audio tryout

Software/UPSoftware/MeyCan.cpp

@@ -1,3 +1,4 @@
+#include "HardwareSerial.h"
 #include <iterator>
 #include "esp32-hal-gpio.h"
 #include "MeyCan.h";

Software/UPSoftware/MeyRule.cpp

@@ -1,104 +0,0 @@
-#include "MeyRule.h"
-#include "MeyCan.h"
-#include <Arduino.h>
-#include <mcp2515.h>;
-
-RemotePinInfo remotePinInfo = RemotePinInfo();
-Rule *rules = NULL;
-
-void PutRule(Rule *rule)
-{
-  if (rules == NULL)
-    rules = rule;
-  else
-    rules->AddRule(rule);
-}
-
-void AddSimple(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId)
-{
-  Rule *rule = new Rule();
-
-  rule->sourceDevId = sourceDevId;
-  rule->sourceMeyPinId = sourceMeyPinId;
-  rule->targetDevId = targetDevId;
-  rule->targetMeyPinId = targetMeyPinId;
-  rule->toggle = false;
-  rule->inverse = false;
-
-  PutRule(rule);
-}
-
-void AddToggle(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId)
-{
-  Rule *rule = new Rule();
-
-  rule->sourceDevId = sourceDevId;
-  rule->sourceMeyPinId = sourceMeyPinId;
-  rule->targetDevId = targetDevId;
-  rule->targetMeyPinId = targetMeyPinId;
-  rule->toggle = true;
-  rule->inverse = false;
-
-  PutRule(rule);
-}
-
-void AddToggleInverse(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId)
-{
-  Rule *rule = new Rule();
-
-  rule->sourceDevId = sourceDevId;
-  rule->sourceMeyPinId = sourceMeyPinId;
-  rule->targetDevId = targetDevId;
-  rule->targetMeyPinId = targetMeyPinId;
-  rule->toggle = true;
-  rule->inverse = true;
-
-  PutRule(rule);
-}
-
-
-
-void CheckRule(uint16_t deviceId, uint8_t dt, uint8_t state, Rule *rule)
-{
-  RemotePinInfo *currentPinState = remotePinInfo.FindOrAdd(rule->targetDevId);
-
-  if (currentPinState == NULL) return;
-
-  bool pinState = state > 0;
-  if (rule->inverse)
-    pinState = !pinState;
-
-  if (rule->toggle)
-    pinState = (currentPinState->getPinState(rule->targetMeyPinId) ^ true);
-
-  BroadcastTriggerMeyPinCanPackage(rule->targetDevId, rule->targetMeyPinId, pinState);
-  currentPinState->setPinState(rule->targetMeyPinId, pinState);
-}
-
-void HandleTriggered(can_frame *frame)
-{
-  if (GetPackageType(frame->can_id) == SWITCH_TRIGGERED_CAN_ID)
-  {
-    RemotePinInfo *currentPinState = remotePinInfo.FindOrAdd(GetDeviceId(frame->can_id) );
-
-    if (currentPinState == NULL)
-      return;
-
-    currentPinState->setPinState(frame->data[0], frame->data[1]);
-  }
-}
-
-void HandleRules(can_frame *frame)
-{
-  HandleTriggered(frame);
-
-  if (rules == NULL) return;
-  if (GetPackageType(frame->can_id) == SWITCH_TRIGGERED_CAN_ID)
-  {
-    uint16_t deviceId =  GetDeviceId(frame->can_id);
-    uint8_t dt = frame->data[1];
-    uint8_t state  = frame->data[0];
-
-    rules->Traverse(deviceId, dt, state, CheckRule);
-  }
-}

