sampler at 80 percent

README.md

@@ -1,5 +1,127 @@
 # Soundcube Firmware
 
+## Install new firmware
+
+1. Go to [Releases](https://code.w4d.dev/W4D/soundcube-firmware/releases)
+2. Download latest `soundcube-firmware.ino.uf2` file
+3. On your Soundcube Board: Press and hold the outer most white button as seen from the USB-C socket
+4. While holding the button press the inner most white button once
+	- the board will go into bootloader mode and appear as USB thumb drive
+6. Copy the `soundcube-firmware.ino.uf2` file to the thumb drive and wait for the board to restart
+
+
+## SD Card contents
+
+
+```
+config.txt
+sound/
+  ├─ 1.wav
+  ├─ 2.wav
+  ├─ 3.wav
+  ├─ 4.wav
+  ├─ 5.wav
+  ├─ 6.wav
+  ├─ 7.wav
+  ├─ 8.wav
+ui/
+  ├─ click.wav
+  ├─ beep.wav
+
+```
+
+### config.txt
+
+Json formatted config file. For now only edge led color working.
+
+```
+{
+    "boxid":"",
+    "edge": {
+        "color":{
+            "idle":{
+                "r":50,
+                "g":0,
+                "b":50
+            },
+            "active":{
+                "r":0,
+                "g":50,
+                "b":50
+            }
+        }
+    },
+    "ring": {
+        "color":{
+            "idle":{
+                "r":0,
+                "g":50,
+                "b":50
+            },
+            "active":{
+                "r":0,
+                "g":80,
+                "b":50
+            }
+        }
+    }
+}
+```
+
+## Sound
+
+### UI
+
+There are two UI sounds - `click.wav` and `beep.wav`.
+
+- `click.wav` is played when a button is pressed other than the select button
+- `beep.wav` is played when the rotary encoder select button is pressed
+
+Put these files in the subfolder `ui` on the SD card.
+
+#### Wave File Format for UI Sounds
+
+`click.wav` needs to be **22050Hz (22kHz) 16bit Mono**
+
+
+### Audio Out or Speakers
+
+Put all sounds into the `/sound` subfolder. Name them `1.wav, 2.wav, 3.wav...`
+
+
+#### Wave File Format for Audio Out and Speakers
+
+Export all sounds as **48000Hz (48kHz) 16bit Stereo**.
+
+
+### Audacity
+
+You can use Audacity to export all soundfiles to WAV format.
+
+Download it here [Github](https://github.com/audacity/audacity/releases)
+
+1. Load file into Audacity
+2. Select Track
+3. File -> Export Audio
+
+#### Format options in Audacity
+
+**Audio Out**
+
+- WAV(Microsoft)
+- Chanels: Stereo
+- Samplerate: 48000Hz
+- Encoding: Signed 16-bit PCM
+
+**UI**
+
+- WAV(Microsoft)
+- Channels: Mono
+- Samplerate: 22050Hz
+- Encoding: Signed 16-bit PCM
+
+----
+
 ## Code something yourself
 
