examples: correct missing const for lora atcmd

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/lora/atcmd/README.md

@@ -0,0 +1,29 @@
+# AT-CMD implementation of at-lora command set
+
+```
+$ tinygo monitor
+Connected to /dev/ttyACM0. Press Ctrl-C to exit.
++AT: OK
++VER: 0.0.1 (sx127x v18)
+```
+
+# Building
+
+## Simulator
+
+```
+tinygo flash -target pico ./examples/lora/atcmd/
+```
+
+## PyBadge with LoRa Featherwing 
+
+```
+tinygo flash -target pybadge -tags featherwing ./examples/lora/atcmd/
+```
+
+## LoRa-E5 
+
+```
+tinygo flash -target lorae5 ./examples/lora/atcmd/
+```
+

examples/lora/atcmd/commands.go

@@ -0,0 +1,410 @@
+package main
+
+import (
+	"encoding/hex"
+	"strings"
+)
+
+// Use to test if connection to module is OK.
+func quicktest() {
+	writeCommandOutput("AT", "OK")
+}
+
+// Check firmware version.
+func version() {
+	writeCommandOutput("VER", currentVersion()+" ("+firmwareVersion()+")")
+}
+
+// Use to check the ID of the LoRaWAN module, or change the ID.
+func id(args string) error {
+	cmd := "ID"
+
+	// look for comma in args
+	param, val, hasComma := strings.Cut(args, ",")
+	if hasComma {
+		// set
+		switch param {
+		case "DevAddr":
+			writeCommandOutput(cmd, "DevAddr, "+val)
+		case "DevEui":
+			writeCommandOutput(cmd, "DevEui, "+val)
+		case "AppEui":
+			writeCommandOutput(cmd, "AppEui, "+val)
+		default:
+			return errInvalidCommand
+		}
+
+		return nil
+	}
+
+	// get
+	switch param {
+	case "DevAddr":
+		writeCommandOutput(cmd, "DevAddr, xx:xx:xx:xx")
+	case "DevEui":
+		writeCommandOutput(cmd, "DevEui, xx:xx:xx:xx:xx:xx:xx:xx")
+	case "AppEui":
+		writeCommandOutput(cmd, "AppEui, xx:xx:xx:xx:xx:xx:xx:xx")
+	default:
+		writeCommandOutput(cmd, "DevAddr, xx:xx:xx:xx")
+		writeCommandOutput(cmd, "DevEui, xx:xx:xx:xx:xx:xx:xx:xx")
+		writeCommandOutput(cmd, "AppEui, xx:xx:xx:xx:xx:xx:xx:xx")
+	}
+
+	return nil
+}
+
+// Use to reset the module. If module returns error, then reset function is invalid.
+func reset() error {
+	radio.Reset()
+
+	writeCommandOutput("RESET", "OK")
+	return nil
+}
+
+// Use to send string format frame which is no need to be confirmed by the server.
+func msg(data string) error {
+	cmd := "MSG"
+	writeCommandOutput(cmd, "Start")
+
+	if err := radio.Tx([]byte(data), defaultTimeout); err != nil {
+		writeCommandOutput(cmd, err.Error())
+
+		return err
+	}
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+// Use to send string format frame which must be confirmed by the server
+func cmsg(data string) error {
+	cmd := "CMSG"
+	writeCommandOutput(cmd, "Start")
+
+	if err := radio.Tx([]byte(data), defaultTimeout); err != nil {
+		writeCommandOutput(cmd, err.Error())
+
+		return err
+	}
+
+	// TODO: confirmation
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+// Use to send hex format frame which is no need to be confirmed by the server
+func msghex(data string) error {
+	cmd := "MSGHEX"
+	writeCommandOutput(cmd, "Start")
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+// Use to send hex format frame which must be confirmed by the server.
+func cmsghex(data string) error {
+	cmd := "CMSGHEX"
+	writeCommandOutput(cmd, "Start")
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+// Use to send string format LoRaWAN proprietary frames
+func pmsg(data string) error {
+	cmd := "PMSG"
+	writeCommandOutput(cmd, "Start")
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+// Use to send hex format LoRaWAN proprietary frames.
+func pmsghex(data string) error {
+	cmd := "PMSGHEX"
+	writeCommandOutput(cmd, "Start")
+
+	writeCommandOutput(cmd, "Done")
+
+	return nil
+}
+
+// Set PORT number which will be used by MSG/CMSG/MSGHEX/CMSGHEX command to send
+// message, port number should range from 1 to 255. User should refer to LoRaWAN
+// specification to choose port.
+func port(p string) error {
+	cmd := "PMSG"
+	writeCommandOutput(cmd, p)
+
+	return nil
+}
+
+// Set ADR function of LoRaWAN module
+func adr(state string) error {
+	cmd := "ADR"
+	writeCommandOutput(cmd, state)
+
+	return nil
+}
+
+// Use LoRaWAN defined DRx to set datarate of LoRaWAN AT modem.
+func dr(rate string) error {
+	cmd := "DR"
+	writeCommandOutput(cmd, rate)
+
+	return nil
+}
+
+// Channel Configuration
+func ch(channel string) error {
+	cmd := "CH"
+	writeCommandOutput(cmd, channel)
+
+	return nil
+}
+
+// Set and Check Power
+func power(setting string) error {
+	cmd := "POWER"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+// Unconfirmed message repeats times.
+func rept(setting string) error {
+	cmd := "REPT"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+// Confirmed message retry times. Valid range 0~254,
+// if retry times is less than 2, only one message will
+// be sent. Random delay 3 - 10s between each retry
+// (band duty cycle limitation has the priority)
+func retry(setting string) error {
+	cmd := "RETRY"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func rxwin2(setting string) error {
+	cmd := "RXWIN2"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func rxwin1(setting string) error {
+	cmd := "RXWIN1"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func key(setting string) error {
+	cmd := "KEY"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func fdefault(setting string) error {
+	cmd := "FDEFAULT"
+	writeCommandOutput(cmd, "OK")
+
+	return nil
+}
+
+func mode(setting string) error {
+	cmd := "MODE"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func join(setting string) error {
+	cmd := "JOIN"
+	writeCommandOutput(cmd, "Starting")
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+func beacon(setting string) error {
+	cmd := "BEACON"
+	writeCommandOutput(cmd, "Starting")
+
+	writeCommandOutput(cmd, "Done")
+
+	return nil
+}
+
+func class(setting string) error {
+	cmd := "CLASS"
+	writeCommandOutput(cmd, "Starting")
+
+	writeCommandOutput(cmd, "Done")
+
+	return nil
+}
+
+func delay(setting string) error {
+	cmd := "DELAY"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func lw(setting string) error {
+	cmd := "LW"
+	writeCommandOutput(cmd, setting)
+
+	return nil
+}
+
+func wdt(setting string) error {
+	cmd := "WDT"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func lowpower(setting string) error {
+	cmd := "LOWPOWER"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func vdd(setting string) error {
+	cmd := "VDD"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func temp(setting string) error {
+	cmd := "TEMP"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func rtc(setting string) error {
+	cmd := "RTC"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func eeprom(setting string) error {
+	cmd := "EEPROM"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func uartcmd(setting string) error {
+	cmd := "UART"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func test(setting string) error {
+	cmd := "TEST"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func log(setting string) error {
+	cmd := "LOG"
+	writeCommandOutput(cmd, "Not implemented")
+
+	return nil
+}
+
+func send(data string) error {
+	cmd := "SEND"
+	writeCommandOutput(cmd, "Start")
+
+	// remove leading/trailing quotes
+	data = strings.Trim(data, "\"'")
+
+	if err := radio.Tx([]byte(data), defaultTimeout); err != nil {
+		writeCommandOutput(cmd, err.Error())
+
+		return err
+	}
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+func sendhex(data string) error {
+	cmd := "SENDHEX"
+	writeCommandOutput(cmd, "Start")
+
+	// remove leading/trailing quotes
+	data = strings.Trim(data, "\"'")
+
+	// convert data from hex formatted string
+	data = strings.ReplaceAll(data, " ", "")
+	payload, err := hex.DecodeString(data)
+	if err != nil {
+		writeCommandOutput(cmd, err.Error())
+
+		return err
+	}
+
+	if err := radio.Tx(payload, defaultTimeout); err != nil {
+		writeCommandOutput(cmd, err.Error())
+
+		return err
+	}
+
+	writeCommandOutput(cmd, "Done")
+	return nil
+}
+
+func recv(setting string) error {
+	cmd := "RECV"
+
+	data, err := lorarx()
+	if err != nil {
+		writeCommandOutput(cmd, "ERROR "+err.Error())
+		return err
+	}
+	writeCommandOutput(cmd, string(data))
+
+	return nil
+}
+
+func recvhex(setting string) error {
+	cmd := "RECVHEX"
+
+	data, err := lorarx()
+	if err != nil {
+		writeCommandOutput(cmd, "ERROR "+err.Error())
+		return err
+	}
+	writeCommandOutput(cmd, string(data))
+
+	return nil
+}
+
+func crlf() {
+	uart.Write([]byte("\r\n"))
+}
+
+func writeCommandOutput(cmd, data string) {
+	uart.Write([]byte("+" + cmd + ": "))
+	uart.Write([]byte(data))
+	crlf()
+}

