qmk_firmware/keyboards/woodkeys/meira/matrix.c

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/*
Copyright 2012 Jun Wako <wakojun@gmail.com>
Copyright 2017 Cole Markham <cole@ccmcomputing.net>
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/>.
*/
/*
* scan matrix
*/
#include <stdint.h>
#include <stdbool.h>
#if defined(__AVR__)
#include <avr/io.h>
#endif
#include "meira.h"
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "config.h"
#include "timer.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
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#endif
#if (DEBOUNCE > 0)
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static uint16_t debouncing_time;
static bool debouncing = false;
#endif
#if (MATRIX_COLS <= 8)
# define print_matrix_header() print("\nr/c 01234567\n")
# define print_matrix_row(row) print_bin_reverse8(matrix_get_row(row))
# define ROW_SHIFTER ((uint8_t)1)
#elif (MATRIX_COLS <= 16)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse16(matrix_get_row(row))
# define ROW_SHIFTER ((uint16_t)1)
#elif (MATRIX_COLS <= 32)
# define print_matrix_header() print("\nr/c 0123456789ABCDEF0123456789ABCDEF\n")
# define print_matrix_row(row) print_bin_reverse32(matrix_get_row(row))
# define ROW_SHIFTER ((uint32_t)1)
#endif
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_PINS;
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static const uint8_t col_pins[4] = MATRIX_COL_PINS_SCANNED;
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//static const uint8_t lrow_pins[MATRIX_ROWS] = LED_ROW_PINS;
//static const uint8_t lcol_pins[4] = LED_COL_PINS;
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
static void init_rows(void);
//static void init_lcols(void);
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col);
static void unselect_cols(void);
static void select_col(uint8_t col);
__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) {
}
inline
uint8_t matrix_rows(void)
{
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void)
{
return MATRIX_COLS;
}
void matrix_init(void)
{
debug_enable = true;
debug_matrix = true;
debug_mouse = true;
// initialize row and col
unselect_cols();
init_rows();
// init_lcols();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
matrix_init_quantum();
}
uint8_t _matrix_scan(void)
{
// Set col, read rows
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
# if (DEBOUNCE > 0)
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bool matrix_changed = read_rows_on_col(matrix_debouncing, current_col);
if (matrix_changed) {
debouncing = true;
debouncing_time = timer_read();
}
# else
read_rows_on_col(matrix, current_col);
# endif
}
# if (DEBOUNCE > 0)
if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCE)) {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
debouncing = false;
}
# endif
return 1;
}
uint8_t matrix_scan(void)
{
uint8_t ret = _matrix_scan();
matrix_scan_quantum();
return ret;
}
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));
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print("\n");
}
}
static void init_rows(void)
{
for(uint8_t x = 0; x < MATRIX_ROWS; x++) {
uint8_t pin = row_pins[x];
_SFR_IO8((pin >> 4) + 1) &= ~_BV(pin & 0xF); // IN
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HI
}
}
static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
{
bool matrix_changed = false;
// Select col and wait for col selection to stabilize
select_col(current_col);
wait_us(30);
// For each row...
for(uint8_t row_index = 0; row_index < MATRIX_ROWS; row_index++)
{
// Store last value of row prior to reading
matrix_row_t last_row_value = current_matrix[row_index];
// Check row pin state
if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)) == 0)
{
// Pin LO, set col bit
current_matrix[row_index] |= (ROW_SHIFTER << current_col);
}
else
{
// Pin HI, clear col bit
current_matrix[row_index] &= ~(ROW_SHIFTER << current_col);
}
// Determine if the matrix changed state
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
{
matrix_changed = true;
}
}
// Unselect col
unselect_cols();
return matrix_changed;
}
static void select_col(uint8_t col)
{
#ifdef FLIPPED_BOARD
col = MATRIX_COLS - col - 1;
#endif
for(uint8_t x = 0; x < 4; x++) {
uint8_t pin = col_pins[x];
_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
if (((col >> x) & 0x1) == 1){
_SFR_IO8((pin >> 4) + 2) |= _BV(pin & 0xF); // HIGH
} else {
_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
}
}
}
static void unselect_cols(void)
{
// FIXME This really needs to use the global enable on the decoder, because currently this sets the value to col1
for(uint8_t x = 0; x < 4; x++) {
uint8_t pin = col_pins[x];
_SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF); // OUT
_SFR_IO8((pin >> 4) + 2) &= ~_BV(pin & 0xF); // LOW
}
}