├── .codespellrc ├── .github ├── dependabot.yml └── workflows │ ├── check-arduino.yml │ ├── compile-examples.yml │ ├── report-size-deltas.yml │ ├── spell-check.yml │ └── sync-labels.yml ├── LICENSE.txt ├── README.adoc ├── docs ├── api.md └── readme.md ├── examples └── SimpleAudioPlayer │ └── SimpleAudioPlayer.ino ├── keywords.txt ├── library.properties └── src ├── Audio.cpp ├── Audio.h ├── DAC.cpp └── DAC.h /.codespellrc: -------------------------------------------------------------------------------- 1 | # See: https://github.com/codespell-project/codespell#using-a-config-file 2 | [codespell] 3 | # In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here: 4 | ignore-words-list = , 5 | check-filenames = 6 | check-hidden = 7 | skip = ./.git 8 | -------------------------------------------------------------------------------- /.github/dependabot.yml: -------------------------------------------------------------------------------- 1 | # See: https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#about-the-dependabotyml-file 2 | version: 2 3 | 4 | updates: 5 | # Configure check for outdated GitHub Actions actions in workflows. 6 | # See: https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-dependabot 7 | - package-ecosystem: github-actions 8 | directory: / # Check the repository's workflows under /.github/workflows/ 9 | schedule: 10 | interval: daily 11 | -------------------------------------------------------------------------------- /.github/workflows/check-arduino.yml: -------------------------------------------------------------------------------- 1 | name: Check Arduino 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | pull_request: 7 | schedule: 8 | # Run every Tuesday at 8 AM UTC to catch breakage caused by new rules added to Arduino Lint. 9 | - cron: "0 8 * * TUE" 10 | workflow_dispatch: 11 | repository_dispatch: 12 | 13 | jobs: 14 | lint: 15 | runs-on: ubuntu-latest 16 | 17 | steps: 18 | - name: Checkout repository 19 | uses: actions/checkout@v4 20 | 21 | - name: Arduino Lint 22 | uses: arduino/arduino-lint-action@v2 23 | with: 24 | compliance: specification 25 | library-manager: update 26 | # Always use this setting for official repositories. Remove for 3rd party projects. 27 | official: true 28 | project-type: library 29 | -------------------------------------------------------------------------------- /.github/workflows/compile-examples.yml: -------------------------------------------------------------------------------- 1 | name: Compile Examples 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | paths: 7 | - ".github/workflows/compile-examples.yml" 8 | - "examples/**" 9 | - "src/**" 10 | pull_request: 11 | paths: 12 | - ".github/workflows/compile-examples.yml" 13 | - "examples/**" 14 | - "src/**" 15 | schedule: 16 | # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to external resources (libraries, platforms). 17 | - cron: "0 8 * * TUE" 18 | workflow_dispatch: 19 | repository_dispatch: 20 | 21 | jobs: 22 | build: 23 | name: ${{ matrix.board.fqbn }} 24 | runs-on: ubuntu-latest 25 | 26 | env: 27 | SKETCHES_REPORTS_PATH: sketches-reports 28 | 29 | strategy: 30 | fail-fast: false 31 | 32 | matrix: 33 | board: 34 | - fqbn: arduino:sam:arduino_due_x_dbg 35 | platforms: | 36 | - name: arduino:sam 37 | artifact-name-suffix: arduino-sam-arduino_due_x_dbg 38 | 39 | steps: 40 | - name: Checkout repository 41 | uses: actions/checkout@v4 42 | 43 | - name: Compile examples 44 | uses: arduino/compile-sketches@v1 45 | with: 46 | github-token: ${{ secrets.GITHUB_TOKEN }} 47 | fqbn: ${{ matrix.board.fqbn }} 48 | platforms: ${{ matrix.board.platforms }} 49 | libraries: | 50 | # Install the library from the local path. 51 | - source-path: ./ 52 | - name: SD 53 | sketch-paths: | 54 | - examples 55 | enable-deltas-report: true 56 | sketches-report-path: ${{ env.SKETCHES_REPORTS_PATH }} 57 | 58 | - name: Save sketches report as workflow artifact 59 | uses: actions/upload-artifact@v4 60 | with: 61 | if-no-files-found: error 62 | path: ${{ env.SKETCHES_REPORTS_PATH }} 63 | name: sketches-report-${{ matrix.board.artifact-name-suffix }} 64 | -------------------------------------------------------------------------------- /.github/workflows/report-size-deltas.yml: -------------------------------------------------------------------------------- 1 | name: Report Size Deltas 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | paths: 7 | - ".github/workflows/report-size-deltas.yml" 8 | schedule: 9 | # Run at the minimum interval allowed by GitHub Actions. 