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Diffstat (limited to 'firmware/keypad.c')
| -rw-r--r-- | firmware/keypad.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/firmware/keypad.c b/firmware/keypad.c new file mode 100644 index 0000000..1291a6e --- /dev/null +++ b/firmware/keypad.c @@ -0,0 +1,181 @@ +/* + * 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; +} |