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out:
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i2c_stop();
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}
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// unselect on teensy
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
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PORTB &= ~(1<<0 | 1<<1 | 1<<2 | 1<<3);
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DDRD &= ~(1<<2 | 1<<3);
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PORTD &= ~(1<<2 | 1<<3);
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DDRC &= ~(1<<6);
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PORTC &= ~(1<<6);
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}
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static void select_row(uint8_t row)
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{
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if (row < 7) {
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// select on mcp23018
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if (mcp23018_status) { // if there was an error
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// do nothing
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} else {
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// set active row low : 0
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// set other rows hi-Z : 1
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mcp23018_status = i2c_start(I2C_ADDR_WRITE); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write( 0xFF & ~(1<<row)
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& ~(0<<7)
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); if (mcp23018_status) goto out;
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out:
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i2c_stop();
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}
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} else {
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// select on teensy
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// Output low(DDR:1, PORT:0) to select
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switch (row) {
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case 7:
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DDRB |= (1<<0);
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PORTB &= ~(1<<0);
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break;
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case 8:
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DDRB |= (1<<1);
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PORTB &= ~(1<<1);
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break;
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case 9:
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DDRB |= (1<<2);
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PORTB &= ~(1<<2);
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break;
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case 10:
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DDRB |= (1<<3);
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PORTB &= ~(1<<3);
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break;
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case 11:
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DDRD |= (1<<2);
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PORTD &= ~(1<<3);
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break;
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case 12:
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DDRD |= (1<<3);
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PORTD &= ~(1<<3);
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break;
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case 13:
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DDRC |= (1<<6);
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PORTC &= ~(1<<6);
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break;
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}
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}
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}
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