Software/UPSoftware/MeyRule.h

@@ -1,111 +0,0 @@
-#ifndef MEYRULE_H
-#define MEYRULE_H
-
-#include <Arduino.h>
-#include <mcp2515.h>;
-
-struct Rule
-{
-  uint16_t sourceDevId;
-  byte sourceMeyPinId;
-  uint16_t targetDevId;
-  byte targetMeyPinId;
-  bool toggle;
-  bool inverse;
-  Rule *nextRule = NULL;
-
-  void AddRule(Rule *rule)
-  {
-    if (this->nextRule == NULL)
-    {
-      this->nextRule = rule;
-      rule->nextRule = NULL;
-    } else {
-      this->nextRule->AddRule(rule);
-    }
-  }
-
-  void Traverse( uint16_t deviceId,  uint8_t dt, uint8_t state,  void (*handle)(uint16_t, uint8_t, uint8_t, Rule*))
-  {
-
-    if ( this->sourceDevId == deviceId && this->sourceMeyPinId == state)
-      handle(deviceId, dt, state, this);
-
-    if (this->nextRule != NULL)
-      this->nextRule->Traverse(deviceId, dt, state, handle);
-
-  }
-};
-
-
-typedef struct RemotePinInfo
-{
-  const byte MAX_REMOTE_PIN_COUNT = 64;
-  uint16_t DeviceId = 0; //  the id of the device
-  uint8_t pinState = 0; // bitmap of 8 MeyPin states of the device. 0000 0100, MeyPin #3 is HIGH in this example
-  RemotePinInfo *next = NULL;
-
-  bool getPinState(byte meyPin)
-  {
-    return (this->pinState >> (meyPin - 1)) & 1;
-  }
-
-  void setPinState(byte meyPin, bool state)
-  {
-    if (state)
-      this->pinState = this->pinState | (1 << (meyPin - 1)); // 0001 0000
-    else
-      this->pinState = this->pinState & (~(1 << (meyPin - 1))); // 1110 1111 -> not
-  }
-
-
-  int16_t Count()
-  {
-    if (this->next == NULL) return 1;
-    return this->next->Count() + 1;
-  }
-
-  RemotePinInfo* FindOrAdd(uint16_t deviceId, byte count = 0)
-  {
-    if (count > MAX_REMOTE_PIN_COUNT)
-      return NULL;
-
-
-    if (this->DeviceId == 0 && this->pinState == 0)
-    {
-      this->DeviceId = deviceId;
-      this->pinState = 0;
-    }
-
-    if (this->DeviceId == deviceId)
-    {
-      //ToggleDebug();
-      return this;
-    }
-
-    if (next != NULL)
-    {
-      return next->FindOrAdd(deviceId, count + 1);
-    }
-
-    RemotePinInfo *theNext = new RemotePinInfo;
-    theNext->DeviceId = deviceId;
-    theNext->pinState = 0;
-    theNext->next = NULL;
-
-    this->next = theNext;
-    return this->next;
-  }
-
-};
-
-extern RemotePinInfo remotePinInfo;
-extern Rule *rules;
-
-void AddSimple(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId);
-void AddToggle(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId);
-void AddToggleInverse(uint16_t sourceDevId, byte sourceMeyPinId, uint16_t targetDevId, byte targetMeyPinId);
-void HandleRules(can_frame *frame);
-void PutRule(Rule *rule);
-void CheckRule(uint16_t deviceId, uint8_t dt, uint8_t state, Rule *rule);
-#endif

Software/UPSoftware/UPSoftware.ino

@@ -1,11 +1,65 @@
 #include <Arduino.h>
-#include "driver/twai.h"
+#include <driver/i2s.h>
+#include "opus.h"
+#include "opus_data.h"
 #include "MeyCan.h"
 
-// https://github.com/espressif/arduino-esp32/blob/master/libraries/ESP32/examples/TWAI/TWAIreceive/TWAIreceive.ino
 
