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334 lines
11 KiB
334 lines
11 KiB
/* Copyright 2016 Jack Humbert
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* Copyright 2020 JohSchneider
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if defined(__AVR__)
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# include <avr/pgmspace.h>
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# include <avr/interrupt.h>
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# include <avr/io.h>
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#endif
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#include "audio.h"
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extern bool playing_note;
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extern bool playing_melody;
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extern uint8_t note_timbre;
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#define CPU_PRESCALER 8
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/*
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Audio Driver: PWM
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drive up to two speakers through the AVR PWM hardware-peripheral, using timer1 and/or timer3 on Atmega32U4.
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the primary channel_1 can be connected to either pin PC4 PC5 or PC6 (the later being used by most AVR based keyboards) with a PMW signal generated by timer3
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and an optional secondary channel_2 on either pin PB5, PB6 or PB7, with a PWM signal from timer1
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alternatively, the PWM pins on PORTB can be used as only/primary speaker
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*/
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#if defined(AUDIO_PIN) && (AUDIO_PIN != C4) && (AUDIO_PIN != C5) && (AUDIO_PIN != C6) && (AUDIO_PIN != B5) && (AUDIO_PIN != B6) && (AUDIO_PIN != B7) && (AUDIO_PIN != D5)
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# error "Audio feature enabled, but no suitable pin selected as AUDIO_PIN - see docs/feature_audio under the AVR settings for available options."
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#endif
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#if (AUDIO_PIN == C4) || (AUDIO_PIN == C5) || (AUDIO_PIN == C6)
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# define AUDIO1_PIN_SET
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# define AUDIO1_TIMSKx TIMSK3
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# define AUDIO1_TCCRxA TCCR3A
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# define AUDIO1_TCCRxB TCCR3B
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# define AUDIO1_ICRx ICR3
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# define AUDIO1_WGMx0 WGM30
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# define AUDIO1_WGMx1 WGM31
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# define AUDIO1_WGMx2 WGM32
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# define AUDIO1_WGMx3 WGM33
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# define AUDIO1_CSx0 CS30
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# define AUDIO1_CSx1 CS31
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# define AUDIO1_CSx2 CS32
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# if (AUDIO_PIN == C6)
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# define AUDIO1_COMxy0 COM3A0
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# define AUDIO1_COMxy1 COM3A1
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# define AUDIO1_OCIExy OCIE3A
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# define AUDIO1_OCRxy OCR3A
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# define AUDIO1_PIN C6
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# define AUDIO1_TIMERx_COMPy_vect TIMER3_COMPA_vect
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# elif (AUDIO_PIN == C5)
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# define AUDIO1_COMxy0 COM3B0
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# define AUDIO1_COMxy1 COM3B1
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# define AUDIO1_OCIExy OCIE3B
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# define AUDIO1_OCRxy OCR3B
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# define AUDIO1_PIN C5
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# define AUDIO1_TIMERx_COMPy_vect TIMER3_COMPB_vect
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# elif (AUDIO_PIN == C4)
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# define AUDIO1_COMxy0 COM3C0
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# define AUDIO1_COMxy1 COM3C1
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# define AUDIO1_OCIExy OCIE3C
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# define AUDIO1_OCRxy OCR3C
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# define AUDIO1_PIN C4
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# define AUDIO1_TIMERx_COMPy_vect TIMER3_COMPC_vect
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# endif
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#endif
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#if defined(AUDIO_PIN) && defined(AUDIO_PIN_ALT) && (AUDIO_PIN == AUDIO_PIN_ALT)
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# error "Audio feature: AUDIO_PIN and AUDIO_PIN_ALT on the same pin makes no sense."
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#endif
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#if ((AUDIO_PIN == B5) && ((AUDIO_PIN_ALT == B6) || (AUDIO_PIN_ALT == B7))) || ((AUDIO_PIN == B6) && ((AUDIO_PIN_ALT == B5) || (AUDIO_PIN_ALT == B7))) || ((AUDIO_PIN == B7) && ((AUDIO_PIN_ALT == B5) || (AUDIO_PIN_ALT == B6)))
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# error "Audio feature: PORTB as AUDIO_PIN and AUDIO_PIN_ALT at the same time is not supported."
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#endif
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#if defined(AUDIO_PIN_ALT) && (AUDIO_PIN_ALT != B5) && (AUDIO_PIN_ALT != B6) && (AUDIO_PIN_ALT != B7)
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# error "Audio feature: the pin selected as AUDIO_PIN_ALT is not supported."