 1. Download [Arduino IDE](https://www.arduino.cc/en/software/)

soundcube-firmware/codec.h

@@ -0,0 +1,386 @@
+#pragma once
+#include <cstdint>
+#include <Wire.h>
+
+#ifndef DEBUG
+#define DEBUG false
+#endif
+
+// class TLV320AIC3204_Settings{
+
+//   public:
+//     TwoWire *wire;
+//     uint8_t i2cAddress = 0x18;
+
+//     ClockSettings1 clock_settings_1 = ClockSettings1(i2cAddress, wire);
+
+// };
+
+uint8_t logain[36] = {58,59,60,61,62,63,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29};
+
+class TLV320AIC3204{
+
+  public:
+    TLV320AIC3204() : wire(&Wire) {}
+    TLV320AIC3204(TwoWire *wire) : wire(wire) {}
+
+    void begin(){init();};
+
+    void begin(TwoWire *_wire) {
+      wire = _wire;
+      init();
+    }
+
+    void begin(uint8_t i2cAddress, TwoWire *_wire) {
+      i2cAddress = i2cAddress;
+      wire = _wire;
+      init();
+      }
+    
+    void init(){
+            // GENERAL
+      cw(0x00, 0x00); // select page 0
+      cw(0x01, 0x01); // soft reset
+      cw(0x1b, 0b00000000); // select I2S with 16 bit word length
+      cw(0x1d, 0b00000000); // disable loopback
+
+      // POWER and CM
+      cw(0x00, 0x01); // select page 1
+      cw(0x01, 0b00001000); // disable weak (crude) AVdd connection to DVdd
+      cw(0x02, 0b01011001); // enable internal AVdd LDO and enable analog blocks
+      cw(0x09, 0b00001100); // power up LOL, LOR, power down MAL, MAR, HPL, HPR
+      cw(0x0a, 0b01000000); // set full chip CM to 0.75V
+      cw(0x47, 0b00110011); // analog input quick charge time 1.6ms
+
+      // ROUTING
+      cw(0x00, 0x01); // select page 1
+      cw(0x34, 0b10000000); // LEFT MICPGA P route IN1L to LEFT_P with 40k input impedance
+      cw(0x36, 0b10000000); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+      //cw(0x36, 0b00000011); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+      cw(0x37, 0b10000000); // RIGHT MICPGA P route IN1R to RIGHT_P with 20k input impedance
+      cw(0x39, 0b10000000); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+      //cw(0x39, 0b00000011); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+      cw(0x3a, 0b00111100); // connect IN2, IN3 weakly to CM
+
+      // GAIN
+      cw(0x00, 0x01); // select page 1
+      cw(0x3b, 0b00000000); // unmute left MICPGA, set gain to 0db
+      cw(0x3c, 0b00000000); // unmute right MICPGA, set gain to 0db
+
+      // VOLUME
+      cw(0x00, 0x01); // select page 1
+      cw(0x16, 0b01110101); // MUTE IN1L to HPL
+      cw(0x17, 0b01110101); // MUTE IN1R to HPR
+
+      // ADC
+      cw(0x00, 0x00); // select page 0
+      cw(0x12, 0x81); // NADC 1
+      cw(0x13, 0x82); // MADC 2
+      cw(0x14, 0b10000000); // OSR ADC 128
+      //cw(0x14, 0b01000000); // OSR ADC 128
+      cw(0x3d, 0b00000001); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
+
+      cw(0x00, 0x01); // select page 1
+      cw(0x3d, 0b00000000); // ADC PTM_R4
+
+      // DAC
+      cw(0x00, 0x00); // select page 0
+      cw(0x0b, 0x81); // NDAC 1
+      cw(0x0c, 0x82); // MDAC 2
+      cw(0x0d, 0x00); // OSR DAC 128
+      cw(0x0e, 0x80); // OSR DAC 128
+      cw(0x1b, 0b00000000); // word length 16bits
+      cw(0x3c, 0b00000001); // PRB_P3
+
+      cw(0x00, 0x01); // select page 1
+      cw(0x7b, 0b00000001); // set REF charging time to 40ms
+      
+      // ROUTING
+      cw(0x00, 0x01); // select page 1
+      cw(0x0e, 0b00001000); // left DAC reconstruction filter routed to LOL
+      cw(0x0f, 0b00001000); // right DAC reconstruction filter routed to LOR
+      cw(0x03, 0b00000000); // DAC PTM_P3/4
+      cw(0x04, 0b00000000); // DAC PTM_P3/4
+
+      // LO GAIN
+      cw(0x00, 0x01);
+      cw(0x12, 0b00000000); // LOL gain 0dB
+      cw(0x13, 0b00000000); // LOR gain 0dB
+
+      // POWER UP
+      // ADC
+      cw(0x00, 0x00); // select page 0
+      cw(0x51, 0b11000000); // power up ADC
+      cw(0x52, 0b00000000); // unmute ADC
+      cw(0x3f, 0b11010100); // power up and route left digital audio to left dac channel and right to right
+      cw(0x40, 0x00); // unmute DAC digital volume
+
+      // DAC VOLUME 0b00000000 = 0dB, 10000001 = -63.5dB, 0b00110000 = +24dB
+      cw(0x00, 0x00); // select page 0
+      cw(0x41, 0b11110001); // LEFT 
+      cw(0x42, 0b11110001); // RIGHT
+      
+      // ADC VOLUME 0b1101000 = -12dB, 0b00000000 = 0dB, 0b0101000 = +20dB
+      cw(0x00, 0x00); // select page 0
+      cw(0x53, 0b01110000); // LEFT
+      cw(0x54, 0b01110000); // RIGHT
+
+      // // STATUS FLAGS
+      // Serial.println("CODEC STATUS");
+      // cw(0x00, 0x00); // select page 0
+      // Serial.println("ADC Flags");
+      // cr(0x24, 1);
+      // Serial.println("DAC Flags");
+      // cr(0x25, 1);
+      // Serial.println("P0_42 - Sticky Flags");
+      // cr(0x2A, 1);
+
+    }
+
+    // void softReset(){}; // 0x00 0x01
+    // void hardReset(){}; // reset pin
+
+    // void powerUp(){};   // power up
+
+    void setMicPgaGain(int gainLeft, int gainRight); // 0 - 47.5dB in 0.5dB steps
+    void setMicPgaGainL(int gain);
+    void setMicPgaGainR(int gain);
+    
+    void mute(bool muteState){
+      muteL(muteState);
+      muteR(muteState);
+    }
+
+    void muteL(bool muteState){
+      uint8_t mutevol = (muteState << 7) + logain[volumeL];
+      cw(0x00, 0x01);
+      cw(0x12, mutevol);
+      muteStateL = muteState;
+    }
+
+    void muteR(bool muteState){
+      uint8_t mutevol = (muteState << 7) + logain[volumeR];
+      cw(0x00, 0x01);
+      cw(0x13, mutevol);
+      muteStateR = muteState;
+    }
+
+    // set LOL and LOR gain from 0 (-6dB) to 35 (29dB)
+    void setLineOutVolume(int volume){
+      setLineOutVolumeL(volume);
+      setLineOutVolumeR(volume);
+      cw(0x00, 0x01);
+      crd(0x12, 1);
+    }
+
+    void setLineOutVolumeL(int volume){
+      volume = max(0, min(35, volume));
+      uint8_t mutevol = (muteStateL << 7) + logain[volume];
+      cw(0x00, 0x01);
+      cw(0x12, mutevol); // LOL gain 0dB
+      volumeL = volume;
+    }
+
+    void setLineOutVolumeR(int volume){
+      volume = max(0, min(35, volume));
+      uint8_t mutevol = (muteStateR << 7) + logain[volume];
+      cw(0x00, 0x01);
+      cw(0x13, mutevol); // LOR gain 0dB
+      volumeR = volume;
+    }
+
+    void volumeUp(){
+      volumeL++;
+      volumeR++;
+      setLineOutVolumeL(volumeL);
+      setLineOutVolumeR(volumeR);
+    }
+
+    void volumeDown(){
+      volumeL--;
+      volumeR--;
+      setLineOutVolumeL(volumeL);
+      setLineOutVolumeR(volumeR);
+    }
+
+    uint8_t getVolumeL(){
+      uint8_t vol[1];
+      cw(0x00, 0x01);
+      cr(0x12, vol, 1);
+      return vol[0];
+    }
+
+    uint8_t getVolumeR(){
+      uint8_t vol[1];
+      cw(0x00, 0x01);
+      cr(0x13, vol, 1);
+      return vol[0];
+    }
+
+  private:
+
+    TwoWire *wire;
+    uint8_t i2cAddress = 0x18;
+
+    bool muteStateL = 0;
+    bool muteStateR = 0;
+    uint8_t volumeL = 0;
+    uint8_t volumeR = 0;
+
+    void cw(unsigned char first, unsigned char second){
+      wire->beginTransmission(i2cAddress);
+      wire->write(first);
+      wire->write(second);
+      int result = wire->endTransmission();
+      if(DEBUG){
+        Serial.print(i2cAddress, HEX);
+        Serial.print(" ");
+        Serial.print(first, HEX);
+        Serial.print(" ");
+        Serial.print(second, HEX);
+        Serial.print(" : ");
+        if(result == 0) {
+          Serial.println("OK");
+        } else {
+          Serial.print("ERROR: ");
+          Serial.println(result);
+        }
+      }
+      delay(5);
+    }
+
+    void cr(unsigned char first, uint8_t result[], size_t len){
+      wire->beginTransmission(i2cAddress);  
+      wire->write(first);  // set register for read
+      wire->endTransmission(false); // false to not release the line
+
+      wire->requestFrom(i2cAddress, len, true);
+
+      wire->readBytes(result, len);
+
+      if(DEBUG){
+        Serial.print(first, HEX);
+        Serial.print(" ");
+
+        for (int i = 0; i < len; i++) {
+          Serial.print(result[i], HEX);
+          Serial.print(" ");
+          Serial.println(result[i], BIN);
+        }
+      }
+    }
+
+    void crd(unsigned char first, size_t len){
+      wire->beginTransmission(0x18);  
+      wire->write(first);  // set register for read
+      wire->endTransmission(false); // false to not release the line
+
+      wire->requestFrom(0x18, len, true); // request bytes from register XY
+      
+      Serial.print(first, HEX);
+      Serial.print(" ");
+
+      byte buff[len];    
+      wire->readBytes(buff, len);
+      for (int i = 0; i < len; i++) {
+        Serial.print(buff[i], HEX);
+        Serial.print(" ");
+        Serial.println(buff[i], BIN);
+      }
+    }
+
+
+//    TLV320AIC3204_Settings settings;
+
+};
+
+
+/*
+  // GENERAL
+  cw(0x00, 0x00); // select page 0
+  cw(0x01, 0x01); // soft reset
+  cw(0x1b, 0b00000000); // select I2S with 16 bit word length
+  cw(0x1d, 0b00000000); // disable loopback
+
+  // POWER and CM
+  cw(0x00, 0x01); // select page 1
+  cw(0x01, 0b00001000); // disable weak (crude) AVdd connection to DVdd
+  cw(0x02, 0b00000001); // enable internal AVdd LDO and enable analog blocks
+  cw(0x09, 0b00001100); // power up LOL, LOR, power down MAL, MAR, HPL, HPR
+  cw(0x0a, 0b00001000); // set full chip CM to 0.75V
+  cw(0x47, 0b00110011); // analog input quick charge time 1.6ms
+
+  // ROUTING
+  cw(0x00, 0x01); // select page 1
+  cw(0x34, 0b10000000); // LEFT MICPGA P route IN1L to LEFT_P with 40k input impedance
+  //cw(0x36, 0b11000000); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+  //cw(0x36, 0b00000011); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+  cw(0x37, 0b10000000); // RIGHT MICPGA P route IN1R to RIGHT_P with 20k input impedance
+  //cw(0x39, 0b11000000); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+  //cw(0x39, 0b00000011); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+  cw(0x3a, 0b00111100); // connect IN2, IN3 weakly to CM
+
+  // GAIN
+  cw(0x00, 0x01); // select page 1
+  cw(0x3b, 0b00000000); // unmute left MICPGA, set gain to 0db
+  cw(0x3c, 0b00000000); // unmute right MICPGA, set gain to 0db
+
+  // VOLUME
+  cw(0x00, 0x01); // select page 1
+  cw(0x16, 0b01110101); // MUTE IN1L to HPL
+  cw(0x17, 0b01110101); // MUTE IN1R to HPR
+
+  // ADC
+  cw(0x00, 0x00); // select page 0
+  cw(0x12, 0x81); // NADC 1
+  cw(0x13, 0x82); // MADC 2
+  cw(0x14, 0b10000000); // OSR ADC 128
+  //cw(0x14, 0b01000000); // OSR ADC 128
+  cw(0x3d, 0b00000001); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
+
+  cw(0x00, 0x01); // select page 1
+  cw(0x3d, 0b00000000); // ADC PTM_R4
+
+  // DAC
+  cw(0x00, 0x00); // select page 0
+  cw(0x0b, 0x81); // NDAC 1
+  cw(0x0c, 0x82); // MDAC 2
+  cw(0x0d, 0x00); // OSR DAC 128
+  cw(0x0e, 0x80); // OSR DAC 128
+  cw(0x1b, 0b00000000); // word length 16bits
+  cw(0x3c, 0b00000001); // PRB_P3
+
+  cw(0x00, 0x01); // select page 1
+  cw(0x7b, 0b00000001); // set REF charging time to 40ms
+  
+  // ROUTING
+  cw(0x00, 0x01); // select page 1
+  cw(0x0e, 0b00001000); // left DAC reconstruction filter routed to LOL
+  cw(0x0f, 0b00001000); // right DAC reconstruction filter routed to LOR
+  cw(0x03, 0b00000000); // DAC PTM_P3/4
+  cw(0x04, 0b00000000); // DAC PTM_P3/4
+
+  // LO GAIN
+  cw(0x00, 0x01);
+  cw(0x12, 0b00000001); // LOL gain 0dB
+  cw(0x13, 0b00000001); // LOR gain 0dB
+
+  // POWER UP
+  // ADC
+  cw(0x00, 0x00); // select page 0
+  cw(0x51, 0b11000000); // power up ADC
+  cw(0x52, 0b00000000); // unmute ADC
+  cw(0x3f, 0b11010100); // power up and route left digital audio to left dac channel and right to right
+  cw(0x40, 0x00); // unmute DAC digital volume
+
+  // DAC VOLUME 0b00000000 = 0dB, 10000001 = -63.5dB, 0b00110000 = +24dB
+  cw(0x00, 0x00); // select page 0
+  cw(0x41, 0b11111001); // LEFT 
+  cw(0x42, 0b11111001); // RIGHT
+  
+  // ADC VOLUME 0b1101000 = -12dB, 0b00000000 = 0dB, 0b0101000 = +20dB
+  cw(0x00, 0x00); // select page 0
+  cw(0x53, 0b01110000); // LEFT
+  cw(0x54, 0b01110000); // RIGHT
+
+*/