examples/lora/atcmd/main.go

@@ -0,0 +1,65 @@
+// AT command set console running on the device UART to communicate with
+// an attached LoRa device.
+//
+// Computer <-> UART <-> MCU <-> SPI <-> SX126x/SX127x
+//
+// Connect using default baudrate for this hardware, 8-N-1 with your terminal program.
+// For details on the AT command set, see:
+// https://files.seeedstudio.com/products/317990687/res/LoRa-E5%20AT%20Command%20Specification_V1.0%20.pdf
+package main
+
+import (
+	"machine"
+	"time"
+)
+
+// change these to test a different UART or pins if available
+var (
+	uart  = machine.Serial
+	tx    = machine.UART_TX_PIN
+	rx    = machine.UART_RX_PIN
+	input = make([]byte, 0, 64)
+
+	radio          LoraRadio
+	defaultTimeout uint32 = 1000
+)
+
+func main() {
+	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
+
+	var err error
+	radio, err = setupLora()
+	if err != nil {
+		fail(err.Error())
+	}
+
+	for {
+		if uart.Buffered() > 0 {
+			data, _ := uart.ReadByte()
+
+			switch data {
+			case 13:
+				// return key
+				if err := parse(input); err != nil {
+					uart.Write([]byte("ERROR: "))
+					uart.Write([]byte(err.Error()))
+					crlf()
+				}
+				input = input[:0]
+			default:
+				// just capture the character
+				input = append(input, data)
+			}
+		}
+		time.Sleep(10 * time.Millisecond)
+	}
+}
+
+func fail(msg string) {
+	for {
+		uart.Write([]byte(msg))
+		crlf()
+
+		time.Sleep(time.Minute)
+	}
+}

examples/lora/atcmd/parser.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"errors"
+	"strings"
+)
+
+var (
+	errInvalidCommand = errors.New("Invalid command")
+)
+
+func parse(data []byte) error {
+	switch {
+	case len(data) < 2, string(data[0:2]) != "AT":
+		return errInvalidCommand
+	case len(data) == 2:
+		// just the AT command by itself
+		quicktest()
+	case len(data) < 6 || data[2] != '+':
+		return errInvalidCommand
+	default:
+		// parse the rest of the command
+		cmd, args, _ := strings.Cut(string(data[3:]), "=")
+		return parseCommand(cmd, args)
+	}
+
+	return nil
+}
+
+func parseCommand(cmd, args string) error {
+	switch cmd {
+	case "VER":
+		version()
+	case "ID":
+		id(args)
+	case "RESET":
+		reset()
+	case "MSG":
+		msg(args)
+	case "CMSG":
+		cmsg(args)
+	case "MSGHEX":
+		msghex(args)
+	case "CMSGHEX":
+		cmsghex(args)
+	case "PMSG":
+		pmsg(args)
+	case "PMSGHEX":
+		pmsg(args)
+	case "PORT":
+		port(args)
+	case "ADR":
+		adr(args)
+	case "DR":
+		dr(args)
+	case "CH":
+		ch(args)
+	case "POWER":
+		power(args)
+	case "REPT":
+		rept(args)
+	case "RETRY":
+		retry(args)
+	case "RXWIN2":
+		rxwin2(args)
+	case "RXWIN1":
+		rxwin1(args)
+	case "KEY":
+		key(args)
+	case "FDEFAULT":
+		fdefault(args)
+	case "MODE":
+		mode(args)
+	case "JOIN":
+		join(args)
+	case "BEACON":
+		join(args)
+	case "CLASS":
+		class(args)
+	case "DELAY":
+		delay(args)
+	case "LW":
+		lw(args)
+	case "WDT":
+		wdt(args)
+	case "LOWPOWER":
+		lowpower(args)
+	case "VDD":
+		vdd(args)
+	case "TEMP":
+		temp(args)
+	case "RTC":
+		rtc(args)
+	case "EEPROM":
+		eeprom(args)
+	case "UART":
+		uartcmd(args)
+	case "TEST":
+		test(args)
+	case "LOG":
+		log(args)
+	case "RECV":
+		recv(args)
+	case "RECVHEX":
+		recvhex(args)
+	case "SEND":
+		send(args)
+	case "SENDHEX":
+		sendhex(args)
+	default:
+		return errInvalidCommand
+	}
+
+	return nil
+}

examples/lora/atcmd/radio.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"errors"
+)
+
+var (
+	errRadioNotFound = errors.New("radio not found")
+	errRxTimeout     = errors.New("radio RX timeout")
+)
+
+type LoraRadio interface {
+	Reset()
+	Tx(pkt []uint8, timeoutMs uint32) error
+	Rx(timeoutMs uint32) ([]uint8, error)
+	SetFrequency(freq uint32)
+	SetIqMode(mode uint8)
+	SetCodingRate(cr uint8)
+	SetBandwidth(bw uint8)
+	SetCrc(enable bool)
+	SetSpreadingFactor(sf uint8)
+}