-#define RX_PIN 2
-#define TX_PIN 3
+constexpr int RX_PIN = 2;  // CAN_TRANCEIVER_RX_PIN
+constexpr int TX_PIN = 3;  // CAN_TRANCEIVER_TX_PIN
+bool driver_installed = false;
+
+constexpr i2s_port_t I2S_PORT = I2S_NUM_0;  // I2S-Peripherie-Instanz (0 = erster Controller)
+constexpr int I2S_DIN = 9;                  // GPIO-Pin für serielle Datenleitug (Data-Out → DAC)
+constexpr int I2S_BCLK = 10;                 // GPIO-Pin für Bit-Clock (BCLK)
+constexpr int I2S_LRC = 20;                  // GPIO-Pin für Word-Select / Left-Right-Clock
+constexpr int SAMPLE_RATE = 48000;          // Abtastrate in Hz (Opus-Standard: 48 kHz)
+constexpr int CHANNELS = 1;                 // Anzahl Audiokanäle (1 = Mono)
+constexpr int MAX_FRAME = 5760;             // Maximale Samples pro Opus-Frame (120 ms @ 48 kHz)
+          float OUTPUT_GAIN = 0.02f;        // Lautstärkeskalierung vor I2S-Ausgabe (0.0–1.0)
+
+static OpusDecoder *dec = nullptr;
+static int16_t pcm[MAX_FRAME];
+static int16_t stereo[MAX_FRAME * 2];
+
+static void i2s_setup() {
+  i2s_config_t cfg = {};
+  cfg.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX);
+  cfg.sample_rate = SAMPLE_RATE;
+  cfg.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT;
+  cfg.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT;
+  cfg.communication_format = I2S_COMM_FORMAT_STAND_I2S;
+  cfg.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1;
+  cfg.dma_buf_count = 8;
+  cfg.dma_buf_len = 512;
+  cfg.tx_desc_auto_clear = true;
+
+  i2s_pin_config_t pins = {};
+  pins.bck_io_num = I2S_BCLK;
+  pins.ws_io_num = I2S_LRC;
+  pins.data_out_num = I2S_DIN;
+  pins.data_in_num = I2S_PIN_NO_CHANGE;
+
+  i2s_driver_install(I2S_PORT, &cfg, 0, nullptr);
+  i2s_set_pin(I2S_PORT, &pins);
+  i2s_zero_dma_buffer(I2S_PORT);
+}
+
+static void decode_packet(const uint8_t *pkt, size_t len) {
+  int samples = opus_decode(dec, pkt, (opus_int32)len, pcm, MAX_FRAME, 0);
+  if (samples <= 0) return;
+
+  // Mono → Stereo mit Gain
+  for (int i = 0; i < samples; i++) {
+    int16_t s = (int16_t)(pcm[i] * OUTPUT_GAIN);
+    stereo[i * 2] = s;
+    stereo[i * 2 + 1] = s;
+  }
+
+  size_t written;
+  i2s_write(I2S_PORT, stereo, samples * 2 * sizeof(int16_t), &written, portMAX_DELAY);
+   CheckMeyPinsTriggered();
+}
 
 void DebugBlink(int d) {
   pinMode(20, OUTPUT);
@@ -18,21 +72,12 @@ void DebugBlink(int d) {
   }
 }
 
-bool driver_installed = false;
-void setup() {
-  Serial.begin(9600);
-  SPI.begin();
-
-  // Explicit GND for LED and Input
-  pinMode(21, OUTPUT);
-  digitalWrite(21, LOW);
-
+void ConfigureAndSetupMeyCan() {
   // Initialize configuration structures using macro initializers
   twai_general_config_t g_config = TWAI_GENERAL_CONFIG_DEFAULT((gpio_num_t)TX_PIN, (gpio_num_t)RX_PIN, TWAI_MODE_NORMAL);
   twai_timing_config_t t_config = TWAI_TIMING_CONFIG_1MBITS();  //Look in the api-reference for other speed sets.
   twai_filter_config_t f_config = TWAI_FILTER_CONFIG_ACCEPT_ALL();
 
-
   if (twai_driver_install(&g_config, &t_config, &f_config) == ESP_OK) {
     Serial.println("Driver installed");
   } else {
@@ -40,8 +85,6 @@ void setup() {
     return;
   }
 
-
-
   esp_err_t e = twai_start();
   // Start TWAI driver
   if (e == ESP_OK) {
@@ -51,32 +94,127 @@ void setup() {
     return;
   }
 
-
-  SetDevicedId(0x05, 0x1F);
+  SetDevicedId(0x09, 0x09);
 
   SetMeyPin(1, 5);
   SetMeyPin(2, 6);
   SetMeyPin(3, 7);
   SetMeyPin(4, 8);
-  SetMeyPin(5, 9);
-  SetMeyPin(6, 10);
-  SetMeyPin(7, 20);
 
