├── LICENSE ├── README.md ├── examples ├── A4_440Hz │ └── A4_440Hz.ino ├── cricket │ └── cricket.ino ├── housefly │ └── housefly.ino ├── note_dance │ └── note_dance.ino └── test_sounds │ └── test_sounds.ino ├── keywords.txt ├── library.json ├── library.properties └── src ├── TimerOne.cpp ├── TimerOne.h ├── Volume3.cpp └── Volume3.h /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Volume3 2 | 3 | **Arduino tone() just got 10-bit volume control!*** 4 | 5 | **with no extra components!* 6 | 7 | Ever needed a project to play a tone through a speaker or piezo that *wasn't* blisteringly loud? You can bring the volume down with a resistor, but what if you needed a loud alert beep at some point as well? 8 | 9 | **Now it's no longer an issue.** :) Using ultra-fast PWM, the Volume library allows the speaker itself to act as an RC filter to produce *smooth* (**10-bit**) analog-like volume control. 10 | 11 | ---------- 12 | # Contents 13 | - [Installation](#installation) 14 | - [Usage](#usage) 15 | - [Functions](#functions) 16 | - [Supported Pins](#supported-pins) 17 | - [Limitations](#limitations) 18 | - [Volume Library Comparison](#volume-library-comparison) 19 | - [Contributing](#contributing) 20 | - [License and credits](#license-and-credits) 21 | 22 | ---------- 23 | # Installation 24 | 25 | **With Arduino Library Manager:** 26 | 27 | 1. Open *Sketch > Include Library > Manage Libraries* in the Arduino IDE. 28 | 2. Search for "Volume3", (look for "Connor Nishijima") and select the latest version. 29 | 3. Click the Install button and Arduino will prepare the library and examples for you! 30 | 31 | **Manual Install:** 32 | 33 | 1. Click "Clone or Download" above to get an "arduino-volume3-master.zip" file. 34 | 2. Extract it's contents to the libraries folder in your sketchbook. 35 | 3. Rename the folder from "arduino-volume3-master" to "Volume3". 36 | 37 | ---------- 38 | # Usage 39 | 40 | Using the volume-controlled `vol.tone()` function is very similar to the Arduino `tone()`: 41 | 42 | **Arduino:** 43 | - **tone**(unsigned int **pin**, unsigned int **frequency**); 44 | 45 | **Volume3:** 46 | - vol.**tone**(byte **pin**, unsigned int **frequency**, unsigned int **volume**); 47 | 48 | Volume control is limited to certain pins. See [Supported Pins](#supported-pins). 49 | 50 | ---------- 51 | Here is what you need to get started with the bare minimum: 52 | 53 | #include "Volume3.h" // Include the Volume library 54 | #define speakerPin 9 55 | 56 | void setup() { 57 | // Nothing here! 58 | } 59 | void loop() { 60 | uint16_t volume = 1023; 61 | uint16_t frequency = 440; 62 | while(volume > 0){ 63 | vol.tone(speakerPin,frequency,volume); 64 | volume--; 65 | delay(10); 66 | } 67 | } 68 | 69 | ---------- 70 | # Functions 71 | 72 | **vol.tone**(byte **pin**, unsigned int **frequency**, unsigned int **volume**); 73 | 74 | *This is where the magic happens.* At the frequency you specify, your Arduino will analogWrite(**volume**) to the speaker with a PWM frequency of 100,000 Hz, for half the duration of a single period of the **frequency** before pulling it `LOW`. This high-speed PWM is beyond your range of hearing, (and probably the functioning range of your speaker) so it will just sound like a quieter or louder version of the input frequency! 75 | 76 | **vol.noTone**(); 77 | 78 | This is identical in function to the standard `noTone()` function, this stops any currently playing tones. 79 | 80 | ---------- 81 | # Supported Pins 82 | 83 | | Board | Pin1 | Pin2 | Tested | 84 | |---------------------------------|-------------|---------------|--------| 85 | | (**Uno**) ATmega168/328(pb) | 9 | 10 | YES | 86 | | (**Mega**) ATmega1280/2560 | 11 | 12 | NO | 87 | | (**Leo/Micro**) ATmega16u2/32u4 | 9 | 10 | NO | 88 | 89 | ---------- 90 | # Limitations 91 | Unfortunately, cheating the Arduino's normal functions in this way means we'll lose some of them. This is also still a proof-of-concept library at this point, so it may break more functionality than I'm aware of. Sorry! 92 | 93 | **ATmega* Only:** 94 | 95 | I don't know if I'll have this working on ATTiny*5 boards any time soon, though it's theoretically possible on any AVR supported by the TimerOne. For now, it's only confirmed working on Arduino Uno (ATMega168/328) and Mega. (ATMega1280/2560) 96 | 97 | **Volume is limited to certain pins:** 98 | 99 | This is because on AVRs with Timer1 - only 2 pins are in that timer's control. It also means that while you're using Volume3, normal `analogWrite()` use probably won't work on these two pins. 100 | 101 | ---------- 102 | # Volume Library Comparison 103 | 104 | Now that there are three separately-developed Volume libraries, here is a table delineating their abilities. One will be good for higher frequencies, one will do custom waves, one will have higher volume accuracy, and so forth. Eventually I'm looking to merge them, but for now each has it's strengths and weaknesses. 105 | 106 | | Library | **Volume1** | **Volume2** | **Volume3** | 107 | |-------------------------------|-------------|-------------|---------------| 108 | | Accuracy | 8-bit (255) | 8-bit (255) | 10-bit (1023) | 109 | | Frequency Range (Hz) | 120 - 5000 | 1 - 3400 | 1 - 4186 | 110 | | PWM Frequency (Hz) | 62,500 | 62,500 | 100,000 | 111 | | Polyphony | 1 | 1 | 1 | 112 | | Needs vol.begin() | YES | YES | NO | 113 | | Compiled Library Size (Bytes) | 2,501 | 2,542 | 1,054 | 114 | | Ram Usage (Bytes) | 39 | 457 | 24 | 115 | | Frequency Slide Quality | GREAT | BAD | GOOD | 116 | | Timer Usage | 0, 1 | 0, 1 | 1 | 117 | | Delay Issue (Timer0 Prescaler)| YES | YES | NO | 118 | | Square Wave | YES | YES | YES | 119 | | Sawtooth Wave | NO | YES | NO | 120 | | Triangle Wave | NO | YES | NO | 121 | | Sine Wave | NO | YES | NO | 122 | | Custom Wave | NO | YES | NO | 123 | 124 | ---------- 125 | # Contributing 126 | Any advice or pull requests are welcome. :) 127 | 128 | ---------- 129 | # License and Credits 130 | **Developed by Connor Nishijima (2016)** 131 | 132 | **Released under the [GPLv3 license](http://www.gnu.org/licenses/gpl-3.0.en.html).** 133 | -------------------------------------------------------------------------------- /examples/A4_440Hz/A4_440Hz.ino: -------------------------------------------------------------------------------- 1 | #include "Volume3.h" 2 | #define speakerPin 9 3 | 4 | uint16_t frequency = 440; 5 | 6 | void setup() { 7 | // Nothing neeeded here! 8 | } 9 | 10 | void loop() { 11 | for(uint16_t volume = 0; volume < 1023; volume++){ 12 | vol.tone(speakerPin,frequency,volume); 13 | delay(1); 14 | } 15 | for(uint16_t volume = 1023; volume > 0; volume--){ 16 | vol.tone(speakerPin,frequency,volume); 17 | delay(1); 18 | } 19 | } 20 | -------------------------------------------------------------------------------- /examples/cricket/cricket.ino: -------------------------------------------------------------------------------- 