├── LICENSE ├── README.md ├── SamdAudio.cpp ├── SamdAudio.h ├── audio ├── piano8bit_22khz.wav ├── poem8bit_32khz.wav ├── sfx1_8bit_22khz.wav ├── sfx1_8bit_32khz.wav ├── sfx2_8bit_22khz.wav ├── sfx2_8bit_32khz.wav ├── sfx3_8bit_22khz.wav ├── sfx3_8bit_32khz.wav ├── sfx4_8bit_22khz.wav └── sfx4_8bit_32khz.wav ├── examples ├── play_wav_from_FLASH │ └── play_wav_from_FLASH.ino └── play_wav_from_SD_card │ └── play_wav_from_SD_card.ino ├── library.properties ├── library_modification_SD_card.JPG ├── library_modification_flash.JPG └── screen_shot.JPG /LICENSE: -------------------------------------------------------------------------------- 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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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 | {signature of Ty Coon}, 1 April 1990 502 | Ty Coon, President of Vice 503 | 504 | That's all there is to it! 505 | 506 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ### Arduino Audio Library for Arduino SAMD21 2 | 3 | 4 | #### Update... an Adafruit dependency Adafruit_SPIFlash_FatFs.h is not longer available... look to some folks that have forked this repo like [gambalunga](https://github.com/Gambalunga/Audio_FeatherM0) who got it working using the updated Adafruit library. 5 | 6 | This polyphonic library allows you to play WAV files from SPI Flash and SD card to the 10bit DAC of a SAMD21 (Pin A0 on many boards). 7 | Plays up to ~4 WAV files simultaneously. 8 | [![IMAGE ALT TEXT](https://github.com/hydronics2/SamdAudio/blob/master/screen_shot.JPG)](https://youtu.be/A0afENS1ev4 "Playing polyphonic") 9 | 10 | Adafruit has a nice tutorial on how to connect the pin to a 1/8" audio jack. The hookup [instructions are here](https://learn.adafruit.com/circuitpython-essentials/circuitpython-audio-out) (ignore the circiut python example as this library is for an Arduino sketch). 11 | ![Adafruit image](https://cdn-learn.adafruit.com/assets/assets/000/057/479/original/circuitpython_ItsyBitsyM0AudioJackButtonPot_bb.jpg?1531328765) 12 | 13 | The 8bit sound quality is medium quality. I was able to get up to 44.1khz using SPI flash on the Adafruit M0 boards. The quality needed to be reduced to ~22khz when playing from the SD card. 14 | 15 | It all sounds fairly marginal at 8bit. Until there is a library with 16bit DMA output, I recommend going with a [Teensy](https://www.pjrc.com/teensy/td_libs_Audio.html) or a peripherial codec to do the heavy lifting of playing quality audio.... but hey this all sounds better than the Arduino UNO. 16 | 17 | The following Adafruit Express boards have onboard FLASH where you can store up to 2MB of sound ~30-60seconds. 18 | This includes: 19 | * [Itsybits M0 Express](https://www.adafruit.com/product/3727) (tested) 20 | * [Adafruit Metro M0 Express](https://www.adafruit.com/product/3505) 21 | * [Trinket M0 Express](https://www.adafruit.com/product/3500) and Gemma Express no SPI Flash so SD card playing only. 22 | * Adafruit M4 Express boards with the SAMD51? should work 23 | 24 | 25 | Read this great description in the Adafruit tutorial for getting the WAV files onto your Adafruit M0 Express board 26 | https://learn.adafruit.com/introducing-itsy-bitsy-m0?view=all#using-spi-flash 27 | Thanks to Tony Dicola and Adafruit for making this so easy! 28 | 29 | For the SD card example, these lines need to be edited in SamdAudio.cpp 30 | 31 | ![edits sd](https://github.com/hydronics2/SamdAudio/blob/master/library_modification_SD_card.JPG) 32 | 33 | To revert back to playing WAV files from flash storage example goes like this in SamdAudio.cpp: 34 | 35 | ![edits flash](https://github.com/hydronics2/SamdAudio/blob/master/library_modification_flash.JPG) 36 | 37 | 38 | Flash example included in the examples folder. See also SD Card Example: 39 | 40 | /* 41 | 42 | Audio player, non blocking. 43 | read 8bit mono .wav file, up to 4 channels 44 | use Audacity to convert your audio file 45 | Author : AloyseTech 46 | 47 | 03/17/19: https://github.com/hydronics2/SamdAudio 48 | updated to work with Adafruit Qaud Flash memory boards. 