Improved RTTTL processing with the ESP8266Audio library

platformio.ini

@@ -24,4 +24,6 @@ build_flags =
 	-DARDUINO_USB_CDC_ON_BOOT=1
 	-DDISABLE_ALL_LIBRARY_WARNINGS
 lib_deps =
+    ArduinoWebsockets
+	earlephilhower/ESP8266Audio
 lib_extra_dirs = lib

src/Speaker.h

@@ -2,6 +2,9 @@
 
 #include <Arduino.h>
 #include <driver/i2s.h>
+#include <AudioGeneratorRTTTL.h>
+#include <AudioOutputI2S.h>
+#include <AudioFileSourcePROGMEM.h>
 
 #include "pins.h"
 
@@ -9,31 +12,6 @@
 #define SAMPLE_RATE 44100
 
 
-const float NOTE_FREQS[] = {
-    261.63, 277.18, 293.66, 311.13, 329.63, 349.23, 369.99, 392.00, 415.30, 440.00, 466.16, 493.88, // C4 to B4
-    523.25, 554.37, 587.33, 622.25, 659.25, 698.46, 739.99, 783.99, 830.61, 880.00, 932.33, 987.77, // C5 to B5
-    1046.50, 1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1480.00, 1568.00, 1661.22, 1760.00, 1864.66, 1975.53, // C6 to B6
-    2093.00, 2217.46, 2349.32, 2489.02, 2637.02, 2793.83, 2960.00, 3136.00, 3322.44, 3520.00, 3729.31, 3951.07  // C7 to B7
-};
-
-
-float getNoteFrequency(char note, int octave) {
-    if (note == 'p') return 0;  // Pause
-    int noteIndex = 0;
-    switch (note) {
-        case 'c': noteIndex = 0; break;
-        case 'd': noteIndex = 2; break;
-        case 'e': noteIndex = 4; break;
-        case 'f': noteIndex = 5; break;
-        case 'g': noteIndex = 7; break;
-        case 'a': noteIndex = 9; break;
-        case 'b': noteIndex = 11; break;
-        default: return 0;
-    }
-    return NOTE_FREQS[noteIndex + ((octave - 4) * 12)];
-}
-
-
 void setupI2S() {
     i2s_config_t i2s_config = {
         .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
@@ -41,7 +19,7 @@ void setupI2S() {
         .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
         .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
         .communication_format = I2S_COMM_FORMAT_STAND_I2S,
-        .intr_alloc_flags = 0,  // Default interrupt priority
+        .intr_alloc_flags = 0,
         .dma_buf_count = 8,
         .dma_buf_len = 64,
         .use_apll = false,
@@ -61,9 +39,8 @@ void setupI2S() {
     i2s_set_clk(BOARD_I2S_PORT, SAMPLE_RATE, I2S_BITS_PER_SAMPLE_16BIT, I2S_CHANNEL_MONO);
 }
 
-
 void playTone(float frequency, int duration, int volume = 16383) {
-    volume = constrain(volume, 0, 32767); // Max volume is 32767, we default to half volume if not specified
+    volume = constrain(volume, 0, 32767);
     const int wave_period = SAMPLE_RATE / frequency;
     int16_t sample_buffer[wave_period];
 
@@ -80,81 +57,24 @@ void playTone(float frequency, int duration, int volume = 16383) {
     }
 }
 
+void playRTTTL(const char* rtttl) {
+    static AudioGeneratorRTTTL *rtttlGenerator = new AudioGeneratorRTTTL();
+    static AudioOutputI2S *audioOutput = new AudioOutputI2S();
+    static AudioFileSourcePROGMEM *fileSource = new AudioFileSourcePROGMEM(rtttl, strlen(rtttl));
 
-void playRTTTL(const char* rtttl, int volume = 16383, int bpm = -1) {
+    audioOutput->begin();
-    int default_duration = 4;
+    rtttlGenerator->begin(fileSource, audioOutput);
-    int default_octave = 6;
+    while (rtttlGenerator->isRunning()) {
-    int internal_bpm = 63;
+        rtttlGenerator->loop();
-
-    const char* p = rtttl;
-
-    // Skip name
-    while (*p && *p != ':') p++;
-    if (*p == ':') p++;
-
-    while (*p && *p != ':') {
-        char param = *p++;
-        if (*p == '=') p++;
-        int value = atoi(p);
-        while (*p && isdigit(*p)) p++;
-        if (*p == ',') p++;
-        switch (param) {
-            case 'd': default_duration = value; break;
-            case 'o': default_octave = value; break;
-            case 'b': internal_bpm = value; break;
-        }
-    }
-
-    if (*p == ':') p++;
-
-    if (bpm != -1)
-        internal_bpm = bpm;
-
-    int beat_duration = 60000 / internal_bpm;
-
-    while (*p) {
-        int duration = 0;
-        if (isdigit(*p)) {
-            duration = atoi(p);
-            while (isdigit(*p)) p++;
-        } else {
-            duration = default_duration;
-        }
-
-        char note = *p++;
-        int frequency = getNoteFrequency(note, default_octave);
-
-        if (*p == '#') {
-            frequency = getNoteFrequency(note + 1, default_octave);
-            p++;
-        }
-
-        int octave = default_octave;
-
-        if (isdigit(*p))
-            octave = *p++ - '0';
-
-        if (*p == '.') {
-            duration = duration * 1.5;
-            p++;
-        }
-
-        int note_duration = (beat_duration * 4) / duration;
-
-        if (frequency > 0)
-            playTone(frequency, note_duration, volume);
-        else
-            delay(note_duration);
-
-        if (*p == ',') p++;
     }
+    rtttlGenerator->stop();
+    fileSource->close();
 }
 
-
 void playNotificationSound() {
     playTone(1000, 200);
     delay(100);
     playTone(1500, 200);
     delay(100);
     playTone(2000, 200);
-}
+}

src/main.ino

@@ -113,7 +113,6 @@ void displayXBM() {
 void setup() {
     // Initialize serial communication
     Serial.begin(115200);
-    while (!Serial);
     Serial.println("Booting device...");
 
     // Turn on the power to the board
@@ -141,7 +140,8 @@ void setup() {
 
     // Initialize the speaker
     setupI2S(); // Do we want to keep this open or uninstall after each use to keep resources free?
-    const char* rtttl_boot = "ff6_victory:d=4,o=5,b=100:32d6,32p,32d6,32p,32d6,32p,d6,a#,c6,16d6,8p,16c6,2d6"; // This will go in preferences soon
+    //const char* rtttl_boot = "ff6_victory:d=4,o=5,b=120:32d6,32p,32d6,32p,32d6,32p,d6,a#,c6,16d6,8p,16c6,2d6"; // This will go in preferences soon
+    const char* rtttl_boot = "TakeOnMe:d=4,o=4,b=375:8f#5,8f#5,8f#5,8d5,8p,8b,8p,8e5,8p,8e5,8p,8e5,8g#5,8g#5,8a5,8b5";
     playRTTTL(rtttl_boot);
 
     // Setup the WiFi
@@ -1204,6 +1204,8 @@ void parseAndDisplay(String line) {
             addLine("ERROR", "ERR_ERRONEUSNICKNAME", "error", TFT_RED, TFT_DARKGREY);
         } else if (command == "433") { // ERR_NICKNAMEINUSE
             addLine("ERROR", "ERR_NICKNAMEINUSE", "error", TFT_RED, TFT_DARKGREY);
+            irc_nickname = "ACID_" + String(random(1000, 9999)); // Generate a random nickname
+            sendIRC("NICK " + irc_nickname);                     // Attempt to change to the random nickname
         }
     }
 }