soundcube-firmware/ringbuffer.h

@@ -0,0 +1,57 @@
+#pragma once
+
+template<typename T>
+class RingBuffer{
+  public:
+    RingBuffer() {}
+    RingBuffer(size_t size) : bufferSize(size) {}
+
+    void setSize(size_t size) {
+      bufferSize = size;
+    }
+
+    void begin(){
+      buffer = new T[bufferSize];
+    }
+
+    bool push(T data){
+      if(counter < bufferSize){
+        buffer[write] = data;
+        write++; // % bufferSize;
+        if(write == bufferSize) write = 0;
+        counter++;
+        return true;
+      } 
+      return false;
+    }
+    
+    T pop(){
+      T retval = 0;
+      if(counter > 0) {
+        counter--;
+        retval = buffer[read];
+        read++;// % bufferSize;
+        if(read == bufferSize) read = 0;
+      }
+      return retval;
+    }
+	
+    bool isEmpty(){
+      return counter == 0;
+    }
+
+    bool isFull(){
+      return counter == bufferSize;
+    }
+
+    int size(){
+      return counter;
+    }
+
+  private:
+    size_t bufferSize = 0;
+    int counter = 0;
+    int write = 0;
+    int read = 0;
+    T *buffer;
+};

soundcube-firmware/soundcube-firmware.ino

@@ -1,60 +1,352 @@
+#include <ArduinoJson.h>
+#include <ArduinoJson.hpp>
+
 #include <TCA9555.h>
 #include <AS5600.h>
-#include <Adafruit_NeoPixel.h>
+#include <DAC8552.h>
+
+#include <FastLED.h>
 #include <PWMAudio.h>
 #include <I2S.h>
+#include <SPI.h>
+#include <SD.h>
+#include "codec.h"
+#include "wavestream.h"
 
 #define HAPTIC 1
 #define AURAL 1
 #define UI_SAMPLERATE 22050
 
+#define BUFFERSIZE 64
+#define NSTREAMS 16
+
+int16_t buffer[BUFFERSIZE];
+
+WaveStream stream[NSTREAMS];
+
 I2S i2s(INPUT_PULLUP);
 
+TLV320AIC3204 codec;
+
 TCA9555 TCA(0x20, &Wire1);
 AS5600 ENC(&Wire1);
 
+DAC8552 dac(9, &SPI1);
+
 PWMAudio ui_snd(8);
 
-enum BUTTON {CVINL, CVINR, INL, INR, OUTR, OUTL, CVOUTR, CVOUTL, RIGHT, LEFT, SELECT, DEBUG1, DEBUG2, DEBUG3};
+enum STATE {BANK, SAMPLE, SEQUENCE, CTEMPO};
+STATE state = BANK;
 
-Adafruit_NeoPixel edge_pixels(8, 4, NEO_GRB + NEO_KHZ800);
+//enum BUTTON {CVINL, CVINR, INL, INR, OUTR, OUTL, CVOUTR, CVOUTL, RIGHT, LEFT, SELECT, DEBUG1, DEBUG2, DEBUG3};
-Adafruit_NeoPixel ui_pixels(72, 5, NEO_GRB + NEO_KHZ800);
+enum BUTTON {MODE, LOOP, INL, INR, OUTR, OUTL, TEMPO, RESET, BACK, POWER, SELECT, DEBUG1, DEBUG2, DEBUG3};
 
-volatile bool flag = false;
+int lut_ring_cw[48] = {39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,50,49,48,47,46,45,44,43,42,41,40};
-volatile bool click = false;
+int lut_ring_ccw[48] = {40,41,42,43,44,45,46,47,48,49,50,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39};
-volatile bool amp = false;
+int lut_matrix[13] = {56,55,57,58,59,62,61,60,63,64,65,67,66};
+
+int lut_banks[4] = {56,55,67,66};
+int lut_samples[4] = {62,58,60,64};
+
+int active = 0;
+int active_led_ring = 0;
+
+int selected_bank = 0;
+int selected_sample = 0;
+
+uint32_t lastTime = 0;
+int32_t position = 0;
+
+CRGB ui_leds[74];
+CRGB edge_leds[11];
+
+volatile bool buttonChanged = false;
+
+bool ui_click = false;
+bool ui_beep = false;
+bool amp = false;
+bool streams_loaded = false;
+bool speakerToggle = false;
+bool sd_card_detected = false;
+
+bool buttons[16] = {false};
+int buttonsDir[16] = {0};
 
 int counter = 0;
 
-bool buttons[16] = {false};
+int16_t ui_click_snd[UI_SAMPLERATE];
+uint16_t click_length = 0;
 
-int16_t beep[UI_SAMPLERATE];
+int16_t ui_beep_snd[UI_SAMPLERATE];
+uint16_t beep_length = 0;
+
+struct Color {
+  int r;
+  int g;
+  int b;
+  int r_active;
+  int g_active;
+  int b_active;
+};
+
+struct Config {
+  String boxid = "";
+  Color edge_color = {0,0,50,0,50,0};
+  Color ring_color = {0,50,50,0,80,50};
+  String sampleFiles[16];
+  int bpm = 90;
+};
+
+Config config;
+
+struct Sample{
+  float volume = 1.0;
+  WaveStream *file;
+};
+
+Sample samples[NSTREAMS];
+
+struct SequenceStep{
+  int len = 0;
+  Sample *samples[4];
+  void trigger(){
+    for(int i = 0; i < len; i++){
+      samples[i]->file->play(true);
+    }
+  }
+};
+
+SequenceStep steps[16];
+
+void loadConfiguration(Config& config) {
+  File file = SD.open("/config.txt");
+  JsonDocument doc;
+
+  DeserializationError error = deserializeJson(doc, file);
+  if(error) Serial.println(F("Failed to read file, using default configuration"));
+
+  config.edge_color.r = doc["edge"]["color"]["idle"]["r"] | 0;
+  config.edge_color.g = doc["edge"]["color"]["idle"]["g"] | 0;
+  config.edge_color.b = doc["edge"]["color"]["idle"]["b"] | 50;
+  config.edge_color.r_active = doc["edge"]["color"]["active"]["r"] | 0;
+  config.edge_color.g_active = doc["edge"]["color"]["active"]["g"] | 50;
+  config.edge_color.b_active = doc["edge"]["color"]["active"]["b"] | 0;
+  
+  config.ring_color.r = doc["ring"]["color"]["idle"]["r"] | 0;
+  config.ring_color.g = doc["ring"]["color"]["idle"]["g"] | 50;
+  config.ring_color.b = doc["ring"]["color"]["idle"]["b"] | 50;
+  config.ring_color.r_active = doc["ring"]["color"]["active"]["r"] | 0;
+  config.ring_color.g_active = doc["ring"]["color"]["active"]["g"] | 80;
+  config.ring_color.b_active = doc["ring"]["color"]["active"]["b"] | 50;
+
+  JsonArray _sampleFiles = doc["samples"];
+  config.boxid = doc["boxid"].as<String>();
+  int i = 0;
+  for(JsonVariant item : _sampleFiles){
+    config.sampleFiles[i] = item.as<String>();
+    i++;
+  }
+
+  file.close();
+}
+
+size_t count;
+size_t tape_write = 0;
+
+void codec_transmit() {
+  for(int i = 0; i < count; i++){
+    int j = active % NSTREAMS;
+    for(int k = 0; k < NSTREAMS; k++){
+      int16_t sample = 0;
+      sample = stream[k].get();
+      buffer[i] += sample >> 2;
+    }
+  }
+  i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
+}
+
+void codec_receive(){
+  count = i2s.read((uint8_t *)&buffer, BUFFERSIZE * sizeof(int16_t)) * sizeof(uint32_t) / sizeof(int16_t);
+  for(int i = 0; i < count; i++){
+    buffer[i] *= -1;
+  }
+}
 
