510 lines
16 KiB
C
510 lines
16 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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#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 "i2c_master.h"
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#include "timer.h"
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#define I2C_TIMEOUT 100
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#define I2C_ADDR 0b0100000
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#define I2C_ADDR_WRITE ( (I2C_ADDR<<1) | I2C_WRITE )
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#define I2C_ADDR_READ ( (I2C_ADDR<<1) | I2C_READ )
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#define IODIRA 0x00 // i/o direction register
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#define IODIRB 0x01
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#define GPPUA 0x0C // GPIO pull-up resistor register
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#define GPPUB 0x0D
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#define GPIOA 0x12 // general purpose i/o port register (write modifies OLAT)
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#define GPIOB 0x13
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void init_expander(void);
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/* Set 0 if debouncing isn't needed */
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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#if (DEBOUNCE > 0)
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static uint16_t debouncing_time;
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static bool debouncing = false;
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#endif
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#ifdef MATRIX_MASKED
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extern const matrix_row_t matrix_mask[];
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#endif
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#if (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
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static const uint8_t onboard_row_pins[MATRIX_ROWS] = MATRIX_ONBOARD_ROW_PINS;
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static const uint8_t onboard_col_pins[MATRIX_COLS] = MATRIX_ONBOARD_COL_PINS;
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static const bool col_expanded[MATRIX_COLS] = COL_EXPANDED;
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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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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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#if (DIODE_DIRECTION == COL2ROW)
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static const uint8_t expander_col_pins[MATRIX_COLS] = MATRIX_EXPANDER_COL_PINS;
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static void init_cols(void);
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row);
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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 void unselect_row(uint8_t row);
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#elif (DIODE_DIRECTION == ROW2COL)
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static const uint8_t expander_row_pins[MATRIX_ROWS] = MATRIX_EXPANDER_ROW_PINS;
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static void init_rows(void);
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
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static void unselect_cols(void);
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static void select_col(uint8_t col);
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static void unselect_col(uint8_t col);
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#endif
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static uint8_t expander_reset_loop;
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uint8_t expander_status;
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uint8_t expander_input_pin_mask;
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bool i2c_initialized = false;
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#define ROW_SHIFTER ((matrix_row_t)1)
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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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init_expander();
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#if (DIODE_DIRECTION == COL2ROW)
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unselect_rows();
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init_cols();
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#elif (DIODE_DIRECTION == ROW2COL)
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unselect_cols();
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init_rows();
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#endif
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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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matrix_debouncing[i] = 0;
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}
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matrix_init_kb();
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}
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void init_expander(void) {
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if (! i2c_initialized) {
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i2c_init();
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wait_ms(1000);
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}
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if (! expander_input_pin_mask) {
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#if (DIODE_DIRECTION == COL2ROW)
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for (int col = 0; col < MATRIX_COLS; col++) {
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if (col_expanded[col]) {
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expander_input_pin_mask |= (1 << expander_col_pins[col]);
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}
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}
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#elif (DIODE_DIRECTION == ROW2COL)
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for (int row = 0; row < MATRIX_ROWS; row++) {
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expander_input_pin_mask |= (1 << expander_row_pins[row]);
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}
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#endif
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}
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expander_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(IODIRA, I2C_TIMEOUT); if (expander_status) goto out;
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/*
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Pin direction and pull-up depends on both the diode direction
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and on whether the column register is GPIOA or GPIOB
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+-------+---------------+---------------+
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| | ROW2COL | COL2ROW |
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+-------+---------------+---------------+
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| GPIOA | input, output | output, input |
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+-------+---------------+---------------+
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| GPIOB | output, input | input, output |
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+-------+---------------+---------------+
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*/
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#if (EXPANDER_COL_REGISTER == GPIOA)
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# if (DIODE_DIRECTION == COL2ROW)
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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# elif (DIODE_DIRECTION == ROW2COL)
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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# endif
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#elif (EXPANDER_COL_REGISTER == GPIOB)
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# if (DIODE_DIRECTION == COL2ROW)
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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# elif (DIODE_DIRECTION == ROW2COL)
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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# endif
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#endif
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i2c_stop();
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// set pull-up
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// - unused : off : 0
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// - input : on : 1
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// - driving : off : 0
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expander_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(GPPUA, I2C_TIMEOUT); if (expander_status) goto out;
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#if (EXPANDER_COL_REGISTER == GPIOA)
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# if (DIODE_DIRECTION == COL2ROW)
