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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 "sp64.h"
#include "debounce.h"
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
// 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 matrix_debouncing[MATRIX_ROWS];
static void matrix_select_row(uint8_t row);
#ifdef RIGHT_HALF
static uint8_t mcp23018_reset_loop = 0;
#endif
// user-defined overridable functions
__attribute__((weak)) void matrix_init_kb(void) { matrix_init_user(); }
__attribute__((weak)) void matrix_scan_kb(void) { matrix_scan_user(); }
__attribute__((weak)) void matrix_init_user(void) {}
__attribute__((weak)) void matrix_scan_user(void) {}
// helper functions
void matrix_init(void)
{
// all outputs for rows high
DDRB = 0xFF;
PORTB = 0xFF;
// all inputs for columns
DDRA = 0x00;
DDRC &= ~(0x111111<<2);
DDRD &= ~(1<<PIND7);
// all columns are pulled-up
PORTA = 0xFF;
PORTC |= (0b111111<<2);
PORTD |= (1<<PIND7);
#ifdef RIGHT_HALF
// initialize row and col
mcp23018_status = init_mcp23018();
#endif
// initialize matrix state: all keys off
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix[row] = 0;
matrix_debouncing[row] = 0;
}
debounce_init(MATRIX_ROWS);
matrix_init_kb();
}
uint8_t matrix_scan(void)
{
#ifdef RIGHT_HALF
// Then the keyboard
if (mcp23018_status != I2C_STATUS_SUCCESS) {
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");
}
}
}
#endif
bool changed = false;
for (uint8_t row = 0; row < MATRIX_ROWS; row++)
{
matrix_row_t cols;
matrix_select_row(row);
#ifndef RIGHT_HALF
_delay_us(5);
#endif
cols = (
// cols 0..7, PORTA 0 -> 7
(~PINA) & 0xFF
);
#ifdef RIGHT_HALF
uint8_t data = 0x7F;
// Receive the columns from right half
i2c_receive(I2C_ADDR_WRITE, &data, 1, MCP23018_I2C_TIMEOUT);
cols |= ((~(data) & 0x7F) << 7);
#endif
if (matrix_debouncing[row] != cols) {
matrix_debouncing[row] = cols;
//debouncing = DEBOUNCE;
changed = true;
}
}
debounce(matrix_debouncing, 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 (uint8_t)changed;
}
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");
}
}
static void matrix_select_row(uint8_t row)
{
#ifdef RIGHT_HALF
uint8_t txdata[3];
//Set the remote row on port A
txdata[0] = GPIOA;
txdata[1] = 0xFF & ~(1<<row);
mcp23018_status = i2c_transmit(I2C_ADDR_WRITE, (uint8_t *)txdata, 2, MCP23018_I2C_TIMEOUT);
#endif
// select other half
DDRB = (1 << row);
PORTB = ~(1 << row);
}
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