add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# md5 from https://pypi.python.org/pypi/crcmod/json, sha256 locally computed
md5    2d5b92117d958dcead94f9e17f54cd32  crcmod-1.7.tar.gz
sha256    dc7051a0db5f2bd48665a990d3ec1cc305a466a77358ca4492826f41f283601e  crcmod-1.7.tar.gz