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qmk_firmware/keyboards/kmini/matrix.c

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/* Copyright 2018 Evy Dekkers
*
* 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 <stdint.h>
#include <stdbool.h>
#if defined(__AVR__)
#include <avr/io.h>
#endif
#include "wait.h"
#include "print.h"
#include "debug.h"
#include "util.h"
#include "matrix.h"
#include "timer.h"
/* Set 0 if debouncing isn't needed */
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
#define COL_SHIFTER ((uint32_t)1)
static uint16_t debouncing_time;
static bool debouncing = false;
static const uint8_t row_pins[MATRIX_ROWS] = MATRIX_ROW_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 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_user(void) {}
__attribute__ ((weak))
void matrix_scan_user(void) {}
__attribute__ ((weak))
void matrix_init_kb(void) {
matrix_init_user();
}
__attribute__ ((weak))
void matrix_scan_kb(void) {
matrix_scan_user();
}
inline
uint8_t matrix_rows(void) {
return MATRIX_ROWS;
}
inline
uint8_t matrix_cols(void) {
return MATRIX_COLS;
}
void matrix_init(void) {
unselect_cols();
init_rows();
// initialize matrix state: all keys off
for (uint8_t i=0; i < MATRIX_ROWS; i++) {
matrix[i] = 0;
matrix_debouncing[i] = 0;
}
matrix_init_kb();
}
uint8_t matrix_scan(void)
{
// Set col, read rows
for (uint8_t current_col = 0; current_col < MATRIX_COLS; current_col++) {
bool matrix_changed = read_rows_on_col(matrix_debouncing, current_col);
if (matrix_changed) {
debouncing = true;
debouncing_time = timer_read();
}
}
if (debouncing && (timer_elapsed(debouncing_time) > DEBOUNCE)) {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
debouncing = false;
}
matrix_scan_kb();
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 0123456789ABCDEFGHIJKLMNOPQRSTUV \n");
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
print_hex8(row); print(": ");
print_bin_reverse32(matrix_get_row(row));
print("\n");
}
}
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 selecton 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
// Use the otherwise unused row: 3, col: 0 for caps lock
if (row_index == 2 && current_col == 2) {
// Pin E2 uses active low
if ((_SFR_IO8(E2 >> 4) & _BV(E2 & 0xF)) == 0)
{
// Pin LO, set col bit
current_matrix[row_index] |= (COL_SHIFTER << current_col);
}
else
{
// Pin HI, clear col bit
current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
}
}
else {
if ((_SFR_IO8(row_pins[row_index] >> 4) & _BV(row_pins[row_index] & 0xF)))
{
// Pin HI, set col bit
current_matrix[row_index] |= (COL_SHIFTER << current_col);
}
else
{
// Pin LO, clear col bit
current_matrix[row_index] &= ~(COL_SHIFTER << current_col);
}
}
// Determine if the matrix changed state
if ((last_row_value != current_matrix[row_index]) && !(matrix_changed))
{
matrix_changed = true;
}
}
// Unselect cols
unselect_cols();
return matrix_changed;
}
/* Row pin configuration
* row: 0 1 2 3 4
* pin: D0 D1 D2 D3 D5
*
* Caps lock uses its own pin E2
*/
static void init_rows(void) {
gpio_set_pin_input(D0);
gpio_set_pin_input(D1);
gpio_set_pin_input(D2);
gpio_set_pin_input(D3);
gpio_set_pin_input(D5);
gpio_set_pin_input_high(E2);
}
/* Columns 0 - 16
* col 0: B5
* col 1: B6
* These columns use a 74HC237D 3 to 8 bit demultiplexer.
* A B C GL1
* col / pin: PF0 PF1 PC7 PC6
* 2: 0 0 0 1
* 3: 1 0 0 1
* 4: 0 1 0 1
* 5: 1 1 0 1
* 6: 0 0 1 1
* 7: 1 0 1 1
* 8: 0 1 1 1
* 9: 1 1 1 1
* col 10: E6
* col 11: B0
* col 12: B7
* col 13: D4
* col 14: D6
* col 15: D7
* col 16: B4
*/
static void unselect_cols(void) {
gpio_set_pin_output(B0);
gpio_set_pin_output(B4);
gpio_set_pin_output(B5);
gpio_set_pin_output(B6);
gpio_set_pin_output(B7);
gpio_write_pin_low(B0);
gpio_write_pin_low(B4);
gpio_write_pin_low(B5);
gpio_write_pin_low(B6);
gpio_write_pin_low(B7);
gpio_set_pin_output(D4);
gpio_set_pin_output(D6);
gpio_set_pin_output(D7);
gpio_write_pin_low(D4);
gpio_write_pin_low(D6);
gpio_write_pin_low(D7);
gpio_set_pin_output(E6);
gpio_write_pin_low(E6);
gpio_set_pin_output(F0);
gpio_set_pin_output(F1);
gpio_write_pin_low(F0);
gpio_write_pin_low(F1);
gpio_set_pin_output(C6);
gpio_set_pin_output(C7);
gpio_write_pin_low(C6);
gpio_write_pin_low(C7);
}
static void select_col(uint8_t col)
{
switch (col) {
case 0:
gpio_write_pin_high(B5); // HI
break;
case 1:
gpio_write_pin_high(B6); // HI
break;
case 2:
gpio_write_pin_high(C6); // HI
break;
case 3:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F0); // HI
break;
case 4:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F1); // HI
break;
case 5:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F0); // HI
gpio_write_pin_high(F1); // HI
break;
case 6:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(C7); // HI
break;
case 7:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F0); // HI
gpio_write_pin_high(C7); // HI
break;
case 8:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F1); // HI
gpio_write_pin_high(C7); // HI
break;
case 9:
gpio_write_pin_high(C6); // HI
gpio_write_pin_high(F0); // HI
gpio_write_pin_high(F1); // HI
gpio_write_pin_high(C7); // HI
break;
case 10:
gpio_write_pin_high(E6); // HI
break;
case 11:
gpio_write_pin_high(B0); // HI
break;
case 12:
gpio_write_pin_high(B7); // HI
break;
case 13:
gpio_write_pin_high(D4); // HI
break;
case 14:
gpio_write_pin_high(D6); // HI
break;
case 15:
gpio_write_pin_high(D7); // HI
break;
case 16:
gpio_write_pin_high(B4); // HI
break;
}
}
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