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/*
* MIT License
*
* Copyright (c) 2020 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "watch_buzzer.h"
#include "../../../watch-library/hardware/include/saml22j18a.h"
#include "../../../watch-library/hardware/include/component/tc.h"
#include "../../../watch-library/hardware/hri/hri_tc_l22.h"
void cb_watch_buzzer_seq(void);
static uint16_t _seq_position;
static int8_t _tone_ticks, _repeat_counter;
static bool _callback_running = false;
static int8_t *_sequence;
static void (*_cb_finished)(void);
static void _tcc_write_RUNSTDBY(bool value) {
// enables or disables RUNSTDBY of the tcc
hri_tcc_clear_CTRLA_ENABLE_bit(TCC0);
hri_tcc_write_CTRLA_RUNSTDBY_bit(TCC0, value);
hri_tcc_set_CTRLA_ENABLE_bit(TCC0);
hri_tcc_wait_for_sync(TCC0, TCC_SYNCBUSY_ENABLE);
}
static inline void _tc3_start() {
// start the TC3 timer
hri_tc_set_CTRLA_ENABLE_bit(TC3);
_callback_running = true;
}
static inline void _tc3_stop() {
// stop the TC3 timer
hri_tc_clear_CTRLA_ENABLE_bit(TC3);
hri_tc_wait_for_sync(TC3, TC_SYNCBUSY_ENABLE);
_callback_running = false;
}
static void _tc3_initialize() {
// setup and initialize TC3 for a 64 Hz interrupt
hri_mclk_set_APBCMASK_TC3_bit(MCLK);
hri_gclk_write_PCHCTRL_reg(GCLK, TC3_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK3 | GCLK_PCHCTRL_CHEN);
_tc3_stop();
hri_tc_write_CTRLA_reg(TC3, TC_CTRLA_SWRST);
hri_tc_wait_for_sync(TC3, TC_SYNCBUSY_SWRST);
hri_tc_write_CTRLA_reg(TC3, TC_CTRLA_PRESCALER_DIV64 |
TC_CTRLA_MODE_COUNT8 |
TC_CTRLA_RUNSTDBY);
hri_tccount8_write_PER_reg(TC3, 7); // 32 Khz divided by 64 divided by 8 equals 64 Hz
hri_tc_set_INTEN_OVF_bit(TC3);
NVIC_ClearPendingIRQ(TC3_IRQn);
NVIC_EnableIRQ (TC3_IRQn);
}
void watch_buzzer_play_sequence(int8_t *note_sequence, void (*callback_on_end)(void)) {
if (_callback_running) _tc3_stop();
watch_set_buzzer_off();
_sequence = note_sequence;
_cb_finished = callback_on_end;
_seq_position = 0;
_tone_ticks = 0;
_repeat_counter = -1;
// prepare buzzer
watch_enable_buzzer();
// setup TC3 timer
_tc3_initialize();
// TCC should run in standby mode
_tcc_write_RUNSTDBY(true);
// start the timer (for the 64 hz callback)
_tc3_start();
}
void cb_watch_buzzer_seq(void) {
// callback for reading the note sequence
if (_tone_ticks == 0) {
if (_sequence[_seq_position] < 0 && _sequence[_seq_position + 1]) {
// repeat indicator found
if (_repeat_counter == -1) {
// first encounter: load repeat counter
_repeat_counter = _sequence[_seq_position + 1];
} else _repeat_counter--;
if (_repeat_counter > 0)
// rewind
if (_seq_position > _sequence[_seq_position] * -2)
_seq_position += _sequence[_seq_position] * 2;
else
_seq_position = 0;
else {
// continue
_seq_position += 2;
_repeat_counter = -1;
}
}
if (_sequence[_seq_position] && _sequence[_seq_position + 1]) {
// read note
BuzzerNote note = _sequence[_seq_position];
if (note != BUZZER_NOTE_REST) {
watch_set_buzzer_period(NotePeriods[note]);
watch_set_buzzer_on();
} else watch_set_buzzer_off();
// set duration ticks and move to next tone
_tone_ticks = _sequence[_seq_position + 1];
_seq_position += 2;
} else {
// end the sequence
watch_buzzer_abort_sequence();
if (_cb_finished) _cb_finished();
}
} else _tone_ticks--;
}
void watch_buzzer_abort_sequence(void) {
// ends/aborts the sequence
if (_callback_running) _tc3_stop();
watch_set_buzzer_off();
// disable standby mode for TCC
_tcc_write_RUNSTDBY(false);
}
void TC3_Handler(void) {
// interrupt handler vor TC3 (globally!)
cb_watch_buzzer_seq();
TC3->COUNT8.INTFLAG.reg |= TC_INTFLAG_OVF;
}
inline void watch_enable_buzzer(void) {
if (!hri_tcc_get_CTRLA_reg(TCC0, TCC_CTRLA_ENABLE)) {
_watch_enable_tcc();
}
}
inline void watch_set_buzzer_period(uint32_t period) {
hri_tcc_write_PERBUF_reg(TCC0, period);
hri_tcc_write_CCBUF_reg(TCC0, WATCH_BUZZER_TCC_CHANNEL, period / 2);
}
void watch_disable_buzzer(void) {
_watch_disable_tcc();
}
inline void watch_set_buzzer_on(void) {
gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OUT);
gpio_set_pin_function(BUZZER, WATCH_BUZZER_TCC_PINMUX);
}
inline void watch_set_buzzer_off(void) {
gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OFF);
gpio_set_pin_function(BUZZER, GPIO_PIN_FUNCTION_OFF);
}
void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
if (note == BUZZER_NOTE_REST) {
watch_set_buzzer_off();
} else {
watch_set_buzzer_period(NotePeriods[note]);
watch_set_buzzer_on();
}
delay_ms(duration_ms);
watch_set_buzzer_off();
}
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