examples/lora/atcmd/sim.go

@@ -0,0 +1,37 @@
+//go:build !featherwing && !gnse && !lorae5 && !nucleowl55jc
+
+package main
+
+// do simulator setup here
+func setupLora() (LoraRadio, error) {
+	return &SimLoraRadio{}, nil
+}
+
+type SimLoraRadio struct {
+}
+
+func (sr *SimLoraRadio) Reset() {
+}
+
+func (sr *SimLoraRadio) Tx(pkt []uint8, timeoutMs uint32) error {
+	return nil
+}
+
+func (sr *SimLoraRadio) Rx(timeoutMs uint32) ([]uint8, error) {
+	return nil, nil
+}
+
+func (sr *SimLoraRadio) SetFrequency(freq uint32)    {}
+func (sr *SimLoraRadio) SetIqMode(mode uint8)        {}
+func (sr *SimLoraRadio) SetCodingRate(cr uint8)      {}
+func (sr *SimLoraRadio) SetBandwidth(bw uint8)       {}
+func (sr *SimLoraRadio) SetCrc(enable bool)          {}
+func (sr *SimLoraRadio) SetSpreadingFactor(sf uint8) {}
+
+func firmwareVersion() string {
+	return "simulator " + currentVersion()
+}
+
+func lorarx() ([]byte, error) {
+	return nil, nil
+}

examples/lora/atcmd/sx126x.go

@@ -0,0 +1,73 @@
+//go:build gnse || lorae5 || nucleowl55jc
+
+package main
+
+import (
+	"device/stm32"
+	"machine"
+	"runtime/interrupt"
+
+	rfswitch "tinygo.org/x/drivers/examples/sx126x/rfswitch"
+
+	"tinygo.org/x/drivers/lora"
+	"tinygo.org/x/drivers/sx126x"
+)
+
+const (
+	FREQ                      = 868100000
+	LORA_DEFAULT_RXTIMEOUT_MS = 1000
+	LORA_DEFAULT_TXTIMEOUT_MS = 5000
+)
+
+var (
+	loraRadio *sx126x.Device
+)
+
+// do sx126x setup here
+func setupLora() (LoraRadio, error) {
+	loraRadio = sx126x.New(machine.SPI3)
+	loraRadio.SetDeviceType(sx126x.DEVICE_TYPE_SX1262)
+
+	// Create RF Switch
+	var radioSwitch rfswitch.CustomSwitch
+	loraRadio.SetRfSwitch(radioSwitch)
+
+	if state := loraRadio.DetectDevice(); !state {
+		return nil, errRadioNotFound
+	}
+
+	// Add interrupt handler for Radio IRQs
+	intr := interrupt.New(stm32.IRQ_Radio_IRQ_Busy, radioIntHandler)
+	intr.Enable()
+
+	loraConf := lora.Config{
+		Freq:           FREQ,
+		Bw:             lora.Bandwidth_500_0,
+		Sf:             lora.SpreadingFactor9,
+		Cr:             lora.CodingRate4_7,
+		HeaderType:     lora.HeaderExplicit,
+		Preamble:       12,
+		Ldr:            lora.LowDataRateOptimizeOff,
+		Iq:             lora.IQStandard,
+		Crc:            lora.CRCOn,
+		SyncWord:       lora.SyncPrivate,
+		LoraTxPowerDBm: 20,
+	}
+
+	loraRadio.LoraConfig(loraConf)
+
+	return loraRadio, nil
+}
+
+// radioIntHandler will take care of radio interrupts
+func radioIntHandler(intr interrupt.Interrupt) {
+	loraRadio.HandleInterrupt()
+}
+
+func firmwareVersion() string {
+	return "sx126x"
+}
+
+func lorarx() ([]byte, error) {
+	return loraRadio.Rx(LORA_DEFAULT_RXTIMEOUT_MS)
+}

examples/lora/atcmd/sx127x.go

@@ -0,0 +1,85 @@
+//go:build featherwing
+
+package main
+
+import (
+	"strconv"
+
+	"machine"
+
+	"tinygo.org/x/drivers/lora"
+	"tinygo.org/x/drivers/sx127x"
+)
+
+const (
+	FREQ                      = 868100000
+	LORA_DEFAULT_RXTIMEOUT_MS = 1000
+	LORA_DEFAULT_TXTIMEOUT_MS = 5000
+)
+
+var (
+	// We assume LoRa Featherwing module is connected to PyBadge:
+	rstPin    = machine.D11
+	csPin     = machine.D10
+	dio0Pin   = machine.D6
+	dio1Pin   = machine.D9
+	spi       = machine.SPI0
+	loraRadio *sx127x.Device
+)
+
+// do sx127x setup here
+func setupLora() (LoraRadio, error) {
+	rstPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	csPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	dio0Pin.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	dio1Pin.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	spi.Configure(machine.SPIConfig{Frequency: 500000, Mode: 0})
+
+	loraRadio = sx127x.New(spi, csPin, rstPin)
+	loraRadio.Reset()
+
+	if state := loraRadio.DetectDevice(); !state {
+		return nil, errRadioNotFound
+	}
+
+	// Setup DIO0 interrupt Handling
+	if err := dio0Pin.SetInterrupt(machine.PinRising, dioIrqHandler); err != nil {
+		println("could not configure DIO0 pin interrupt:", err.Error())
+	}
+
+	// Setup DIO1 interrupt Handling
+	if err := dio1Pin.SetInterrupt(machine.PinRising, dioIrqHandler); err != nil {
+		println("could not configure DIO1 pin interrupt:", err.Error())
+	}
+
+	// Prepare for Lora Operation
+	loraConf := lora.Config{
+		Freq:           FREQ,
+		Bw:             lora.Bandwidth_500_0,
+		Sf:             lora.SpreadingFactor9,
+		Cr:             lora.CodingRate4_7,
+		HeaderType:     lora.HeaderExplicit,
+		Preamble:       12,
+		Iq:             lora.IQStandard,
+		Crc:            lora.CRCOn,
+		SyncWord:       lora.SyncPrivate,
+		LoraTxPowerDBm: 20,
+	}
+
+	loraRadio.LoraConfig(loraConf)
+
+	return loraRadio, nil
+}
+
+func dioIrqHandler(machine.Pin) {
+	loraRadio.HandleInterrupt()
+}
+
+func firmwareVersion() string {
+	v := loraRadio.GetVersion()
+	return "sx127x v" + strconv.Itoa(int(v))
+}
+
+func lorarx() ([]byte, error) {
+	return loraRadio.Rx(LORA_DEFAULT_RXTIMEOUT_MS)
+}

examples/lora/atcmd/version.go

@@ -0,0 +1,7 @@
+package main
+
+const VERSION = "0.0.1"
+
+func currentVersion() string {
+	return VERSION
+}

examples/lora/atcmd/wl55jc.go

@@ -0,0 +1,54 @@
+//go:build nucleowl55jc
+
+/*
+	Nucleo WL55JC1
+	RFSwitch
+
++-----------+---------+------------+------------+
+|           | FE_CTRL1 |  FE_CTRL2 |   FE_CTRL3 |
+|           |   (PC4)  |   (PC5)   |     (PC3)  |
++-----------+----------+-----------+------------+
+|  TX_HP    |   LOW    |   HIGH    |    HIGH    |
+|  TX_LP    |   HIGH   |   HIGH    |    HIGH    |
+|  RX       |   HIGH   |   LOW     |    HIGH    |
++-----------+----------+-----------+------------+
+*/
+package main
+
+import (
+	"machine"
+
+	"tinygo.org/x/drivers/sx126x"
+)
+
+type CustomSwitch struct {
+}
+
+func (s CustomSwitch) InitRFSwitch() {
+	machine.PC4.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.PC5.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.PC3.Configure(machine.PinConfig{Mode: machine.PinOutput})
+}
+
+func (s CustomSwitch) SetRfSwitchMode(mode int) error {
+	switch mode {
+
+	case sx126x.RFSWITCH_TX_HP:
+		machine.PC4.Set(false)
+		machine.PC5.Set(true)
+		machine.PC3.Set(true)
+
+	case sx126x.RFSWITCH_TX_LP:
+		machine.PC4.Set(true)
+		machine.PC5.Set(true)
+		machine.PC3.Set(true)
+
+	case sx126x.RFSWITCH_RX:
+		machine.PC4.Set(true)
+		machine.PC5.Set(false)
+		machine.PC3.Set(true)
+
+	}
+	return nil
+
+}

examples/sx126x/lora_continuous/lora_continuous.go

@@ -7,6 +7,7 @@ import (
 
 	rfswitch "tinygo.org/x/drivers/examples/sx126x/rfswitch"
 
