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/*
Copyright 2013 Oleg Kostyuk <cub.uanic@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "matrix.h"
#include <stdint.h>
#include <stdbool.h>
#include <avr/io.h>
#include "wait.h"
#include "action_layer.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "debounce.h"
#include "gergoplex.h"
#ifdef BALLER
# include <avr/interrupt.h>
# include "pointing_device.h"
#endif
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
// ATmega pin defs
#define COL1 (1 << 6)
#define COL2 (1 << 5)
#define COL3 (1 << 4)
#define COL4 (1 << 1)
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
/*
* matrix state(1:on, 0:off)
* contains the raw values without debounce filtering of the last read cycle.
*/
static matrix_row_t raw_matrix[MATRIX_ROWS];
static const pin_t col_pins[MATRIX_COLS] = MATRIX_COL_PINS;
// Right-hand side only pins, the left side is controlled my MCP
static const pin_t row_pins[MATRIX_ROWS_PER_SIDE] = MATRIX_ROW_PINS;
// Debouncing: store for each key the number of scans until it's eligible to
// change. When scanning the matrix, ignore any changes in keys that have
// already changed in the last DEBOUNCE scans.
static matrix_row_t read_cols(uint8_t row);
static void init_cols(void);
static void unselect_rows(void);
static void select_row(uint8_t row);
static uint8_t mcp23018_reset_loop;
__attribute__((weak)) void matrix_init_user(void) {}
__attribute__((weak)) void matrix_scan_user(void) {}
__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
void matrix_init(void) {
// initialize row and col
mcp23018_status = init_mcp23018();
unselect_rows();
init_cols();
// initialize matrix state: all keys off
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
raw_matrix[i] = 0;
}
debounce_init(MATRIX_ROWS);
matrix_init_kb();
}
void matrix_power_up(void) {
mcp23018_status = init_mcp23018();
unselect_rows();
init_cols();
// initialize matrix state: all keys off
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
}
}
// Reads and stores a row, returning
// whether a change occurred.
static inline bool store_raw_matrix_row(uint8_t index) {
matrix_row_t temp = read_cols(index);
if (raw_matrix[index] != temp) {
raw_matrix[index] = temp;
return true;
}
return false;
}
uint8_t matrix_scan(void) {
if (mcp23018_status) { // if there was an error
if (++mcp23018_reset_loop == 0) {
// if (++mcp23018_reset_loop >= 1300) {
// since mcp23018_reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
// this will be approx bit more frequent than once per second
print("trying to reset mcp23018\n");
mcp23018_status = init_mcp23018();
if (mcp23018_status) {
print("left side not responding\n");
} else {
print("left side attached\n");
}
}
}
bool changed = false;
for (uint8_t i = 0; i < MATRIX_ROWS_PER_SIDE; i++) {
// select rows from left and right hands
uint8_t left_index = i;
uint8_t right_index = i + MATRIX_ROWS_PER_SIDE;
select_row(left_index);
select_row(right_index);
// we don't need a 30us delay anymore, because selecting a
// left-hand row requires more than 30us for i2c.
changed |= store_raw_matrix_row(left_index);
changed |= store_raw_matrix_row(right_index);
unselect_rows();
}
debounce(raw_matrix, matrix, MATRIX_ROWS, changed);
matrix_scan_kb();
#ifdef DEBUG_MATRIX
for (uint8_t c = 0; c < MATRIX_COLS; c++)
for (uint8_t r = 0; r < MATRIX_ROWS; r++)
if (matrix_is_on(r, c)) xprintf("r:%d c:%d \n", r, c);
#endif
return 1;
}
inline bool matrix_is_on(uint8_t row, uint8_t col) { return (matrix[row] & ((matrix_row_t)1 << col)); }
inline matrix_row_t matrix_get_row(uint8_t row) { return matrix[row]; }
void matrix_print(void) {
print("\nr/c 0123456789ABCDEF\n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
print_hex8(row);
print(": ");
print_bin_reverse16(matrix_get_row(row));
print("\n");
}
}
// Remember this means ROWS
static void init_cols(void) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
setPinInputHigh(col_pins[col]);
}
}
static matrix_row_t read_cols(uint8_t row) {
if (row < 5) {
if (mcp23018_status) { // if there was an error
return 0;
} else {
uint8_t data = 0;
mcp23018_status = i2c_start(I2C_ADDR_READ, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_read_nack(I2C_TIMEOUT);
if (mcp23018_status < 0) goto out;
data = ~((uint8_t)mcp23018_status);
mcp23018_status = I2C_STATUS_SUCCESS;
out:
i2c_stop();
#ifdef DEBUG_MATRIX
if (data != 0x00) xprintf("I2C: %d\n", data);
#endif
return data;
}
} else {
return ~((((PINF & COL4) >> 1) | ((PINF & (COL1 | COL2 | COL3)) >> 3)) & 0xF);
}
}
// Row pin configuration
static void unselect_rows(void) {
// no need to unselect on mcp23018, because the select step sets all
// the other row bits high, and it's not changing to a different direction
for (uint8_t row = 0; row < MATRIX_ROWS_PER_SIDE; row++) {
setPinInput(row_pins[row]);
writePinLow(row_pins[row]);
}
}
static void select_row(uint8_t row) {
if (row < 5) {
// select on mcp23018
if (mcp23018_status) { // do nothing on error
} else { // set active row low : 0 // set other rows hi-Z : 1
mcp23018_status = i2c_start(I2C_ADDR_WRITE, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(GPIOA, I2C_TIMEOUT);
if (mcp23018_status) goto out;
mcp23018_status = i2c_write(0xFF & ~(1 << (row + 1)), I2C_TIMEOUT);
if (mcp23018_status) goto out;
out:
i2c_stop();
}
} else {
setPinOutput(row_pins[row - MATRIX_ROWS_PER_SIDE]);
writePinLow(row_pins[row - MATRIX_ROWS_PER_SIDE]);
}
}
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