add gpio

hc

2023-12-04 f33f61bdb7ca6d5ebe7a78f9d8694b91360279ac

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# Locally computed:
sha256    1c154fef91c65dbf1cd4519af7ade70a61d85a923b6e0c0b007dc7f4895cf7d8    cxxtest-4.4.tar.gz
 
# Hash for license file:
sha256 da7eabb7bafdf7d3ae5e9f223aa5bdc1eece45ac569dc21b3b037520b4464768  COPYING