10 | # Note: GitHub Actions periodically has outages which result in workflow failures. 11 | # In this event, the workflows will start passing again once the service recovers. 12 | - cron: "*/5 * * * *" 13 | workflow_dispatch: 14 | repository_dispatch: 15 | 16 | jobs: 17 | report: 18 | runs-on: ubuntu-latest 19 | steps: 20 | - name: Comment size deltas reports to PRs 21 | uses: arduino/report-size-deltas@v1 22 | with: 23 | # Regex matching the names of the workflow artifacts created by the "Compile Examples" workflow 24 | sketches-reports-source: ^sketches-report-.+ 25 | -------------------------------------------------------------------------------- /.github/workflows/spell-check.yml: -------------------------------------------------------------------------------- 1 | name: Spell Check 2 | 3 | # See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows 4 | on: 5 | push: 6 | pull_request: 7 | schedule: 8 | # Run every Tuesday at 8 AM UTC to catch new misspelling detections resulting from dictionary updates. 9 | - cron: "0 8 * * TUE" 10 | workflow_dispatch: 11 | repository_dispatch: 12 | 13 | jobs: 14 | spellcheck: 15 | runs-on: ubuntu-latest 16 | 17 | steps: 18 | - name: Checkout repository 19 | uses: actions/checkout@v4 20 | 21 | - name: Spell check 22 | uses: codespell-project/actions-codespell@master 23 | -------------------------------------------------------------------------------- /.github/workflows/sync-labels.yml: -------------------------------------------------------------------------------- 1 | # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/sync-labels.md 2 | name: Sync Labels 3 | 4 | # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows 5 | on: 6 | push: 7 | paths: 8 | - ".github/workflows/sync-labels.ya?ml" 9 | - ".github/label-configuration-files/*.ya?ml" 10 | pull_request: 11 | paths: 12 | - ".github/workflows/sync-labels.ya?ml" 13 | - ".github/label-configuration-files/*.ya?ml" 14 | schedule: 15 | # Run daily at 8 AM UTC to sync with changes to shared label configurations. 16 | - cron: "0 8 * * *" 17 | workflow_dispatch: 18 | repository_dispatch: 19 | 20 | env: 21 | CONFIGURATIONS_FOLDER: .github/label-configuration-files 22 | CONFIGURATIONS_ARTIFACT: label-configuration-files 23 | 24 | jobs: 25 | check: 26 | runs-on: ubuntu-latest 27 | 28 | steps: 29 | - name: Checkout repository 30 | uses: actions/checkout@v4 31 | 32 | - name: Download JSON schema for labels configuration file 33 | id: download-schema 34 | uses: carlosperate/download-file-action@v2 35 | with: 36 | file-url: https://raw.githubusercontent.com/arduino/tooling-project-assets/main/workflow-templates/assets/sync-labels/arduino-tooling-gh-label-configuration-schema.json 37 | location: ${{ runner.temp }}/label-configuration-schema 38 | 39 | - name: Install JSON schema validator 40 | run: | 41 | sudo npm install \ 42 | --global \ 43 | ajv-cli \ 44 | ajv-formats 45 | 46 | - name: Validate local labels configuration 47 | run: | 48 | # See: https://github.com/ajv-validator/ajv-cli#readme 49 | ajv validate \ 50 | --all-errors \ 51 | -c ajv-formats \ 52 | -s "${{ steps.download-schema.outputs.file-path }}" \ 53 | -d "${{ env.CONFIGURATIONS_FOLDER }}/*.{yml,yaml}" 54 | 55 | download: 56 | needs: check 57 | runs-on: ubuntu-latest 58 | 59 | strategy: 60 | matrix: 61 | filename: 62 | # Filenames of the shared configurations to apply to the repository in addition to the local configuration. 63 | # https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/sync-labels 64 | - universal.yml 65 | 66 | steps: 67 | - name: Download 68 | uses: carlosperate/download-file-action@v2 69 | with: 70 | file-url: https://raw.githubusercontent.com/arduino/tooling-project-assets/main/workflow-templates/assets/sync-labels/${{ matrix.filename }} 71 | 72 | - name: Pass configuration files to next job via workflow artifact 73 | uses: actions/upload-artifact@v4 74 | with: 75 | path: | 76 | *.yaml 77 | *.yml 78 | if-no-files-found: error 79 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 80 | 81 | sync: 82 | needs: download 83 | runs-on: