add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

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# locally computed
sha256  1c9fc529b78de7d26e9e47cf182c9f8bf43838d8f62a9c1773540d57f5ebc522  pymad-0.6.tar.gz