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big PWM refactor: drive both LEDs and buzzer from TCC

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This commit is contained in:
Joey Castillo
2021-08-29 17:40:44 -04:00
parent 7dc4b0fdc6
commit 6353d25d46
8 changed files with 120 additions and 76 deletions
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22
watch-library/watch/watch_buzzer.c
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@@ -23,28 +23,38 @@
*/
inline void watch_enable_buzzer() {
PWM_1_init();
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);
}
inline void watch_set_buzzer_period(uint32_t period) {
pwm_set_parameters(&PWM_1, period, period / 2);
void watch_disable_buzzer() {
_watch_disable_tcc();
}
inline void watch_set_buzzer_on() {
pwm_enable(&PWM_1);
gpio_set_pin_direction(BUZZER, GPIO_DIRECTION_OUT);
gpio_set_pin_function(BUZZER, PINMUX_PA27F_TCC0_WO5);
}
inline void watch_set_buzzer_off() {
pwm_disable(&PWM_1);
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 {
pwm_set_parameters(&PWM_1, NotePeriods[note], NotePeriods[note] / 2);
hri_tcc_write_PERBUF_reg(TCC0, NotePeriods[note]);
hri_tcc_write_CCBUF_reg(TCC0, 1, NotePeriods[note] / 2);
watch_set_buzzer_on();
}
delay_ms(duration_ms);