49 | This will work with any SAMD21 chip using SPI flash with a little tinkering 50 | - itsyBitsy M0 Express, 51 | - Feather M0 Express, 52 | - probalby M4 of abovev and trinkets 53 | 54 | Read this great description in the Adafruit tutorial for getting the WAV files onto your Adafruit M0 Express board 55 | https://learn.adafruit.com/introducing-itsy-bitsy-m0?view=all#using-spi-flash 56 | Thanks to Tondy Dicola and Adafruit for making this so easy! 57 | 58 | if the sketch compiles and Initializes Audio player, but no sound, look in SamdAudio.cpp and umcomment these! 59 | - #include 60 | - #include 61 | - extern Adafruit_W25Q16BV_FatFs memory; 62 | 63 | */ 64 | 65 | #include 66 | 67 | #include 68 | #include 69 | 70 | #define FLASH_TYPE SPIFLASHTYPE_W25Q16BV // Flash chip type. 71 | // If you change this be 72 | // sure to change the fatfs 73 | // object type below to match. 74 | 75 | #define FLASH_SS SS1 // Flash chip SS pin. 76 | #define FLASH_SPI_PORT SPI1 // What SPI port is Flash on? 77 | 78 | Adafruit_SPIFlash flash(FLASH_SS, &FLASH_SPI_PORT); // Use hardware SPI 79 | 80 | // Finally create an Adafruit_M0_Express_CircuitPython object which gives 81 | // an SD card-like interface to interacting with files stored in CircuitPython's 82 | // flash filesystem. 83 | 84 | Adafruit_W25Q16BV_FatFs memory(flash); 85 | 86 | #include // 87 | SamdAudio AudioPlayer; 88 | 89 | #define NUM_AUDIO_CHANNELS 4 //could be 1,2 or 4 for sound 90 | 91 | #define AUDIO_BUFFER_SIZE 1024 //512 works fine for 22.05kh, use 1024 for 32khz and 44.1khz 92 | 93 | //indicate sample rate here (use audacity to convert your wav) 94 | const unsigned int sampleRate = 32000; //hz 95 | 96 | //your wav file 97 | const char *filename0 = "poem8bit_32khz.wav"; 98 | const char *filename1 = "sfx1_8bit_32khz.wav"; 99 | const char *filename2 = "sfx2_8bit_32khz.wav"; 100 | const char *filename3 = "sfx3_8bit_32khz.wav"; 101 | const char *filename4 = "sfx4_8bit_32khz.wav"; 102 | 103 | void setup() 104 | { 105 | delay(10); 106 | Serial.begin(115200); 107 | while (!Serial); // open the serial to start! 108 | 109 | // Initialize flash library and check its chip ID. 110 | if (!flash.begin(FLASH_TYPE)) 111 | { 112 | Serial.println("Error, failed to initialize flash chip!"); 113 | while(1); 114 | } 115 | Serial.print("Flash chip JEDEC ID: 0x"); Serial.println(flash.GetJEDECID(), HEX); 116 | // First call begin to mount the filesystem. Check that it returns true 117 | // to make sure the filesystem was mounted. 118 | if (!memory.begin()) 119 | { 120 | Serial.println("Error, failed to mount filesystem!"); 121 | while(1); 122 | } 123 | Serial.println("Mounted filesystem!"); 124 | 125 | Serial.print("Initializing Audio Player..."); 126 | if (AudioPlayer.begin(sampleRate, NUM_AUDIO_CHANNELS, AUDIO_BUFFER_SIZE) == -1) 127 | { 128 | Serial.println(" failed!"); 129 | return; 130 | } 131 | Serial.println(" done."); 132 | 133 | AudioPlayer.play(filename0, 1); 134 | 135 | Serial.println("Playing file....."); 136 | } 137 | 138 | 139 | void loop() 140 | { 141 | if (Serial.available()) 142 | { 143 | char c = Serial.read(); 144 | Serial.println(c); //for debug 145 | 146 | if ( c == 'o') 147 | { 148 | AudioPlayer.play(filename1, 0); //playing file on channel 0 149 | Serial.println("playing audio file on channel 0"); 150 | } 151 | if ( c == 'p') 152 | { 153 | AudioPlayer.play(filename2, 1); //playing file on channel 1 154 | Serial.println("playing audio file on channel 1"); 155 | } 156 | if ( c == 'k') 157 | { 158 | AudioPlayer.play(filename3, 2); //playing file on channel 2 159 | Serial.println("playing audio file on channel 2"); 160 | } 161 | if ( c == 'l') 162 | { 163 | AudioPlayer.play(filename4, 3); //playing file on channel 3 164 | Serial.println("playing audio file on channel 3"); 165 | } 166 | } 167 | } 168 | 169 | 170 | 171 | -------------------------------------------------------------------------------- /SamdAudio.cpp: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (c) 2016 Th�o Meyer aka AloyseTech. All right reserved. 3 | 4 | This library is free software; you can redistribute it and/or 5 | modify it under the terms of the GNU Lesser General Public 6 | License as published by the Free Software Foundation; either 7 | version 3 of the License, or (at your option) any later version. 8 | 9 | This library is distributed in the hope that it will be useful, 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 12 | See the GNU Lesser General Public License for more details. 