 void pwm_audio_callback() {
     while (ui_snd.availableForWrite()) {
-      if(click) {
+      if(ui_click || ui_beep) {
-        ui_snd.write(beep[counter]);
+        if(ui_beep) {
-      } else {
+          ui_snd.write(ui_beep_snd[counter]);
-        ui_snd.write(0);
-      }
           counter++;
-      if(counter == UI_SAMPLERATE) counter = 0;
+          if(counter == beep_length) {
+            counter = 0;
+            ui_beep = false;
           }
+          continue;
+        }
+        if(ui_click) {
+          ui_snd.write(ui_click_snd[counter]);
+          counter++;
+          if(counter == click_length) {
+            counter = 0;
+            ui_click = false;
+          }
+        }      
+      } else {
+        digitalWrite(7, LOW);
+        ui_snd.write(0);
+        counter = 0;
+      }
+    }
+}
+
+bool load_ui_sounds(const char* file, int16_t *buffer, uint16_t &length){
+  if(SD.exists(file)) {
+    File f_click = SD.open(file);
+    f_click.seek(44, SeekSet);
+    int click_bytes = 0;
+    while (f_click.available() && click_bytes < UI_SAMPLERATE) {
+      uint8_t samplebyte[2];
+      f_click.read(samplebyte, 2);
+      int16_t sample = (samplebyte[1] << 8) + samplebyte[0];
+      buffer[click_bytes] = sample;
+      click_bytes++;
+    }
+    f_click.close();    
+    length = click_bytes;
+    return true;
+  } else {
+    for(int i = 0; i < UI_SAMPLERATE; i++){
+      float sine_pos = (2.0f * M_PI * 3000.0f * (float)i) / (float)UI_SAMPLERATE;
+      buffer[i] = (int16_t)(sin(sine_pos) * 8000.0f);
+    }
+    Serial.println("Synthesized 8kHz sine into beep array.");
+    length = UI_SAMPLERATE;
+  }
+  return false;
+}
+
+bool load_samples(){
+  for(int i = 0; i < NSTREAMS; i++){
+    stream[i].begin();
+    char filename[64];
+    sprintf(filename, "/sound/%s/%s", config.boxid.c_str(), config.sampleFiles[i].c_str());
+    Serial.println(filename);
+
+    if(SD.exists(filename)){
+      bool loaded = stream[i].load(SD.open(filename));
+      if(loaded) {
+        Serial.print("file read: ");
+        Serial.print(stream[i].wavefile.length);
+        Serial.print(" bytes | ");
+        Serial.print(stream[i].wavefile.samplerate);
+        Serial.print(" kHz | ");
+        Serial.print(stream[i].wavefile.bitspersample);
+        Serial.print(" bits | ");
+        Serial.print(stream[i].wavefile.channels);
+        Serial.print(" channels | ");
+        Serial.print(stream[i].wavefile.blockalign);
+        Serial.println(" bytes");
+        //stream[i].wavefile.loop = true;
+      } else {
+        Serial.println("file loading error");
+      }
+    } else {
+      for(int k = 0; k < 3; k++){
+        digitalWrite(6, HIGH);
+        delay(20);
+        digitalWrite(6, LOW);
+        delay(25);
+      }
+      return false;
+    }
+  }
+  return true;
 }
 
 void tca_irq() {
-  flag = true;
+  buttonChanged = true;
 }
 
-void setup() {
+void speaker(bool state){
+  digitalWrite(12, state ? HIGH : LOW);
+  digitalWrite(13, state ? HIGH : LOW);
+}
 
-  for(int i = 0; i < UI_SAMPLERATE; i++){
+struct Vibration{
-    float sine_pos = (2.0f * M_PI * 8000.0f * (float)i) / (float)UI_SAMPLERATE;
+  int32_t last;
-    beep[i] = (int16_t)(sin(sine_pos) * 8000.0f);
+  bool start = false;
+  bool wait = false;
+  uint16_t on = 0;
+  uint16_t off = 0;
+  int n = 1;
+
+  void update(){
+    int32_t delta = millis() - last;
+
+    if(start && !wait){ 
+      digitalWrite(6, HIGH);
+      start = false;
+      wait = true;
+      last = millis();
     }
 
+    if(delta >= on && wait){
+      digitalWrite(6, LOW);
+      wait = false;
+      n--;
+      last = millis();
+    }
+
+    if(delta >= off && n > 0){
+      start = true;
+      last = millis();
+    }
+  }
+
+  void trigger(int _n, int _on, int _off){
+    n = _n;
+    on = _on;
+    off = _off;
+    start = true;
+  }
+};
+Vibration vibration;
+
+void setup() {
   Serial.begin();
-  delay(2000);
+  delay(1000);
+
+  i2s.setFrequency(48000);
+
+  SPI1.setSCK(10);
+  SPI1.setTX(11);
+  SPI1.begin();
+
+  dac.begin();
+
+  FastLED.addLeds<NEOPIXEL, 4>(edge_leds, 11);
+  FastLED.addLeds<NEOPIXEL, 5>(ui_leds, 74);
+
+  pinMode(12, OUTPUT);
+  pinMode(13, OUTPUT);
+
+  speaker(false);
+
+  pinMode(21, INPUT_PULLUP);
+  sd_card_detected = !digitalRead(21);
+  delay(500);
+
+  bool sdInitialized = SD.begin(22, 23, 24);
+  delay(100);
+  if(!sdInitialized) sdInitialized = SD.begin(22, 23, 24); // hack to prevent SD card from not initializing after soft reset
+
+  if(sdInitialized) loadConfiguration(config);
+
+  if(sdInitialized){
+    load_ui_sounds("/ui/click.wav", ui_click_snd, click_length);
+    load_ui_sounds("/ui/beep.wav", ui_beep_snd, beep_length);
+  }
 
   Serial.println("INIT WIRE");
   Wire1.setSDA(2);
@@ -75,7 +367,8 @@ void setup() {
 
   // Rotary Encoder
   ENC.begin();  //  set direction pin.
-  ENC.setDirection(AS5600_COUNTERCLOCK_WISE);
+  ENC.setDirection(AS5600_CLOCK_WISE);
+  ENC.resetCumulativePosition();
 
   pinMode(6, OUTPUT);  // Vibration Motor
   pinMode(7, OUTPUT);  // UI Amp Enable
@@ -83,118 +376,317 @@ void setup() {
   ui_snd.onTransmit(pwm_audio_callback);
   ui_snd.begin(UI_SAMPLERATE);
 
-  digitalWrite(7, LOW);
+  digitalWrite(7, LOW); // UI amp off
 
-  edge_pixels.begin();  // INITIALIZE NeoPixel strip object (REQUIRED)
+  pinMode(19, OUTPUT); // MCLK enable
-  ui_pixels.begin();    // INITIALIZE NeoPixel strip object (REQUIRED)
+  digitalWrite(19, HIGH); // enable MCLK
 
-  // i2s.setDOUT(14);
+  pinMode(20, OUTPUT); // CODEC reset
-  // i2s.setDIN(15);
+  digitalWrite(20, HIGH);
-  // i2s.setBCLK(16); // 
-  // i2s.swapClocks();
-  // i2s.setMCLK(18);
-  // i2s.setBitsPerSample(16);
-  // i2s.setFrequency(48000);
-  // i2s.setSysClk(48000);
-  // i2s.begin();
 
-  // while (1) {
+  codec.begin(&Wire1);
-  //   int16_t l, r;
+
-  //   i2s.read16(&l, &r);
+  i2s.onTransmit(codec_transmit);
-  //   i2s.write16(l, r);
+  i2s.onReceive(codec_receive);
-  // }
+
+  i2s.setDOUT(15);
+  i2s.setDIN(14);
+  i2s.setBCLK(16); // Note: LRCLK = BCLK + 1
+  i2s.setMCLK(18);
+  i2s.setMCLKmult(512); // 256 = 12.288.000Hz 512 = 25Mhz
+
+  i2s.swapClocks();
+  i2s.setBitsPerSample(16);
+
+  i2s.setBuffers(6, BUFFERSIZE * sizeof(int16_t) / sizeof(uint32_t));
+
+  if(!i2s.begin(48000)){
+    Serial.println("I2S error!");
+    while(100);
+  }
+
+  if(sdInitialized) {
+    streams_loaded = load_samples();
+  }
+
+  if(streams_loaded) {
+    for(int i = 0; i < NSTREAMS; i++){
+      samples[i].file = &stream[i];
+    }
+  }
+
+  digitalWrite(6, HIGH);
+  delay(25);
+  digitalWrite(6, LOW);
+  delay(50);
+  digitalWrite(6, HIGH);
+  delay(25);
+  digitalWrite(6, LOW);
 }
-int active = 0;
-int active_led_ring = 0;
 
-uint32_t lastTime = 0;
+uint32_t last = 0;
-int32_t position = 0;
+int bar = 0;
+int bar_old = -1;
+int set_bar = 0;
+int16_t angle = 0;
+int32_t position_last = 0;
+
+int16_t encdelta_raw = 0;
+int16_t encdeltadiv = 512;
 
 void loop() {
-  edge_pixels.clear();  // Set all pixel colors to 'off'
-  ui_pixels.clear();    // Set all pixel colors to 'off'
-  
   position = ENC.getCumulativePosition();
+  angle = ENC.readAngle();
+  encdelta_raw += (position - position_last);
 
-  // if (millis() - lastTime >= 100)
+  // Serial.print(encdelta_raw);
-  // {
+  // Serial.print(" \t");
-  //   lastTime = millis();
-  //   Serial.print(ENC.getCumulativePosition());
-  //   Serial.print("\t");
-  //   Serial.println(ENC.getRevolutions());
-  // }
 