ubuntu-latest 84 | 85 | steps: 86 | - name: Set environment variables 87 | run: | 88 | # See: https://docs.github.com/en/actions/reference/workflow-commands-for-github-actions#setting-an-environment-variable 89 | echo "MERGED_CONFIGURATION_PATH=${{ runner.temp }}/labels.yml" >> "$GITHUB_ENV" 90 | 91 | - name: Determine whether to dry run 92 | id: dry-run 93 | if: > 94 | github.event_name == 'pull_request' || 95 | ( 96 | ( 97 | github.event_name == 'push' || 98 | github.event_name == 'workflow_dispatch' 99 | ) && 100 | github.ref != format('refs/heads/{0}', github.event.repository.default_branch) 101 | ) 102 | run: | 103 | # Use of this flag in the github-label-sync command will cause it to only check the validity of the 104 | # configuration. 105 | echo "::set-output name=flag::--dry-run" 106 | 107 | - name: Checkout repository 108 | uses: actions/checkout@v4 109 | 110 | - name: Download configuration files artifact 111 | uses: actions/download-artifact@v4 112 | with: 113 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 114 | path: ${{ env.CONFIGURATIONS_FOLDER }} 115 | 116 | - name: Remove unneeded artifact 117 | uses: geekyeggo/delete-artifact@v5 118 | with: 119 | name: ${{ env.CONFIGURATIONS_ARTIFACT }} 120 | 121 | - name: Merge label configuration files 122 | run: | 123 | # Merge all configuration files 124 | shopt -s extglob 125 | cat "${{ env.CONFIGURATIONS_FOLDER }}"/*.@(yml|yaml) > "${{ env.MERGED_CONFIGURATION_PATH }}" 126 | 127 | - name: Install github-label-sync 128 | run: sudo npm install --global github-label-sync 129 | 130 | - name: Sync labels 131 | env: 132 | GITHUB_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }} 133 | run: | 134 | # See: https://github.com/Financial-Times/github-label-sync 135 | github-label-sync \ 136 | --labels "${{ env.MERGED_CONFIGURATION_PATH }}" \ 137 | ${{ steps.dry-run.outputs.flag }} \ 138 | ${{ github.repository }} 139 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU LESSER GENERAL PUBLIC LICENSE 2 | Version 2.1, February 1999 3 | 4 | Copyright (C) 1991, 1999 Free Software Foundation, Inc. 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | [This is the first released version of the Lesser GPL. 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See the GNU 484 | Lesser General Public License for more details. 485 | 486 | You should have received a copy of the GNU Lesser General Public 487 | License along with this library; if not, write to the Free Software 488 | Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 489 | USA 490 | 491 | Also add information on how to contact you by electronic and paper mail. 492 | 493 | You should also get your employer (if you work as a programmer) or your 494 | school, if any, to sign a "copyright disclaimer" for the library, if 495 | necessary. Here is a sample; alter the names: 496 | 497 | Yoyodyne, Inc., hereby disclaims all copyright interest in the 498 | library `Frob' (a library for tweaking knobs) written by James Random 499 | Hacker. 500 | 501 | , 1 April 1990 502 | Ty Coon, President of Vice 503 | 504 | That's all there is to it! 505 | -------------------------------------------------------------------------------- /README.adoc: -------------------------------------------------------------------------------- 1 | :repository-owner: arduino-libraries 2 | :repository-name: Audio 3 | 4 | = {repository-name} Library for Arduino = 5 | 6 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml/badge.svg["Check Arduino status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-arduino.yml"] 7 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml/badge.svg["Compile Examples status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/compile-examples.yml"] 8 | image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml/badge.svg["Spell Check status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/spell-check.yml"] 9 | 10 | The Audio library enables an Arduino Due board to play back .wav files from a storage device like an SD card. 11 | 12 | For more information about this library please visit us at 13 | http://www.arduino.cc/en/Reference/{repository-name} 14 | -------------------------------------------------------------------------------- /docs/api.md: -------------------------------------------------------------------------------- 1 | # Audio Library 2 | 3 | ## Methods 4 | 5 | ### `begin()` 6 | 7 | #### Description 8 | 9 | Initializes the Audio library by specifying the target sample rate and size of the audio buffer. 