13 | 14 | You should have received a copy of the GNU Lesser General Public 15 | License along with this library; if not, write to the Free Software 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 | */ 18 | 19 | #include "SamdAudio.h" 20 | 21 | //for using flash memory as WAV file storage 22 | #include 23 | #include 24 | extern Adafruit_W25Q16BV_FatFs memory; 25 | 26 | //for using SD card as WAV file storage 27 | //#include 28 | //extern SdFat memory; 29 | 30 | //********************************************************************* 31 | //Global variables 32 | File __audioFile[MAX_N_CHANNELS]; 33 | volatile bool __audioPlaying[MAX_N_CHANNELS]={false}; 34 | volatile bool __audioFileReady[MAX_N_CHANNELS] = {false}; 35 | volatile uint32_t __SampleIndex[MAX_N_CHANNELS]; 36 | uint8_t __WavSamples[MAX_N_CHANNELS][2][MAX_AUDIO_BUFFER_SIZE]; 37 | uint8_t rampDivisor[MAX_N_CHANNELS]={1}; 38 | uint8_t whichBuffer[MAX_N_CHANNELS]={0}; 39 | volatile bool fillNextBuffer[MAX_N_CHANNELS]={true}; 40 | volatile uint16_t __audioData; 41 | 42 | 43 | int __Volume; 44 | bool __criticalSection = false; 45 | 46 | int __numOfChannelsUsed = 4; 47 | int __audioBufferSize = 1024; 48 | 49 | // unused declarations, commented out 50 | void TC5_Handler (void) __attribute__ ((weak, alias("AudioPlay_Handler"))); 51 | void TC3_Handler (void) __attribute__ ((weak, alias("AudioRead_Handler"))); 52 | 53 | 54 | //********************************************************************* 55 | 56 | 57 | int SamdAudio::begin(uint32_t sampleRate, uint8_t numOfChannels, uint16_t audio_buffer_size) 58 | { 59 | __audioBufferSize = audio_buffer_size; 60 | 61 | 62 | if(numOfChannels == 1 || numOfChannels == 2 || numOfChannels == 4) 63 | { 64 | // initialize the global variable with the channels to use 65 | __numOfChannelsUsed = numOfChannels; 66 | } 67 | else 68 | { 69 | // bad input passed, assume all 4 channels to be safe 70 | __numOfChannelsUsed = 4; 71 | } 72 | 73 | // initialize arrays 74 | for(uint8_t index=0; index=0 && c<__numOfChannelsUsed) //unsigned, cant be less than zero 99 | if(c<__numOfChannelsUsed) 100 | { 101 | __audioFileReady[c]=false; 102 | __audioFile[c].close(); 103 | __SampleIndex[c]=0; 104 | __audioPlaying[c]=false; 105 | } 106 | } 107 | 108 | void SamdAudio::play(const char *fname, uint8_t channel) { 109 | 110 | //if(channel<0 || channel>=__numOfChannelsUsed)//unsigned, cant be negative 111 | if(channel>=__numOfChannelsUsed) 112 | return; 113 | 114 | disableReaderTimer(); 115 | if(__audioFileReady[channel]) 116 | __audioFile[channel].close(); 117 | __audioFile[channel] = memory.open(fname); 118 | if(!__audioFile[channel]){ 119 | //end(); 120 | //SerialUSB.println("Error opening file"); 121 | return; 122 | } 123 | 124 | 125 | whichBuffer[channel]=0; 126 | fillNextBuffer[channel]=1; 127 | 128 | __audioFile[channel].read(__WavSamples[channel][whichBuffer[channel]], __audioBufferSize); 129 | 130 | __SampleIndex[channel]=0; 131 | __audioFileReady[channel] = true; 132 | 133 | rampDivisor[channel]=RAMPIN; 134 | 135 | /*once the buffer is filled for the first time the counter can be started*/ 136 | if(alonePlaying(channel)) 137 | { 138 | enablePlayerTimer(); 139 | } 140 | __audioPlaying[channel]=true; 141 | 142 | enableReaderTimer(); 143 | } 144 | 145 | bool SamdAudio::alonePlaying(uint8_t channel) 146 | { 147 | for(uint8_t index=0; index<__numOfChannelsUsed; index++) 148 | { 149 | if(index!=channel && __audioPlaying[index]) 150 | return false; 151 | } 152 | return true; 153 | } 154 | 155 | bool __channelsPlaying() 156 | { 157 | for(uint8_t index=0; index<__numOfChannelsUsed; index++) 158 | { 159 | if(__audioPlaying[index]) 160 | return true; 161 | } 162 | return false; 163 | } 164 | 165 | /** 166 | * Configures the DAC in event triggered mode. 167 | * 168 | * Configures the DAC to use the module's default configuration, with output 169 | * channel mode configured for event triggered conversions. 170 | */ 171 | void SamdAudio::dacConfigure(void){ 172 | analogWriteResolution(10); 173 | // analogWrite(A0, 0); 174 | 175 | DAC->CTRLA.bit.ENABLE = 0x01; 176 | DAC->DATA.reg = 0; 177 | while (DAC->STATUS.bit.SYNCBUSY == 1); 178 | } 179 | 180 | /** 181 | * Configures the TC to generate output events at the sample frequency. 182 | * 183 | * Configures the TC in Frequency Generation mode, with an event output once 184 | * each time the audio sample frequency period expires. 