WIP: Audio voice memo functionality

src/input/InputBroker.h

@@ -39,6 +39,7 @@ enum input_broker_event {
 #define INPUT_BROKER_MSG_FN_SYMBOL_ON 0xf1
 #define INPUT_BROKER_MSG_FN_SYMBOL_OFF 0xf2
 #define INPUT_BROKER_MSG_BLUETOOTH_TOGGLE 0xAA
+#define INPUT_BROKER_MSG_VOICEMEMO 0xAD
 #define INPUT_BROKER_MSG_TAB 0x09
 #define INPUT_BROKER_MSG_EMOTE_LIST 0x8F
 

src/input/TCA8418Keyboard.cpp

@@ -28,18 +28,18 @@ static unsigned char TCA8418TapMap[_TCA8418_NUM_KEYS][13] = {
 };
 
 static unsigned char TCA8418LongPressMap[_TCA8418_NUM_KEYS] = {
-    Key::ESC,   // 1
-    Key::UP,    // 2
-    Key::NONE,  // 3
-    Key::LEFT,  // 4
-    Key::NONE,  // 5
-    Key::RIGHT, // 6
-    Key::NONE,  // 7
-    Key::DOWN,  // 8
-    Key::NONE,  // 9
-    Key::BSP,   // *
-    Key::NONE,  // 0
-    Key::NONE,  // #
+    Key::ESC,       // 1
+    Key::UP,        // 2
+    Key::NONE,      // 3
+    Key::LEFT,      // 4
+    Key::NONE,      // 5
+    Key::RIGHT,     // 6
+    Key::NONE,      // 7
+    Key::DOWN,      // 8
+    Key::NONE,      // 9
+    Key::BSP,       // *
+    Key::VOICEMEMO, // 0
+    Key::NONE,      // #
 };
 
 TCA8418Keyboard::TCA8418Keyboard()

src/input/TCA8418KeyboardBase.h

@@ -25,6 +25,7 @@ class TCA8418KeyboardBase
         BT_TOGGLE = 0xAA,
         GPS_TOGGLE = 0x9E,
         MUTE_TOGGLE = 0xAC,
+        VOICEMEMO = 0xAD,
         SEND_PING = 0xAF,
         BL_TOGGLE = 0xAB
     };

src/input/TDeckProKeyboard.cpp

@@ -56,8 +56,8 @@ static unsigned char TDeckProTapMap[_TCA8418_NUM_KEYS][5] = {
     {0x00, 0x00, 0x00}, // Ent, $, m, n, b, v, c, x, z, alt
     {0x00, 0x00, 0x00},
     {0x00, 0x00, 0x00},
-    {0x20, 0x00, 0x00},
-    {0x00, 0x00, '0'},
+    {0x20, 0x00, Key::VOICEMEMO},
+    {Key::VOICEMEMO, 0x00, 0x00},
     {0x00, 0x00, 0x00} // R_Shift, sym, space, mic, L_Shift
 };
 

src/input/TLoraPagerKeyboard.cpp

@@ -56,7 +56,7 @@ static unsigned char TLoraPagerTapMap[_TCA8418_NUM_KEYS][3] = {{'q', 'Q', '1'},
                                                                {'z', 'Z', '_'},
                                                                {'x', 'X', '$'},
                                                                {'c', 'C', ';'},
-                                                               {'v', 'V', '?'},
+                                                               {'v', 'V', Key::VOICEMEMO},
                                                                {'b', 'B', '!'},
                                                                {'n', 'N', ','},
                                                                {'m', 'M', '.'},

src/input/kbI2cBase.cpp

@@ -163,6 +163,16 @@ int32_t KbI2cBase::runOnce()
                         e.kbchar = key.key;
                     }
                     break;
+                case 'v': // sym v - voice memo
+                    if (is_sym) {
+                        e.inputEvent = INPUT_BROKER_ANYKEY;
+                        e.kbchar = INPUT_BROKER_MSG_VOICEMEMO;
+                        is_sym = false; // reset sym state after second keypress
+                    } else {
+                        e.inputEvent = INPUT_BROKER_ANYKEY;
+                        e.kbchar = key.key;
+                    }
+                    break;
                 case 0x13: // Code scanner says the SYM key is 0x13
                     is_sym = !is_sym;
                     e.inputEvent = INPUT_BROKER_ANYKEY;
@@ -370,6 +380,10 @@ int32_t KbI2cBase::runOnce()
 