10 | 11 | 12 | #### Syntax 13 | 14 | Audio.begin(rate, size); 15 | 16 | 17 | #### Parameters 18 | 19 | rate (int) : the sample rate of the sound file. If stereo, double the rate (ex. 44100 Hz stereo = 88200). 20 | 21 | size (int) : the size of the audio buffer in milliseconds. 22 | 23 | 24 | #### Returns 25 | 26 | nothing 27 | 28 | 29 | #### Example 30 | 31 | ``` 32 | /* 33 | 34 | Demonstrates the use of the Audio library for the Arduino Due 35 | 36 | Hardware required : 37 | *Arduino shield with a SD card on CS 4 (the Ethernet shield will work) 38 | *Audio amplifier circuit with speaker attached to DAC0 39 | 40 | Original by Massimo Banzi September 20, 2012 41 | Modified by Scott Fitzgerald October 19, 2012 42 | 43 | */ 44 | 45 | #include 46 | #include 47 | #include 48 | 49 | void setup() 50 | { 51 | // debug output at 9600 baud 52 | Serial.begin(9600); 53 | 54 | // setup SD-card 55 | Serial.print("Initializing SD card..."); 56 | if (!SD.begin(4)) { 57 | Serial.println(" failed!"); 58 | return; 59 | } 60 | Serial.println(" done."); 61 | // hi-speed SPI transfers 62 | SPI.setClockDivider(4); 63 | 64 | // 44100 Hz stereo => 88200 sample rate 65 | // 100 mSec of prebuffering. 66 | Audio.begin(88200, 100); 67 | } 68 | 69 | void loop() 70 | { 71 | int count=0; 72 | 73 | // open wave file from sdcard 74 | File myFile = SD.open("test.wav"); 75 | if (!myFile) { 76 | // if the file didn't open, print an error and stop 77 | Serial.println("error opening test.wav"); 78 | while (true); 79 | } 80 | 81 | const int S=1024; // Number of samples to read in block 82 | short buffer[S]; 83 | 84 | Serial.print("Playing"); 85 | // until the file is not finished 86 | while (myFile.available()) { 87 | // read from the file into buffer 88 | myFile.read(buffer, sizeof(buffer)); 89 | 90 | // Prepare samples 91 | int volume = 1024; 92 | Audio.prepare(buffer, S, volume); 93 | // Feed samples to audio 94 | Audio.write(buffer, S); 95 | 96 | // Every 100 block print a '.' 97 | count++; 98 | if (count == 100) { 99 | Serial.print("."); 100 | count = 0; 101 | } 102 | } 103 | myFile.close(); 104 | 105 | Serial.println("End of file. Thank you for listening!"); 106 | while (true) ; 107 | } 108 | ``` 109 | 110 | ### `prepare()` 111 | 112 | #### Description 113 | 114 | Prepares audio samples from the named file to the audio buffer, and sets the volume. 115 | 116 | 117 | #### Syntax 118 | 119 | Audio.prepare(buffer, samples, volume); 120 | 121 | 122 | #### Parameters 123 | 124 | buffer (short) : the named buffer holding the audio file. 125 | 126 | samples (int) : number of samples to write 127 | 128 | volume (int) : a 10-bit number representing the volume of the audio being played. 0 turns the sound off, 1023 is the maximum volume. 129 | 130 | 131 | #### Returns 132 | 133 | nothing 134 | 135 | 136 | #### Example 137 | 138 | ``` 139 | /* 140 | 141 | Demonstrates the use of the Audio library for the Arduino Due 142 | 143 | Hardware required : 144 | *Arduino shield with a SD card on CS 4 (the Ethernet shield will work) 145 | *Audio amplifier circuit with speaker attached to DAC0 146 | 147 | Original by Massimo Banzi September 20, 2012 148 | Modified by Scott Fitzgerald October 19, 2012 149 | 150 | */ 151 | 152 | #include 153 | #include 154 | #include 155 | 156 | void setup() 157 | { 158 | // debug output at 9600 baud 159 | Serial.begin(9600); 160 | 161 | // setup SD-card 162 | Serial.print("Initializing SD card..."); 163 | if (!SD.begin(4)) { 164 | Serial.println(" failed!"); 165 | return; 166 | } 167 | Serial.println(" done."); 168 | // hi-speed SPI transfers 169 | SPI.setClockDivider(4); 170 | 171 | // 44100 Hz stereo => 88200 sample rate 172 | // 100 mSec of prebuffering. 173 | Audio.begin(88200, 100); 174 | } 175 | 176 | void loop() 177 | { 178 | int count=0; 179 | 180 | // open wave file from sdcard 181 | File myFile = SD.open("test.wav"); 182 | if (!myFile) { 183 | // if the file didn't open, print an error and stop 184 | Serial.println("error opening test.wav"); 185 | while (true); 186 | } 187 | 188 | const int S=1024; // Number of samples to read in block 189 | short buffer[S]; 190 | 191 | Serial.print("Playing"); 192 | // until the file is not finished 193 | while (myFile.available()) { 194 | // read from the file into buffer 195 | myFile.read(buffer, sizeof(buffer)); 196 | 197 | // Prepare samples 198 | int volume = 1024; 199 | Audio.prepare(buffer, S, volume); 200 | // Feed samples to audio 201 | Audio.write(buffer, S); 202 | 203 | // Every 100 block print a '.' 