+	"tinygo.org/x/drivers/lora"
 	"tinygo.org/x/drivers/sx126x"
 )
 
@@ -36,17 +37,17 @@ func main() {
 	}
 
 	// Prepare for Lora operation
-	loraConf := sx126x.LoraConfig{
+	loraConf := lora.Config{
 		Freq:           FREQ,
-		Bw:             sx126x.SX126X_LORA_BW_500_0,
+		Bw:             lora.Bandwidth_500_0,
-		Sf:             sx126x.SX126X_LORA_SF9,
+		Sf:             lora.SpreadingFactor9,
-		Cr:             sx126x.SX126X_LORA_CR_4_7,
+		Cr:             lora.CodingRate4_7,
-		HeaderType:     sx126x.SX126X_LORA_HEADER_EXPLICIT,
+		HeaderType:     lora.HeaderExplicit,
 		Preamble:       12,
-		Ldr:            sx126x.SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_OFF,
+		Ldr:            lora.LowDataRateOptimizeOff,
-		Iq:             sx126x.SX126X_LORA_IQ_STANDARD,
+		Iq:             lora.IQStandard,
-		Crc:            sx126x.SX126X_LORA_CRC_ON,
+		Crc:            lora.CRCOn,
-		SyncWord:       sx126x.SX126X_LORA_MAC_PRIVATE_SYNCWORD,
+		SyncWord:       lora.SyncPrivate,
 		LoraTxPowerDBm: 14,
 	}
 	loraRadio.LoraConfig(loraConf)

examples/sx126x/lora_rxtx/lora_rxtx.go

@@ -11,6 +11,7 @@ import (
 
 	rfswitch "tinygo.org/x/drivers/examples/sx126x/rfswitch"
 
+	"tinygo.org/x/drivers/lora"
 	"tinygo.org/x/drivers/sx126x"
 )
 
@@ -54,17 +55,17 @@ func main() {
 	intr := interrupt.New(stm32.IRQ_Radio_IRQ_Busy, radioIntHandler)
 	intr.Enable()
 
-	loraConf := sx126x.LoraConfig{
+	loraConf := lora.Config{
 		Freq:           FREQ,
-		Bw:             sx126x.SX126X_LORA_BW_500_0,
+		Bw:             lora.Bandwidth_500_0,
-		Sf:             sx126x.SX126X_LORA_SF9,
+		Sf:             lora.SpreadingFactor9,
-		Cr:             sx126x.SX126X_LORA_CR_4_7,
+		Cr:             lora.CodingRate4_7,
-		HeaderType:     sx126x.SX126X_LORA_HEADER_EXPLICIT,
+		HeaderType:     lora.HeaderExplicit,
 		Preamble:       12,
-		Ldr:            sx126x.SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_OFF,
+		Ldr:            lora.LowDataRateOptimizeOff,
-		Iq:             sx126x.SX126X_LORA_IQ_STANDARD,
+		Iq:             lora.IQStandard,
-		Crc:            sx126x.SX126X_LORA_CRC_ON,
+		Crc:            lora.CRCOn,
-		SyncWord:       sx126x.SX126X_LORA_MAC_PRIVATE_SYNCWORD,
+		SyncWord:       lora.SyncPrivate,
 		LoraTxPowerDBm: 20,
 	}
 
@@ -74,21 +75,18 @@ func main() {
 	for {
 		tStart := time.Now()
 
-		// Blocking RX for LORA_DEFAULT_RXTIMEOUT_MS
+		println("main: Receiving Lora for 10 seconds")
-		println("Start Lora RX for 10 sec")
 		for int(time.Now().Sub(tStart).Seconds()) < 10 {
-			buf, err := loraRadio.LoraRx(LORA_DEFAULT_RXTIMEOUT_MS)
+			buf, err := loraRadio.Rx(LORA_DEFAULT_RXTIMEOUT_MS)
-
 			if err != nil {
 				println("RX Error: ", err)
 			} else if buf != nil {
 				println("Packet Received: len=", len(buf), string(buf))
 			}
 		}
-		println("END Lora RX")
+		println("main: End Lora RX")
-
+		println("LORA TX size=", len(txmsg), " -> ", string(txmsg))
-		println("LORA TX size=", len(txmsg))
+		err := loraRadio.Tx(txmsg, LORA_DEFAULT_TXTIMEOUT_MS)
-		err := loraRadio.LoraTx(txmsg, LORA_DEFAULT_TXTIMEOUT_MS)
 		if err != nil {
 			println("TX Error:", err)
 		}