1 | #include "Volume3.h" 2 | #define speakerPin 9 3 | 4 | void setup() { 5 | // put your setup code here, to run once: 6 | 7 | } 8 | 9 | void loop() { 10 | // put your main code here, to run repeatedly: 11 | chirpFade(); 12 | delay(random(100,5000)); 13 | } 14 | 15 | void chirpFade() { 16 | uint16_t f = 3900; 17 | 18 | uint8_t times = random(1,3); 19 | float master = 1.0; 20 | uint16_t v = 0; 21 | uint8_t vDir = 1; 22 | float vb = 0; 23 | 24 | while (times > 0) { 25 | while (vb < 1.0) { 26 | if (v < 1023 && vDir == 1) { 27 | v += 16; 28 | } 29 | else { 30 | vDir = 0; 31 | } 32 | 33 | if (v > 0 && vDir == 0) { 34 | v -= 16; 35 | } 36 | else { 37 | vDir = 1; 38 | } 39 | 40 | vol.tone(speakerPin, f, v * constrain(vb, 0.0, 1.0)*master); 41 | delayMicroseconds(50); 42 | vb += 0.003; 43 | } 44 | while (vb > 0.0) { 45 | if (v < 1023 && vDir == 1) { 46 | v += 16; 47 | } 48 | else { 49 | vDir = 0; 50 | } 51 | 52 | if (v > 0 && vDir == 0) { 53 | v -= 16; 54 | } 55 | else { 56 | vDir = 1; 57 | } 58 | 59 | vol.tone(speakerPin, f, v * constrain(vb, 0.0, 1.0)*master); 60 | delayMicroseconds(50); 61 | vb -= 0.001; 62 | } 63 | times--; 64 | master -= 0.75; 65 | } 66 | vol.noTone(); 67 | } 68 | -------------------------------------------------------------------------------- /examples/housefly/housefly.ino: -------------------------------------------------------------------------------- 1 | #include "Volume3.h" 2 | #define speakerPin 9 3 | 4 | uint16_t volume = 0; 5 | uint8_t vDir = 1; 6 | uint16_t frequency = 100; 7 | uint8_t fDir = 1; 8 | 9 | void setup() { 10 | // Nothing needed here! 11 | } 12 | 13 | void loop() { 14 | randomSeed(analogRead(A0)); 15 | 16 | if(volume < 1023 && vDir == 1){ 17 | volume+=1; 18 | } 19 | else{ 20 | vDir = 0; 21 | } 22 | if(volume > 1 && vDir == 0){ 23 | volume-=1; 24 | } 25 | else{ 26 | vDir = 1; 27 | } 28 | 29 | if(frequency < random(50,500) && fDir == 1){ 30 | frequency+=random(0,5); 31 | } 32 | if(frequency > random(0,500) && fDir == 0){ 33 | frequency-=random(0,5); 34 | } 35 | fDir = random(0,2); 36 | 37 | vol.tone(speakerPin,frequency,volume); 38 | delay(4); 39 | } 40 | -------------------------------------------------------------------------------- /examples/note_dance/note_dance.ino: -------------------------------------------------------------------------------- 1 | /* 2 | Volume3 Music Example 3 | by Connor Nishijima 4 | 5 | Picks a random note from a C Major scale to play, 6 | switches between volume-envelope and normal tone() 7 | behavior every 20 notes played. 8 | */ 9 | 10 | #include "Volume3.h" // Import the magic juju 11 | 12 | #define speakerPin 9 // Connect a speaker from Pin 9 to GND 13 | 14 | bool useVol = true; // Are we using volume envelopes? 15 | byte noteCount = 0; // Keeps track of notes played so far 16 | 17 | unsigned int scale[9] = {131, 165, 196, 262, 330, 392, 523, 659, 784}; // C Major scale in 3 octaves 18 | byte lastNote = 255; // Stores the last note played 19 | 20 | void setup() { 21 | // Nothing needed here! 22 | } 23 | 24 | void loop() { 25 | byte note = random(0, 9); // Pick a random note from the scale array 26 | 27 | while (note == lastNote) { // We don't want repeat notes, try again until we find a new one 28 | note = random(0, 9); 29 | } 30 | 31 | int frequency = scale[note]; // Set tone frequency based on the note we picked 32 | int volume = 1023; // Start volume at full 10-bit 1023 value 33 | 34 | if (useVol == true) { 35 | // Play the note, and fade it out quickly 36 | while (volume > 0) { 37 | vol.tone(speakerPin, frequency, volume); 38 | volume -= 10; 39 | delay(2); 40 | } 41 | } 42 | else { 43 | vol.tone(speakerPin, frequency, 1023); // Just use max volume here 44 | delay(110); 45 | vol.noTone(); 46 | delay(110); 47 | } 48 | 49 | noteCount++; 50 | if (noteCount % 20 == 0) { // If we've played 20 notes, switch between tone modes 51 | useVol = !useVol; 52 | } 53 | 54 | lastNote = note; // Remember the note we picked for next run 55 | } 56 | -------------------------------------------------------------------------------- /examples/test_sounds/test_sounds.ino: -------------------------------------------------------------------------------- 1 | #include "Volume3.h" 2 | 3 | #define speakerPin 9 4 | 5 | void setup() { 6 | // put your setup code here, to run once: 7 | wolfWhistle(); 8 | delay(1000); 9 | R2D2(); 10 | delay(1000); 11 | } 12 | 13 | void loop() { 14 | // put your main code here, to run repeatedly: 15 | 16 | } 17 | 18 | void gameboy(){ 19 | vol.tone(speakerPin,1025,1023); // pa 20 | delay(70); 21 | uint16_t v = 1000; 22 | while(v > 0){ 23 | vol.tone(speakerPin, 2090, v); // ting! 24 | delay(10); 25 | v-=10; 26 | } 27 | } 28 | 29 | void wolfWhistle() { 30 | int f = 122; // starting frequency 31 | int v = 0; // starting volume 32 | while (f < 4000) { // slide up to 4000Hz 33 | vol.tone(speakerPin, f, v); 34 | v = 1023 * (f / 4000.00); 35 | f += 25; 36 | delay(1); 37 | } 38 | vol.noTone(); 39 | delay(100); // wait a moment 40 | f = 122; // starting frequency 41 | v = 0; // starting volume 42 | while (f < 3000) { // slide up to 3000Hz 43 | vol.tone(speakerPin, f, v); 44 | v = 1023 * (f / 4000.00); 45 | f += 25; 46 | delay(2); 47 | } 48 | while (f > 125) { // slide down to 125Hz 49 | vol.tone(speakerPin, f, v); 50 | v = 1023 * (f / 4000.00); 51 | f -= 25; 52 | delay(2); 53 | } 54 | vol.noTone(); // end tone production 55 | } 56 | 57 | void R2D2() { 58 | int beeps[] = {1933, 2156, 1863, 1505, 1816, 1933, 1729, 2291}; 59 | int buzzVols[] = {144, 180, 216, 252, 252, 252, 252, 216, 180, 144}; 60 | 61 | int i = 9; 62 | while (i >= 0) { 63 | vol.tone(speakerPin, 1050, buzzVols[i]*4); 64 | delayMicroseconds(20*64); 65 | vol.tone(speakerPin, 1050, buzzVols[i] / 8*4); 66 | delayMicroseconds(40*64); 67 | i--; 68 | } 69 | 70 | delay(35); 71 | 72 | i = 0; 73 | while (i < 8) { 74 | int v = 0; 75 | while (v < 250) { // 12.5 mS fade up time 76 | vol.tone(speakerPin, beeps[i], v*4); 77 | v += 10; 78 | delayMicroseconds(2*64); 79 | } 80 | delay(20); 81 | v = 250; 82 | while (v > 0) { // 12.5 mS fade down time 83 | vol.tone(speakerPin, beeps[i], v*4); 84 | v -= 10; 85 | delayMicroseconds(5*64); 86 | } 87 | vol.noTone(); 88 | delay(25); 89 | i++; 90 | } 91 | 92 | int f = 2466; 93 | while (f < 2825) { 94 | vol.tone(speakerPin, f, 1023); 95 | f += 3; 96 | delay(1); 97 | } 98 | f = 2825; 99 | int v = 255; 100 | while (f > 2000) { 101 | vol.tone(speakerPin, f, v*4); 102 | f -= 6; 103 | v -= 1; 104 | delay(1); 105 | } 106 | vol.noTone(); 107 | delay(35); 108 | 109 | i = 10; 110 | while (i > 0) { 111 | vol.tone(speakerPin, 1050, buzzVols[i]*4); 112 | delayMicroseconds(20*64); 113 | vol.tone(speakerPin, 1050, buzzVols[i] / 8*4); 114 | delayMicroseconds(40*64); 115 | i--; 116 | } 117 | vol.noTone(); 118 | } 119 | -------------------------------------------------------------------------------- /keywords.txt: -------------------------------------------------------------------------------- 1 | ################################### 2 | # Syntax Coloring Map for Volume3 3 | ################################### 4 | 5 | ################################### 6 | # Datatypes (KEYWORD1) 7 | ################################### 8 | 9 | ################################### 10 | # Methods and Functions (KEYWORD2) 11 | ################################### 12 | 13 | Volume KEYWORD2 14 | vol KEYWORD2 15 | tone KEYWORD2 16 | noTone KEYWORD2 17 | 18 | ################################### 19 | # Constants (LITERAL1) 20 | ################################### 21 | -------------------------------------------------------------------------------- /library.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "Volume 3", 3 | "description": "Gives tone() functionality with 10-bit volume control with no extra parts!", 4 | "keywords": "volume,control,tone,cone,speaker,pwm,magic", 5 | "authors": 6 | { 7 | "name": "Connor Nishijima", 8 | "email": "connornishijima@gmail.com" 9 | }, 10 | "repository": 11 | { 12 | "type": "git", 13 | "url": "https://github.com/connornishijima/arduino-volume3.git" 14 | }, 15 | "version": "1.0.0", 16 | "examples": "examples/*.ino", 17 | "frameworks": "arduino", 18 | "platforms": 19 | [ 20 | "atmelavr" 21 | ] 22 | } 23 | -------------------------------------------------------------------------------- /library.properties: -------------------------------------------------------------------------------- 1 | name=Volume 3 2 | version=1.0.0 3 | author=Connor Nishijima 4 | maintainer=Connor Nishijima 5 | sentence=Gives tone functionality with 10-bit volume control with no extra parts! 6 | paragraph=Using ultrasonic PWM frequencies, you can now generate square wave tones at any frequency - and 1023 smooth volume levels - with no extra parts! 7 | category=Signal Input/Output 8 | url=https://github.com/connornishijima/arduino-volume3 9 | architectures=avr 10 | -------------------------------------------------------------------------------- /src/TimerOne.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | * Interrupt and PWM utilities for 16 bit Timer1 on ATmega168/328 3 | * Original code by Jesse Tane for http://labs.ideo.com August 2008 4 | * Modified March 2009 by Jérôme Despatis and Jesse Tane for ATmega328 support 5 | * Modified June 2009 by Michael Polli and Jesse Tane to fix a bug in setPeriod() which caused the timer to stop 6 | * Modified June 2011 by Lex Talionis to add a function to read the timer 7 | * Modified Oct 2011 by Andrew Richards to avoid certain problems: 8 | * - Add (long) assignments and casts to TimerOne::read() to ensure calculations involving tmp, ICR1 and TCNT1 aren't truncated 9 | * - Ensure 16 bit registers accesses are atomic - run with interrupts disabled when accessing 10 | * - Remove global enable of interrupts (sei())- could be running within an interrupt routine) 11 | * - Disable interrupts whilst TCTN1 == 0. Datasheet vague on this, but experiment shows that overflow interrupt 12 | * flag gets set whilst TCNT1 == 0, resulting in a phantom interrupt. Could just set to 1, but gets inaccurate 13 | * at very short durations 14 | * - startBottom() added to start counter at 0 and handle all interrupt enabling. 