sdk: add I2S config

sdk/boards/lilka_v2.json

@@ -13,7 +13,10 @@
       "-DARDUINO_USB_CDC_ON_BOOT=1",
       "-DARDUINO_RUNNING_CORE=1",
       "-DARDUINO_EVENT_RUNNING_CORE=1",
-      "-DBOARD_HAS_PSRAM"
+      "-DBOARD_HAS_PSRAM",
+      "-DPIN_I2S_SD=2",
+      "-DPIN_I2S_FS=1",
+      "-DPIN_I2S_SCK=42"
     ],
     "f_cpu": "240000000L",
     "f_flash": "80000000L",

sdk/lib/lilka/src/lilka.cpp

@@ -10,6 +10,7 @@ void begin() {
     multiboot.begin();
     spi_begin();
     buzzer.begin(); // Play notification sound
+    audio.begin();
     display.begin(); // Must be initialized BEFORE SD card
     sdcard.begin();
     controller.begin(); // Must be initialized AFTER SD card (since SD card somehow messes with GPIO)

sdk/lib/lilka/src/lilka.h

@@ -14,8 +14,7 @@
 #include "lilka/sys.h"
 #include "lilka/resources.h"
 #include "lilka/fmath.h"
-// #include "lua/luarunner.h"
-// #include "mjs/mjsrunner.h"
+#include "lilka/audio.h"
 
 namespace lilka {
 /// Ініціалізація Лілки

sdk/lib/lilka/src/lilka/audio.cpp

@@ -0,0 +1,39 @@
+#include "audio.h"
+#include "hi.h"
+
+namespace lilka {
+
+Audio::Audio() {
+}
+
+void hi_task(void* arg);
+
+void Audio::begin() {
+    I2S.begin(I2S_PHILIPS_MODE, 22050, 16);
+
+    // Signed 8-bit PCM
+    // for (int i = 0; i < hi_raw_size; i++) {
+    //     I2S.write(hi_raw[i]);
+    //     I2S.write(hi_raw[i]);
+    // }
+
+    xTaskCreatePinnedToCore(hi_task, "hi_task", 4096, NULL, 1, NULL, 0);
+}
+
+void hi_task(void* arg) {
+    // Signed 16-bit PCM
+    const int16_t* hi = reinterpret_cast<const int16_t*>(hi_raw);
+
+    for (int i = 0; i < hi_raw_size / 2; i++) {
+        I2S.write(hi[i]);
+        I2S.write(hi[i]);
+    }
+
+    vTaskDelete(NULL);
+}
+
+Audio audio;
+
+// I2SClass i2s(0, 0, LILKA_I2S_DOUT, LILKA_I2S_BCLK, LILKA_I2S_LRCK);
+
+} // namespace lilka

sdk/lib/lilka/src/lilka/audio.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <I2S.h>
+#include "lilka/config.h"
+
+namespace lilka {
+
+class Audio {
+public:
+    Audio();
+    void begin();
+};
+
+extern Audio audio;
+
+// extern I2SClass i2s;
+
+} // namespace lilka