185 | */ 186 | void SamdAudio::configurePlayerTimer(uint32_t sampleRate) 187 | { 188 | // Enable GCLK for TCC2 and TC5 (timer counter input clock) 189 | GCLK->CLKCTRL.reg = (uint16_t) (GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN_GCLK0 | GCLK_CLKCTRL_ID(GCM_TC4_TC5)) ; 190 | while (GCLK->STATUS.bit.SYNCBUSY); 191 | 192 | resetPlayerTimer(); 193 | 194 | // Set Timer counter Mode to 16 bits 195 | TC5->COUNT16.CTRLA.reg |= TC_CTRLA_MODE_COUNT16; 196 | 197 | // Set TC5 mode as match frequency 198 | TC5->COUNT16.CTRLA.reg |= TC_CTRLA_WAVEGEN_MFRQ; 199 | 200 | TC5->COUNT16.CTRLA.reg |= TC_CTRLA_PRESCALER_DIV1 | TC_CTRLA_ENABLE; 201 | 202 | TC5->COUNT16.CC[0].reg = (uint16_t) (SystemCoreClock / sampleRate - 1); 203 | while (syncPlayerTimer()); 204 | 205 | // Configure interrupt request 206 | NVIC_DisableIRQ(TC5_IRQn); 207 | NVIC_ClearPendingIRQ(TC5_IRQn); 208 | NVIC_SetPriority(TC5_IRQn, 0); 209 | NVIC_EnableIRQ(TC5_IRQn); 210 | 211 | // Enable the TC5 interrupt request 212 | TC5->COUNT16.INTENSET.bit.MC0 = 1; 213 | while (syncPlayerTimer()); 214 | } 215 | 216 | 217 | bool SamdAudio::syncPlayerTimer() 218 | { 219 | return TC5->COUNT16.STATUS.reg & TC_STATUS_SYNCBUSY; 220 | } 221 | 222 | void SamdAudio::enablePlayerTimer() 223 | { 224 | // Enable TC 225 | TC5->COUNT16.CTRLA.reg |= TC_CTRLA_ENABLE; 226 | while (syncPlayerTimer()); 227 | } 228 | 229 | void SamdAudio::resetPlayerTimer() 230 | { 231 | // Reset TCx 232 | TC5->COUNT16.CTRLA.reg = TC_CTRLA_SWRST; 233 | while (syncPlayerTimer()); 234 | while (TC5->COUNT16.CTRLA.bit.SWRST); 235 | } 236 | 237 | void SamdAudio::disablePlayerTimer() 238 | { 239 | // Disable TC5 240 | TC5->COUNT16.CTRLA.reg &= ~TC_CTRLA_ENABLE; 241 | while (syncPlayerTimer()); 242 | } 243 | 244 | 245 | void SamdAudio::criticalON() { 246 | __criticalSection = true; 247 | } 248 | 249 | void SamdAudio::criticalOFF() { 250 | __criticalSection = false; 251 | } 252 | 253 | //SamdAudio AudioPlayer; 254 | 255 | 256 | void SamdAudio::configureReaderTimer() 257 | { 258 | // The GCLK clock provider to use 259 | // GCLK0, GCLK1 & GCLK3 are used already, see startup.c 260 | 261 | //GCLK0 ... freezes serial.. on adafruit M0 262 | 263 | const uint8_t GCLK_SRC = 1; //1 works for Adafruit M0 express 264 | 265 | // Configure the XOSC32K to run in standby 266 | //SYSCTRL->XOSC32K.bit.RUNSTDBY = 1; 267 | 268 | // Setup clock provider GCLK_SRC with a /2 source divider 269 | // GCLK_GENDIV_ID(X) specifies which GCLK we are configuring 270 | // GCLK_GENDIV_DIV(Y) specifies the clock prescalar / divider 271 | // If GENCTRL.DIVSEL is set (see further below) the divider 272 | // is 2^(Y+1). If GENCTRL.DIVSEL is 0, the divider is simply Y 273 | // This register has to be written in a single operation 274 | GCLK->GENDIV.reg = GCLK_GENDIV_ID(GCLK_SRC) | GCLK_GENDIV_DIV(2); 275 | while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) { 276 | /* Wait for synchronization */ 277 | } 278 | 279 | // Configure the GCLK module 280 | // GCLK_GENCTRL_GENEN, enable the specific GCLK module 281 | // GCLK_GENCTRL_SRC_XOSC32K, set the source to the XOSC32K 282 | // GCLK_GENCTRL_ID(X), specifies which GCLK we are configuring 283 | // GCLK_GENCTRL_DIVSEL, specify which prescalar mode we are using 284 | // GCLK_RUNSTDBY, keep the GCLK running when in standby mode 285 | // Output from this module is 16khz (32khz / 2) 286 | // This register has to be written in a single operation. 287 | GCLK->GENCTRL.reg = GCLK_GENCTRL_GENEN | 288 | GCLK_GENCTRL_SRC_XOSC32K | 289 | GCLK_GENCTRL_ID(GCLK_SRC); 290 | while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) { 291 | /* Wait for synchronization */ 292 | } 293 | 294 | // Turn the power to the TC3 module on 295 | PM->APBCMASK.reg |= PM_APBCMASK_TC3; 296 | 297 | // Set TC3 (shared with TCC2) GCLK source to GCLK_SRC 298 | // GCLK_CLKCTRL_CLKEN, enable the generic clock 299 | // GCLK_CLKCTRL_GEN(X), specifies the GCLK generator source 300 | // GCLK_CLKCTRL_ID(X), specifies which generic clock we are configuring 301 | GCLK->CLKCTRL.reg = GCLK_CLKCTRL_CLKEN | 302 | GCLK_CLKCTRL_GEN(GCLK_SRC) | 303 | GCLK_CLKCTRL_ID(GCM_TCC2_TC3); 304 | while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY) { 305 | /* Wait for synchronization */ 306 | } 307 | 308 | // Disable TC3. This is required (if enabled