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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# elif (DIODE_DIRECTION == ROW2COL)
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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# endif
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#elif (EXPANDER_COL_REGISTER == GPIOB)
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# if (DIODE_DIRECTION == COL2ROW)
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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# elif (DIODE_DIRECTION == ROW2COL)
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expander_status = i2c_write(expander_input_pin_mask, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(0, I2C_TIMEOUT); if (expander_status) goto out;
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# endif
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#endif
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out:
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i2c_stop();
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}
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uint8_t matrix_scan(void)
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{
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if (expander_status) { // if there was an error
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if (++expander_reset_loop == 0) {
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// since expander_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 expander\n");
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init_expander();
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if (expander_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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#if (DIODE_DIRECTION == COL2ROW)
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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# if (DEBOUNCE > 0)
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bool matrix_changed = read_cols_on_row(matrix_debouncing, current_row);
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if (matrix_changed) {
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debouncing = true;
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debouncing_time = timer_read();
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}
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# else
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read_cols_on_row(matrix, current_row);
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# endif
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}
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#elif (DIODE_DIRECTION == ROW2COL)
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for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
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# if (DEBOUNCE > 0)
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bool matrix_changed = read_rows_on_col(matrix_debouncing, current_col);
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if (matrix_changed) {
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debouncing = true;
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debouncing_time = timer_read();
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}
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# else
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read_rows_on_col(matrix, current_col);
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# endif
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}
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#endif
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# if (DEBOUNCE > 0)
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if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCE)) {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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debouncing = false;
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}
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# endif
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matrix_scan_kb();
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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] & (ROW_SHIFTER << 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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#ifdef MATRIX_MASKED
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return matrix[row] & matrix_mask[row];
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#else
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return matrix[row];
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#endif
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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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#if (DIODE_DIRECTION == COL2ROW)
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static void init_cols(void) {
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for (uint8_t x = 0; x < MATRIX_COLS; x++) {
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if (! col_expanded[x]) {
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uint8_t pin = onboard_col_pins[x];
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_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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}
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}
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}
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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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// Clear data in matrix row
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current_matrix[current_row] = 0;
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// Select row and wait for row selection to stabilize
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select_row(current_row);
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wait_us(30);
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// Read columns from expander, unless it's in an error state
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if (! expander_status) {
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expander_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(EXPANDER_COL_REGISTER, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT); if (expander_status) goto out;
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current_matrix[current_row] |= (~i2c_read_nack(I2C_TIMEOUT)) & expander_input_pin_mask;
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out:
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i2c_stop();
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}
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// Read columns from onboard pins
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for (uint8_t col_index = 0; col_index < MATRIX_COLS; col_index++) {
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if (! col_expanded[col_index]) {
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uint8_t pin = onboard_col_pins[col_index];
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uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
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current_matrix[current_row] |= pin_state ? 0 : (ROW_SHIFTER << col_index);
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}
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}
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unselect_row(current_row);
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return (last_row_value != current_matrix[current_row]);
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}
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static void select_row(uint8_t row) {
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// select on expander, unless it's in an error state
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if (! expander_status) {
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// set active row low : 0
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// set other rows hi-Z : 1
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expander_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(EXPANDER_ROW_REGISTER, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(0xFF & ~(1<<row), I2C_TIMEOUT); if (expander_status) goto out;
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out:
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i2c_stop();
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}
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// select on teensy
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uint8_t pin = onboard_row_pins[row];
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_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
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}
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static void unselect_row(uint8_t row)
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{
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// No need to explicitly unselect expander pins--their I/O state is
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// set simultaneously, with a single bitmask sent to i2c_write. When
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// select_row selects a single pin, it implicitly unselects all the
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// other ones.
