我在 VSCode 里用 PlatformIO 创建了一个项目，board 是 esp32-c3-devkitm-1，框架是 Arduino。 请在 src/main.cpp 里写一个 Blink 程序，让板载 LED 以 500ms 间隔闪烁，并打印串口日志，波特率 115200。 这里的关键词是"项目来源 + board 型号 + 框架 + 具体行为 + 外设参数"。

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