         if (i2cBus->available()) {
             char c = i2cBus->read();
+            // Debug: log every key press
+            if (c != 0x00) {
+                LOG_DEBUG("T-Deck KB: key=0x%02X ('%c'), is_sym=%d", (uint8_t)c, (c >= 0x20 && c < 0x7f) ? c : '?', is_sym);
+            }
             InputEvent e = {};
             e.inputEvent = INPUT_BROKER_NONE;
             e.source = this->_originName;
@@ -443,6 +457,17 @@ int32_t KbI2cBase::runOnce()
                     e.kbchar = c;
                 }
                 break;
+            case 0x76: // letter v. voice memo trigger
+                if (is_sym) {
+                    is_sym = false;
+                    e.inputEvent = INPUT_BROKER_ANYKEY;
+                    e.kbchar = INPUT_BROKER_MSG_VOICEMEMO;
+                    LOG_DEBUG("T-Deck: Sym+V pressed, sending VOICEMEMO 0x%02X", INPUT_BROKER_MSG_VOICEMEMO);
+                } else {
+                    e.inputEvent = INPUT_BROKER_ANYKEY;
+                    e.kbchar = c;
+                }
+                break;
             case 0x1b: // ESC
                 e.inputEvent = INPUT_BROKER_CANCEL;
                 break;
@@ -466,9 +491,11 @@ int32_t KbI2cBase::runOnce()
                 e.inputEvent = INPUT_BROKER_RIGHT;
                 e.kbchar = 0;
                 break;
-            case 0xc: // Modifier key: 0xc is alt+c (Other options could be: 0xea = shift+mic button or 0x4 shift+$(speaker))
+            case 0x3F: // Sym key on some T-Deck variants (sends '?')
+            case 0xc:  // Modifier key: 0xc is alt+c (Other options could be: 0xea = shift+mic button or 0x4 shift+$(speaker))
                 // toggle moddifiers button.
                 is_sym = !is_sym;
+                LOG_DEBUG("T-Deck: Modifier key pressed, is_sym now=%d", is_sym);
                 e.inputEvent = INPUT_BROKER_ANYKEY;
                 e.kbchar = is_sym ? INPUT_BROKER_MSG_FN_SYMBOL_ON   // send 0xf1 to tell CannedMessages to display that the
                                   : INPUT_BROKER_MSG_FN_SYMBOL_OFF; // modifier key is active

src/modules/CannedMessageModule.h

@@ -89,9 +89,8 @@ class CannedMessageModule : public SinglePortModule, public Observable<const UIF
     void handleGetCannedMessageModuleMessages(const meshtastic_MeshPacket &req, meshtastic_AdminMessage *response);
     void handleSetCannedMessageModuleMessages(const char *from_msg);
 
-#ifdef RAK14014
+    // Get current run state (used by VoiceMemoModule to avoid conflicts)
     cannedMessageModuleRunState getRunState() const { return runState; }
-#endif
 
     // === Packet Interest Filter ===
     virtual bool wantPacket(const meshtastic_MeshPacket *p) override

src/modules/Modules.cpp

@@ -87,6 +87,9 @@
 #if defined(USE_SX1280) && !MESHTASTIC_EXCLUDE_AUDIO
 #include "modules/esp32/AudioModule.h"
 #endif
+#if defined(HAS_I2S) && !MESHTASTIC_EXCLUDE_VOICEMEMO
+#include "modules/VoiceMemoModule.h"
+#endif
 #if !MESHTASTIC_EXCLUDE_PAXCOUNTER
 #include "modules/esp32/PaxcounterModule.h"
 #endif
@@ -285,6 +288,9 @@ void setupModules()
 #if defined(USE_SX1280) && !MESHTASTIC_EXCLUDE_AUDIO
     audioModule = new AudioModule();
 #endif
+#if defined(HAS_I2S) && !MESHTASTIC_EXCLUDE_VOICEMEMO
+    voiceMemoModule = new VoiceMemoModule();
+#endif
 #if !MESHTASTIC_EXCLUDE_PAXCOUNTER
     if (moduleConfig.has_paxcounter && moduleConfig.paxcounter.enabled) {
         paxcounterModule = new PaxcounterModule();