-  // LED Ring leeren
+  int encdelta = 0;
-  for (int i = 0; i < 48; i++) {
+  if(abs(encdelta_raw) > encdeltadiv) {
-    ui_pixels.setPixelColor(i + 3, edge_pixels.Color(0, 0, 0));
+    encdelta = encdelta_raw > 0 ? 1 : -1;
+    encdelta_raw = 0;
   }
 
-  // flag = true when a button is pushed
+  // Serial.print(angle);
-  if (flag) {
+  // Serial.print(" \t");
-    int val = TCA.read16();
+  // Serial.print(position);
-    Serial.println(val, BIN);
+  // Serial.print(" \t");
+  // Serial.print(position_last);
+  // Serial.print(" \t");
+  // Serial.print(encdelta_raw);
+  // Serial.print(" \t");
+  // Serial.println(encdelta);
 
-    for(int i = 0; i < 16; i++){
+  uint32_t delta_bpm = floor((60000 / config.bpm) / 16);
-      buttons[i] = ~(val >> i) & 0x01;
-      Serial.print(buttons[i]);
-      Serial.print(" ");
-    }
-    Serial.println();
 
-    flag = false;
+  if(millis() - last >= delta_bpm) {
-    if (HAPTIC) {
+    bar = (bar + 1) % 16;
-      digitalWrite(6, HIGH);
+    last = millis();
-    }
-    // Make beep
-    if (AURAL) {
-      digitalWrite(7, HIGH);
-      click = true;
-      delay(50);
-      click = false;
-      digitalWrite(7, LOW);
-    }
-    // Make vibration
-    if(HAPTIC){
-      if(!AURAL) delay(50);
-      digitalWrite(6, LOW);
-    }
-    // Flash led ring 
-    for (int i = 0; i < 48; i++) {
-        ui_pixels.setPixelColor(i + 3, edge_pixels.Color(0, 15, 0));
-    }
-    // Switch through LED matrix
-    if(buttons[RIGHT]) active++;
-    if(buttons[LEFT]) active--;
-    if(active == 13) active = 0;
-    if(active == -1) active = 12;
   }
 
+  sd_card_detected = !digitalRead(21);
+  edge_leds[8] = sd_card_detected ? CRGB(0,10,0) : CRGB(10,0,0);
+
   // EDGE LEDs
   for (int i = 0; i < 8; i++) {
-    edge_pixels.setPixelColor(i, edge_pixels.Color(15, 15, 15));
+    edge_leds[i] = CRGB(config.edge_color.r, config.edge_color.g, config.edge_color.b);
+  }
+  
+  // LED Ring leeren
+  for (int i = 0; i < 48; i++) {
+    ui_leds[i + 3] = CRGB(0, 0, 0);
   }
 
   // Rotary button LEDs
-  ui_pixels.setPixelColor(0, edge_pixels.Color(0, 0, 15));
+  ui_leds[0] = CRGB(0, 0, 0);
-  ui_pixels.setPixelColor(1, edge_pixels.Color(0, 0, 15));
+  ui_leds[1] = CRGB(0, 0, 0);
-  ui_pixels.setPixelColor(2, edge_pixels.Color(0, 0, 15));
+  ui_leds[2] = CRGB(0, 0, 0);
+
+  // buttonChanged = true when a button is pushed
+  if (buttonChanged) {
+    int buttonValues = TCA.read16();
+    
+    bool buttonsNew[16] = {false};
+
+    bool buttonUp = false;
+    bool buttonDown = false;
+
+    for(int i = 0; i < 16; i++){
+      buttonsNew[i] = ~(buttonValues >> i) & 0x01;
+      if(buttonsNew[i] == true && buttons[i] == false) {
+        buttonsDir[i] = -1;
+        buttonDown = true;
+      }
+      if(buttonsNew[i] == false && buttons[i] == true) {
+        buttonsDir[i] = 1;
+        buttonUp = true;
+      }
+      buttons[i] = buttonsNew[i];
+    }
+    
+    // Make vibration
+    if(HAPTIC && buttonDown) {
+      vibration.trigger(1, 25, 25);
+    }
+
+    // Make beep
+    if(AURAL && buttonDown) {
+      digitalWrite(7, HIGH);
+      ui_click = true;
+    }
+
+    if(buttons[TEMPO] && buttonDown){
+      state = CTEMPO;
+    }
+
+    if(buttons[BACK] && buttonDown){
+    }
+
+    switch(state){
+      case BANK:
+        encdeltadiv = 512;
+        encdelta_raw = 0;
+        encdelta = 0;
+        if(buttons[SELECT] && buttonDown){
+          state = SAMPLE;
+        }
+        break;
+      case SAMPLE:
+        encdeltadiv = 512;
+        encdelta_raw = 0;
+        encdelta = 0;
+        if(buttons[SELECT] && buttonDown){
+          state = SEQUENCE;
+        }
+        if(buttons[BACK] && buttonDown){
+          state = BANK;
+        }
+        break;
+      case SEQUENCE:
+        encdeltadiv = 256;
+        encdelta_raw = 0;
+        encdelta = 0;
+        if(buttons[SELECT] && buttonDown){
+          int n = steps[set_bar].len;
+          steps[set_bar].samples[n] = &samples[selected_bank*4 + selected_sample];
+          steps[set_bar].len = (steps[set_bar].len + 1) % 4;
+        }
+        if(buttons[BACK] && buttonDown){
+          state = SAMPLE;
+        }
+        break;
+      case CTEMPO:
+        encdeltadiv = 64;
+        encdelta_raw = 0;
+        encdelta = 0;
+        if(buttons[SELECT] && buttonDown){
+          state = BANK;      
+        }
+        if(buttons[BACK] && buttonDown){
+          state = BANK;
+        }
+        break;
+    }
+
+    // Set bar
+    // if(buttons[BACK]) set_bar++;
+    // if(buttons[POWER]) set_bar--;
+   
+    if(buttons[SELECT]){
+      // Flash encoder leds
+      ui_leds[0] = CRGB(0, 100, 50);
+      ui_leds[1] = CRGB(0, 100, 50);
+      ui_leds[2] = CRGB(0, 100, 50);
+    }
+    
+    if(buttons[DEBUG1]) {
+      Serial.println("vol down");
+      codec.volumeDown();
+    }
+
+    if(buttons[DEBUG3]) {
+      Serial.println("vol up");
+      codec.volumeUp();
+    }
+
+    if(buttons[DEBUG2]) {
+      speakerToggle = !speakerToggle;
+      speaker(speakerToggle);
+    }
+
+
+    Serial.println(codec.getVolumeL());
+
+    buttonChanged = false;
+  }
+
+//  if(position < 0) position += 4096;
+ 
+  switch(state){
+    case BANK:
+      selected_bank += encdelta;
+      if(selected_bank == 4) selected_bank = 0;
+      if(selected_bank == -1) selected_bank = 3;
+      break;
+    case SAMPLE:
+      selected_sample += encdelta;
+      if(selected_sample == 4) selected_sample = 0;
+      if(selected_sample == -1) selected_sample = 3;
+      break;
+    case SEQUENCE:
+      set_bar += encdelta;
+      if(set_bar == 16) set_bar = 0;
+      if(set_bar == -1) set_bar = 15;
+      break;
+    case CTEMPO:
+      config.bpm += encdelta;
+      if(config.bpm < 15) config.bpm = 15;
+      if(config.bpm > 300) config.bpm = 300;
+      break;
+  }
+
+
+  //dac.setValue(0, dactest ? 0 : sin((float)millis() / 100.0f) * 32768 + 32768);
 
   // empty LED matrix
-  for (int i = 0; i < 13; i++) {
+  for (int i = 0; i < 4; i++) {
-    ui_pixels.setPixelColor(i + 3 + 48 + 4, edge_pixels.Color(0, 0, 0));
+    ui_leds[lut_banks[i]] = CRGB(0, 0, 0);
+    ui_leds[lut_samples[i]] = CRGB(0,0,0);
   }
   
   // set active LED matrix LED
-  ui_pixels.setPixelColor(active + 3 + 48 + 4, edge_pixels.Color(255, 255, 255));
+  ui_leds[lut_banks[selected_bank]] = CRGB(100, 50, 50);
+  ui_leds[lut_samples[selected_sample]] = CRGB(100, 0, 50);
 
-  if(position < 0) position += 4096;
+  for(int i = 0; i < 48; i++){
-  active_led_ring = (position / 32) % 48;
+    int step = floor(i/3);
+    if(step == set_bar){
+      ui_leds[lut_ring_cw[i]] = CRGB(config.ring_color.r_active, config.ring_color.g_active, config.ring_color.b_active);
+    }
+    if(step == bar){
+      ui_leds[lut_ring_cw[i]] = CRGB(config.ring_color.r, config.ring_color.g, config.ring_color.b);
+    }
+    if(steps[step].len > 0) {
+      ui_leds[lut_ring_cw[i]] = CRGB(0, 10, 0);
+    }
 
-  // set active LED ring LED
+  }
-  ui_pixels.setPixelColor(active_led_ring + 3, edge_pixels.Color(255, 255, 255));
 
