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/*
* Copyright © 2017 Keith Packard <keithp@keithp.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.
*/
#include <ao.h>
#include <ao_matrix.h>
#include <ao_event.h>
#include <ao_exti.h>
#define row_port(q) AO_MATRIX_ROW_ ## q ## _PORT
#define row_bit(q) AO_MATRIX_ROW_ ## q ## _PIN
#define row_pin(q) AO_MATRIX_ROW_ ## q ## _PIN
#define col_port(q) AO_MATRIX_COL_ ## q ## _PORT
#define col_bit(q) AO_MATRIX_COL_ ## q ## _PIN
#define col_pin(q) AO_MATRIX_COL_ ## q ## _PIN
static void
_ao_matrix_drive_row(uint8_t row, uint8_t val)
{
switch (row) {
#define drive(n) case n: ao_gpio_set(row_port(n), row_bit(n), row_pin(n), val); break
drive(0);
#if AO_MATRIX_ROWS > 1
drive(1);
#endif
#if AO_MATRIX_ROWS > 2
drive(2);
#endif
#if AO_MATRIX_ROWS > 3
drive(3);
#endif
#if AO_MATRIX_ROWS > 4
drive(4);
#endif
#if AO_MATRIX_ROWS > 5
drive(5);
#endif
#if AO_MATRIX_ROWS > 6
drive(6);
#endif
#if AO_MATRIX_ROWS > 7
drive(7);
#endif
}
}
static uint8_t
_ao_matrix_read_cols(void)
{
uint8_t v = 0;
#define read(n) (v |= ao_gpio_get(col_port(n), col_bit(n), col_pin(n)) << n)
read(0);
#if AO_MATRIX_ROWS > 1
read(1);
#endif
#if AO_MATRIX_ROWS > 2
read(2);
#endif
#if AO_MATRIX_ROWS > 3
read(3);
#endif
#if AO_MATRIX_ROWS > 4
read(4);
#endif
#if AO_MATRIX_ROWS > 5
read(5);
#endif
#if AO_MATRIX_ROWS > 6
read(6);
#endif
#if AO_MATRIX_ROWS > 7
read(7);
#endif
return v;
}
static uint8_t
_ao_matrix_read(uint8_t row) {
uint8_t state;
_ao_matrix_drive_row(row, 0);
state = _ao_matrix_read_cols();
_ao_matrix_drive_row(row, 1);
return state;
}
#define AO_MATRIX_DEBOUNCE_INTERVAL AO_MS_TO_TICKS(50)
static uint8_t ao_matrix_keymap[AO_MATRIX_ROWS][AO_MATRIX_COLS] = AO_MATRIX_KEYCODES;
static uint8_t ao_matrix_state[AO_MATRIX_ROWS];
static AO_TICK_TYPE ao_matrix_tick[AO_MATRIX_ROWS];
static void
_ao_matrix_poll_one(uint8_t row) {
uint8_t state = _ao_matrix_read(row);
if (state != ao_matrix_state[row]) {
AO_TICK_TYPE now = ao_time();
if ((now - ao_matrix_tick[row]) >= AO_MATRIX_DEBOUNCE_INTERVAL) {
uint8_t col;
uint8_t changes = state ^ ao_matrix_state[row];
for (col = 0; col < AO_MATRIX_COLS; col++) {
if (changes & (1 << col)) {
ao_event_put_isr(AO_EVENT_KEY,
ao_matrix_keymap[row][col],
((state >> col) & 1) == 0);
}
}
ao_matrix_state[row] = state;
}
ao_matrix_tick[row] = now;
}
}
void
ao_matrix_poll(void)
{
uint8_t row;
for (row = 0; row < AO_MATRIX_ROWS; row++)
_ao_matrix_poll_one(row);
}
#define init_row(b) do { \
ao_enable_output(row_port(b), row_bit(b), row_pin(v), 1); \
ao_gpio_set_output_mode(row_port(b), row_bit(b), row_pin(b), AO_OUTPUT_OPEN_DRAIN); \
} while (0)
#define init_col(b) do { \
ao_enable_input(col_port(b), col_bit(b), AO_EXTI_MODE_PULL_UP); \
} while(0)
void
ao_matrix_init(void)
{
uint8_t row;
init_row(0);
#if AO_MATRIX_ROWS > 1
init_row(1);
#endif
#if AO_MATRIX_ROWS > 2
init_row(2);
#endif
#if AO_MATRIX_ROWS > 3
init_row(3);
#endif
#if AO_MATRIX_ROWS > 4
init_row(4);
#endif
#if AO_MATRIX_ROWS > 5
init_row(5);
#endif
#if AO_MATRIX_ROWS > 6
init_row(6);
#endif
#if AO_MATRIX_ROWS > 7
init_row(7);
#endif
init_col(0);
#if AO_MATRIX_COLS > 1
init_col(1);
#endif
#if AO_MATRIX_COLS > 2
init_col(2);
#endif
#if AO_MATRIX_COLS > 3
init_col(3);
#endif
#if AO_MATRIX_COLS > 4
init_col(4);
#endif
#if AO_MATRIX_COLS > 5
init_col(5);
#endif
#if AO_MATRIX_COLS > 6
init_col(6);
#endif
#if AO_MATRIX_COLS > 7
init_col(7);
#endif
for (row = 0; row < AO_MATRIX_ROWS; row++) {
ao_matrix_state[row] = _ao_matrix_read(row);
ao_matrix_tick[row] = ao_time();
}
}
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