src/modules/VoiceMemoModule.h

@@ -0,0 +1,180 @@
+#pragma once
+
+#include "SinglePortModule.h"
+#include "concurrency/OSThread.h"
+#include "configuration.h"
+#include "input/InputBroker.h"
+#include "mesh/generated/meshtastic/module_config.pb.h"
+
+#if defined(ARCH_ESP32) && defined(HAS_I2S) && !MESHTASTIC_EXCLUDE_VOICEMEMO
+
+#include <Arduino.h>
+#include <ButterworthFilter.h>
+#include <OLEDDisplay.h>
+#include <OLEDDisplayUi.h>
+#include <codec2.h>
+#include <driver/i2s.h>
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+/**
+ * VoiceMemoModule - Store and forward short codec2 encoded audio messages
+ *
+ * Unlike the existing AudioModule which is designed for real-time push-to-talk,
+ * this module is designed for short voice memos that are:
+ * - Recorded when the user holds Shift+Space
+ * - Encoded with Codec2 for compression
+ * - Sent over the mesh with hop_limit=0 (local only)
+ * - Stored on receiving devices for later playback
+ * - Played back when user long-presses on the notification
+ */
+
+// Voice memo states
+enum class VoiceMemoState { IDLE, RECORDING, SENDING, RECEIVING, PLAYING };
+
+// Codec2 magic header for voice memos
+const char VOICEMEMO_MAGIC[4] = {0xc0, 0xde, 0xc2, 0x4d}; // c0dec2M (M for Memo)
+
+struct VoiceMemoHeader {
+    char magic[4];
+    uint8_t mode;       // Codec2 mode
+    uint8_t sequence;   // Packet sequence number (for multi-packet memos)
+    uint8_t totalParts; // Total number of packets in this memo (0 = unknown/streaming)
+    uint8_t memoId;     // Unique ID for this recording session (to identify related packets)
+};
+
+// Maximum recording time in seconds
+#define VOICEMEMO_MAX_RECORD_SECS 10
+#define VOICEMEMO_ADC_BUFFER_SIZE 320       // Codec2 samples per frame
+#define VOICEMEMO_UPSAMPLE_BUFFER_SIZE 3600 // 320 * (44100/8000) * 2 (stereo) ≈ 3528, rounded up
+#define VOICEMEMO_I2S_PORT I2S_NUM_0
+// Codec2 mode - use protobuf enum minus 1 to get codec2 library mode
+#define VOICEMEMO_CODEC2_MODE (meshtastic_ModuleConfig_AudioConfig_Audio_Baud_CODEC2_700 - 1)
+
+// Storage for received voice memos
+#define VOICEMEMO_MAX_STORED 5
+struct StoredVoiceMemo {
+    NodeNum from;
+    uint32_t timestamp;
+    uint8_t data[meshtastic_Constants_DATA_PAYLOAD_LEN * 4]; // Allow up to 4 packets
+    size_t dataLen;
+    uint8_t codec2Mode;
+    uint8_t memoId;        // Memo ID from sender (to identify related packets)
+    uint8_t receivedParts; // Bitmask of received packet sequences
+    uint8_t expectedParts; // Total expected parts (0 = unknown)
+    bool played;
+};
+
+class VoiceMemoModule : public SinglePortModule, public Observable<const UIFrameEvent *>, private concurrency::OSThread
+{
+  public:
+    VoiceMemoModule();
+
+    /**
+     * Check if we should draw the UI frame
+     */
+    bool shouldDraw();
+
+    /**
+     * Handle keyboard input for Shift+Space detection
+     */
+    int handleInputEvent(const InputEvent *event);
+
+    /**
+     * Play a stored voice memo
+     */
+    void playStoredMemo(int index);
+
+    /**
+     * Get number of unplayed memos
