参考这个教程 https://www.bearpi.cn/core_board/bearpi/pico/h2821/software/%E5%88%9B%E5%BB%BA%E7%AC%AC%E4%B8%80%E4%B8%AAHello%20World%E7%9A%84%E5%B7%A5%E7%A8%8B.html