204 | count++; 205 | if (count == 100) { 206 | Serial.print("."); 207 | count = 0; 208 | } 209 | } 210 | myFile.close(); 211 | 212 | Serial.println("End of file. Thank you for listening!"); 213 | while (true) ; 214 | } 215 | ``` 216 | 217 | ### `write()` 218 | 219 | #### Description 220 | 221 | Writes an audio signal from a buffer to DAC0 and DAC1. 222 | 223 | 224 | #### Syntax 225 | 226 | Audio.write(buffer, length); 227 | 228 | 229 | #### Parameters 230 | 231 | buffer (short) : the named buffer with the audio file. 232 | 233 | length (int) : number of samples to write 234 | 235 | 236 | #### Returns 237 | 238 | nothing 239 | 240 | 241 | #### Example 242 | 243 | ``` 244 | /* 245 | 246 | Demonstrates the use of the Audio library for the Arduino Due 247 | 248 | Hardware required : 249 | *Arduino shield with a SD card on CS 4 (the Ethernet shield will work) 250 | *Audio amplifier circuit with speaker attached to DAC0 251 | 252 | Original by Massimo Banzi September 20, 2012 253 | Modified by Scott Fitzgerald October 19, 2012 254 | 255 | */ 256 | 257 | #include 258 | #include 259 | #include 260 | 261 | void setup() 262 | { 263 | // debug output at 9600 baud 264 | Serial.begin(9600); 265 | 266 | // setup SD-card 267 | Serial.print("Initializing SD card..."); 268 | if (!SD.begin(4)) { 269 | Serial.println(" failed!"); 270 | return; 271 | } 272 | Serial.println(" done."); 273 | // hi-speed SPI transfers 274 | SPI.setClockDivider(4); 275 | 276 | // 44100 Hz stereo => 88200 sample rate 277 | // 100 mSec of prebuffering. 278 | Audio.begin(88200, 100); 279 | } 280 | 281 | void loop() 282 | { 283 | int count=0; 284 | 285 | // open wave file from sdcard 286 | File myFile = SD.open("test.wav"); 287 | if (!myFile) { 288 | // if the file didn't open, print an error and stop 289 | Serial.println("error opening test.wav"); 290 | while (true); 291 | } 292 | 293 | const int S=1024; // Number of samples to read in block 294 | short buffer[S]; 295 | 296 | Serial.print("Playing"); 297 | // until the file is not finished 298 | while (myFile.available()) { 299 | // read from the file into buffer 300 | myFile.read(buffer, sizeof(buffer)); 301 | 302 | // Prepare samples 303 | int volume = 1024; 304 | Audio.prepare(buffer, S, volume); 305 | // Feed samples to audio 306 | Audio.write(buffer, S); 307 | 308 | // Every 100 block print a '.' 309 | count++; 310 | if (count == 100) { 311 | Serial.print("."); 312 | count = 0; 313 | } 314 | } 315 | myFile.close(); 316 | 317 | Serial.println("End of file. Thank you for listening!"); 318 | while (true) ; 319 | } 320 | ``` 321 | -------------------------------------------------------------------------------- /docs/readme.md: -------------------------------------------------------------------------------- 1 | **Compatible with Arduino Due only** 2 | 3 | The Audio library enables an Arduino Due board to play back .wav files from a storage device like an SD card. 4 | 5 | The Due uses the DAC0 and DAC1 pins to play sounds. 6 | 7 | To use this library: 8 | 9 | ``` 10 | #include 11 | ``` 12 | 13 | > The Audio library and associated functions are experimental. While it is not likely the API will change in future releases, it is still under development. -------------------------------------------------------------------------------- /examples/SimpleAudioPlayer/SimpleAudioPlayer.ino: -------------------------------------------------------------------------------- 1 | /* 2 | Simple Audio Player 3 | 4 | Demonstrates the use of the Audio library for the Arduino Due 5 | 6 | Hardware required : 7 | * Arduino shield with a SD card on CS4 8 | * A sound file named "test.wav" in the root directory of the SD card 9 | * An audio amplifier to connect to the DAC0 and ground 10 | * A speaker to connect to the audio amplifier 11 | 12 | Original by Massimo Banzi September 20, 2012 13 | Modified by Scott Fitzgerald October 19, 2012 14 | Modified by Arturo Guadalupi December 18, 2015 15 | 16 | This example code is in the public domain 17 | 18 | http://www.arduino.cc/en/Tutorial/SimpleAudioPlayer 19 | 20 | */ 21 | 22 | #include 23 | #include 24 | #include 25 | 26 | void setup() { 27 | // debug output at 9600 baud 28 | Serial.begin(9600); 29 | 30 | // setup SD-card 31 | Serial.print("Initializing SD card..."); 32 | if (!SD.begin(4)) { 33 | Serial.println(" failed!"); 34 | while(true); 35 | } 36 | Serial.println(" done."); 37 | // hi-speed SPI transfers 38 | 39 | // 44100 Hz stereo => 88200 Hz sample rate 40 | // 100 mSec of prebuffering. 