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#endif
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#if (AUDIO_PIN == B5) || (AUDIO_PIN == B6) || (AUDIO_PIN == B7) || (AUDIO_PIN_ALT == B5) || (AUDIO_PIN_ALT == B6) || (AUDIO_PIN_ALT == B7) || (AUDIO_PIN == D5)
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# define AUDIO2_PIN_SET
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# define AUDIO2_TIMSKx TIMSK1
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# define AUDIO2_TCCRxA TCCR1A
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# define AUDIO2_TCCRxB TCCR1B
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# define AUDIO2_ICRx ICR1
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# define AUDIO2_WGMx0 WGM10
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# define AUDIO2_WGMx1 WGM11
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# define AUDIO2_WGMx2 WGM12
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# define AUDIO2_WGMx3 WGM13
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# define AUDIO2_CSx0 CS10
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# define AUDIO2_CSx1 CS11
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# define AUDIO2_CSx2 CS12
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# if (AUDIO_PIN == B5) || (AUDIO_PIN_ALT == B5)
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# define AUDIO2_COMxy0 COM1A0
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# define AUDIO2_COMxy1 COM1A1
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# define AUDIO2_OCIExy OCIE1A
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# define AUDIO2_OCRxy OCR1A
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# define AUDIO2_PIN B5
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# define AUDIO2_TIMERx_COMPy_vect TIMER1_COMPA_vect
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# elif (AUDIO_PIN == B6) || (AUDIO_PIN_ALT == B6)
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# define AUDIO2_COMxy0 COM1B0
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# define AUDIO2_COMxy1 COM1B1
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# define AUDIO2_OCIExy OCIE1B
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# define AUDIO2_OCRxy OCR1B
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# define AUDIO2_PIN B6
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# define AUDIO2_TIMERx_COMPy_vect TIMER1_COMPB_vect
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# elif (AUDIO_PIN == B7) || (AUDIO_PIN_ALT == B7)
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# define AUDIO2_COMxy0 COM1C0
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# define AUDIO2_COMxy1 COM1C1
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# define AUDIO2_OCIExy OCIE1C
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# define AUDIO2_OCRxy OCR1C
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# define AUDIO2_PIN B7
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# define AUDIO2_TIMERx_COMPy_vect TIMER1_COMPC_vect
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# elif (AUDIO_PIN == D5) && defined(__AVR_ATmega32A__)
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# pragma message "Audio support for ATmega32A is experimental and can cause crashes."
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# undef AUDIO2_TIMSKx
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# define AUDIO2_TIMSKx TIMSK
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# define AUDIO2_COMxy0 COM1A0
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# define AUDIO2_COMxy1 COM1A1
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# define AUDIO2_OCIExy OCIE1A
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# define AUDIO2_OCRxy OCR1A
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# define AUDIO2_PIN D5
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# define AUDIO2_TIMERx_COMPy_vect TIMER1_COMPA_vect
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# endif
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#endif
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// C6 seems to be the assumed default by many existing keyboard - but sill warn the user
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#if !defined(AUDIO1_PIN_SET) && !defined(AUDIO2_PIN_SET)
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# pragma message "Audio feature enabled, but no suitable pin selected - see docs/feature_audio under the AVR settings for available options. Don't expect to hear anything... :-)"
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// TODO: make this an error - go through the breaking-change-process and change all keyboards to the new define
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#endif
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// -----------------------------------------------------------------------------
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#ifdef AUDIO1_PIN_SET
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static float channel_1_frequency = 0.0f;
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void channel_1_set_frequency(float freq) {
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if (freq == 0.0f) // a pause/rest is a valid "note" with freq=0
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{
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// disable the output, but keep the pwm-ISR going (with the previous
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// frequency) so the audio-state keeps getting updated
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// Note: setting the duty-cycle 0 is not possible on non-inverting PWM mode - see the AVR data-sheet
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AUDIO1_TCCRxA &= ~(_BV(AUDIO1_COMxy1) | _BV(AUDIO1_COMxy0));
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return;
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} else {
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AUDIO1_TCCRxA |= _BV(AUDIO1_COMxy1); // enable output, PWM mode
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}
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channel_1_frequency = freq;
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// set pwm period
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AUDIO1_ICRx = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
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// and duty cycle
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AUDIO1_OCRxy = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre / 100);
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}
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void channel_1_start(void) {
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// enable timer-counter ISR
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AUDIO1_TIMSKx |= _BV(AUDIO1_OCIExy);
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// enable timer-counter output
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AUDIO1_TCCRxA |= _BV(AUDIO1_COMxy1);
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}
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void channel_1_stop(void) {
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// disable timer-counter ISR
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AUDIO1_TIMSKx &= ~_BV(AUDIO1_OCIExy);
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// disable timer-counter output
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AUDIO1_TCCRxA &= ~(_BV(AUDIO1_COMxy1) | _BV(AUDIO1_COMxy0));
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}
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#endif
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#ifdef AUDIO2_PIN_SET
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static float channel_2_frequency = 0.0f;
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void channel_2_set_frequency(float freq) {
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if (freq == 0.0f) {
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AUDIO2_TCCRxA &= ~(_BV(AUDIO2_COMxy1) | _BV(AUDIO2_COMxy0));
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return;
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} else {
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AUDIO2_TCCRxA |= _BV(AUDIO2_COMxy1);
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}
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channel_2_frequency = freq;
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AUDIO2_ICRx = (uint16_t)(((float)F_CPU) / (freq * CPU_PRESCALER));
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AUDIO2_OCRxy = (uint16_t)((((float)F_CPU) / (freq * CPU_PRESCALER)) * note_timbre / 100);
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}
