Initial Commit

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+.vscode/extensions.json
+include/README
+test/README
+lib/README

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-s3-devkitc-1]
+platform = espressif32
+board = esp32-s3-devkitc-1
+framework = arduino
+board_upload.flash_size = 4MB
+board_build.partitions = default.csv
+build_flags = 
+  -DARDUINO_USB_CDC_ON_BOOT=1
+  -DBOARD_HAS_PSRAM

src/main.cpp

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+#include <Arduino.h>
+
+int myFunction(int, int);
+
+void setup() {
+  int result = myFunction(2, 3);
+}
+
+void loop() {
+}
+
+int myFunction(int x, int y) {
+  return x + y;
+}