15 | * - start() amended to enable interrupts 16 | * - restart() amended to point at startBottom() 17 | * Modiied 7:26 PM Sunday, October 09, 2011 by Lex Talionis 18 | * - renamed start() to resume() to reflect it's actual role 19 | * - renamed startBottom() to start(). This breaks some old code that expects start to continue counting where it left off 20 | * 21 | * This program is free software: you can redistribute it and/or modify 22 | * it under the terms of the GNU General Public License as published by 23 | * the Free Software Foundation, either version 3 of the License, or 24 | * (at your option) any later version. 25 | * 26 | * This program is distributed in the hope that it will be useful, 27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 29 | * GNU General Public License for more details. 30 | * 31 | * You should have received a copy of the GNU General Public License 32 | * along with this program. If not, see . 33 | * 34 | * See Google Code project http://code.google.com/p/arduino-timerone/ for latest 35 | */ 36 | #ifndef TIMERONE_cpp 37 | #define TIMERONE_cpp 38 | 39 | #include "TimerOne.h" 40 | 41 | TimerOne Timer1; // preinstatiate 42 | 43 | ISR(TIMER1_OVF_vect) // interrupt service routine that wraps a user defined function supplied by attachInterrupt 44 | { 45 | Timer1.isrCallback(); 46 | } 47 | 48 | 49 | void TimerOne::initialize(long microseconds) 50 | { 51 | TCCR1A = 0; // clear control register A 52 | TCCR1B = _BV(WGM13); // set mode 8: phase and frequency correct pwm, stop the timer 53 | setPeriod(microseconds); 54 | } 55 | 56 | 57 | void TimerOne::setPeriod(long microseconds) // AR modified for atomic access 58 | { 59 | 60 | long cycles = (F_CPU / 2000000) * microseconds; // the counter runs backwards after TOP, interrupt is at BOTTOM so divide microseconds by 2 61 | if(cycles < RESOLUTION) clockSelectBits = _BV(CS10); // no prescale, full xtal 62 | else if((cycles >>= 3) < RESOLUTION) clockSelectBits = _BV(CS11); // prescale by /8 63 | else if((cycles >>= 3) < RESOLUTION) clockSelectBits = _BV(CS11) | _BV(CS10); // prescale by /64 64 | else if((cycles >>= 2) < RESOLUTION) clockSelectBits = _BV(CS12); // prescale by /256 65 | else if((cycles >>= 2) < RESOLUTION) clockSelectBits = _BV(CS12) | _BV(CS10); // prescale by /1024 66 | else cycles = RESOLUTION - 1, clockSelectBits = _BV(CS12) | _BV(CS10); // request was out of bounds, set as maximum 67 | 68 | oldSREG = SREG; 69 | cli(); // Disable interrupts for 16 bit register access 70 | ICR1 = pwmPeriod = cycles; // ICR1 is TOP in p & f correct pwm mode 71 | SREG = oldSREG; 72 | 73 | TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12)); 74 | TCCR1B |= clockSelectBits; // reset clock select register, and starts the clock 75 | } 76 | 77 | void TimerOne::setPwmDuty(char pin, int duty) 78 | { 79 | unsigned long dutyCycle = pwmPeriod; 80 | 81 | dutyCycle *= duty; 82 | dutyCycle >>= 10; 83 | 84 | oldSREG = SREG; 85 | cli(); 86 | if(pin == 1 || pin == 9) OCR1A = dutyCycle; 87 | else if(pin == 2 || pin == 10) OCR1B = dutyCycle; 88 | SREG = oldSREG; 89 | } 90 | 91 | void TimerOne::pwm(char pin, int duty, long microseconds) // expects duty cycle to be 10 bit (1024) 92 | { 93 | if(microseconds > 0) setPeriod(microseconds); 94 | if(pin == 1 || pin == 9) { 95 | DDRB |= _BV(PORTB1); // sets data direction register for pwm output pin 96 | TCCR1A |= _BV(COM1A1); // activates the output pin 97 | } 98 | else if(pin == 2 || pin == 10) { 99 | DDRB |= _BV(PORTB2); 100 | TCCR1A |= _BV(COM1B1); 101 | } 102 | setPwmDuty(pin, duty); 103 | resume(); // Lex - make sure the clock is