i2s not working yet

soundcube-i2s-test/soundcube-i2s-test.ino

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+/*
+   I2S bi-directional input and output buffered loopback example
+   Released to the Public Domain by Cooper Dalrymple
+*/
+#include <Wire.h>
+#include <I2S.h>
+
+I2S i2s(INPUT_PULLUP);
+
+#define SIZE 256
+int16_t buffer[SIZE];
+
+void cw(char first, char second){
+  Wire1.beginTransmission(0x18);
+  Wire1.write(first);
+  Wire1.write(second);
+  Wire1.endTransmission();
+  delay(5);
+}
+
+void setup() {
+  Serial.begin(115200);
+
+  delay(1000);
+
+  Wire1.setSDA(2);
+  Wire1.setSCL(3);
+  Wire1.begin();
+
+  delay(1000);
+
+  // GENERAL
+  cw(0x00, 0x00);
+  cw(0x01, 0x01);
+  cw(0x1b, 0x10); // select I2S
+
+  // ADC
+  cw(0x00, 0x00); // select page 0
+  //cw(0x01, 0x01); // soft reset
+  cw(0x12, 0x87); // NADC 7
+  cw(0x13, 0x82); // MADC 2
+  cw(0x14, 0x80); // OSR ADC 128
+  cw(0x3d, 0x01); // ADC PRB_R1
+  
+  cw(0x00, 0x01); // select page 1
+  cw(0x01, 0x08); // disable crude AVdd
+  cw(0x02, 0x01); // enable internal AVdd LDO
+  cw(0x0a, 0x0B); // set input CM to 0.9V and LO to 1.65V
+  cw(0x3d, 0x00); // ADC PTM_R4
+  cw(0x34, 0x80); // route IN1L to LEFT_P with 20k input impedance
+  cw(0x36, 0x80); // route CM to LEFT_M with 20k input impedance
+  cw(0x37, 0x80); // route IN1R to RIGHT_P with 20k input impedance
+  cw(0x39, 0x80); // route CM to RIGHT_M with 20k input impedance
+  cw(0x3b, 0x0c); // unmute left MICPGA
+  cw(0x3c, 0x0c); // unmute right MICPGA
+
+  cw(0x00, 0x00); // select page 0
+  cw(0x51, 0xc0); // power up ADC
+  cw(0x51, 0x00); // unmute ADC digital volume control
+
+  // DAC
+  cw(0x00, 0x00); // select page 0
+  //cw(0x01, 0x01); // software reset
+  cw(0x0b, 0x82); // NDAC 2
+  cw(0x0c, 0x87); // MDAC 7
+  cw(0x0d, 0x00); // OSR DAC 128
+  cw(0x0e, 0x80); // OSR DAC 128
+  cw(0x1b, 0x10); // world length 20bits PTM_P4 (highest performance)
+  cw(0x3c, 0x08); // PRB_P8
+
+  cw(0x00, 0x01); // select page 1
+  //cw(0x01, 0x08); // disable internal crude avdd
+  //cw(0x02, 0x01); // enable AVdd LDO
+  cw(0x7b, 0x01); // set REF charging time to 40ms
+  //cw(0x14, 0x25); // set HP soft stepping for anti pop
+  //cw(0x0a, 0x0B); // set input CM to 0.9V and LO to 1.65V
+  cw(0x0e, 0x08); // left DAC reconstruction filter routed to LOL
+  cw(0x0f, 0x08); // right DAC reconstruction filter routed to LOR
+  cw(0x03, 0x00); // DAC PTM_P3/4
+  cw(0x04, 0x00); // DAC PTM_P3/4
+  cw(0x12, 0x00); // LOL gain 0dB
+  cw(0x13, 0x00); // LOR gain 0dB
+  delay(1000);
+
+  cw(0x00, 0x00); // select page 0
+  cw(0x3f, 0xd6); // power up and route left digital audio to left dac channel and right to right
+  cw(0x40, 0x00); // unmute DAC digital volume
+
+
+  pinMode(19, OUTPUT); // MCLK enable
+  pinMode(20, OUTPUT); // CODEC reset
+
+  i2s.setSysClk(48000);
+
+  i2s.setDOUT(14);
+  i2s.setDIN(15);
+  i2s.setBCLK(16); // Note: LRCLK = BCLK + 1
+  i2s.setMCLK(18);
+  i2s.swapClocks();
+  i2s.setBitsPerSample(16);
+  i2s.setFrequency(48000);
+  i2s.setMCLKmult(128); // 6144000Hz 6.144MHz
+
+  i2s.setBuffers(6, SIZE * sizeof(int16_t) / sizeof(uint32_t));
+
+  digitalWrite(19, HIGH); // enable MCLK
+  digitalWrite(20, HIGH);
+  i2s.begin();
+
+  size_t count, index;
+  while (1) {
+    count = i2s.read((uint8_t *)&buffer, SIZE * sizeof(int16_t)) * sizeof(uint32_t) / sizeof(int16_t);
+    index = 0;
+    while (index < count) {
+      // Reduce volume by half
+      buffer[index++] >>= 1; // right
+      buffer[index++] >>= 1; // left
+    }
+    i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
+  }
+}
+
+void loop() {
+  /* Nothing here */
+}