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float channel_2_get_frequency(void) {
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return channel_2_frequency;
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}
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void channel_2_start(void) {
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AUDIO2_TIMSKx |= _BV(AUDIO2_OCIExy);
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AUDIO2_TCCRxA |= _BV(AUDIO2_COMxy1);
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}
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void channel_2_stop(void) {
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AUDIO2_TIMSKx &= ~_BV(AUDIO2_OCIExy);
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AUDIO2_TCCRxA &= ~(_BV(AUDIO2_COMxy1) | _BV(AUDIO2_COMxy0));
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}
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#endif
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void audio_driver_initialize() {
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#ifdef AUDIO1_PIN_SET
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channel_1_stop();
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setPinOutput(AUDIO1_PIN);
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#endif
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#ifdef AUDIO2_PIN_SET
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channel_2_stop();
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setPinOutput(AUDIO2_PIN);
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#endif
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// TCCR3A / TCCR3B: Timer/Counter #3 Control Registers TCCR3A/TCCR3B, TCCR1A/TCCR1B
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// Compare Output Mode (COM3An and COM1An) = 0b00 = Normal port operation
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// OC3A -- PC6
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// OC3B -- PC5
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// OC3C -- PC4
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// OC1A -- PB5
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// OC1B -- PB6
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// OC1C -- PB7
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// Waveform Generation Mode (WGM3n) = 0b1110 = Fast PWM Mode 14. Period = ICR3, Duty Cycle OCR3A)
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// OCR3A - PC6
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// OCR3B - PC5
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// OCR3C - PC4
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// OCR1A - PB5
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// OCR1B - PB6
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// OCR1C - PB7
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// Clock Select (CS3n) = 0b010 = Clock / 8
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#ifdef AUDIO1_PIN_SET
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// initialize timer-counter
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AUDIO1_TCCRxA = (0 << AUDIO1_COMxy1) | (0 << AUDIO1_COMxy0) | (1 << AUDIO1_WGMx1) | (0 << AUDIO1_WGMx0);
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AUDIO1_TCCRxB = (1 << AUDIO1_WGMx3) | (1 << AUDIO1_WGMx2) | (0 << AUDIO1_CSx2) | (1 << AUDIO1_CSx1) | (0 << AUDIO1_CSx0);
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#endif
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#ifdef AUDIO2_PIN_SET
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AUDIO2_TCCRxA = (0 << AUDIO2_COMxy1) | (0 << AUDIO2_COMxy0) | (1 << AUDIO2_WGMx1) | (0 << AUDIO2_WGMx0);
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AUDIO2_TCCRxB = (1 << AUDIO2_WGMx3) | (1 << AUDIO2_WGMx2) | (0 << AUDIO2_CSx2) | (1 << AUDIO2_CSx1) | (0 << AUDIO2_CSx0);
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#endif
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}
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void audio_driver_stop() {
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#ifdef AUDIO1_PIN_SET
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channel_1_stop();
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#endif
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#ifdef AUDIO2_PIN_SET
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channel_2_stop();
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#endif
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}
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void audio_driver_start(void) {
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#ifdef AUDIO1_PIN_SET
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channel_1_start();
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if (playing_note) {
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channel_1_set_frequency(audio_get_processed_frequency(0));
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}
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#endif
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#if !defined(AUDIO1_PIN_SET) && defined(AUDIO2_PIN_SET)
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channel_2_start();
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if (playing_note) {
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channel_2_set_frequency(audio_get_processed_frequency(0));
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}
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#endif
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}
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static volatile uint32_t isr_counter = 0;
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#ifdef AUDIO1_PIN_SET
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ISR(AUDIO1_TIMERx_COMPy_vect) {
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isr_counter++;
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if (isr_counter < channel_1_frequency / (CPU_PRESCALER * 8)) return;
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isr_counter = 0;
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bool state_changed = audio_update_state();
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if (!playing_note && !playing_melody) {
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channel_1_stop();
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# ifdef AUDIO2_PIN_SET
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channel_2_stop();
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# endif
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return;
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}
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if (state_changed) {
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channel_1_set_frequency(audio_get_processed_frequency(0));
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# ifdef AUDIO2_PIN_SET
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if (audio_get_number_of_active_tones() > 1) {
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channel_2_set_frequency(audio_get_processed_frequency(1));
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} else {
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channel_2_stop();
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}
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# endif
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}
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}
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#endif
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#if !defined(AUDIO1_PIN_SET) && defined(AUDIO2_PIN_SET)
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ISR(AUDIO2_TIMERx_COMPy_vect) {
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isr_counter++;
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if (isr_counter < channel_2_frequency / (CPU_PRESCALER * 8)) return;
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isr_counter = 0;
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bool state_changed = audio_update_state();
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if (!playing_note && !playing_melody) {
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channel_2_stop();
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return;
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}
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if (state_changed) {
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channel_2_set_frequency(audio_get_processed_frequency(0));
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}
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}
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#endif
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