examples/sx127x/lora_rxtx/lora_rxtx.go

@@ -0,0 +1,106 @@
+package main
+
+// This example code demonstrates Lora RX/TX With SX127x driver
+// You need to connect SPI, RST, CS, DIO0 (aka IRQ) and DIO1 to use.
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/lora"
+	"tinygo.org/x/drivers/sx127x"
+)
+
+const FREQ = 868100000
+
+const (
+	LORA_DEFAULT_RXTIMEOUT_MS = 1000
+	LORA_DEFAULT_TXTIMEOUT_MS = 5000
+)
+
+var (
+	loraRadio *sx127x.Device
+	txmsg     = []byte("Hello TinyGO")
+
+	// We assume LoRa Featherwing module is connected to PyBadge:
+	SX127X_PIN_RST  = machine.D11
+	SX127X_PIN_CS   = machine.D10
+	SX127X_PIN_DIO0 = machine.D6
+	SX127X_PIN_DIO1 = machine.D9
+	SX127X_SPI      = machine.SPI0
+)
+
+func dioIrqHandler(machine.Pin) {
+	loraRadio.HandleInterrupt()
+}
+
+func main() {
+	time.Sleep(5 * time.Second)
+	println("\n# TinyGo Lora RX/TX test")
+	println("# ----------------------")
+	machine.LED.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	SX127X_PIN_RST.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	SX127X_PIN_CS.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	SX127X_PIN_DIO0.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	SX127X_PIN_DIO1.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+	SX127X_SPI.Configure(machine.SPIConfig{Frequency: 500000, Mode: 0})
+
+	println("main: create and start SX127x driver")
+	loraRadio = sx127x.New(SX127X_SPI, SX127X_PIN_CS, SX127X_PIN_RST)
+	loraRadio.Reset()
+	state := loraRadio.DetectDevice()
+	if !state {
+		panic("main: sx127x NOT FOUND !!!")
+	} else {
+		println("main: sx127x found")
+	}
+
+	// Setup DIO0 interrupt Handling
+	if err := SX127X_PIN_DIO0.SetInterrupt(machine.PinRising, dioIrqHandler); err != nil {
+		println("could not configure DIO0 pin interrupt:", err.Error())
+	}
+
+	// Setup DIO1 interrupt Handling
+	if err := SX127X_PIN_DIO1.SetInterrupt(machine.PinRising, dioIrqHandler); err != nil {
+		println("could not configure DIO1 pin interrupt:", err.Error())
+	}
+
+	// Prepare for Lora Operation
+	loraConf := lora.Config{
+		Freq:           FREQ,
+		Bw:             lora.Bandwidth_500_0,
+		Sf:             lora.SpreadingFactor9,
+		Cr:             lora.CodingRate4_7,
+		HeaderType:     lora.HeaderExplicit,
+		Preamble:       12,
+		Iq:             lora.IQStandard,
+		Crc:            lora.CRCOn,
+		SyncWord:       lora.SyncPrivate,
+		LoraTxPowerDBm: 20,
+	}
+
+	loraRadio.LoraConfig(loraConf)
+
+	var count uint
+	for {
+		tStart := time.Now()
+
+		println("main: Receiving Lora for 10 seconds")
+		for time.Since(tStart) < 10*time.Second {
+			buf, err := loraRadio.Rx(LORA_DEFAULT_RXTIMEOUT_MS)
+			if err != nil {
+				println("RX Error: ", err)
+			} else if buf != nil {
+				println("Packet Received: len=", len(buf), string(buf))
+			}
+		}
+		println("main: End Lora RX")
+		println("LORA TX size=", len(txmsg), " -> ", string(txmsg))
+		err := loraRadio.Tx(txmsg, LORA_DEFAULT_TXTIMEOUT_MS)
+		if err != nil {
+			println("TX Error:", err)
+		}
+		count++
+	}
+
+}

lora/config.go

@@ -0,0 +1,78 @@
+package lora
+
+import "errors"
+
+// Config holds the LoRa configuration parameters
+type Config struct {
+	Freq           uint32 // Frequency
+	Cr             uint8  // Coding Rate
+	Sf             uint8  // Spread Factor
+	Bw             uint8  // Bandwidth
+	Ldr            uint8  // Low Data Rate
+	Preamble       uint16 // PreambleLength
+	SyncWord       uint16 // Sync Word
+	HeaderType     uint8  // Header : Implicit/explicit
+	Crc            uint8  // CRC : Yes/No
+	Iq             uint8  // iq : Standard/inverted
+	LoraTxPowerDBm int8   // Tx power in Dbm
+}
+
+var (
+	ErrUndefinedLoraConf = errors.New("Undefined Lora configuration")
+)
+
+const (
+	SpreadingFactor5  = 0x05
+	SpreadingFactor6  = 0x06
+	SpreadingFactor7  = 0x07
+	SpreadingFactor8  = 0x08
+	SpreadingFactor9  = 0x09
+	SpreadingFactor10 = 0x0A
+	SpreadingFactor11 = 0x0B
+	SpreadingFactor12 = 0x0C
+)
+
+const (
+	CodingRate4_5 = 0x01 //  7     0     LoRa coding rate: 4/5
+	CodingRate4_6 = 0x02 //  7     0                       4/6
+	CodingRate4_7 = 0x03 //  7     0                       4/7
+	CodingRate4_8 = 0x04 //  7     0                       4/8
+)
+
+const (
+	HeaderExplicit = 0x00 //  7     0     LoRa header mode: explicit
+	HeaderImplicit = 0x01 //  7     0                       implicit
+)
+
+const (
+	LowDataRateOptimizeOff = 0x00 //  7     0     LoRa low data rate optimization: disabled
+	LowDataRateOptimizeOn  = 0x01 //  7     0                                      enabled
+)
+
+const (
+	CRCOff = 0x00 //  7     0     LoRa CRC mode: disabled
+	CRCOn  = 0x01 //  7     0                    enabled
+)
+
+const (
+	IQStandard = 0x00 //  7     0     LoRa IQ setup: standard
+	IQInverted = 0x01 //  7     0                    inverted
+)
+
+const (
+	Bandwidth_7_8   = iota // 7.8 kHz
+	Bandwidth_10_4         // 10.4 kHz
+	Bandwidth_15_6         // 15.6 kHz
+	Bandwidth_20_8         // 20.8 kHz
+	Bandwidth_31_25        // 31.25 kHz
+	Bandwidth_41_7         // 41.7 kHz
+	Bandwidth_62_5         // 62.5 kHz
+	Bandwidth_125_0        // 125.0 kHz
+	Bandwidth_250_0        // 250.0 kHz
+	Bandwidth_500_0        // 500.0 kHz
+)
+
+const (
+	SyncPublic = iota
+	SyncPrivate
+)

lora/radio_event.go

@@ -0,0 +1,23 @@
+package lora
+
+const (
+	RadioEventRxDone = iota
+	RadioEventTxDone
+	RadioEventTimeout
+	RadioEventWatchdog
+	RadioEventCrcError
+	RadioEventUnhandled
+)
+
+// RadioEvent are used for communicating in the radio Event Channel
+type RadioEvent struct {
+	EventType int
+	IRQStatus uint16
+	EventData []byte
+}
+
+// NewRadioEvent() returns a new RadioEvent that can be used in the RadioChannel
+func NewRadioEvent(eType int, irqStatus uint16, eData []byte) RadioEvent {
+	r := RadioEvent{EventType: eType, IRQStatus: irqStatus, EventData: eData}
+	return r
+}

sx126x/registers.go

@@ -206,48 +206,42 @@ const (
 	SX126X_PA_RAMP_3400U = 0x07 //  7     0                3400 us
 
