263 lines
7 KiB
C
263 lines
7 KiB
C
/*
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Copyright 2012-2017 Jun Wako, Jack Humbert
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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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#if defined(__AVR__)
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#include <avr/io.h>
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#endif
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#include "wait.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 "timer.h"
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#include "sx60.h"
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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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#if (MATRIX_COLS <= 8)
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# define print_matrix_header() print("\nr/c 01234567\n")
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# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
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# define ROW_SHIFTER ((uint8_t)1)
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#elif (MATRIX_COLS <= 16)
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# define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
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# define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
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# define ROW_SHIFTER ((uint16_t)1)
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#elif (MATRIX_COLS <= 32)
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# define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
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# define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
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# define ROW_SHIFTER ((uint32_t)1)
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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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static const uint8_t col_pins[ATMEGA_COLS] = MATRIX_COL_PINS;
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static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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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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static uint8_t mcp23018_reset_loop;
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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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__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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__attribute__ ((weak))
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void matrix_init_user(void) {
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}
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__attribute__ ((weak))
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void matrix_scan_user(void) {
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}
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inline
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uint8_t matrix_rows(void) {
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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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return MATRIX_COLS;
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}
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void matrix_init(void) {
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mcp23018_status = true;
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/* initialize row and col */
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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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matrix_debouncing[i] = 0;
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}
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matrix_init_kb();
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}
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uint8_t matrix_scan(void)
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{
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if (mcp23018_status) {
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/* 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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/* Set row, read cols */
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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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# 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] & ((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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/* Matrix mask lets you disable switches in the returned matrix data. For example, if you have a
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switch blocker installed and the switch is always pressed. */
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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_matrix_header();
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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_matrix_row(row);
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print("\n");
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}
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}
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static void init_cols(void)
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{
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for(uint8_t x = 0; x < ATMEGA_COLS; x++) {
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uint8_t pin = 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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static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
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{
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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 selecton to stabilize */
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select_row(current_row);
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wait_us(30);
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if (mcp23018_status) {
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/* 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_readReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
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if (!mcp23018_status) {
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current_matrix[current_row] |= (~((uint16_t)data) << 8);
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}
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}
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/* For each col... */
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for(uint8_t col_index = 0; col_index < ATMEGA_COLS; col_index++) {
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/* Select the col pin to read (active low) */
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uint8_t pin = col_pins[col_index];
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uint8_t pin_state = (_SFR_IO8(pin >> 4) & _BV(pin & 0xF));
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/* Populate the matrix row with the state of the col pin */
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current_matrix[current_row] |= pin_state ? 0 : (ROW_SHIFTER << col_index);
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}
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/* Unselect row */
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unselect_rows();
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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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{
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if (mcp23018_status) {
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/* if there was an error do nothing */
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} else {
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/* set active row low : 0
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set active row output : 1
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set other rows hi-Z : 1 */
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uint8_t port = 0xFF & ~(1<<abs(row-4));
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mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOB, &port, 1, I2C_TIMEOUT);
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}
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uint8_t pin = 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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{
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for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
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uint8_t pin = 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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