already) 309 | // before setting certain registers 310 | TC3->COUNT8.CTRLA.reg &= ~TC_CTRLA_ENABLE; 311 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 312 | /* Wait for synchronization */ 313 | } 314 | 315 | // Set the mode to 8 bit and set it to run in standby 316 | // TC_CTRLA_MODE_COUNT8, specify 8bit mode 317 | // TC_CTRLA_RUNSTDBY, keep the module running when in standby 318 | // TC_CTRLA_PRESCALER_DIVxx, set the prescalar to 64 319 | // Prescalar options include: DIV1, DIV2, DIV4, DIV8, 320 | // DIV16, DIV64, DIV256, DIV1024 321 | TC3->COUNT8.CTRLA.reg = TC_CTRLA_MODE_COUNT8 | 322 | TC_CTRLA_RUNSTDBY | 323 | TC_CTRLA_PRESCALER_DIV1; 324 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 325 | /* Wait for synchronization */ 326 | } 327 | 328 | // Enable the TC3 interrupt vector 329 | // Set the priority to second (less important than feeding the DAC 330 | NVIC_DisableIRQ(TC3_IRQn); 331 | NVIC_ClearPendingIRQ(TC3_IRQn); 332 | NVIC_SetPriority(TC3_IRQn, 0xFFFF); 333 | NVIC_EnableIRQ(TC3_IRQn); 334 | 335 | 336 | // Enable interrupt on overflow 337 | // TC_INTENSET_OVF, enable an interrupt on overflow 338 | TC3->COUNT8.INTENSET.reg = TC_INTENSET_OVF; 339 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 340 | /* Wait for synchronization */ 341 | } 342 | 343 | // Enable TC3 344 | TC3->COUNT8.CTRLA.reg |= TC_CTRLA_ENABLE; 345 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 346 | /* Wait for synchronization */ 347 | } 348 | } 349 | 350 | void SamdAudio::enableReaderTimer() 351 | { 352 | NVIC_EnableIRQ(TC3_IRQn); 353 | TC3->COUNT8.CTRLA.reg |= TC_CTRLA_ENABLE; 354 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 355 | /* Wait for synchronization */ 356 | } 357 | } 358 | 359 | void SamdAudio::disableReaderTimer() 360 | { 361 | TC3->COUNT8.CTRLA.reg &= ~TC_CTRLA_ENABLE; 362 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 363 | /* Wait for synchronization */ 364 | } 365 | NVIC_DisableIRQ(TC3_IRQn); 366 | } 367 | 368 | 369 | 370 | 371 | 372 | #ifdef __cplusplus 373 | extern "C" { 374 | #endif 375 | 376 | // TC5 ISR 377 | void AudioPlay_Handler (void) 378 | { 379 | __audioData=0; 380 | 381 | for(uint8_t index=0; index<__numOfChannelsUsed; index++) 382 | { 383 | if (__audioPlaying[index]) 384 | { 385 | if(__audioFile[index].available()) 386 | { 387 | if (__SampleIndex[index] < __audioBufferSize - 1) 388 | { 389 | __audioData+=__WavSamples[index][whichBuffer[index]][__SampleIndex[index]++]/rampDivisor[index]; 390 | 391 | } 392 | else //last sample from buffer 393 | { 394 | __audioData+=__WavSamples[index][whichBuffer[index]][__SampleIndex[index]++]/rampDivisor[index]; 395 | 396 | __SampleIndex[index] = 0; 397 | if(!fillNextBuffer[index]) //we have been able to load next buffer : continue; else, loop the buffer... 398 | whichBuffer[index]=1-whichBuffer[index]; 399 | fillNextBuffer[index]=1; 400 | } 401 | 402 | if(rampDivisor[index]>1) 403 | rampDivisor[index]--; 404 | } 405 | 406 | //end of file, now play ramp out 407 | else if (__audioFileReady[index]) 408 | { 409 | __audioFile[index].close(); 410 | __audioFileReady[index] = false; 411 | rampDivisor[index]=__WavSamples[index][whichBuffer[index]][__SampleIndex[index]]; //start ramp out from last audio sample 412 | __audioData+=rampDivisor[index]; 413 | } 414 | else if(rampDivisor[index]>0)//ramp out finish, end of activity on the channel 415 | { 416 | __audioData+=rampDivisor[index]--; 417 | } 418 | else 419 | { 420 | __audioPlaying[index]=false; 421 | 422 | if(!__channelsPlaying()) 423 | { 424 | //tc disable 425 | TC5->COUNT16.CTRLA.reg &= ~TC_CTRLA_ENABLE; 426 | while (TC5->COUNT16.STATUS.reg & TC_STATUS_SYNCBUSY); 427 | 428 | TC3->COUNT8.CTRLA.reg &= ~TC_CTRLA_ENABLE; 429 | while (TC3->COUNT8.STATUS.reg & TC_STATUS_SYNCBUSY) { 430 | /* Wait for synchronization */ 431 | } 432 | 433 | } 434 | } 435 | } 436 | } 437 | 438 | 439 | if(__channelsPlaying()) 440 | { 441 | if(__numOfChannelsUsed == 4 || __numOfChannelsUsed == 3) 442 | { 443 | __audioData>>=0; 444 | } 445 | else if(__numOfChannelsUsed == 2) 446 | { 447 | __audioData<<=1; 448 | } 449 | else if(__numOfChannelsUsed == 1) 450 | { 451 | __audioData<<=2; 452 | } 453 | 454 | DAC->DATA.reg = __audioData & 0x3FF; // DAC on 10 bits. 455 | while (DAC->STATUS.bit.SYNCBUSY == 1); 456 | } 457 | 458 | 459 | // Clear the interrupt 460 | TC5->COUNT16.INTFLAG.bit.MC0 = 1; 461 | 462 | } 463 | 464 | 465 | 466 | // TC3 ISR 467 | void AudioRead_Handler() 468 | { 469 | if (TC3->COUNT8.INTFLAG.bit.OVF) 470 | { 471 | for(uint8_t index=0; index<__numOfChannelsUsed; index++) 472 | { 473 | if(__audioPlaying[index]) 474 | { 475 | if(__audioFile[index].available() && !