-  edge_pixels.show();
+  if(bar != bar_old){
-  ui_pixels.show();
+    if(steps[bar].len > 0) {
+      steps[bar].trigger();
+      Serial.print("trigger ");
+      Serial.println(bar);
+    }
+  }
 
-  delay(1); // wait 1ms
+  
+  // // set active LED ring LED
+  // for(int i = 0; i < active_led_ring; i++){
+  //   ui_leds[lut_ring_ccw[i]] = CRGB(config.ring_color.r, config.ring_color.g, config.ring_color.b);
+  // }
+
+  FastLED.show();
+  if(streams_loaded) {
+    for(int i = 0; i < NSTREAMS; i++){
+      stream[i].stream();
+    }
+  }
+
+  if(buttonChanged){
+    for(int i = 0; i < 16; i++){
+      if(buttonsDir[i] == 1) buttonsDir[i] = 0;
+    }
+  }
+
+  if(i2s.getOverflow()) Serial.println("overflow");
+  if(i2s.getUnderflow()) Serial.println("underflow");
+
+  //delay(20); // wait 1ms
+  bar_old = bar;
+  vibration.update();
+  position_last = position;
 }
+
+

soundcube-firmware/wavestream.h

@@ -0,0 +1,171 @@
+#pragma once
+
+#include <SD.h>
+#include "ringbuffer.h"
+
+struct WaveFile{
+  File file;
+  
+  char cstart[4];
+  char cwave[4];
+  char cfmt[4];
+
+  bool load(File _file){
+    file = _file;
+
+    // RIFF Header
+    uint8_t start[4];
+    uint8_t size[4];
+    uint8_t wave[4];
+
+    file.seek(0, SeekSet);
+    file.read(start, 4);
+    
+    memcpy(cstart, start, 4);
+    
+    if(strcmp("RIFF", cstart) != 0) return false;
+
+    file.seek(4, SeekSet);
+    file.read(size, 4);
+    length = (size[3] << 24) + (size[2] << 16) + (size[1] << 8) + size[3] - 8;
+    
+    file.seek(8, SeekSet);
+    file.read(wave, 4);
+    memcpy(cwave, wave, 4);
+    if(strcmp("WAVE", cwave) != 0) return false;
+
+    // FORMAT
+    uint8_t fmt[4];
+    uint8_t fmtLen[4];
+    uint8_t fmtTag[2];
+    uint8_t fmtChannels[2];
+    uint8_t fmtSamplerate[4];
+    uint8_t fmtBytesPerSecond[4];
+    uint8_t fmtBlockalign[2];
+    uint8_t fmtBitsPerSample[2];
+
+    file.seek(12, SeekSet);
+    file.read(fmt, 4);
+    memcpy(cfmt, fmt, 4);
+
+    if(strcmp("fmt ", cfmt) != 0) return false;
+
+    file.seek(20, SeekSet);
+    file.read(fmtTag, 4);
+    format = (fmtTag[1] << 8) + fmtTag[0];
+    if(format != 0x0001) return false;
+
+    file.seek(22, SeekSet);
+    file.read(fmtChannels, 2);
+    channels = (fmtChannels[1] << 8) + fmtChannels[0];
+
+    file.seek(24, SeekSet);
+    file.read(fmtSamplerate, 4);
+    samplerate = (fmtSamplerate[3] << 24) + (fmtSamplerate[2] << 16) + (fmtSamplerate[1] << 8) + fmtSamplerate[0];
+
+    file.seek(32, SeekSet);
+    file.read(fmtBlockalign, 2);
+    blockalign = (fmtBlockalign[1] << 8) + fmtBlockalign[0];
+
+    file.seek(34, SeekSet);
+    file.read(fmtBitsPerSample, 2);
+    bitspersample = (fmtBitsPerSample[1] << 8) + fmtBitsPerSample[0];
+    
+    return true;
+  }
+  
+  bool readblock(){
+    uint8_t samplebyte[blockalign];
+
+    file.read(samplebyte, blockalign);
+    if(!file.available() && loop) file.seek(44, SeekSet);
+    if(!file.available() && !loop) {
+      file.seek(44, SeekSet);
+      return false;
+    }
+    
+    for(int i = 0; i < blockalign; i+=2){
+      int16_t sample = (samplebyte[i+1] << 8) + samplebyte[i];
+      buffer.push(sample);
+    }
+    return true;
+  }
+
+  int16_t get(){
+    return buffer.pop();
+  }
+
+  void stop(){
+    file.seek(44, SeekSet);
+  }
+
+  void reset(){
+    file.seek(44, SeekSet);
+  }
+
+  bool loop = false;
+  uint16_t format = 0;
+  uint32_t length = 0;  
+  uint16_t channels = 0;
+  uint32_t samplerate = 0;
+  uint16_t blockalign = 0;
+  uint16_t bitspersample = 0;
+
+  RingBuffer<int16_t> buffer;
+};
+
+class WaveStream{
+  public:
+    WaveStream(){}
+
+    void begin(){
+      wavefile.buffer.setSize(8000);
+      wavefile.buffer.begin();
+    }
+
+    bool load(File _wavefile){
+      if(!wavefile.load(_wavefile)) return false;
+      return true;
+    }
+
+    void toggle(){playing = !playing;}
+
+    void play(bool reset = false){
+      if(reset) wavefile.reset();
+      playing = true;
+    }
+
+    void stop(){
+      playing = false;
+      wavefile.stop();
+    }
+
+    void pause(){playing = false;}
+
+    void stream(){
+      if(!wavefile.buffer.isFull() && playing){
+        int cnt = 0;
+        while (!wavefile.buffer.isFull() && cnt < 6000) {
+          bool ok = wavefile.readblock();
+          if(!ok) playing = false;
+          cnt++;
+        }
+      }
+    }
+    
+    int16_t get(){
+      return playing ? wavefile.get() : 0;
+    }
+
+    bool isPlaying(){
+      return playing;
+    }
+
+  //private:
+
+    WaveFile wavefile;
+
+    bool playing = false;
+
+
+};

soundcube-i2s-test/codec-registers.h

@@ -0,0 +1,110 @@
+#pragma once
+
+#ifndef DEBUG
+#define DEBUG false
+#endif
+
+struct CodecSettings{
+  CodecSettings(uint8_t i2c_address, TwoWire *wire) : wire(wire), i2cAddress(i2c_address) {}
+  TwoWire *wire;
+
+  uint8_t i2cAddress = 0x18;
+  uint8_t page;
+  uint8_t reg;
+  uint8_t len;
+
+  virtual uint8_t get() = 0;
+
+  void write(){
+    selectPage(page);
+    cw(reg, get());
+  }
+
+  void read(uint8_t result[]){
+    selectPage(page);
+    cr(reg, result, len);
+  }
+
+  void selectPage(int page){
+    cw(0x00, page);
+  }
+
+  void cw(unsigned char first, unsigned char second){
+    Wire1.beginTransmission(i2cAddress);
+    Wire1.write(first);
+    Wire1.write(second);
+    int result = Wire1.endTransmission();
+    if(DEBUG){
+      Serial.print(i2cAddress, HEX);
+      Serial.print(" ");
+      Serial.print(first, HEX);
+      Serial.print(" ");
+      Serial.print(second, HEX);
+      Serial.print(" : ");
+      if(result == 0) {
+        Serial.println("OK");
+      } else {
+        Serial.print("ERROR: ");
+        Serial.println(result);
+      }
+    }
+    delay(5);
+  }
+
+  void cr(unsigned char first, uint8_t result[], size_t len){
+    Wire1.beginTransmission(i2cAddress);  
+    Wire1.write(first);  // set register for read
+    Wire1.endTransmission(false); // false to not release the line
+
+    Wire1.requestFrom(i2cAddress, len, true);
+
+    Wire1.readBytes(result, len);
+
+    if(DEBUG){
+      Serial.print(first, HEX);
+      Serial.print(" ");
+
+      for (int i = 0; i < len; i++) {
+        Serial.print(result[i], HEX);
+        Serial.print(" ");
+        Serial.println(result[i], BIN);
+      }
+    }
+  }
+};
+
+struct ClockSettings1 : public CodecSettings{
+  ClockSettings1(uint8_t i2c_address, TwoWire *wire) : CodecSettings(i2c_address, wire) {}
+
+  uint8_t page = 0x00;
+  uint8_t reg = 0x04;
+  uint8_t len = 1;
+
+  enum PLLRange{
+    PLL_HIGH = 0b01000000,
+    PLL_LOW = 0b00000000
+  };
+
+  enum PLLInputClock{
+    PLL_IN_MCLK = 0b00000000,
+    PLL_IN_BCLK = 0b00000100,
+    PLL_IN_GPIO = 0b00001000,
+    PLL_IN_DIN  = 0b00001100
+  };
+
+  enum CodecInputClock{
+    CODEC_IN_MCLK = 0b00000000,
+    CODEC_IN_BCLK = 0b00000001,
+    CODEC_IN_GPIO = 0b00000010,
+    CODEC_IN_PLL  = 0b00000011
+  };
+
+  PLLRange pll_range = PLL_LOW;
+  PLLInputClock pll_input_clock = PLL_IN_MCLK;
+  CodecInputClock codec_input_clock = CODEC_IN_MCLK;
+
+  uint8_t get(){
+    return pll_range | pll_input_clock | codec_input_clock;
+  }
+};
+