 	//SX126X_CMD_SET_MODULATION_PARAMS
-	SX126X_GFSK_FILTER_NONE                = 0x00 //  7     0     GFSK filter: none
+	SX126X_GFSK_FILTER_NONE      = 0x00 //  7     0     GFSK filter: none
-	SX126X_GFSK_FILTER_GAUSS_0_3           = 0x08 //  7     0                  Gaussian, BT = 0.3
+	SX126X_GFSK_FILTER_GAUSS_0_3 = 0x08 //  7     0                  Gaussian, BT = 0.3
-	SX126X_GFSK_FILTER_GAUSS_0_5           = 0x09 //  7     0                  Gaussian, BT = 0.5
+	SX126X_GFSK_FILTER_GAUSS_0_5 = 0x09 //  7     0                  Gaussian, BT = 0.5
-	SX126X_GFSK_FILTER_GAUSS_0_7           = 0x0A //  7     0                  Gaussian, BT = 0.7
+	SX126X_GFSK_FILTER_GAUSS_0_7 = 0x0A //  7     0                  Gaussian, BT = 0.7
-	SX126X_GFSK_FILTER_GAUSS_1             = 0x0B //  7     0                  Gaussian, BT = 1
+	SX126X_GFSK_FILTER_GAUSS_1   = 0x0B //  7     0                  Gaussian, BT = 1
-	SX126X_GFSK_RX_BW_4_8                  = 0x1F //  7     0     GFSK Rx bandwidth: 4.8 kHz
+	SX126X_GFSK_RX_BW_4_8        = 0x1F //  7     0     GFSK Rx bandwidth: 4.8 kHz
-	SX126X_GFSK_RX_BW_5_8                  = 0x17 //  7     0                        5.8 kHz
+	SX126X_GFSK_RX_BW_5_8        = 0x17 //  7     0                        5.8 kHz
-	SX126X_GFSK_RX_BW_7_3                  = 0x0F //  7     0                        7.3 kHz
+	SX126X_GFSK_RX_BW_7_3        = 0x0F //  7     0                        7.3 kHz
-	SX126X_GFSK_RX_BW_9_7                  = 0x1E //  7     0                        9.7 kHz
+	SX126X_GFSK_RX_BW_9_7        = 0x1E //  7     0                        9.7 kHz
-	SX126X_GFSK_RX_BW_11_7                 = 0x16 //  7     0                        11.7 kHz
+	SX126X_GFSK_RX_BW_11_7       = 0x16 //  7     0                        11.7 kHz
-	SX126X_GFSK_RX_BW_14_6                 = 0x0E //  7     0                        14.6 kHz
+	SX126X_GFSK_RX_BW_14_6       = 0x0E //  7     0                        14.6 kHz
-	SX126X_GFSK_RX_BW_19_5                 = 0x1D //  7     0                        19.5 kHz
+	SX126X_GFSK_RX_BW_19_5       = 0x1D //  7     0                        19.5 kHz
-	SX126X_GFSK_RX_BW_23_4                 = 0x15 //  7     0                        23.4 kHz
+	SX126X_GFSK_RX_BW_23_4       = 0x15 //  7     0                        23.4 kHz
-	SX126X_GFSK_RX_BW_29_3                 = 0x0D //  7     0                        29.3 kHz
+	SX126X_GFSK_RX_BW_29_3       = 0x0D //  7     0                        29.3 kHz
-	SX126X_GFSK_RX_BW_39_0                 = 0x1C //  7     0                        39.0 kHz
+	SX126X_GFSK_RX_BW_39_0       = 0x1C //  7     0                        39.0 kHz
-	SX126X_GFSK_RX_BW_46_9                 = 0x14 //  7     0                        46.9 kHz
+	SX126X_GFSK_RX_BW_46_9       = 0x14 //  7     0                        46.9 kHz
-	SX126X_GFSK_RX_BW_58_6                 = 0x0C //  7     0                        58.6 kHz
+	SX126X_GFSK_RX_BW_58_6       = 0x0C //  7     0                        58.6 kHz
-	SX126X_GFSK_RX_BW_78_2                 = 0x1B //  7     0                        78.2 kHz
+	SX126X_GFSK_RX_BW_78_2       = 0x1B //  7     0                        78.2 kHz
-	SX126X_GFSK_RX_BW_93_8                 = 0x13 //  7     0                        93.8 kHz
+	SX126X_GFSK_RX_BW_93_8       = 0x13 //  7     0                        93.8 kHz
-	SX126X_GFSK_RX_BW_117_3                = 0x0B //  7     0                        117.3 kHz
+	SX126X_GFSK_RX_BW_117_3      = 0x0B //  7     0                        117.3 kHz
-	SX126X_GFSK_RX_BW_156_2                = 0x1A //  7     0                        156.2 kHz
+	SX126X_GFSK_RX_BW_156_2      = 0x1A //  7     0                        156.2 kHz
-	SX126X_GFSK_RX_BW_187_2                = 0x12 //  7     0                        187.2 kHz
+	SX126X_GFSK_RX_BW_187_2      = 0x12 //  7     0                        187.2 kHz
-	SX126X_GFSK_RX_BW_234_3                = 0x0A //  7     0                        234.3 kHz
+	SX126X_GFSK_RX_BW_234_3      = 0x0A //  7     0                        234.3 kHz
-	SX126X_GFSK_RX_BW_312_0                = 0x19 //  7     0                        312.0 kHz
+	SX126X_GFSK_RX_BW_312_0      = 0x19 //  7     0                        312.0 kHz
-	SX126X_GFSK_RX_BW_373_6                = 0x11 //  7     0                        373.6 kHz
+	SX126X_GFSK_RX_BW_373_6      = 0x11 //  7     0                        373.6 kHz
-	SX126X_GFSK_RX_BW_467_0                = 0x09 //  7     0                        467.0 kHz
+	SX126X_GFSK_RX_BW_467_0      = 0x09 //  7     0                        467.0 kHz
-	SX126X_LORA_BW_7_8                     = 0x00 //  7     0     LoRa bandwidth: 7.8 kHz
+	SX126X_LORA_BW_7_8           = 0x00 //  7     0     LoRa bandwidth: 7.8 kHz
-	SX126X_LORA_BW_10_4                    = 0x08 //  7     0                     10.4 kHz
+	SX126X_LORA_BW_10_4          = 0x08 //  7     0                     10.4 kHz
-	SX126X_LORA_BW_15_6                    = 0x01 //  7     0                     15.6 kHz
+	SX126X_LORA_BW_15_6          = 0x01 //  7     0                     15.6 kHz
-	SX126X_LORA_BW_20_8                    = 0x09 //  7     0                     20.8 kHz
+	SX126X_LORA_BW_20_8          = 0x09 //  7     0                     20.8 kHz
-	SX126X_LORA_BW_31_25                   = 0x02 //  7     0                     31.25 kHz
+	SX126X_LORA_BW_31_25         = 0x02 //  7     0                     31.25 kHz
-	SX126X_LORA_BW_41_7                    = 0x0A //  7     0                     41.7 kHz
+	SX126X_LORA_BW_41_7          = 0x0A //  7     0                     41.7 kHz
-	SX126X_LORA_BW_62_5                    = 0x03 //  7     0                     62.5 kHz
+	SX126X_LORA_BW_62_5          = 0x03 //  7     0                     62.5 kHz
-	SX126X_LORA_BW_125_0                   = 0x04 //  7     0                     125.0 kHz
+	SX126X_LORA_BW_125_0         = 0x04 //  7     0                     125.0 kHz
-	SX126X_LORA_BW_250_0                   = 0x05 //  7     0                     250.0 kHz
+	SX126X_LORA_BW_250_0         = 0x05 //  7     0                     250.0 kHz
-	SX126X_LORA_BW_500_0                   = 0x06 //  7     0                     500.0 kHz
+	SX126X_LORA_BW_500_0         = 0x06 //  7     0                     500.0 kHz
-	SX126X_LORA_CR_4_5                     = 0x01 //  7     0     LoRa coding rate: 4/5
-	SX126X_LORA_CR_4_6                     = 0x02 //  7     0                       4/6
-	SX126X_LORA_CR_4_7                     = 0x03 //  7     0                       4/7
-	SX126X_LORA_CR_4_8                     = 0x04 //  7     0                       4/8
-	SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_OFF = 0x00 //  7     0     LoRa low data rate optimization: disabled
-	SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_ON  = 0x01 //  7     0                                      enabled
 
