313 lines
8.3 KiB
C
313 lines
8.3 KiB
C
/*
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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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#include "matrix.h"
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#include "wait.h"
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#include "debug.h"
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#include "util.h"
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#include "ergotaco.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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// ATmega pin defs
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#define ROW1 (1<<5)
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#define COL6 (1<<0)
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#define COL7 (1<<1)
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#define COL8 (1<<2)
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#define COL9 (1<<3)
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#define COL10 (1<<2)
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#define COL11 (1<<3)
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// bit masks
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#define BMASK (COL7 | COL8 | COL9 | COL6)
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#define DMASK (COL10 | COL11)
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#define FMASK (ROW1)
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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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/*
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* matrix state(1:on, 0:off)
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* contains the raw values without debounce filtering of the last read cycle.
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*/
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static matrix_row_t raw_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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// static uint16_t mcp23018_reset_loop;
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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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raw_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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matrix_init_kb();
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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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}
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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(matrix_row_t rawcols, uint8_t row) {
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matrix_row_t result = 0;
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matrix_row_t change = rawcols ^ raw_matrix[row];
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raw_matrix[row] = rawcols;
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for (uint8_t i = 0; i < MATRIX_COLS; ++i) {
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if (debounce_matrix[row * MATRIX_COLS + i]) {
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--debounce_matrix[row * MATRIX_COLS + i];
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} else {
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result |= (1 << i);
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}
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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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return result;
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}
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matrix_row_t debounce_read_cols(uint8_t row) {
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// Read the row without debouncing filtering and store it for later usage.
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matrix_row_t cols = read_cols(row);
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// Get the Debounce mask.
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matrix_row_t mask = debounce_mask(cols, row);
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// debounce the row and return the result.
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return (cols & mask) | (matrix[row] & ~mask);;
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}
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uint8_t matrix_scan(void)
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{
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// Then the keyboard
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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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// if (++mcp23018_reset_loop >= 1300) {
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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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for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
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select_row(i);
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// and select on left hand
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select_row(i + MATRIX_ROWS_PER_SIDE);
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// we don't need a 30us delay anymore, because selecting a
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// left-hand row requires more than 30us for i2c.
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// grab cols from left hand
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matrix[i] = debounce_read_cols(i);
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// grab cols from right hand
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matrix[i + MATRIX_ROWS_PER_SIDE] = debounce_read_cols(i + MATRIX_ROWS_PER_SIDE);
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unselect_rows();
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}
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matrix_scan_kb();
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#ifdef DEBUG_MATRIX
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for (uint8_t c = 0; c < MATRIX_COLS; c++)
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for (uint8_t r = 0; r < MATRIX_ROWS; r++)
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if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
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#endif
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return 1;
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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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print_hex8(row); print(": ");
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print_bin_reverse16(matrix_get_row(row));
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print("\n");
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}
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}
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// Remember this means ROWS
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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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// Input with pull-up(DDR:0, PORT:1)
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DDRF &= ~FMASK;
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PORTF |= FMASK;
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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, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOB, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_start(I2C_ADDR_READ, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_read_nack(ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status < 0) goto out;
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data = (~((uint8_t)mcp23018_status) >> 2) & 0x01 ;
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mcp23018_status = I2C_STATUS_SUCCESS;
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out:
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i2c_stop();
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#ifdef DEBUG_MATRIX
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if (data != 0x00) xprintf("I2C: %d\n", data);
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#endif
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return data;
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}
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} else {
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// Read using bitmask
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return ~((((PINF & ROW1) >> 5)) & 0x1);
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}
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}
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// Row pin configuration
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static void unselect_rows(void)
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{
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// no need to unselect on mcp23018, because the select step sets all
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// the other row bits high, and it's not changing to a different
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// direction
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRB &= ~BMASK;
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PORTB &= ~BMASK;
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DDRD &= ~DMASK;
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PORTD &= ~DMASK;
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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) { // do nothing on error
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// Read using bitmask
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} else { // set active row low : 0 // set other rows hi-Z : 1
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mcp23018_status = i2c_start(I2C_ADDR_WRITE, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA, ERGODOX_EZ_I2C_TIMEOUT); if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(~(1<<row), ERGODOX_EZ_I2C_TIMEOUT); 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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// 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 |= COL6;
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PORTB &= ~COL6;
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break;
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case 7:
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DDRB |= COL7;
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PORTB &= ~COL7;
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break;
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case 8:
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DDRB |= COL8;
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PORTB &= ~COL8;
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break;
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case 9:
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DDRB |= COL9;
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PORTB &= ~COL9;
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break;
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case 10:
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DDRD |= COL10;
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PORTD &= ~COL10;
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break;
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case 11:
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DDRD |= COL11;
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PORTD &= ~COL11;
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break;
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}
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}
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}
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