From be22e89f66d1485be527128842eeb922214716ea Mon Sep 17 00:00:00 2001
From: Arti Zirk <arti.zirk@gmail.com>
Date: Sun, 3 Apr 2022 16:50:21 +0300
Subject: [PATCH] Read many cards

---
 godoor.go | 58 ++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 18 deletions(-)

diff --git a/godoor.go b/godoor.go
index a92c544..093f538 100644
--- a/godoor.go
+++ b/godoor.go
@@ -6,16 +6,19 @@ import "github.com/warthog618/gpiod"
 
 const wiegand_a = 17
 const wiegand_b = 18
+const wiegand_bit_timeout = time.Millisecond * 8
 const solenoid = 21
 
 var bits [64]bool
 var card uint64 = 0
 var bitnr uint64 = 0
+var timeout *time.Timer
 
 func openDoor(l *gpiod.Line) {
 	fmt.Println("Open")
 	l.SetValue(1)
-	time.Sleep(500000000)
+	d, _ := time.ParseDuration("500ms")
+	time.Sleep(d)
 	l.SetValue(0)
 	fmt.Println("Close")
 }
@@ -28,20 +31,33 @@ func printCardId() {
 	fmt.Printf("\n")
 }
 
-func cardEvent() {
-	for i := 63; i != 0; i-- {
-		if bits[i] == true {
-			card |= 1 << (63 - i)
+func cardRunner() {
+	for {
+		// Wait for bit timeout
+		fmt.Printf("Waiting for bit timeout\n")
+		<-timeout.C
+		fmt.Printf("\n")
+
+		if bitnr != 64 {
+			fmt.Printf("We got less than 64 bits: %d\n", bitnr)
 		}
+
+		for i := 63; i != 0; i-- {
+			if bits[i] == true {
+				card |= 1 << (63 - i)
+			}
+		}
+
+		printCardId()
+
+		bitnr = 0
+		card = 0
 	}
-
-	printCardId()
-
-	bitnr = 0
-	card = 0
 }
 
 func wiegandEvent(evt gpiod.LineEvent) {
+	timeout.Reset(wiegand_bit_timeout)
+
 	if evt.Offset == wiegand_b {
 		bits[bitnr] = true
 		fmt.Printf("1")
@@ -49,16 +65,16 @@ func wiegandEvent(evt gpiod.LineEvent) {
 		bits[bitnr] = false
 		fmt.Printf("0")
 	}
+
 	bitnr += 1
-
-	if bitnr == 64 {
-		fmt.Printf("\n")
-		cardEvent()
-	}
-
 }
 
 func main() {
+	timeout = time.NewTimer(wiegand_bit_timeout)
+	if !timeout.Stop() {
+		<-timeout.C
+	}
+
 	wa, err := gpiod.RequestLine("gpiochip0", wiegand_a, gpiod.AsInput,
 		gpiod.WithFallingEdge, gpiod.WithEventHandler(wiegandEvent))
 	if err != nil {
@@ -75,9 +91,15 @@ func main() {
 		panic(err)
 	}
 
-	openDoor(solenoid_line)
+	//openDoor(solenoid_line)
+	_ = solenoid_line
+	go cardRunner()
+	fmt.Printf("Sleeping\n")
 
-	time.Sleep(time.Minute)
+	for {
+		time.Sleep(time.Second)
+		fmt.Printf(".")
+	}
 	wa.Close()
 	wb.Close()
 	fmt.Println("Done")