Init

.gitignore

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+.idea
+godoor

LICENSE

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+MIT License
+
+Copyright (c) 2022 Arti Zirk <arti.zirk@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# GoDoor
+
+[kdoorpi](https://git.k-space.ee/arti/kdoorpi) but in Go
+
+Uses Go native [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about/)
+library to access the gpio pins in cross platform way.
+
+# Cross compile
+
+    GOOS=linux GOARCH=arm64 go build
+
+# Test deploy
+
+    scp godoor rpi4b:

build.sh

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+#!/bin/bash
+
+GOOS=linux GOARCH=arm64 go build && scp godoor rpi4b:

go.mod

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+module godoor
+
+go 1.18
+
+require (
+	github.com/warthog618/gpiod v0.8.0 // indirect
+	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect
+)

go.sum

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+github.com/warthog618/gpiod v0.8.0 h1:qxH9XVvWHpTxzWFSndBcujFyNH5zVRzHM63tcmm85o4=
+github.com/warthog618/gpiod v0.8.0/go.mod h1:a7Csa+IJtDBZ39++zC/6Srjo01qWejt/5velrDWuNkY=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

godoor.go

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+package main
+
+import "fmt"
+import "time"
+import "github.com/warthog618/gpiod"
+
+const wiegand_a = 17
+const wiegand_b = 18
+const solenoid = 21
+
+var bits [64]bool
+var card uint64 = 0
+var bitnr uint64 = 0
+
+func openDoor(l *gpiod.Line) {
+	fmt.Println("Open")
+	l.SetValue(1)
+	time.Sleep(500000000)
+	l.SetValue(0)
+	fmt.Println("Close")
+}
+
+func printCardId() {
+	fmt.Printf("%d, ", bitnr)
+	for i := 0; i < 7; i++ {
+		fmt.Printf("%02x", (card>>(8*i))&0xff)
+	}
+	fmt.Printf("\n")
+}
+
+func cardEvent() {
+	for i := 63; i != 0; i-- {
+		if bits[i] == true {
+			card |= 1 << (63 - i)
+		}
+	}
+
+	printCardId()
+
+	bitnr = 0
+	card = 0
+}
+
+func wiegandEvent(evt gpiod.LineEvent) {
+	if evt.Offset == wiegand_b {
+		bits[bitnr] = true
+		fmt.Printf("1")
+	} else {
+		bits[bitnr] = false
+		fmt.Printf("0")
+	}
+	bitnr += 1
+
+	if bitnr == 64 {
+		fmt.Printf("\n")
+		cardEvent()
+	}
+
+}
+
+func main() {
+	wa, err := gpiod.RequestLine("gpiochip0", wiegand_a, gpiod.AsInput,
+		gpiod.WithFallingEdge, gpiod.WithEventHandler(wiegandEvent))
+	if err != nil {
+		panic(err)
+	}
+	wb, err := gpiod.RequestLine("gpiochip0", wiegand_b, gpiod.AsInput,
+		gpiod.WithFallingEdge, gpiod.WithEventHandler(wiegandEvent))
+	if err != nil {
+		panic(err)
+	}
+
+	solenoid_line, err := gpiod.RequestLine("gpiochip0", solenoid, gpiod.AsOutput(0))
+	if err != nil {
+		panic(err)
+	}
+
+	openDoor(solenoid_line)
+
+	time.Sleep(time.Minute)
+	wa.Close()
+	wb.Close()
+	fmt.Println("Done")
+}