A little fixes for making work SAMD51 with I2S

libraries/I2S/examples/I2S_input_D51/I2S_input_D51.ino

@@ -0,0 +1,116 @@
+/*
+  This example reads audio data from an Invensense's ICS43432 I2S microphone
+  breakout board, and prints out the samples to the Serial console. The
+  Serial Plotter built into the Arduino IDE can be used to plot the audio
+  data (Tools -> Serial Plotter)
+
+  Circuit:
+   Arduino/Genuino Zero, MKRZero or MKR1000 board
+   ICS43432:
+     GND connected GND
+     3.3V connected 3.3V (Zero) or VCC (MKR1000, MKRZero)
+     WS connected to pin 0 (Zero) or pin 3 (MKR1000, MKRZero)
+     CLK connected to pin 1 (Zero) or pin 2 (MKR1000, MKRZero)
+     SD connected to pin 9 (Zero) or pin A6 (MKR1000, MKRZero)
+
+  created 17 November 2016
+  by Sandeep Mistry
+*/
+
+
+// Used by Adafruit on
+// It eventually hangs, so it's recommend to use "ArduinoSound" Library on SAMD21G is discussed here:
+//    Dictaphone project - MKRZero hangs indefinitely: https://forum.arduino.cc/index.php?topic=455963.0
+//    i2s mic returns 0 or -1: https://forums.adafruit.com/viewtopic.php?f=19&t=115089
+// This sketch is NOT compatible with SAMD51J
+
+#include <I2S.h>
+//#define Serial SerialUSB
+uint8_t _buffer[I2S_BUFFER_SIZE];
+
+void setup() {
+  //I2S = I2SClass(I2S_DEVICE, I2S_CLOCK_GENERATOR, PIN_I2S_SDI, PIN_I2S_SCK, PIN_I2S_FS);
+  // Open serial communications and wait for port to open:
+  // A baud rate of 115200 is used instead of 9600 for a faster data rate
+  // on non-native USB ports
+  Serial.begin(115200);
+  while (!Serial) {
+    ; // wait for serial port to connect. Needed for native USB port only
+  }
+  Serial.println("I2S_input_D51");
+  // start I2S at 8 kHz with 32-bits per sample
+  if (!I2S.begin(I2S_PHILIPS_MODE, 48000, 32)) { // 48,000,000 / sampleRate must be a multiple of 64
+    Serial.println("Failed to initialize I2S!");
+    while (1); // do nothing
+  }
+
+  I2S.read(_buffer, I2S_BUFFER_SIZE);
+}
+
+void loop() 
+{
+
+  int32_t sampleLeft, sampleRight = 0;
+
+// Scan & Print samples using I2S DMA double buffer technique
+  while (!I2S.available());
+  int bytes = I2S.read(_buffer, I2S_BUFFER_SIZE);
+  //Serial.println("bytes: " + String(bytes)); // must be 512 bytes
+
+  for (int i = 0; i < bytes; i += 8)
+  {
+    // Get Samples
+    memcpy(&sampleLeft, &_buffer[i], 4);
+    memcpy(&sampleRight, &_buffer[i+4], 4);
+
+    // convert to 24 bits
+    //sampleLeft >>= 8;
+    //sampleLeft  &= 0x00ffffff;
+    //sampleRight >>= 8;
+    //sampleRight  &= 0x00ffffff;
+
+    // Get samples another way
+    //sampleLeft = 0;
+    //sampleLeft |= ((uint32_t)_buffer[i])   << 16; // MSB
+    //sampleLeft |= ((uint32_t)_buffer[i+1]) << 8;
+    //sampleLeft |= ((uint32_t)_buffer[i+2]) << 0;
+    //sampleLeft |= ((uint32_t)_buffer[i+3] << 24); // LSB, commented for 24 bit resolution
+
+    //sampleRight = 0;
+    //sampleRight |= ((uint32_t)_buffer[i+4]) << 16; // MSB 
+    //sampleRight |= ((uint32_t)_buffer[i+5]) << 8;
+    //sampleRight |= ((uint32_t)_buffer[i+6]) << 0;
+    //sampleRight |= ((uint32_t)_buffer[i+7] << 24); // LSB
+
+    // print samples
+    Serial.print(sampleLeft);
+    Serial.print(",");
+    Serial.println(sampleRight);
+  }
+
+// Scan using one read
+  //sampleLeft = I2S.read();    Serial.println(sampleLeft);
+  //sampleRight = I2S.read(); Serial.println(sampleRight);
+
+
+/*
+//Scan using Adafruit Zero I2S Read
+    I2S.read(&sampleLeft, &sampleRight);
+
+    Serial.print(sampleLeft); // sampleLeft
+    Serial.print(",");
+    Serial.println(sampleRight); // sampleRight
+  */
+
+  /*
+    I2S.read(_buffer, I2S_BUFFER_SIZE);
+    for (int i=0; i<I2S_BUFFER_SIZE; ++i)
+      if (i%4 == 0)
+        Serial.print("\t0x");
+      else
+        Serial.print(_buffer[i], HEX); // sampleLeft
+    Serial.println();
+  */
+  delay(1);
+  //delayMicroseconds(125); // 1/SAMPLERATE seconds
+}