+     */
+    int getUnplayedCount();
+
+    /**
+     * Get stored memo info for UI
+     */
+    const StoredVoiceMemo *getStoredMemo(int index);
+
+  protected:
+    virtual int32_t runOnce() override;
+    virtual meshtastic_MeshPacket *allocReply() override;
+    virtual bool wantUIFrame() override { return shouldDraw(); }
+    virtual Observable<const UIFrameEvent *> *getUIFrameObservable() override { return this; }
+
+#if HAS_SCREEN
+    virtual void drawFrame(OLEDDisplay *display, OLEDDisplayUiState *state, int16_t x, int16_t y) override;
+#endif
+
+    virtual ProcessMessage handleReceived(const meshtastic_MeshPacket &mp) override;
+
+  private:
+    // State machine
+    VoiceMemoState state = VoiceMemoState::IDLE;
+
+    // Codec2
+    CODEC2 *codec2 = nullptr;
+    int encodeCodecSize = 0;
+    int adcBufferSize = 0;
+
+    // Audio buffers
+    int16_t speechBuffer[VOICEMEMO_ADC_BUFFER_SIZE] = {};
+    int16_t outputBuffer[VOICEMEMO_ADC_BUFFER_SIZE] = {};
+    int16_t upsampleBuffer[VOICEMEMO_UPSAMPLE_BUFFER_SIZE] = {}; // For 8kHz->44.1kHz upsampling
+    uint8_t encodedFrame[meshtastic_Constants_DATA_PAYLOAD_LEN] = {};
+    size_t encodedFrameIndex = 0;
+
+    // Recording state
+    uint32_t recordingStartMs = 0;
+    uint32_t sendingCompleteMs = 0; // When sending completed (for "Sent!" display timeout)
+    uint8_t currentMemoId = 0;      // Unique ID for current recording session
+    uint8_t currentSequence = 0;    // Current packet sequence number
+
+    // I2S state
+    bool i2sInitialized = false;
+
+    // Stored memos for playback
+    StoredVoiceMemo storedMemos[VOICEMEMO_MAX_STORED];
+    int storedMemoCount = 0;
+
+    // Playback state
+    int playingMemoIndex = -1;
+    size_t playbackPosition = 0;
+
+    // Filter for audio cleanup
+    ButterworthFilter *hpFilter = nullptr;
+
+    // Codec2 task for encoding (needs large stack)
+    TaskHandle_t codec2TaskHandle = nullptr;
+    volatile bool codec2TaskRunning = false;
+    volatile bool audioReady = false;
+
+    // Playback task (also needs large stack for Codec2 decoding)
+    TaskHandle_t playbackTaskHandle = nullptr;
+    volatile bool playbackTaskRunning = false;
+    volatile bool playbackReady = false;
+    const StoredVoiceMemo *currentPlaybackMemo = nullptr;
+
+    // Internal methods
+    bool initES7210();
+    bool initI2S();
+    void deinitI2S();
+    void startRecording();
+    void stopRecording();
+    void processRecordingBuffer();
+    void sendEncodedPayload();
+    void storeMemo(const meshtastic_MeshPacket &mp);
+    void playMemo(const StoredVoiceMemo &memo);
+
+  public:
+    // Called by the codec2 task - needs to be public for task function access
+    void doCodec2Encode();
+    void doCodec2Playback();
+
+    // Keyboard observer
+    CallbackObserver<VoiceMemoModule, const InputEvent *> inputObserver =
+        CallbackObserver<VoiceMemoModule, const InputEvent *>(this, &VoiceMemoModule::handleInputEvent);
+};
+
+extern VoiceMemoModule *voiceMemoModule;
+
+#endif // ARCH_ESP32 && HAS_I2S && !MESHTASTIC_EXCLUDE_VOICEMEMO