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/*
* spreadspace avr projects
*
*
* Copyright (C) 2013-2015 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of spreadspace avr projects.
*
* spreadspace avr projects 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 3 of the License, or
* any later version.
*
* spreadspace avr projects 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 spreadspace avr projects. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <util/delay.h>
#include "keypad.h"
#include "eventqueue.h"
#define KEYPAD_LP_CNT_MAX 200
static struct {
uint8_t last_sent;
int16_t lp_cnt;
} keypad_state[KEYPAD_NUM_KEYS];
static struct {
uint16_t timebase;
uint16_t cnt;
} led_blink_state[KEYPAD_NUM_KEYS];
#define KEYPAD_BLINK_TIMEBASE_MULT 128
void keypad_init(void)
{
// KEYS are at F4..F7
DDRF &= 0x0F;
PORTF |= 0xF0;
uint8_t i;
for(i = 0; i < KEYPAD_NUM_KEYS; ++i) {
keypad_state[i].last_sent = 0;
keypad_state[i].lp_cnt = 0;
led_blink_state[i].timebase = 0;
led_blink_state[i].cnt = 0;
}
// LEDS are at D0..D3
DDRD |= 0x0F;
PORTD &= 0xFC;
PORTD |= 0x0C;
}
void keypad_led_on(uint8_t led)
{
switch(led) {
case 0: PORTD |= 0x01; break;
case 1: PORTD |= 0x02; break;
case 2: PORTD &= 0xFB; break;
case 3: PORTD &= 0xF7; break;
case KEYPAD_MIDI_NOTE_ALL - KEYPAD_MIDI_NOTE_OFFSET: PORTD |= 0x03; PORTD &= 0xF3;; break;
}
keypad_led_blink(led, 0);
}
void keypad_led_off(uint8_t led)
{
switch(led) {
case 0: PORTD &= 0xFE; break;
case 1: PORTD &= 0xFD; break;
case 2: PORTD |= 0x04; break;
case 3: PORTD |= 0x08; break;
case KEYPAD_MIDI_NOTE_ALL - KEYPAD_MIDI_NOTE_OFFSET: PORTD &= 0xFC; PORTD |= 0x0C; break;
}
keypad_led_blink(led, 0);
}
void keypad_led_toggle(uint8_t led)
{
switch(led) {
case 0:
case 1:
case 2:
case 3: PORTD ^= (1 << led); break;
case KEYPAD_MIDI_NOTE_ALL - KEYPAD_MIDI_NOTE_OFFSET: PORTD ^= 0x0F; break;
}
}
static uint8_t keypad_led_get_state(uint8_t led)
{
switch(led) {
case 0:
case 1: return (PORTD & (1 << led)) ? 0 : 1;
case 2:
case 3: return (PORTD & (1 << led)) ? 1 : 0;
default: return 0;
}
}
static void keypad_led_blink_sync(uint8_t led)
{
uint8_t i;
for(i = 0; i < KEYPAD_NUM_KEYS; ++i) {
if(i != led && led_blink_state[i].timebase == led_blink_state[led].timebase) {
led_blink_state[led].cnt = led_blink_state[i].cnt;
if(keypad_led_get_state(led) != keypad_led_get_state(i))
keypad_led_toggle(led);
break;
}
}
}
void keypad_led_blink(uint8_t led, uint8_t value)
{
if(led < KEYPAD_NUM_KEYS) {
led_blink_state[led].timebase = value * KEYPAD_BLINK_TIMEBASE_MULT;
led_blink_state[led].cnt = 0;
if(value)
keypad_led_blink_sync(led);
} else {
uint8_t i;
for(i = 0; i < KEYPAD_NUM_KEYS; ++i) {
led_blink_state[i].timebase = value * KEYPAD_BLINK_TIMEBASE_MULT;
led_blink_state[i].cnt = 0;
}
}
}
static inline void keypad_key_lowpass(uint8_t key_idx, uint8_t current_state)
{
keypad_state[key_idx].lp_cnt += current_state ? -1 : +1;
if(keypad_state[key_idx].lp_cnt <= 0 ||
keypad_state[key_idx].lp_cnt >= KEYPAD_LP_CNT_MAX) {
keypad_state[key_idx].lp_cnt = keypad_state[key_idx].lp_cnt <= 0 ? 0 : KEYPAD_LP_CNT_MAX;
if(current_state != keypad_state[key_idx].last_sent) {
keypad_state[key_idx].last_sent = current_state;
eventqueue_push(KEYPAD_MIDI_NOTE_OFFSET + key_idx, ((current_state) ? 0 : 1));
}
}
}
static inline void keypad_led_blinking(uint8_t key_idx)
{
if(led_blink_state[key_idx].timebase > 1) {
if(++led_blink_state[key_idx].cnt >= led_blink_state[key_idx].timebase) {
keypad_led_toggle(key_idx);
led_blink_state[key_idx].cnt = 0;
}
}
}
void keypad_task(void)
{
uint8_t col, row;
for(col = 0; col < KEYPAD_NUM_COLS; ++col) {
/* KEYPAD_DDR = 1 << (col + 4); */
/* KEYPAD_PORT = 0x0F; */
_delay_us(20);
for(row = 0; row < KEYPAD_NUM_ROWS; ++row) {
uint8_t key_idx = col*KEYPAD_NUM_ROWS + row;
// uint8_t current_state = KEYPAD_PIN & (1 << row);
uint8_t current_state = PINF & (1 << (row+4));
keypad_key_lowpass(key_idx, current_state);
keypad_led_blinking(key_idx);
}
}
// KEYPAD_DDR = 0x00;
}
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