 	//SX126X_CMD_SET_PACKET_PARAMS
 	SX126X_GFSK_PREAMBLE_DETECT_OFF         = 0x00 //  7     0     GFSK minimum preamble length before reception starts: detector disabled
@@ -267,12 +261,6 @@ const (
 	SX126X_GFSK_CRC_2_BYTE_INV              = 0x06 //  7     0                      2 byte, inverted
 	SX126X_GFSK_WHITENING_OFF               = 0x00 //  7     0     GFSK data whitening: disabled
 	SX126X_GFSK_WHITENING_ON                = 0x01 //  7     0                          enabled
-	SX126X_LORA_HEADER_EXPLICIT             = 0x00 //  7     0     LoRa header mode: explicit
-	SX126X_LORA_HEADER_IMPLICIT             = 0x01 //  7     0                       implicit
-	SX126X_LORA_CRC_OFF                     = 0x00 //  7     0     LoRa CRC mode: disabled
-	SX126X_LORA_CRC_ON                      = 0x01 //  7     0                    enabled
-	SX126X_LORA_IQ_STANDARD                 = 0x00 //  7     0     LoRa IQ setup: standard
-	SX126X_LORA_IQ_INVERTED                 = 0x01 //  7     0                    inverted
 
 	//SX126X_CMD_SET_CAD_PARAMS
 	SX126X_CAD_ON_1_SYMB  = 0x00 //  7     0     number of symbols used for CAD: 1
@@ -323,13 +311,4 @@ const (
 
 	SX126X_LORA_MAC_PUBLIC_SYNCWORD  = 0x3444
 	SX126X_LORA_MAC_PRIVATE_SYNCWORD = 0x1424
-
-	SX126X_LORA_SF5  = 0x05
-	SX126X_LORA_SF6  = 0x06
-	SX126X_LORA_SF7  = 0x07
-	SX126X_LORA_SF8  = 0x08
-	SX126X_LORA_SF9  = 0x09
-	SX126X_LORA_SF10 = 0x0A
-	SX126X_LORA_SF11 = 0x0B
-	SX126X_LORA_SF12 = 0x0C
 )

sx126x/spi_stm32wl.go

@@ -7,11 +7,12 @@ import (
 	"errors"
 	"machine"
 	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/lora"
 )
 
 // New creates a new SX126x connection.
 func New(spi drivers.SPI) *Device {
-	c := make(chan RadioEvent, 10)
+	c := make(chan lora.RadioEvent, 10)
 	d := Device{
 		spi:            spi,
 		radioEventChan: c,

sx126x/sx126x.go

@@ -7,7 +7,10 @@ import (
 	"errors"
 	"time"
 
+	"machine"
+
 	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/lora"
 )
 
 // SX126X radio transceiver RF_IN and RF_OUT may be connected
@@ -30,22 +33,6 @@ const (
 	RFSWITCH_TX_HP = iota
 )
 
-const (
-	RadioEventRxDone    = iota
-	RadioEventTxDone    = iota
-	RadioEventTimeout   = iota
-	RadioEventWatchdog  = iota
-	RadioEventCrcError  = iota
-	RadioEventUnhandled = iota
-)
-
-// RadioEvent are used for communicating in the radio Event Channel
-type RadioEvent struct {
-	EventType int
-	IRQStatus uint16
-	EventData []byte
-}
-
 const (
 	PERIOD_PER_SEC  = (uint32)(1000000 / 15.625) // SX1261 DS 13.1.4
 	SPI_BUFFER_SIZE = 256
@@ -53,38 +40,20 @@ const (
 
 // Device wraps an SPI connection to a SX127x device.
 type Device struct {
-	spi            drivers.SPI     // SPI bus for module communication
+	spi            drivers.SPI          // SPI bus for module communication
-	radioEventChan chan RadioEvent // Channel for Receiving events
+	rstPin, csPin  machine.Pin          // GPIOs for reset and chip select
-	loraConf       LoraConfig      // Current Lora configuration
+	radioEventChan chan lora.RadioEvent // Channel for Receiving events
-	rfswitch       RFSwitch        // RF Switch, if any
+	loraConf       lora.Config          // Current Lora configuration
-	deepSleep      bool            // Internal Sleep state
+	rfswitch       RFSwitch             // RF Switch, if any
-	deviceType     int             // sx1261,sx1262,sx1268 (defaults sx1261)
+	deepSleep      bool                 // Internal Sleep state
+	deviceType     int                  // sx1261,sx1262,sx1268 (defaults sx1261)
 	spiBuffer      [SPI_BUFFER_SIZE]uint8
 }
 
-// Config holds the LoRa configuration parameters
-type LoraConfig struct {
-	Freq           uint32 // Frequency
-	Cr             uint8  // Coding Rate
-	Sf             uint8  // Spread Factor
-	Bw             uint8  // Bandwidth
-	Ldr            uint8  // Low Data Rate
-	Preamble       uint16 // PreambleLength
-	SyncWord       uint16 // Sync Word
-	HeaderType     uint8  // Header : Implicit/explicit
-	Crc            uint8  // CRC : Yes/No
-	Iq             uint8  // iq : Standard/inverted
-	LoraTxPowerDBm int8   // Tx power in Dbm
-}
-
 const (
 	SX126X_RTC_FREQ_IN_HZ uint32 = 64000
 )
 
-var (
-	errUndefinedLoraConf = errors.New("Undefined Lora configuration")
-)
-
 // --------------------------------------------------
 //  Helper functions
 // --------------------------------------------------
@@ -100,14 +69,8 @@ func timeoutMsToRtcSteps(timeoutMs uint32) uint32 {
 //	Channel and events
 //
 // --------------------------------------------------
-// NewRadioEvent() returns a new RadioEvent that can be used in the RadioChannel
-func NewRadioEvent(eType int, irqStatus uint16, eData []byte) RadioEvent {
-	r := RadioEvent{EventType: eType, IRQStatus: irqStatus, EventData: eData}
-	return r
-}
-
 // Get the RadioEvent channel of the device
-func (d *Device) GetRadioEventChan() chan RadioEvent {
+func (d *Device) GetRadioEventChan() chan lora.RadioEvent {
 	return d.radioEventChan
 }
 
@@ -126,6 +89,13 @@ func (d *Device) SetRfSwitch(rfswitch RFSwitch) {
 // Operational modes functions
 // --------------------------------------------------
 
+func (d *Device) Reset() {
+	d.rstPin.Low()
+	time.Sleep(100 * time.Millisecond)
+	d.rstPin.High()
+	time.Sleep(100 * time.Millisecond)
+}
+
 // DetectDevice() tries to detect the radio module by changing SyncWord value
 func (d *Device) DetectDevice() bool {
 	bak := d.GetSyncWord()
@@ -163,7 +133,7 @@ func (d *Device) SetTxContinuousWave() {
 }
 
 // SetTxContinuousPreamble set device in test mode to constantly modulate LoRa preamble symbols.
-// Take care to initialize all Lora settings like it's done in LoraTx before calling this function
+// Take care to initialize all Lora settings like it's done in Tx before calling this function
 // If you don't init properly all the settings, it'll fail
 func (d *Device) SetTxContinuousPreamble() {
 	if d.rfswitch != nil {
@@ -387,11 +357,11 @@ func (d *Device) SetPacketType(packetType uint8) {
 }
 