   SetupMeyCan(8, 1, 3);
+
 }
 
-twai_message_t frame;
-void loop() {
+// Ogg-Container-Format:
+//   Der Stream besteht aus aufeinanderfolgenden "Pages" (Seiten).
+//   Jede Page beginnt mit dem 4-Byte-Capture-Pattern "OggS".
+//   Der Page-Header ist immer mindestens 27 Bytes lang:
+//     Byte  0– 3: "OggS" (Capture Pattern)
+//     Byte  4    : Stream-Struktur-Version (immer 0)
+//     Byte  5    : Header-Type-Flag (0=normal, 1=continued, 2=first, 4=last)
+//     Byte  6–13 : Granule Position (Zeitstempel, 8 Bytes)
+//     Byte 14–17 : Stream Serial Number
+//     Byte 18–21 : Page Sequence Number
+//     Byte 22–25 : CRC Checksum
+//     Byte 26    : Anzahl der Segmente (num_segs)
+//   Danach folgt die Segment-Tabelle (num_segs Bytes),
+//   und anschließend die eigentlichen Nutzdaten.
+//
+//   Ogg-Lacing-Regel für Paketgrenzen:
+//     Jeder Eintrag in der Segment-Tabelle gibt die Größe eines Segments an (0–255).
+//     Ist ein Segment genau 255 Bytes → das Paket geht weiter (nächstes Segment gehört dazu).
+//     Ist ein Segment < 255 Bytes    → das Paket endet hier.
+//   So können Pakete größer als 255 Bytes über mehrere Segmente verteilt sein.
+//
+//   Bei Opus in Ogg sind die ersten zwei Pages immer Metadaten:
+//     Page 0: OpusHead  (Samplerate, Kanalanzahl, Preskip …)
+//     Page 1: OpusTags  (Künstler, Titel, Encoder …)
+//   Ab Page 2 folgen die eigentlichen Audio-Pakete (je ~20 ms Opus-Frame).
+static void play_ogg_opus(const uint8_t *buf, size_t buf_len) {
+  size_t pos = 0;  // aktuelle Leseposition im Buffer
+  int page_n = 0;  // Page-Zähler (0 und 1 sind Header-Pages)
 
-  if (!driver_installed) {
-    // Driver not installed
-    DebugBlink(2000);
+  while (pos + 27 <= buf_len) {
+
+    // --- 1. Capture Pattern "OggS" suchen ---
+    // Falls pos nicht direkt auf eine Page zeigt, byte-weise vorwärts suchen.
+    if (!(buf[pos] == 'O' && buf[pos + 1] == 'g' && buf[pos + 2] == 'g' && buf[pos + 3] == 'S')) {
+      pos++;
+      continue;
+    }
+
+    // --- 2. Page-Header lesen ---
+    uint8_t num_segs = buf[pos + 26];      // Anzahl Segmente aus Byte 26
+    size_t hdr_end = pos + 27 + num_segs;  // Ende des Headers (= Beginn der Nutzdaten)
+    if (hdr_end > buf_len) break;
+
+    // Gesamtgröße der Nutzdaten = Summe aller Segmentlängen
+    size_t data_size = 0;
+    for (int s = 0; s < num_segs; s++) data_size += buf[pos + 27 + s];
+
+    // --- 3. Audio-Pages verarbeiten (Page 0+1 sind Metadaten → überspringen) ---
+    if (page_n >= 2) {
+      size_t pkt_start = hdr_end;  // Startposition des aktuellen Pakets
+      size_t pkt_size = 0;         // akkumulierte Paketgröße über Segmente
+
+      for (int s = 0; s < num_segs; s++) {
+        uint8_t seg = buf[pos + 27 + s];  // Größe dieses Segments
+        pkt_size += seg;
+
+        if (seg < 255) {
+          // Paketende erreicht → vollständiges Opus-Paket dekodieren und ausgeben
+          decode_packet(buf + pkt_start, pkt_size);
+          pkt_start += pkt_size;  // nächstes Paket beginnt direkt dahinter
+          pkt_size = 0;
+        }
+        // seg == 255 → Paket geht im nächsten Segment weiter (Lacing)
+      }
+    }
+
+    // --- 4. Zur nächsten Page springen ---
+    pos = hdr_end + data_size;
+    page_n++;
+  }
+}
+
+int changeVolume = 0;
+static void canTaskFunc(void *) {
+  twai_message_t frame;
+  for (;;) {
+    // blockiert ohne CPU-Last; der interne TWAI-Interrupt weckt den Task sobald ein Frame ankommt
+    if (twai_receive(&frame, portMAX_DELAY) == ESP_OK) {
+      HandleFrame(&frame);
+
+      if (changeVolume > 20)
+        changeVolume = 0;
+
+      OUTPUT_GAIN = 0.1f + changeVolume*0.1f;
+      changeVolume++;
+    }
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  i2s_setup();
+
+  // Explicit GND for LED and Input
+  pinMode(21, OUTPUT);
+  digitalWrite(21, LOW);
+
+  int err;
+  dec = opus_decoder_create(SAMPLE_RATE, CHANNELS, &err);
+  if (err != OPUS_OK) {
+    Serial.printf("opus_decoder_create failed: %d\n", err);
     return;
   }
+  Serial.println("Opus playback started");
+  ConfigureAndSetupMeyCan();
 
