From ffa2fc96d74ece11450e02cba7110ddc30d02244 Mon Sep 17 00:00:00 2001
From: Arti Zirk <arti.zirk@gmail.com>
Date: Sat, 2 Apr 2022 21:14:21 +0300
Subject: [PATCH] Init

---
 .gitignore |  2 ++
 LICENSE    | 21 ++++++++++++++
 README.md  | 14 +++++++++
 build.sh   |  3 ++
 go.mod     |  8 ++++++
 go.sum     |  4 +++
 godoor.go  | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 136 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 README.md
 create mode 100644 build.sh
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 godoor.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e55c5c7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.idea
+godoor
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..a6a32bb
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+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.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ac14faf
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+# 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:
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..879b55f
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+
+GOOS=linux GOARCH=arm64 go build && scp godoor rpi4b:
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..4cb4aff
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module godoor
+
+go 1.18
+
+require (
+	github.com/warthog618/gpiod v0.8.0 // indirect
+	golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..d8aee82
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+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=
diff --git a/godoor.go b/godoor.go
new file mode 100644
index 0000000..a92c544
--- /dev/null
+++ b/godoor.go
@@ -0,0 +1,84 @@
+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")
+}