__criticalSection && fillNextBuffer[index]) 476 | { 477 | __audioFile[index].read(__WavSamples[index][1-whichBuffer[index]], __audioBufferSize); 478 | fillNextBuffer[index]=0; 479 | } 480 | } 481 | } 482 | // Reset interrupt flag 483 | TC3->COUNT8.INTFLAG.bit.OVF = 1; 484 | } 485 | } 486 | 487 | #ifdef __cplusplus 488 | } 489 | #endif 490 | -------------------------------------------------------------------------------- /SamdAudio.h: -------------------------------------------------------------------------------- 1 | /* 2 | Copyright (c) 2016 Th�o Meyer aka AloyseTech. All right reserved. 3 | 4 | This library is free software; you can redistribute it and/or 5 | modify it under the terms of the GNU Lesser General Public 6 | License as published by the Free Software Foundation; either 7 | version 3 of the License, or (at your option) any later version. 8 | 9 | This library is distributed in the hope that it will be useful, 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 12 | See the GNU Lesser General Public License for more details. 13 | 14 | You should have received a copy of the GNU Lesser General Public 15 | License along with this library; if not, write to the Free Software 16 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 | */ 18 | 19 | #ifndef SAMDAUDIO_H 20 | #define SAMDAUDIO_H 21 | 22 | #include "Arduino.h" 23 | #include "Print.h" 24 | 25 | #include 26 | 27 | 28 | //********************************** 29 | 30 | // defines the max number of channels that this device can handle 31 | #define MAX_N_CHANNELS 4 32 | 33 | #define MAX_AUDIO_BUFFER_SIZE 1024 // value can be set in the sketch AUIDO_BUFFER_SIZE 34 | 35 | #define RAMPIN 255 36 | 37 | //********************************** 38 | 39 | class SamdAudio{ 40 | public: 41 | 42 | SamdAudio(){}; 43 | int begin(uint32_t sampleRate, uint8_t numOfChannels, uint16_t audio_buffer_size); 44 | void play(const char *fname, uint8_t channel) ; 45 | //void play(const char *fname) ; 46 | void stopChannel(uint8_t c); 47 | void end(); 48 | 49 | void criticalON(); 50 | void criticalOFF(); 51 | 52 | private: 53 | 54 | void dacConfigure(void); 55 | 56 | //The first timer is used to feed the DAC with data every 1/sampleRate sec 57 | void configurePlayerTimer(uint32_t sampleRate); 58 | bool syncPlayerTimer(void); 59 | void resetPlayerTimer(void); 60 | void enablePlayerTimer(void); 61 | void disablePlayerTimer(void); 62 | 63 | //the second timer is used to read audio data from the SD card every 15.6ms 64 | void configureReaderTimer(); 65 | void enableReaderTimer(); 66 | void disableReaderTimer(); 67 | 68 | void updaterConfigure(); 69 | 70 | bool alonePlaying(uint8_t channel); 71 | bool someonePlaying(); 72 | 73 | 74 | }; 75 | #endif //SAMDAUDIO_H 76 | -------------------------------------------------------------------------------- /audio/piano8bit_22khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/piano8bit_22khz.wav -------------------------------------------------------------------------------- /audio/poem8bit_32khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/poem8bit_32khz.wav -------------------------------------------------------------------------------- /audio/sfx1_8bit_22khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/sfx1_8bit_22khz.wav -------------------------------------------------------------------------------- /audio/sfx1_8bit_32khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/sfx1_8bit_32khz.wav -------------------------------------------------------------------------------- /audio/sfx2_8bit_22khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/sfx2_8bit_22khz.wav -------------------------------------------------------------------------------- /audio/sfx2_8bit_32khz.wav: 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-------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/sfx4_8bit_22khz.wav -------------------------------------------------------------------------------- /audio/sfx4_8bit_32khz.wav: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/audio/sfx4_8bit_32khz.wav -------------------------------------------------------------------------------- /examples/play_wav_from_FLASH/play_wav_from_FLASH.ino: -------------------------------------------------------------------------------- 1 | /* 2 | 3 | Audio player, non blocking. 