did something

vendor/periph.io/x/host/v3/rpi/doc.go

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+// Copyright 2016 The Periph Authors. All rights reserved.
+// Use of this source code is governed under the Apache License, Version 2.0
+// that can be found in the LICENSE file.
+
+// Package rpi contains Raspberry Pi hardware logic. It is intrinsically
+// related to package bcm283x.
+//
+// Assumes Raspbian but does not directly depend on the distro being Raspbian.
+// Windows IoT is currently not supported.
+//
+// # Physical
+//
+// The physical pin out is based on http://www.raspberrypi.org information but
+// http://pinout.xyz/ has a nice interactive web page.
+package rpi