running. We don't want to restart the count, in case we are starting the second WGM 104 | // and the first one is in the middle of a cycle 105 | } 106 | 107 | void TimerOne::disablePwm(char pin) 108 | { 109 | if(pin == 1 || pin == 9) TCCR1A &= ~_BV(COM1A1); // clear the bit that enables pwm on PB1 110 | else if(pin == 2 || pin == 10) TCCR1A &= ~_BV(COM1B1); // clear the bit that enables pwm on PB2 111 | } 112 | 113 | void TimerOne::attachInterrupt(void (*isr)(), long microseconds) 114 | { 115 | if(microseconds > 0) setPeriod(microseconds); 116 | isrCallback = isr; // register the user's callback with the real ISR 117 | TIMSK1 = _BV(TOIE1); // sets the timer overflow interrupt enable bit 118 | // might be running with interrupts disabled (eg inside an ISR), so don't touch the global state 119 | // sei(); 120 | resume(); 121 | } 122 | 123 | void TimerOne::detachInterrupt() 124 | { 125 | TIMSK1 &= ~_BV(TOIE1); // clears the timer overflow interrupt enable bit 126 | // timer continues to count without calling the isr 127 | } 128 | 129 | void TimerOne::resume() // AR suggested 130 | { 131 | TCCR1B |= clockSelectBits; 132 | } 133 | 134 | void TimerOne::restart() // Depricated - Public interface to start at zero - Lex 10/9/2011 135 | { 136 | start(); 137 | } 138 | 139 | void TimerOne::start() // AR addition, renamed by Lex to reflect it's actual role 140 | { 141 | unsigned int tcnt1; 142 | 143 | TIMSK1 &= ~_BV(TOIE1); // AR added 144 | GTCCR |= _BV(PSRSYNC); // AR added - reset prescaler (NB: shared with all 16 bit timers); 145 | 146 | oldSREG = SREG; // AR - save status register 147 | cli(); // AR - Disable interrupts 148 | TCNT1 = 0; 149 | SREG = oldSREG; // AR - Restore status register 150 | resume(); 151 | do { // Nothing -- wait until timer moved on from zero - otherwise get a phantom interrupt 152 | oldSREG = SREG; 153 | cli(); 154 | tcnt1 = TCNT1; 155 | SREG = oldSREG; 156 | } while (tcnt1==0); 157 | 158 | // TIFR1 = 0xff; // AR - Clear interrupt flags 159 | // TIMSK1 = _BV(TOIE1); // sets the timer overflow interrupt enable bit 160 | } 161 | 162 | void TimerOne::stop() 163 | { 164 | TCCR1B &= ~(_BV(CS10) | _BV(CS11) | _BV(CS12)); // clears all clock selects bits 165 | } 166 | 167 | unsigned long TimerOne::read() //returns the value of the timer in microseconds 168 | { //rember! phase and freq correct mode counts up to then down again 169 | unsigned long tmp; // AR amended to hold more than 65536 (could be nearly double this) 170 | unsigned int tcnt1; // AR added 171 | 172 | oldSREG= SREG; 173 | cli(); 174 | tmp=TCNT1; 175 | SREG = oldSREG; 176 | 177 | char scale=0; 178 | switch (clockSelectBits) 179 | { 180 | case 1:// no prescalse 181 | scale=0; 182 | break; 183 | case 2:// x8 prescale 184 | scale=3; 185 | break; 186 | case 3:// x64 187 | scale=6; 188 | break; 189 | case 4:// x256 190 | scale=8; 191 | break; 192 | case 5:// x1024 193 | scale=10; 194 | break; 195 | } 196 | 197 | do { // Nothing -- max delay here is ~1023 cycles. AR modified 198 | oldSREG = SREG; 199 | cli(); 200 | tcnt1 = TCNT1; 201 | SREG = oldSREG; 202 | } while (tcnt1==tmp); //if the timer has not ticked yet 203 | 204 | //if we are counting down add the top value to how far we have counted down 205 | tmp = ( (tcnt1>tmp) ? (tmp) : (long)(ICR1-tcnt1)+(long)ICR1 ); // AR amended to add casts and reuse previous TCNT1 206 | return ((tmp*1000L)/(F_CPU /1000L))<. 