add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from http://pypi.python.org/pypi?:action=show_md5&digest=e849af7f8b7ec75cbc7a53da67c51a51, sha256 locally computed
md5     e849af7f8b7ec75cbc7a53da67c51a51  pyserial-3.1.tar.gz
sha256  c8ffdcbd8bfd308842409e558848c32aa3499a1bfe95a591e4210072b9520f1e  pyserial-3.1.tar.gz