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// unselect on teensy
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uint8_t pin = onboard_row_pins[row];
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_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // OUT
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // LOW
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}
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static void unselect_rows(void) {
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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unselect_row(x);
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}
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}
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#elif (DIODE_DIRECTION == ROW2COL)
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static void init_rows(void)
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{
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for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
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uint8_t pin = onboard_row_pins[x];
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_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
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_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
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}
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}
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static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
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{
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bool matrix_changed = false;
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uint8_t column_state = 0;
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//select col and wait for selection to stabilize
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select_col(current_col);
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wait_us(30);
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if (current_col < 6) {
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// read rows from expander
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if (expander_status) {
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// it's already in an error state; nothing we can do
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return false;
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}
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expander_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_write(EXPANDER_ROW_REGISTER, I2C_TIMEOUT); if (expander_status) goto out;
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expander_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT); if (expander_status) goto out;
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column_state = i2c_read_nack(I2C_TIMEOUT);
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out:
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i2c_stop();
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column_state = ~column_state;
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} else {
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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if ((_SFR_IO8(onboard_row_pins[current_row] >> 4) & _BV(onboard_row_pins[current_row] & 0xF)) == 0) {
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column_state |= (1 << current_row);
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}
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}
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}
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for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
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// Store last value of row prior to reading
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matrix_row_t last_row_value = current_matrix[current_row];
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if (column_state & (1 << current_row)) {
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// key closed; set state bit in matrix
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current_matrix[current_row] |= (ROW_SHIFTER << current_col);
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} else {
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// key open; clear state bit in matrix
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current_matrix[current_row] &= ~(ROW_SHIFTER << current_col);
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}
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// Determine whether the matrix changed state
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if ((last_row_value != current_matrix[current_row]) && !(matrix_changed))
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{
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matrix_changed = true;
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}
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}
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unselect_col(current_col);
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return matrix_changed;
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}
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static void select_col(uint8_t col)
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{
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if (col_expanded[col]) {
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|
// select on expander
|
|
if (expander_status) { // if there was an error
|
|
// do nothing
|
|
} else {
|
|
// set active col low : 0
|
|
// set other cols hi-Z : 1
|
|
expander_status = i2c_start(I2C_ADDR_WRITE); if (expander_status) goto out;
|
|
expander_status = i2c_write(EXPANDER_COL_REGISTER); if (expander_status) goto out;
|
|
expander_status = i2c_write(0xFF & ~(1<<col)); if (expander_status) goto out;
|
|
out:
|
|
i2c_stop();
|
|
}
|
|
} else {
|
|
// select on teensy
|
|
uint8_t pin = onboard_col_pins[col];
|
|
_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
|
|
_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
|
|
}
|
|
}
|
|
|
|
static void unselect_col(uint8_t col)
|
|
{
|
|
if (col_expanded[col]) {
|
|
// No need to explicitly unselect expander pins--their I/O state is
|
|
// set simultaneously, with a single bitmask sent to i2c_write. When
|
|
// select_col selects a single pin, it implicitly unselects all the
|
|
// other ones.
|
|
} else {
|
|
// unselect on teensy
|
|
uint8_t pin = onboard_col_pins[col];
|
|
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
|
|
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
|
|
}
|
|
}
|
|
|
|
static void unselect_cols(void)
|
|
{
|
|
for(uint8_t x = 0; x < MATRIX_COLS; x++) {
|
|
unselect_col(x);
|
|
}
|
|
}
|
|
#endif
|