33 | * 34 | * See Google Code project http://code.google.com/p/arduino-timerone/ for latest 35 | */ 36 | #ifndef TIMERONE_h 37 | #define TIMERONE_h 38 | 39 | #include 40 | #include 41 | 42 | #define RESOLUTION 65536 // Timer1 is 16 bit 43 | 44 | class TimerOne 45 | { 46 | public: 47 | 48 | // properties 49 | unsigned int pwmPeriod; 50 | unsigned char clockSelectBits; 51 | char oldSREG; // To hold Status Register while ints disabled 52 | 53 | // methods 54 | void initialize(long microseconds=1000000); 55 | void start(); 56 | void stop(); 57 | void restart(); 58 | void resume(); 59 | unsigned long read(); 60 | void pwm(char pin, int duty, long microseconds=-1); 61 | void disablePwm(char pin); 62 | void attachInterrupt(void (*isr)(), long microseconds=-1); 63 | void detachInterrupt(); 64 | void setPeriod(long microseconds); 65 | void setPwmDuty(char pin, int duty); 66 | void (*isrCallback)(); 67 | }; 68 | 69 | extern TimerOne Timer1; 70 | #endif 71 | -------------------------------------------------------------------------------- /src/Volume3.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | Volume3.cpp - Library for tone() with 10-bit volume control. 3 | Created by Connor Nishijima, November 13th 2016. 4 | Released under the GPLv3 license. 5 | */ 6 | 7 | #include "Volume3.h" 8 | #include "TimerOne.h" 9 | 10 | volatile uint8_t pin1 = 0; 11 | volatile uint8_t state1 = 0; 12 | volatile uint16_t tick1 = -1; 13 | volatile uint16_t period1 = 0; 14 | volatile uint16_t volume1 = 0; 15 | 16 | volatile bool toneRun1 = false; 17 | 18 | const byte timerPin1 = 9; 19 | const byte timerPin2 = 10; 20 | 21 | void toneBegin(byte pin) { 22 | if (pin != pin1) { 23 | if (pin == timerPin1 || pin == timerPin2) { 24 | pin1 = pin; 25 | Timer1.initialize(10); 26 | Timer1.pwm(pin1, 0); 27 | Timer1.setPwmDuty(pin1, 0); 28 | state1 = 0; 29 | tick1 = -1; 30 | period1 = 0; 31 | volume1 = 0; 32 | toneRun1 = false; 33 | } 34 | else { 35 | return; 36 | } 37 | } 38 | } 39 | 40 | void cycle() { 41 | tick1++; 42 | if (tick1 >= period1) { 43 | tick1 = 0; 44 | state1 = !state1; 45 | uint16_t vol1 = state1 * volume1; 46 | Timer1.setPwmDuty(pin1, vol1); 47 | } 48 | } 49 | 50 | void Volume::noTone() { 51 | Timer1.stop(); 52 | Timer1.setPeriod(2040); 53 | digitalWrite(pin1,LOW); 54 | pin1 = 0; 55 | tick1 = -1; 56 | period1 = 0; 57 | volume1 = 0; 58 | toneRun1 = false; 59 | } 60 | 61 | void Volume::tone(uint8_t pin, uint16_t frequency, uint16_t volume){ 62 | if (frequency <= 4186) { 63 | Timer1.detachInterrupt(); 64 | toneBegin(pin); 65 | if (frequency < 2) { 66 | frequency = 2; 67 | } 68 | 69 | period1 = 100000 / (frequency * 2) + 1; 70 | volume1 = volume; 71 | if (toneRun1 == false) { 72 | toneRun1 = true; 73 | state1 = 0; 74 | tick1 = 0; 75 | } 76 | Timer1.attachInterrupt(cycle); 77 | } 78 | } 79 | -------------------------------------------------------------------------------- /src/Volume3.h: -------------------------------------------------------------------------------- 1 | /* 2 | Volume3.h - Library for tone() with 10-bit volume control. 3 | Created by Connor Nishijima, November 13th 2016. 4 | Released under the GPLv3 license. 5 | */ 6 | #ifndef volume3_h 7 | #define volume3_h 8 | 9 | #include "Arduino.h" 10 | 11 | class Volume 12 | { 13 | public: 14 | void tone(uint8_t pin, uint16_t frequency, uint16_t volume); 15 | void noTone(); 16 | }; 17 | 18 | extern Volume vol; 19 | 20 | #endif 21 | --------------------------------------------------------------------------------