41 | } 42 | 43 | void loop() { 44 | int count = 0; 45 | 46 | // open wave file from SD card 47 | File myFile = SD.open("test.wav"); 48 | Audio.begin(88200, 100); 49 | if (!myFile) { 50 | // if the file didn't open, print an error and stop 51 | Serial.println("error opening test.wav"); 52 | while (true); 53 | } 54 | 55 | const int S = 1024; // Number of samples to read in block 56 | short buffer[S]; 57 | 58 | Serial.print("Playing"); 59 | // until the file is finished 60 | while (myFile.available()) { 61 | // read from the file into buffer 62 | myFile.read(buffer, sizeof(buffer)); 63 | 64 | // Prepare samples 65 | int volume = 1024; 66 | Audio.prepare(buffer, S, volume); 67 | // Feed samples to audio 68 | Audio.write(buffer, S); 69 | 70 | // Every 100 blocks print a '.' 71 | count++; 72 | if (count == 100) { 73 | Serial.print("."); 74 | count = 0; 75 | } 76 | } 77 | myFile.close(); 78 | Audio.end(); 79 | Serial.println("End of file. Thank you for listening!"); 80 | while (true) ; 81 | } 82 | -------------------------------------------------------------------------------- /keywords.txt: -------------------------------------------------------------------------------- 1 | ####################################### 2 | # Syntax Coloring Map For Audio 3 | ####################################### 4 | 5 | ####################################### 6 | # Datatypes (KEYWORD1) 7 | ####################################### 8 | 9 | Audio KEYWORD1 Audio 10 | 11 | ####################################### 12 | # Methods and Functions (KEYWORD2) 13 | ####################################### 14 | 15 | prepare KEYWORD2 16 | write KEYWORD2 17 | 18 | ####################################### 19 | # Constants (LITERAL1) 20 | ####################################### 21 | 22 | -------------------------------------------------------------------------------- /library.properties: -------------------------------------------------------------------------------- 1 | name=Audio 2 | version=1.0.6 3 | author=Arduino 4 | maintainer=Arduino 5 | sentence=Allows playing audio files from an SD card. For Arduino Due only. 6 | paragraph=With this library you can use the Arduino Due's DAC outputs to play audio files.
The audio files must be in the raw .wav format. 7 | category=Signal Input/Output 8 | url=http://www.arduino.cc/en/Reference/Audio 9 | architectures=sam 10 | -------------------------------------------------------------------------------- /src/Audio.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2012 Arduino LLC. All right reserved. 3 | * Audio library for Arduino Due. 4 | * 5 | * This file is free software; you can redistribute it and/or modify 6 | * it under the terms of either the GNU General Public License version 2 7 | * or the GNU Lesser General Public License version 2.1, both as 8 | * published by the Free Software Foundation. 9 | */ 10 | 11 | #include "Audio.h" 12 | 13 | void AudioClass::begin(uint32_t sampleRate, uint32_t msPreBuffer) { 14 | // Allocate a buffer to keep msPreBuffer milliseconds of audio 15 | bufferSize = msPreBuffer * sampleRate / 1000; 16 | if (bufferSize < 1024) 17 | bufferSize = 1024; 18 | buffer = (uint32_t *) malloc(bufferSize * sizeof(uint32_t)); 19 | half = buffer + bufferSize / 2; 20 | last = buffer + bufferSize; 21 | 22 | // Buffering starts from the beginning 23 | running = buffer; 24 | next = buffer; 25 | 26 | // Start DAC 27 | dac->begin(VARIANT_MCK / sampleRate); 28 | dac->setOnTransmitEnd_CB(onTransmitEnd, this); 29 | } 30 | 31 | void AudioClass::end() { 32 | dac->end(); 33 | free( buffer); 34 | } 35 | 36 | void AudioClass::prepare(int16_t *buffer, int S, int volume){ 37 | uint16_t *ubuffer = (uint16_t*) buffer; 38 | for (int i=0; i>= 4; 44 | } 45 | } 46 | 47 | size_t AudioClass::write(const uint32_t *data, size_t size) { 48 | const uint32_t TAG = 0x10000000; 49 | int i; 50 | for (i = 0; i < size; i++) { 51 | *next = data[i] | TAG; 52 | next++; 53 | 54 | if (next == half || next == last) { 55 | enqueue(); 56 | while (next == running) 57 | ; 58 | } 59 | } 60 | 61 | return i; 62 | } 63 | 64 | void AudioClass::enqueue() { 65 | if (!dac->canQueue()) { 66 | // DMA queue full 67 | return; 68 | } 69 | 70 | if (next == half) { 71 | // Enqueue the first half 72 | dac->queueBuffer(buffer, bufferSize / 2); 73 | } else { 74 | // Enqueue the second half 75 | dac->queueBuffer(half, bufferSize / 2); 76 | next = buffer; // wrap around 77 | } 78 | } 79 | 80 | void AudioClass::onTransmitEnd(void *_me) { 81 | AudioClass *me = reinterpret_cast (_me); 82 | if (me->running == me->buffer) 83 | me->running = me->half; 84 | else 85 | me->running = me->buffer; 86 | } 87 | 88 | AudioClass Audio(DAC); 89 | -------------------------------------------------------------------------------- /src/Audio.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2012 Arduino LLC. All right reserved. 3 | * Audio library for Arduino Due. 4 | * 5 | * This file is free software; you can redistribute it and/or modify 6 | * it under the terms of either the GNU General Public License version 2 7 | * or the GNU Lesser General Public License version 2.1, both as 8 | * published by the Free Software Foundation. 9 | */ 10 | 11 | #ifndef AUDIO_H 12 | #define AUDIO_H 13 | 14 | #include "Arduino.h" 15 | #include "Print.h" 16 | #include "DAC.h" 17 | 18 | class AudioClass : public Print { 19 | public: 20 | AudioClass(DACClass &_dac) : dac(&_dac) { }; 21 | void prepare(int16_t *buffer, int S, int volume); 22 | void begin(uint32_t sampleRate, uint32_t msPreBuffer); 23 | void end(); 24 | 25 | virtual size_t write(uint8_t c) { /* not implemented */ }; 26 | virtual size_t write(const uint8_t *data, size_t size) { return write(reinterpret_cast(data), size/4) * 4; }; 27 | virtual size_t write(const uint16_t *data, size_t size) { return write(reinterpret_cast(data), size/2) * 2; }; 28 | virtual size_t write(const int16_t *data, size_t size) { return write(reinterpret_cast(data), size/2) * 2; }; 29 | virtual size_t write(const uint32_t *data, size_t size); 30 | 31 | void debug() { 32 | // Serial1.print(running-buffer, DEC); 33 | // Serial1.print(" "); 34 | // Serial1.print(current-buffer, DEC); 35 | // Serial1.print(" "); 36 | // Serial1.print(next-buffer, DEC); 37 | // Serial1.print(" "); 38 | // Serial1.println(last-buffer, DEC); 39 | } 40 | private: 41 | void enqueue(); 42 | static void onTransmitEnd(void *me); 43 | uint32_t bufferSize; 44 | uint32_t *buffer; 45 | uint32_t *half; 46 | uint32_t *last; 47 | uint32_t *volatile running; 48 | uint32_t *volatile next; 49 | 50 | uint32_t *cook(const uint32_t *buffer, size_t size); 51 | 52 | DACClass *dac; 53 | }; 54 | 55 | extern AudioClass Audio; 56 | 57 | #endif 58 | -------------------------------------------------------------------------------- /src/DAC.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2012 Arduino LLC. All right reserved. 3 | * DAC library for Arduino Due. 4 | * 5 | * This file is free software; you can redistribute it and/or modify 6 | * it under the terms of either the GNU General Public License version 2 7 | * or the GNU Lesser General Public License version 2.1, both as 8 | * published by the Free Software Foundation. 9 | */ 10 | 11 | #include 12 | 13 | void DACClass::begin(uint32_t period) { 14 | // Enable clock for DAC 15 | pmc_enable_periph_clk(dacId); 16 | 17 | dacc_reset(dac); 18 | 19 | // Set transfer mode to double word 20 | dacc_set_transfer_mode(dac, 1); 21 | 22 | // Power save: 23 | // sleep mode - 0 (disabled) 24 | // fast wakeup - 0 (disabled) 25 | dacc_set_power_save(dac, 0, 0); 26 | 27 | // DAC refresh/startup timings: 28 | // refresh - 0x08 (1024*8 dacc clocks) 29 | // max speed mode - 0 (disabled) 30 | // startup time - 0x10 (1024 dacc clocks) 31 | dacc_set_timing(dac, 0x08, 0, DACC_MR_STARTUP_1024); 32 | 33 | // Flexible channel selection with tags 34 | dacc_enable_flexible_selection(dac); 35 | 36 | // Set up analog current 37 | dacc_set_analog_control(dac, 38 | DACC_ACR_IBCTLCH0(0x02) | 39 | DACC_ACR_IBCTLCH1(0x02) | 40 | DACC_ACR_IBCTLDACCORE(0x01)); 41 | 42 | // Enable output channels 43 | dacc_enable_channel(dac, 0); 44 | dacc_enable_channel(dac, 1); 45 | 46 | // Configure Timer Counter to trigger DAC 47 | // -------------------------------------- 48 | pmc_enable_periph_clk(ID_TC1); 49 | TC_Configure(TC0, 1, 50 | TC_CMR_TCCLKS_TIMER_CLOCK2 | // Clock at MCR/8 51 | TC_CMR_WAVE | // Waveform mode 52 | TC_CMR_WAVSEL_UP_RC | // Counter running up and reset when equals to RC 53 | TC_CMR_ACPA_SET | TC_CMR_ACPC_CLEAR); 54 | const uint32_t TC = period / 8; 55 | TC_SetRA(TC0, 1, TC / 2); 56 | TC_SetRC(TC0, 1, TC); 57 | TC_Start(TC0, 1); 58 | 59 | // Configure clock source for DAC (2 = TC0 Output Chan. 1) 60 | dacc_set_trigger(dac, 2); 61 | 62 | // Configure pins 63 | PIO_Configure(g_APinDescription[DAC0].pPort, 64 | g_APinDescription[DAC0].ulPinType, 65 | g_APinDescription[DAC0].ulPin, 66 | g_APinDescription[DAC0].ulPinConfiguration); 67 | PIO_Configure(g_APinDescription[DAC1].pPort, 68 | g_APinDescription[DAC1].ulPinType, 69 | g_APinDescription[DAC1].ulPin, 70 | g_APinDescription[DAC1].ulPinConfiguration); 71 | 72 | // Enable interrupt controller for DAC 73 | dacc_disable_interrupt(dac, 0xFFFFFFFF); 74 | NVIC_DisableIRQ(isrId); 75 | NVIC_ClearPendingIRQ(isrId); 76 | NVIC_SetPriority(isrId, 0); 77 | NVIC_EnableIRQ(isrId); 78 | } 79 | 80 | void DACClass::end() { 81 | TC_Stop(TC0, 1); 82 | NVIC_DisableIRQ(isrId); 83 | dacc_disable_channel(dac, 0); 84 | dacc_disable_channel(dac, 1); 85 | } 86 | 87 | bool DACClass::canQueue() { 88 | return (dac->DACC_TNCR == 0); 89 | } 90 | 91 | size_t DACClass::queueBuffer(const uint32_t *buffer, size_t size) { 92 | // Try the first PDC buffer 93 | if ((dac->DACC_TCR == 0) && (dac->DACC_TNCR == 0)) { 94 | dac->DACC_TPR = (uint32_t) buffer; 95 | dac->DACC_TCR = size; 96 | dac->DACC_PTCR = DACC_PTCR_TXTEN; 97 | if (cb) 98 | dacc_enable_interrupt(dac, DACC_IER_ENDTX); 99 | return size; 100 | } 101 | 102 | // Try the second PDC buffer 103 | if (dac->DACC_TNCR == 0) { 104 | dac->DACC_TNPR = (uint32_t) buffer; 105 | dac->DACC_TNCR = size; 106 | dac->DACC_PTCR = DACC_PTCR_TXTEN; 107 | if (cb) 108 | dacc_enable_interrupt(dac, DACC_IER_ENDTX); 109 | return size; 110 | } 111 | 112 | // PDC buffers full, try again later... 113 | return 0; 114 | } 115 | 116 | void DACClass::setOnTransmitEnd_CB(OnTransmitEnd_CB _cb, void *_data) { 117 | cb = _cb; 118 | cbData = _data; 119 | if (!cb) 120 | dacc_disable_interrupt(dac, DACC_IDR_ENDTX); 121 | } 122 | 123 | void DACClass::onService() { 124 | uint32_t sr = dac->DACC_ISR; 125 | if (sr & DACC_ISR_ENDTX) { 126 | // There is a free slot, enqueue data 127 | dacc_disable_interrupt(dac, DACC_IDR_ENDTX); 128 | if (cb) 129 | cb(cbData); 130 | } 131 | } 132 | 133 | DACClass DAC(DACC_INTERFACE, DACC_INTERFACE_ID, DACC_ISR_ID); 134 | 135 | void DACC_ISR_HANDLER(void) { 136 | DAC.onService(); 137 | } 138 | 139 | -------------------------------------------------------------------------------- /src/DAC.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright (c) 2012 Arduino LLC. All right reserved. 3 | * DAC library for Arduino Due. 4 | * 5 | * This file is free software; you can redistribute it and/or modify 6 | * it under the terms of either the GNU General Public License version 2 7 | * or the GNU Lesser General Public License version 2.1, both as 8 | * published by the Free Software Foundation. 9 | */ 10 | 11 | #ifndef DAC_INCLUDED 12 | #define DAC_INCLUDED 13 | 14 | #include "Arduino.h" 15 | 16 | typedef void (*OnTransmitEnd_CB)(void *data); 17 | 18 | class DACClass 19 | { 20 | public: 21 | DACClass(Dacc *_dac, uint32_t _dacId, IRQn_Type _isrId) : 22 | dac(_dac), dacId(_dacId), isrId(_isrId), cb(NULL) { }; 23 | void begin(uint32_t period); 24 | void end(); 25 | bool canQueue(); 26 | size_t queueBuffer(const uint32_t *buffer, size_t size); 27 | uint32_t *getCurrentQueuePointer(); 28 | void setOnTransmitEnd_CB(OnTransmitEnd_CB _cb, void *data); 29 | void onService(); 30 | 31 | void enableInterrupts() { NVIC_EnableIRQ(isrId); }; 32 | void disableInterrupts() { NVIC_DisableIRQ(isrId); }; 33 | 34 | private: 35 | Dacc *dac; 36 | uint32_t dacId; 37 | IRQn_Type isrId; 38 | OnTransmitEnd_CB cb; 39 | void *cbData; 40 | }; 41 | 42 | extern DACClass DAC; 43 | 44 | #endif 45 | --------------------------------------------------------------------------------