working audio

FW/leo_muziekdoos_sam51/src/audio.cpp

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+// Arduino Zero / Feather M0 I2S audio tone generation example.
+// Author: Tony DiCola
+//
+// Connect an I2S DAC or amp (like the UDA1334A) to the Arduino Zero
+// and play back simple sine, sawtooth, triangle, and square waves.
+// Makes your Zero sound like a NES!
+//
+// NOTE: The I2S signal generated by the Zero does NOT have a MCLK /
+// master clock signal.  You must use an I2S receiver that can operate
+// without a MCLK signal (like the UDA1334A).
+//
+// For an Arduino Zero / Feather M0 connect it to you I2S hardware as follows:
+// - Digital 0 -> I2S LRCLK / FS (left/right / frame select clock)
+// - Digital 1 -> I2S BCLK / SCLK (bit / serial clock)
+// - Digital 9 -> I2S DIN / SD (data output)
+// - Ground
+//
+// Released under a MIT license: https://opensource.org/licenses/MIT
+#include "audio.h"
+
+#include <I2S.h>
+#include <DMA.h>
+#include "utility/dma.h"
+#include <math.h>
+
+#include "storage.h"
+
+/* max volume for 32 bit data */
+#define VOLUME ( (1UL << 31) - 1)
+
+/* create a buffer for both the left and right channel data */
+#define BUFSIZE 256
+int data[BUFSIZE];
+
+DMA_class myDMA;
+DMAstatus    stat; // DMA status codes returned by some functions
+
+I2S_class i2s;
+
+bool transfer_is_done = false;
+bool playbackIsDone = true;
+
+void dma_callback(DMA_class *dma) {
+  /* we don't need to do anything here */
+  transfer_is_done = true;
+}
+
+void initAudio(void)
+{
+  Serial.begin(115200);
+  //while(!Serial);                 // Wait for Serial monitor before continuing
+
+  Serial.println("I2S output via DMA");
+
+  int *ptr = data;
+
+  /*the I2S module will be expecting data interleaved LRLR*/
+  for(int i=0; i<BUFSIZE/2; i++){
+      /* create a sine wave on the left channel */
+        *ptr++ = sin( (2*PI / (BUFSIZE/2) ) * i) * VOLUME;
+
+        /* create a cosine wave on the right channel */
+        *ptr++ = cos( (2*PI / (BUFSIZE/2) ) * i) * VOLUME;
+  }
+
+  Serial.println("Configuring DMA trigger");
+  myDMA.setTrigger(I2S_DMAC_ID_TX_0);
+  myDMA.setAction(DMA_TRIGGER_ACTON_BEAT);
+
+  Serial.print("Allocating DMA channel...");
+  stat = myDMA.allocate();
+  myDMA.printStatus(stat);
+
+  Serial.println("Setting up transfer");
+    myDMA.addDescriptor(
+      data,                    // move data from here
+#if defined(__SAMD51__)
+      (void *)(&I2S->TXDATA.reg), // to here (M4)
+#else
+      (void *)(&I2S->DATA[0].reg), // to here (M0+)
+#endif
+    BUFSIZE,                      // this many...
+      DMA_BEAT_SIZE_WORD,               // bytes/hword/words
+      true,                             // increment source addr?
+      false);
+  myDMA.loop(true);
+  Serial.println("Adding callback");
+  myDMA.setCallback(dma_callback);
+
+  /* begin I2S on the default pins. 24 bit depth at
+   * 44100 samples per second
+   */
+  i2s.begin(I2S_32_BIT, 44100);
+  i2s.enableTx();
+
+  stat = myDMA.startJob();
+}
+
+uint32_t filendex = 0;
+uint32_t filesize = 0;
+File musicFileHandle;
+
+void handleAudio(void)
+{
+  
+}

FW/leo_muziekdoos_sam51/src/audio.h

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+#pragma once
+
+#include "arduino.h"
+
+
+void initAudio(void);
+void handleAudio(void);

FW/leo_muziekdoos_sam51/src/main.cpp

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+#include "audio.h"
+#include "storage.h"
+
+void setup()
+{
+  initAudio();
+  initStorage();
+}
+
+void loop()
+{
+  handleAudio();
+  handleStorage();
+}

FW/leo_muziekdoos_sam51/src/storage.cpp

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+#include "storage.h"
+
+File root;
+
+
+void printDirectory(File dir, int numTabs) {
+  // Begin at the start of the directory
+  dir.rewindDirectory();
+  
+  while(true) {
+     File entry =  dir.openNextFile();
+     if (! entry) {
+       // no more files
+       //Serial.println("**nomorefiles**");
+       break;
+     }
+     for (uint8_t i=0; i<numTabs; i++) {
+       Serial.print('\t');   // we'll have a nice indentation
+     }
+     // Print the 8.3 name
+     Serial.print(entry.name());
+     // Recurse for directories, otherwise print the file size
+     if (entry.isDirectory()) {
+       Serial.println("/");
+       printDirectory(entry, numTabs+1);
+     } else {
+       // files have sizes, directories do not
+       Serial.print("\t\t");
+       Serial.println(entry.size(), DEC);
+     }
+     entry.close();
+   }
+}
+
+void initStorage(void)
+{
+ if(!SD.begin(A5))
+ {
+   Serial.println("Failed to init SDcard");
+ }
+
+ root = SD.open("/");
+}
+
+void handleStorage(void)
+{
+  //printDirectory(root, 0);
+
+}
+
+File getmusicFile(void)
+{
+  if(SD.exists("/003.WAV"))
+  {
+    return SD.open("/003.WAV");
+  }
+}

FW/leo_muziekdoos_sam51/src/storage.h

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+#pragma once
+
+#include "SPI.h"
+#include "SD.h"
+
+void initStorage(void);
+void handleStorage(void);
+
+File getmusicFile(void);