soundcube-i2s-test/codec.h

@@ -0,0 +1,291 @@
+#pragma once
+#include <cstdint>
+#include <Wire.h>
+
+#ifndef DEBUG
+#define DEBUG false
+#endif
+
+// class TLV320AIC3204_Settings{
+
+//   public:
+//     TwoWire *wire;
+//     uint8_t i2cAddress = 0x18;
+
+//     ClockSettings1 clock_settings_1 = ClockSettings1(i2cAddress, wire);
+
+// };
+
+class TLV320AIC3204{
+
+  public:
+    TLV320AIC3204() : wire(&Wire) {}
+    TLV320AIC3204(TwoWire *wire) : wire(wire) {}
+
+    void begin(){init();};
+    void begin(TwoWire *_wire) {
+      wire = _wire;
+      init();
+    }
+    void begin(uint8_t i2cAddress, TwoWire *_wire) {
+      i2cAddress = i2cAddress;
+      wire = _wire;
+      init();
+      }
+    
+    void init(){
+            // GENERAL
+      cw(0x00, 0x00); // select page 0
+      cw(0x01, 0x01); // soft reset
+      cw(0x1b, 0b00000000); // select I2S with 16 bit word length
+      cw(0x1d, 0b00000000); // disable loopback
+
+      // POWER and CM
+      cw(0x00, 0x01); // select page 1
+      cw(0x01, 0b00001000); // disable weak (crude) AVdd connection to DVdd
+      cw(0x02, 0b00000001); // enable internal AVdd LDO and enable analog blocks
+      cw(0x09, 0b00001100); // power up LOL, LOR, power down MAL, MAR, HPL, HPR
+      cw(0x0a, 0b00001000); // set full chip CM to 0.75V
+      cw(0x47, 0b00110011); // analog input quick charge time 1.6ms
+
+      // ROUTING
+      cw(0x00, 0x01); // select page 1
+      cw(0x34, 0b10000000); // LEFT MICPGA P route IN1L to LEFT_P with 40k input impedance
+      cw(0x36, 0b10000000); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+      //cw(0x36, 0b00000011); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+      cw(0x37, 0b10000000); // RIGHT MICPGA P route IN1R to RIGHT_P with 20k input impedance
+      cw(0x39, 0b10000000); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+      //cw(0x39, 0b00000011); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+      cw(0x3a, 0b00111100); // connect IN2, IN3 weakly to CM
+
+      // GAIN
+      cw(0x00, 0x01); // select page 1
+      cw(0x3b, 0b00000000); // unmute left MICPGA, set gain to 0db
+      cw(0x3c, 0b00000000); // unmute right MICPGA, set gain to 0db
+
+      // VOLUME
+      cw(0x00, 0x01); // select page 1
+      cw(0x16, 0b01110101); // MUTE IN1L to HPL
+      cw(0x17, 0b01110101); // MUTE IN1R to HPR
+
+      // ADC
+      cw(0x00, 0x00); // select page 0
+      cw(0x12, 0x81); // NADC 1
+      cw(0x13, 0x82); // MADC 2
+      cw(0x14, 0b10000000); // OSR ADC 128
+      //cw(0x14, 0b01000000); // OSR ADC 128
+      cw(0x3d, 0b00000001); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
+
+      cw(0x00, 0x01); // select page 1
+      cw(0x3d, 0b00000000); // ADC PTM_R4
+
+      // DAC
+      cw(0x00, 0x00); // select page 0
+      cw(0x0b, 0x81); // NDAC 1
+      cw(0x0c, 0x82); // MDAC 2
+      cw(0x0d, 0x00); // OSR DAC 128
+      cw(0x0e, 0x80); // OSR DAC 128
+      cw(0x1b, 0b00000000); // word length 16bits
+      cw(0x3c, 0b00000001); // PRB_P3
+
+      cw(0x00, 0x01); // select page 1
+      cw(0x7b, 0b00000001); // set REF charging time to 40ms
+      
+      // ROUTING
+      cw(0x00, 0x01); // select page 1
+      cw(0x0e, 0b00001000); // left DAC reconstruction filter routed to LOL
+      cw(0x0f, 0b00001000); // right DAC reconstruction filter routed to LOR
+      cw(0x03, 0b00000000); // DAC PTM_P3/4
+      cw(0x04, 0b00000000); // DAC PTM_P3/4
+
+      // LO GAIN
+      cw(0x00, 0x01);
+      cw(0x12, 0b00000001); // LOL gain 0dB
+      cw(0x13, 0b00000001); // LOR gain 0dB
+
+      // POWER UP
+      // ADC
+      cw(0x00, 0x00); // select page 0
+      cw(0x51, 0b11000000); // power up ADC
+      cw(0x52, 0b00000000); // unmute ADC
+      cw(0x3f, 0b11010100); // power up and route left digital audio to left dac channel and right to right
+      cw(0x40, 0x00); // unmute DAC digital volume
+
+      // DAC VOLUME 0b00000000 = 0dB, 10000001 = -63.5dB, 0b00110000 = +24dB
+      cw(0x00, 0x00); // select page 0
+      cw(0x41, 0b11111001); // LEFT 
+      cw(0x42, 0b11111001); // RIGHT
+      
+      // ADC VOLUME 0b1101000 = -12dB, 0b00000000 = 0dB, 0b0101000 = +20dB
+      cw(0x00, 0x00); // select page 0
+      cw(0x53, 0b01110000); // LEFT
+      cw(0x54, 0b01110000); // RIGHT
+
+      // // STATUS FLAGS
+      // Serial.println("CODEC STATUS");
+      // cw(0x00, 0x00); // select page 0
+      // Serial.println("ADC Flags");
+      // cr(0x24, 1);
+      // Serial.println("DAC Flags");
+      // cr(0x25, 1);
+      // Serial.println("P0_42 - Sticky Flags");
+      // cr(0x2A, 1);
+
+    }
+
+    // void softReset(){}; // 0x00 0x01
+    // void hardReset(){}; // reset pin
+
+    // void powerUp(){};   // power up
+
+    void setMicPgaGain(int gainLeft, int gainRight); // 0 - 47.5dB in 0.5dB steps
+    void setMicPgaGainL(int gain);
+    void setMicPgaGainR(int gain);
+    
+    void setLineOutVolume(int volumeLeft, int volumeRight);
+    void setLineOutVolumeL(int volume);
+    void setLineOutVolumeR(int volume);
+
+  private:
+
+    TwoWire *wire;
+    uint8_t i2cAddress = 0x18;
+
+
+    void cw(unsigned char first, unsigned char second){
+      wire->beginTransmission(i2cAddress);
+      wire->write(first);
+      wire->write(second);
+      int result = wire->endTransmission();
+      if(DEBUG){
+        Serial.print(i2cAddress, HEX);
+        Serial.print(" ");
+        Serial.print(first, HEX);
+        Serial.print(" ");
+        Serial.print(second, HEX);
+        Serial.print(" : ");
+        if(result == 0) {
+          Serial.println("OK");
+        } else {
+          Serial.print("ERROR: ");
+          Serial.println(result);
+        }
+      }
+      delay(5);
+    }
+
+    void cr(unsigned char first, uint8_t result[], size_t len){
+      wire->beginTransmission(i2cAddress);  
+      wire->write(first);  // set register for read
+      wire->endTransmission(false); // false to not release the line
+
+      wire->requestFrom(i2cAddress, len, true);
+
+      wire->readBytes(result, len);
+
+      if(DEBUG){
+        Serial.print(first, HEX);
+        Serial.print(" ");
+
+        for (int i = 0; i < len; i++) {
+          Serial.print(result[i], HEX);
+          Serial.print(" ");
+          Serial.println(result[i], BIN);
+        }
+      }
+    }
+
+//    TLV320AIC3204_Settings settings;
+
+};
+
+
+/*
+  // GENERAL
+  cw(0x00, 0x00); // select page 0
+  cw(0x01, 0x01); // soft reset
+  cw(0x1b, 0b00000000); // select I2S with 16 bit word length
+  cw(0x1d, 0b00000000); // disable loopback
+
+  // POWER and CM
+  cw(0x00, 0x01); // select page 1
+  cw(0x01, 0b00001000); // disable weak (crude) AVdd connection to DVdd
+  cw(0x02, 0b00000001); // enable internal AVdd LDO and enable analog blocks
+  cw(0x09, 0b00001100); // power up LOL, LOR, power down MAL, MAR, HPL, HPR
+  cw(0x0a, 0b00001000); // set full chip CM to 0.75V
+  cw(0x47, 0b00110011); // analog input quick charge time 1.6ms
+
+  // ROUTING
+  cw(0x00, 0x01); // select page 1
+  cw(0x34, 0b10000000); // LEFT MICPGA P route IN1L to LEFT_P with 40k input impedance
+  //cw(0x36, 0b11000000); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+  //cw(0x36, 0b00000011); // LEFT MICPGA M route CM to LEFT_M with 20k input impedance
+  cw(0x37, 0b10000000); // RIGHT MICPGA P route IN1R to RIGHT_P with 20k input impedance
+  //cw(0x39, 0b11000000); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+  //cw(0x39, 0b00000011); // RIGHT MICPGA M route CM to RIGHT_M with 20k input impedance
+  cw(0x3a, 0b00111100); // connect IN2, IN3 weakly to CM
+
+  // GAIN
+  cw(0x00, 0x01); // select page 1
+  cw(0x3b, 0b00000000); // unmute left MICPGA, set gain to 0db
+  cw(0x3c, 0b00000000); // unmute right MICPGA, set gain to 0db
+
+  // VOLUME
+  cw(0x00, 0x01); // select page 1
+  cw(0x16, 0b01110101); // MUTE IN1L to HPL
+  cw(0x17, 0b01110101); // MUTE IN1R to HPR
+
+  // ADC
+  cw(0x00, 0x00); // select page 0
+  cw(0x12, 0x81); // NADC 1
+  cw(0x13, 0x82); // MADC 2
+  cw(0x14, 0b10000000); // OSR ADC 128
+  //cw(0x14, 0b01000000); // OSR ADC 128
+  cw(0x3d, 0b00000001); // ADC PRB_R3 = 11, PRB_R2 = 10, PRB_R1 = 01
+
+  cw(0x00, 0x01); // select page 1
+  cw(0x3d, 0b00000000); // ADC PTM_R4
+
+  // DAC
+  cw(0x00, 0x00); // select page 0
+  cw(0x0b, 0x81); // NDAC 1
+  cw(0x0c, 0x82); // MDAC 2
+  cw(0x0d, 0x00); // OSR DAC 128
+  cw(0x0e, 0x80); // OSR DAC 128
+  cw(0x1b, 0b00000000); // word length 16bits
+  cw(0x3c, 0b00000001); // PRB_P3
+
+  cw(0x00, 0x01); // select page 1
+  cw(0x7b, 0b00000001); // set REF charging time to 40ms
+  
+  // ROUTING
+  cw(0x00, 0x01); // select page 1
+  cw(0x0e, 0b00001000); // left DAC reconstruction filter routed to LOL
+  cw(0x0f, 0b00001000); // right DAC reconstruction filter routed to LOR
+  cw(0x03, 0b00000000); // DAC PTM_P3/4
+  cw(0x04, 0b00000000); // DAC PTM_P3/4
+
+  // LO GAIN
+  cw(0x00, 0x01);
+  cw(0x12, 0b00000001); // LOL gain 0dB
+  cw(0x13, 0b00000001); // LOR gain 0dB
+
+  // POWER UP
+  // ADC
+  cw(0x00, 0x00); // select page 0
+  cw(0x51, 0b11000000); // power up ADC
+  cw(0x52, 0b00000000); // unmute ADC
+  cw(0x3f, 0b11010100); // power up and route left digital audio to left dac channel and right to right
+  cw(0x40, 0x00); // unmute DAC digital volume
+
+  // DAC VOLUME 0b00000000 = 0dB, 10000001 = -63.5dB, 0b00110000 = +24dB
+  cw(0x00, 0x00); // select page 0
+  cw(0x41, 0b11111001); // LEFT 
+  cw(0x42, 0b11111001); // RIGHT
+  
+  // ADC VOLUME 0b1101000 = -12dB, 0b00000000 = 0dB, 0b0101000 = +20dB
+  cw(0x00, 0x00); // select page 0
+  cw(0x53, 0b01110000); // LEFT
+  cw(0x54, 0b01110000); // RIGHT
+
+*/

