WhyCan Forum(哇酷开发者社区)

终于找到原因了 https://www.silabs.com/community/interface/knowledge-base.entry.html/2018/07/24/how_to_control_gpios-Wot7

On Linux

The CP210x driver has been distributed as part of the Linux kernel since v2.6.12, and GPIO operations also be supported by Linux 4.10.0 kernel or later.

而我的 Linux 版本:

lilo@ubuntu:/opt$ uname -a
Linux ubuntu 4.2.0-42-generic #49~14.04.1-Ubuntu SMP Wed Jun 29 20:22:11 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux