Simplify startup and remove rx,tx channels

device.go

@@ -12,6 +12,9 @@ const (
 	spiPath = "/dev/spidev0.0"
 )
 
+// OnReceiveHandler is the receive callback
+type OnReceiveHandler func(*Data)
+
 // Device RFM69 Device
 type Device struct {
 	spiDevice  *spidev.SPIDevice
@@ -21,6 +24,9 @@ type Device struct {
 	network    byte
 	isRFM69HW  bool
 	powerLevel byte
+	tx         chan *Data
+	quit       chan bool
+	OnReceive  OnReceiveHandler
 }
 
 // Global settings
@@ -48,15 +54,24 @@ func NewDevice(nodeID, networkID byte, isRfm69HW bool) (*Device, error) {
 		address:    nodeID,
 		isRFM69HW:  isRfm69HW,
 		powerLevel: 31,
+		tx:         make(chan *Data),
+		quit:       make(chan bool),
 	}
 
 	err = ret.setup()
+	if err != nil {
+		return nil, err
+	}
+
+	go ret.loop()
 
-	return ret, err
+	return ret, nil
 }
 
 // Close cleans up
 func (r *Device) Close() error {
+	r.quit <- true
+	<-r.quit
 	err := r.gpio.Close()
 	if err != nil {
 		return err

loop.go

@@ -6,16 +6,12 @@ import (
 	"github.com/davecheney/gpio"
 )
 
-// Loop is the main receive and transmit handling loop
-func (r *Device) Loop() (rx chan *Data, tx chan *Data, quit chan bool) {
-	quit = make(chan bool)
-	rx = make(chan *Data, 5)
-	tx = make(chan *Data, 5)
-	go r.loopInternal(rx, tx, quit)
-	return
+// Send data
+func (r *Device) Send(d *Data) {
+	r.tx <- d
 }
 
-func (r *Device) loopInternal(rx chan *Data, tx chan *Data, quit chan bool) {
+func (r *Device) loop() {
 	irq := make(chan int)
 	r.gpio.BeginWatch(gpio.EdgeRising, func() {
 		irq <- 1
@@ -31,7 +27,7 @@ func (r *Device) loopInternal(rx chan *Data, tx chan *Data, quit chan bool) {
 
 	for {
 		select {
-		case dataToTransmit := <-tx:
+		case dataToTransmit := <-r.tx:
 			// TODO: can send?
 			r.readWriteReg(REG_PACKETCONFIG2, 0xFB, RF_PACKET2_RXRESTART) // avoid RX deadlocks
 			err = r.SetModeAndWait(RF_OPMODE_STANDBY)
@@ -81,13 +77,15 @@ func (r *Device) loopInternal(rx chan *Data, tx chan *Data, quit chan bool) {
 				log.Print(err)
 				return
 			}
-			rx <- &data
+			if r.OnReceive != nil {
+				go r.OnReceive(&data)
+			}
 			err = r.SetMode(RF_OPMODE_RECEIVER)
 			if err != nil {
 				log.Fatal(err)
 			}
-		case <-quit:
-			quit <- true
+		case <-r.quit:
+			r.quit <- true
 			return
 		}
 	}

payload/payload.go

@@ -1,20 +0,0 @@
-package payload
-
-// Payload is the first part
-type Payload struct {
-	Type   int16  // sensor type (2, 3, 4, 5)
-	Uptime uint32 // uptime in ms
-}
-
-// Payload1 is for DHT22-nodes
-type Payload1 struct {
-	Temperature float32 // Temp
-	Humidity    float32 // Humidity
-	VBat        float32 // V Battery
-}
-
-// Payload2 is for switches
-type Payload2 struct {
-	Pin   byte // Pin number
-	State byte // 1=On 0=Off
-}