4 | read 8bit mono .wav file, up to 4 channels 5 | use Audacity to convert your audio file 6 | Author : AloyseTech 7 | 8 | 03/17/19: https://github.com/hydronics2/SamdAudio 9 | updated to work with Adafruit Qaud Flash memory boards. 10 | This will work with any SAMD21 chip using SPI flash with a little tinkering 11 | - itsyBitsy M0 Express, 12 | - Feather M0 Express, 13 | - probalby M4 of abovev and trinkets 14 | 15 | Read this great description in the Adafruit tutorial for getting the WAV files onto your Adafruit M0 Express board 16 | https://learn.adafruit.com/introducing-itsy-bitsy-m0?view=all#using-spi-flash 17 | Thanks to Tondy Dicola and Adafruit for making this so easy! 18 | 19 | if the sketch compiles and Initializes Audio player, but no sound, look in SamdAudio.cpp and umcomment these! 20 | - #include 21 | - #include 22 | - extern Adafruit_W25Q16BV_FatFs memory; 23 | 24 | */ 25 | 26 | #include 27 | 28 | #include 29 | #include 30 | 31 | #define FLASH_TYPE SPIFLASHTYPE_W25Q16BV // Flash chip type. 32 | // If you change this be 33 | // sure to change the fatfs 34 | // object type below to match. 35 | 36 | #define FLASH_SS SS1 // Flash chip SS pin. 37 | #define FLASH_SPI_PORT SPI1 // What SPI port is Flash on? 38 | 39 | Adafruit_SPIFlash flash(FLASH_SS, &FLASH_SPI_PORT); // Use hardware SPI 40 | 41 | // Finally create an Adafruit_M0_Express_CircuitPython object which gives 42 | // an SD card-like interface to interacting with files stored in CircuitPython's 43 | // flash filesystem. 44 | //Adafruit_M0_Express_CircuitPython pythonfs(flash); 45 | Adafruit_W25Q16BV_FatFs memory(flash); 46 | 47 | #include // 48 | SamdAudio AudioPlayer; 49 | 50 | #define NUM_AUDIO_CHANNELS 4 //could be 1,2 or 4 for sound 51 | 52 | #define AUDIO_BUFFER_SIZE 1024 //512 works fine for 22.05kh, use 1024 for 32khz and 44.1khz 53 | 54 | //indicate sample rate here (use audacity to convert your wav) 55 | const unsigned int sampleRate = 32000; //hz 56 | 57 | //your wav file 58 | const char *filename0 = "poem8bit_32khz.wav"; 59 | const char *filename1 = "sfx1_8bit_32khz.wav"; 60 | const char *filename2 = "sfx2_8bit_32khz.wav"; 61 | const char *filename3 = "sfx3_8bit_32khz.wav"; 62 | const char *filename4 = "sfx4_8bit_32khz.wav"; 63 | 64 | void setup() 65 | { 66 | delay(10); 67 | Serial.begin(115200); 68 | while (!Serial); // open the serial to start! 69 | 70 | // Initialize flash library and check its chip ID. 71 | if (!flash.begin(FLASH_TYPE)) 72 | { 73 | Serial.println("Error, failed to initialize flash chip!"); 74 | while(1); 75 | } 76 | Serial.print("Flash chip JEDEC ID: 0x"); Serial.println(flash.GetJEDECID(), HEX); 77 | // First call begin to mount the filesystem. Check that it returns true 78 | // to make sure the filesystem was mounted. 79 | if (!memory.begin()) 80 | { 81 | Serial.println("Error, failed to mount filesystem!"); 82 | while(1); 83 | } 84 | Serial.println("Mounted filesystem!"); 85 | 86 | Serial.print("Initializing Audio Player..."); 87 | if (AudioPlayer.begin(sampleRate, NUM_AUDIO_CHANNELS, AUDIO_BUFFER_SIZE) == -1) 88 | { 89 | Serial.println(" failed!"); 90 | return; 91 | } 92 | Serial.println(" done."); 93 | 94 | AudioPlayer.play(filename0, 1); 95 | 96 | Serial.println("Playing file....."); 97 | } 98 | 99 | 100 | void loop() 101 | { 102 | if (Serial.available()) 103 | { 104 | char c = Serial.read(); 105 | Serial.println(c); //for debug 106 | 107 | if ( c == 'o') 108 | { 109 | AudioPlayer.play(filename1, 0); //playing file on channel 0 110 | Serial.println("playing audio file on channel 0"); 111 | } 112 | if ( c == 'p') 113 | { 114 | AudioPlayer.play(filename2, 1); //playing file on channel 1 115 | Serial.println("playing audio file on channel 1"); 116 | } 117 | if ( c == 'k') 118 | { 119 | AudioPlayer.play(filename3, 2); //playing file on channel 2 120 | Serial.println("playing audio file on channel 2"); 121 | } 122 | if ( c == 'l') 123 | { 124 | AudioPlayer.play(filename4, 3); //playing file on channel 3 125 | Serial.println("playing audio file on channel 3"); 126 | } 127 | } 128 | } 129 | 130 | -------------------------------------------------------------------------------- /examples/play_wav_from_SD_card/play_wav_from_SD_card.ino: -------------------------------------------------------------------------------- 1 | /* 2 | Audio player, non blocking. 