-  CheckMeyPinsTriggered();
-  if (twai_receive(&frame, 0) == ESP_OK) {
+  xTaskCreate(canTaskFunc, "can", 4096, nullptr, 5, nullptr);
+}
 
-    HandleFrame(&frame);
-  }
+void loop() {
+  play_ogg_opus(music_opus, music_opus_len);
+  opus_decoder_ctl(dec, OPUS_RESET_STATE);
 }

Software/UPSoftware/examples/OpusLoopbackEsp32C3/OpusLoopbackEsp32C3.ino

@@ -0,0 +1,56 @@
+#include <Arduino.h>
+#include <AudioTools.h>
+#include <AudioTools/AudioCodecs/CodecOpus.h>
+
+using namespace audio_tools;
+
+constexpr int I2S_BCLK = 6;
+constexpr int I2S_LRC = 7;
+constexpr int I2S_DIN = 5;
+
+// Keep the test intentionally light so it is realistic for an ESP32-C3.
+AudioInfo audioInfo(16000, 1, 16);
+SineWaveGenerator<int16_t> sineWave(10000);
+GeneratedSoundStream<int16_t> source(sineWave);
+I2SStream i2s;
+OpusAudioEncoder opusEncoder;
+OpusAudioDecoder opusDecoder;
+EncodedAudioStream decodedAudio(&i2s, &opusDecoder);
+EncodedAudioStream encodedAudio(&decodedAudio, &opusEncoder);
+StreamCopy copier(encodedAudio, source);
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  auto i2sConfig = i2s.defaultConfig(TX_MODE);
+  i2sConfig.copyFrom(audioInfo);
+  i2sConfig.pin_bck = I2S_BCLK;
+  i2sConfig.pin_ws = I2S_LRC;
+  i2sConfig.pin_data = I2S_DIN;
+  i2sConfig.buffer_count = 8;
+  i2sConfig.buffer_size = 256;
+  i2s.begin(i2sConfig);
+
+  auto sineConfig = sineWave.defaultConfig();
+  sineConfig.copyFrom(audioInfo);
+  sineWave.begin(sineConfig, N_B4);
+
+  auto &encoderConfig = opusEncoder.config();
+  encoderConfig.copyFrom(audioInfo);
+  encoderConfig.application = OPUS_APPLICATION_RESTRICTED_LOWDELAY;
+  encoderConfig.bitrate = 24000;
+  encoderConfig.complexity = 1;
+  encoderConfig.frame_sizes_ms_x2 = OPUS_FRAMESIZE_20_MS;
+
+  decodedAudio.begin(audioInfo);
+  encodedAudio.begin(audioInfo);
+
+  Serial.println("Opus loopback test started");
+}
+
+void loop() {
+  if (copier.copy() == 0) {
+    delay(1);
+  }
+}

Software/UPSoftware/examples/OpusLoopbackEsp32C3/README.md

@@ -0,0 +1,26 @@
+This sketch is a minimal ESP32-C3 Opus codec smoke test.
+
+What it does:
+- Generates a sine wave locally
+- Encodes it with Opus
+- Decodes it immediately again
+- Sends the decoded PCM to I2S
+
+Why this example:
+- It tests the raw Opus codec path without Ogg or CAN framing
+- It is closer to the later Pi -> CAN -> ESP32 decoder path than MP3
+- It keeps CPU load down by using 16 kHz mono and low encoder complexity
+
+Expected hardware:
+- ESP32-C3
+- I2S DAC / amp on:
+  - BCLK = GPIO 6
+  - LRCK = GPIO 7
+  - DIN = GPIO 5
+
+Required Arduino libraries:
+- `arduino-audio-tools`
+- `arduino-libopus`
+
+If this sketch runs and outputs a stable sine tone, the basic Opus encode/decode
+chain is working on the ESP32-C3.