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

@@ -4,122 +4,87 @@
 */
 #include <Wire.h>
 #include <I2S.h>
+#include "codec.h"
 
 I2S i2s(INPUT_PULLUP);
 
-#define SIZE 256
+TLV320AIC3204 codec; 
-int16_t buffer[SIZE];
 
-void cw(char first, char second){
+#define SIZE 16
-  Wire1.beginTransmission(0x18);
+#define ECHO 192000
-  Wire1.write(first);
+int16_t buffer[SIZE];
-  Wire1.write(second);
+int16_t buffer2[ECHO];
-  Wire1.endTransmission();
+
-  delay(5);
+int16_t volume = 0;
+size_t count;
+size_t tape_write = 0;
+
+void codec_transmit() {
+  for(int i = 0; i < count; i++){
+    buffer2[tape_write] = buffer[i];
+    tape_write++;
+    if(tape_write == ECHO) tape_write = 0;
+    
+    int tape_read = tape_write + 1;
+    if(tape_read < 0) tape_read += ECHO;
+    buffer[i] += buffer2[tape_read % ECHO];
+  }
+  i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
+}
+
+void codec_receive(){
+  count = i2s.read((uint8_t *)&buffer, SIZE * sizeof(int16_t)) * sizeof(uint32_t) / sizeof(int16_t);
+  for(int i = 0; i < count; i++){
+    buffer[i] *= -1;
+  }
 }
 
 void setup() {
+  i2s.setSysClk(48000);
+
   Serial.begin(115200);
 
-  delay(1000);
+  delay(2000);
 
   Wire1.setSDA(2);
   Wire1.setSCL(3);
   Wire1.begin();
 
-  delay(1000);
+  delay(100);
-
-  // 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
+  digitalWrite(19, HIGH); // enable MCLK
+
   pinMode(20, OUTPUT); // CODEC reset
+  digitalWrite(20, HIGH);
 
-  i2s.setSysClk(48000);
+  codec.begin(&Wire1);
 
-  i2s.setDOUT(14);
+  i2s.onTransmit(codec_transmit);
-  i2s.setDIN(15);
+  i2s.onReceive(codec_receive);
+
+  i2s.setDOUT(15);
+  i2s.setDIN(14);
   i2s.setBCLK(16); // Note: LRCLK = BCLK + 1
   i2s.setMCLK(18);
+  i2s.setMCLKmult(256); // 12.288.000Hz
+
   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
+  if(!i2s.begin(48000)){
-  digitalWrite(20, HIGH);
+    Serial.println("I2S error!");
-  i2s.begin();
+    while(100);
+  }
 
-  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));
-  }
 }
 
+int32_t last = 0;
+int frame = 0;
+
 void loop() {
-  /* Nothing here */
+  frame++;
+  if(frame == 48000) frame = 0;
 }

tools/index_luts.py

@@ -0,0 +1,17 @@
+leds = []
+for i in range(3,51):
+    leds.append(i)
+leds_first = leds[0:37]
+leds_first.reverse()
+leds_last = leds[37:48]
+leds_last.reverse()
+leds_yeah = leds_first + leds_last
+print("int lut_ring_cw[48] = {", end="")
+for i in range(0,48):
+    if i < 47:
+        print(leds_yeah[i], end=",")
+    else:
+        print(leds_yeah[i], end="")
+
+print("};", end="")
+print()

tools/ringbuffer-test.cpp

@@ -0,0 +1,18 @@
+#include <iostream>
+#include "ringbuffer.h"
+
+RingBuffer<int16_t> ringbuffer(25);
+
+int main(){
+	ringbuffer.begin();
+
+	for(int j = 0; j < 3; j++){
+		for(int i = 0; i < 15; i++){
+			if(!ringbuffer.isFull()) ringbuffer.push(i);
+		}
+		std::cout << "---" << std::endl;
+		for(int i = 0; i < 25; i++){
+			if(!ringbuffer.isEmpty()) ringbuffer.pop();
+		}
+	}
+}

tools/ringbuffer.h

@@ -0,0 +1,49 @@
+#pragma once
+#include <iostream>
+
+template<typename T>
+class RingBuffer{
+  public:
+    RingBuffer(size_t size) : bufferSize(size) {}
+
+	void begin(){
+      buffer = new T[bufferSize];
+    }
+
+    bool push(T data){
+		std::cout << "write: " << data << std::endl;
+      if(counter < bufferSize){
+        buffer[write] = data;
+        write = (write+1) % bufferSize;
+        counter++;
+        return true;
+      } 
+      return false;
+    }
+    
+    T pop(){
+      T retval;
+      if(counter > 0) {
+        counter--;
+        retval = buffer[read];
+        read = (read+1) % bufferSize;
+      }
+		std::cout << "read: " << retval << std::endl;
+      return retval;
+    }
+	
+	bool isEmpty(){
+		return counter == 0;
+	}
+
+    bool isFull(){
+      return counter == bufferSize;
+    }
+
+  private:
+    size_t bufferSize = 0;
+    int counter = 0;
+    int write = 0;
+    int read = 0;
+    T *buffer;
+};