3 | read 8bit mono .wav file, up to 4 channels 4 | use Audacity to convert your audio file 5 | 6 | Author : AloyseTech 7 | Modified: BriscoeTech 8 | 03/17/19: https://github.com/hydronics2/SamdAudio 9 | 10 | 11 | if the sketch compiles, but no sound, check to make sure: 12 | - '#include ' is uncommented in SamdAudio.cpp 13 | - 'extern SdFat memory;' is ucommented in SamdAudio.cpp 14 | 15 | 16 | */ 17 | 18 | #include //https://github.com/greiman/SdFat 19 | SdFat memory; 20 | 21 | #include 22 | 23 | SamdAudio AudioPlayer; 24 | 25 | #define NUM_AUDIO_CHANNELS 4 //could be 1,2 or 4 for sound 26 | 27 | #define AUDIO_BUFFER_SIZE 512 //512 works fine for 22.05kh, 28 | //set buffer size to 1024 for 32khz and 44.1khz for Adafruit M0 with QUAD Flash 29 | 30 | //indicate sample rate here (use audacity to convert your wav) 31 | const unsigned int sampleRate = 22050; //hz 32 | 33 | //your wav file 34 | const char *filename0 = "piano8bit_22khz.wav"; 35 | const char *filename1 = "sfx1_8bit_22khz.wav"; 36 | const char *filename2 = "sfx2_8bit_22khz.wav"; 37 | const char *filename3 = "sfx3_8bit_22khz.wav"; 38 | const char *filename4 = "sfx4_8bit_22khz.wav"; 39 | 40 | // SD chip select pin (with ethernet shield : 4) 41 | #define YOUR_SD_CS 10 42 | 43 | void setup() 44 | { 45 | pinMode(YOUR_SD_CS, OUTPUT); 46 | 47 | 48 | if ( !memory.begin(YOUR_SD_CS) ) 49 | { 50 | //the sd card error was found, exit this function and to not attempt to finish 51 | Serial.println("can't start card"); 52 | } 53 | 54 | Serial.begin(115200); 55 | while (!Serial); // open the serial to start! 56 | 57 | Serial.print("Initializing Audio Player..."); 58 | if (AudioPlayer.begin(sampleRate, NUM_AUDIO_CHANNELS, AUDIO_BUFFER_SIZE) == -1) 59 | { 60 | Serial.println(" failed!"); 61 | return; 62 | } 63 | Serial.println(" done."); 64 | 65 | AudioPlayer.play(filename0, 1); //play 1st file on channel 0 66 | 67 | Serial.println("Playing file....."); 68 | } 69 | 70 | void loop() 71 | { 72 | if (Serial.available()) 73 | { 74 | char c = Serial.read(); 75 | Serial.println(c); //for debug 76 | 77 | if ( c == 'o') 78 | { 79 | AudioPlayer.play(filename1, 0); //playing file on channel 0 80 | Serial.println("playing audio file on channel 0"); 81 | } 82 | if ( c == 'p') 83 | { 84 | AudioPlayer.play(filename2, 1); //playing file on channel 1 85 | Serial.println("playing audio file on channel 1"); 86 | } 87 | if ( c == 'k') 88 | { 89 | AudioPlayer.play(filename3, 2); //playing file on channel 2 90 | Serial.println("playing audio file on channel 2"); 91 | } 92 | if ( c == 'l') 93 | { 94 | AudioPlayer.play(filename4, 3); //playing file on channel 3 95 | Serial.println("playing audio file on channel 3"); 96 | } 97 | } 98 | } 99 | -------------------------------------------------------------------------------- /library.properties: -------------------------------------------------------------------------------- 1 | name=SamdAudio 2 | version=1.0 3 | author=AloyseTech, modified BriscoeTech 4 | maintainer=BriscoeTech 5 | sentence=Allows playing audio files from an SD card, without blocking sketch execution. For Arduino Samd21. 6 | paragraph=With this library you can use the SamD21 DAC output to play audio files.
The audio files must be in the raw 8bit .wav format. 7 | category=Signal Input/Output 8 | architectures=samd 9 | -------------------------------------------------------------------------------- /library_modification_SD_card.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/library_modification_SD_card.JPG -------------------------------------------------------------------------------- /library_modification_flash.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/library_modification_flash.JPG -------------------------------------------------------------------------------- /screen_shot.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/hydronics2/SamdAudio/19c0d4b16d766187575c76ff358f950cf4122d9b/screen_shot.JPG --------------------------------------------------------------------------------