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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"
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);
}
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);
}
// note: the buzzer uses a 1 MHz clock. these values were determined by dividing 1,000,000 by the target frequency.
// i.e. for a 440 Hz tone (A4 on the piano), 1MHz/440Hz = 2273
const uint16_t NotePeriods[108] = {18182,17161,16197,15288,14430,13620,12857,12134,11453,10811,10204,9631,9091,8581,8099,7645,7216,6811,6428,6068,5727,5405,5102,4816,4545,4290,4050,3822,3608,3405,3214,3034,2863,2703,2551,2408,2273,2145,2025,1911,1804,1703,1607,1517,1432,1351,1276,1204,1136,1073,1012,956,902,851,804,758,716,676,638,602,568,536,506,478,451,426,402,379,358,338,319,301,284,268,253,239,225,213,201,190,179,169,159,150,142,134,127};
void watch_buzzer_play_note(BuzzerNote note, uint16_t duration_ms) {
if (note == BUZZER_NOTE_REST) {
watch_set_buzzer_off();
} else {
hri_tcc_write_PERBUF_reg(TCC0, NotePeriods[note]);
hri_tcc_write_CCBUF_reg(TCC0, WATCH_BUZZER_TCC_CHANNEL, NotePeriods[note] / 2);
watch_set_buzzer_on();
}
delay_ms(duration_ms);
watch_set_buzzer_off();
}
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