229 lines
6.8 KiB
C
229 lines
6.8 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 <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 "debounce.h"
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#include "gergoplex.h"
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#ifdef BALLER
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# include <avr/interrupt.h>
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# include "pointing_device.h"
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#endif
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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 << 6)
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#define ROW2 (1 << 5)
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#define ROW3 (1 << 4)
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#define ROW4 (1 << 1)
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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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static const pin_t row_pins[MATRIX_COLS] = MATRIX_ROW_PINS;
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// Right-hand side only pins, the left side is controlled my MCP
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static const pin_t col_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_COL_PINS;
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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 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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__attribute__((weak)) void matrix_init_user(void) {}
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__attribute__((weak)) void matrix_scan_user(void) {}
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__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
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void matrix_init(void) {
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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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}
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debounce_init(MATRIX_ROWS);
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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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}
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// Reads and stores a row, returning
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// whether a change occurred.
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static inline bool store_raw_matrix_row(uint8_t index) {
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matrix_row_t temp = read_cols(index);
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if (raw_matrix[index] != temp) {
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raw_matrix[index] = temp;
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return true;
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}
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return false;
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}
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uint8_t matrix_scan(void) {
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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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bool changed = false;
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for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
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// select rows from left and right hands
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uint8_t left_index = i;
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uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
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select_row(left_index);
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select_row(right_index);
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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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changed |= store_raw_matrix_row(left_index);
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changed |= store_raw_matrix_row(right_index);
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unselect_rows();
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}
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debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
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matrix_scan_quantum();
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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 bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
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inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
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void matrix_print(void) {
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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);
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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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for (uint8_t row = 0; row < MATRIX_COLS; row++) {
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setPinInputHigh(row_pins[row]);
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}
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}
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static matrix_row_t read_cols(uint8_t row) {
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if (row < 5) {
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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_READ, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_read_nack(I2C_TIMEOUT);
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if (mcp23018_status < 0) goto out;
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data = ~((uint8_t)mcp23018_status);
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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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return ~((((PINF & ROW4) >> 1) | ((PINF & (ROW1 | ROW2 | ROW3)) >> 3)) & 0xF);
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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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// 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 direction
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for (uint8_t col = 0; col < MATRIX_ROWS_PER_SIDE; col++) {
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setPinInput(col_pins[col]);
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writePinLow(col_pins[col]);
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}
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}
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static void select_row(uint8_t row) {
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if (row < 5) {
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// select on mcp23018
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if (mcp23018_status) { // do nothing on error
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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, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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mcp23018_status = i2c_write(0xFF & ~(1 << (row + 1)), I2C_TIMEOUT);
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if (mcp23018_status) goto out;
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out:
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i2c_stop();
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}
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} else {
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setPinOutput(col_pins[row - MATRIX_ROWS_PER_SIDE]);
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writePinLow(col_pins[row - MATRIX_ROWS_PER_SIDE]);
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}
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}
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