394 lines
9.7 KiB
C
394 lines
9.7 KiB
C
/*
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Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
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Copyright 2017 Erin Call <hello@erincall.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 "dactyl.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 the Dactyl, the matrix scan rate is relatively low, because
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* communicating with the left hand's I/O expander is slower than simply
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* selecting local pins.
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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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}
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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 < 6) {
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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: 6 7 8 9 10 11
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* pin: 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
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* pin: A0 A1 A2 A3 A4 A5
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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); 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<<1 | 1<<2 | 1<<3);
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PORTB &= ~(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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/* Row pin configuration
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*
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* Teensy
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* row: 6 7 8 9 10 11
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* pin: 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
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* pin: A0 A1 A2 A3 A4 A5
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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 < 6) {
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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)); 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 6:
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DDRB |= (1<<1);
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PORTB &= ~(1<<1);
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break;
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case 7:
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DDRB |= (1<<2);
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PORTB &= ~(1<<2);
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break;
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case 8:
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DDRB |= (1<<3);
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PORTB &= ~(1<<3);
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break;
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case 9:
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DDRD |= (1<<2);
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PORTD &= ~(1<<3);
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break;
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case 10:
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DDRD |= (1<<3);
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PORTD &= ~(1<<3);
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break;
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case 11:
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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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