 // SetSyncWord defines the Sync Word to yse
-func (d *Device) SetSyncWord(syncword uint16) {
+func (d *Device) SetSyncWord(sw uint16) {
 	var p [2]uint8
-	d.loraConf.SyncWord = syncword
+	d.loraConf.SyncWord = sw
-	p[0] = uint8((syncword >> 8) & 0xFF)
+	p[0] = uint8((d.loraConf.SyncWord >> 8) & 0xFF)
-	p[1] = uint8((syncword >> 0) & 0xFF)
+	p[1] = uint8((d.loraConf.SyncWord >> 0) & 0xFF)
 	d.WriteRegister(SX126X_REG_LORA_SYNC_WORD_MSB, p[:])
 }
 
@@ -402,8 +372,8 @@ func (d *Device) GetSyncWord() uint16 {
 	return r
 }
 
-// SetLoraPublicNetwork sets Sync Word to 0x3444 (Public) or 0x1424 (Private)
+// SetPublicNetwork sets Sync Word to 0x3444 (Public) or 0x1424 (Private)
-func (d *Device) SetLoraPublicNetwork(enable bool) {
+func (d *Device) SetPublicNetwork(enable bool) {
 	if enable {
 		d.SetSyncWord(SX126X_LORA_MAC_PUBLIC_SYNCWORD)
 	} else {
@@ -537,47 +507,47 @@ func (d *Device) ExecGetCommand(cmd uint8, size uint8) []uint8 {
 // Configuration
 //
 
-// SetLoraFrequency() Sets current Lora Frequency
+// SetFrequency() Sets current Lora Frequency
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraFrequency(freq uint32) {
+func (d *Device) SetFrequency(freq uint32) {
 	d.loraConf.Freq = d.loraConf.Freq
 }
 
-// SetLoraIqMode() defines the current IQ Mode (Standard/Inverted)
+// SetIqMode() defines the current IQ Mode (Standard/Inverted)
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraIqMode(mode uint8) {
+func (d *Device) SetIqMode(mode uint8) {
 	if mode == 0 {
-		d.loraConf.Iq = SX126X_LORA_IQ_STANDARD
+		d.loraConf.Iq = lora.IQStandard
 	} else {
-		d.loraConf.Iq = SX126X_LORA_IQ_INVERTED
+		d.loraConf.Iq = lora.IQInverted
 	}
 }
 
-// SetLoraCodingRate() sets current Lora Coding Rate
+// SetCodingRate() sets current Lora Coding Rate
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraCodingRate(cr uint8) {
+func (d *Device) SetCodingRate(cr uint8) {
 	d.loraConf.Cr = cr
 }
 
-// SetLoraBandwidth() sets current Lora Bandwidth
+// SetBandwidth() sets current Lora Bandwidth
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraBandwidth(bw uint8) {
+func (d *Device) SetBandwidth(bw uint8) {
 	d.loraConf.Cr = bw
 }
 
-// SetLoraCrc() sets current CRC mode (ON/OFF)
+// SetCrc() sets current CRC mode (ON/OFF)
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraCrc(enable bool) {
+func (d *Device) SetCrc(enable bool) {
 	if enable {
-		d.loraConf.Crc = SX126X_LORA_CRC_ON
+		d.loraConf.Crc = lora.CRCOn
 	} else {
-		d.loraConf.Crc = SX126X_LORA_CRC_OFF
+		d.loraConf.Crc = lora.CRCOn
 	}
 }
 
-// SetLoraSpreadingFactor setc surrent Lora Spreading Factor
+// SetSpreadingFactor setc surrent Lora Spreading Factor
 // NB: Change will be applied at next RX / TX
-func (d *Device) SetLoraSpreadingFactor(sf uint8) {
+func (d *Device) SetSpreadingFactor(sf uint8) {
 	d.loraConf.Sf = sf
 }
 
@@ -587,9 +557,10 @@ func (d *Device) SetLoraSpreadingFactor(sf uint8) {
 //
 
 // LoraConfig() defines Lora configuration for next Lora operations
-func (d *Device) LoraConfig(cnf LoraConfig) {
+func (d *Device) LoraConfig(cnf lora.Config) {
 	// Save given configuration
 	d.loraConf = cnf
+	d.loraConf.SyncWord = syncword(int(cnf.SyncWord))
 	// Switch to standby prior to configuration changes
 	d.SetStandby()
 	// Clear errors, disable radio interrupts for the moment
@@ -599,24 +570,25 @@ func (d *Device) LoraConfig(cnf LoraConfig) {
 	// Define radio operation mode
 	d.SetPacketType(SX126X_PACKET_TYPE_LORA)
 	d.SetRfFrequency(d.loraConf.Freq)
-	d.SetModulationParams(d.loraConf.Sf, d.loraConf.Bw, d.loraConf.Cr, d.loraConf.Ldr)
+	d.SetModulationParams(d.loraConf.Sf, bandwidth(d.loraConf.Bw), d.loraConf.Cr, d.loraConf.Ldr)
 	d.SetTxParams(d.loraConf.LoraTxPowerDBm, SX126X_PA_RAMP_200U)
 	d.SetSyncWord(d.loraConf.SyncWord)
 	d.SetBufferBaseAddress(0, 0)
 }
 
-// LoraTx sends a lora packet, (with timeout)
+// Tx sends a lora packet, (with timeout)
-func (d *Device) LoraTx(pkt []uint8, timeoutMs uint32) error {
+func (d *Device) Tx(pkt []uint8, timeoutMs uint32) error {
-
 	if d.loraConf.Freq == 0 {
-		return errUndefinedLoraConf
+		return lora.ErrUndefinedLoraConf
 	}
+
 	if d.rfswitch != nil {
 		err := d.rfswitch.SetRfSwitchMode(RFSWITCH_TX_HP)
 		if err != nil {
 			return err
 		}
 	}
+
 	d.ClearIrqStatus(SX126X_IRQ_ALL)
 	irqVal := uint16(SX126X_IRQ_TX_DONE | SX126X_IRQ_TIMEOUT | SX126X_IRQ_CRC_ERR)
 	d.SetStandby()
@@ -625,45 +597,46 @@ func (d *Device) LoraTx(pkt []uint8, timeoutMs uint32) error {
 	d.SetTxParams(d.loraConf.LoraTxPowerDBm, SX126X_PA_RAMP_200U)
 	d.SetBufferBaseAddress(0, 0)
 	d.WriteBuffer(pkt)
-	d.SetModulationParams(d.loraConf.Sf, d.loraConf.Bw, d.loraConf.Cr, d.loraConf.Ldr)
+	d.SetModulationParams(d.loraConf.Sf, bandwidth(d.loraConf.Bw), d.loraConf.Cr, d.loraConf.Ldr)
 	d.SetPacketParam(d.loraConf.Preamble, d.loraConf.HeaderType, d.loraConf.Crc, uint8(len(pkt)), d.loraConf.Iq)
 	d.SetDioIrqParams(irqVal, irqVal, SX126X_IRQ_NONE, SX126X_IRQ_NONE)
 	d.SetSyncWord(d.loraConf.SyncWord)
 	d.SetTx(timeoutMsToRtcSteps(timeoutMs))
 
 	msg := <-d.GetRadioEventChan()
-	if msg.EventType != RadioEventTxDone {
+	if msg.EventType != lora.RadioEventTxDone {
 		return errors.New("Unexpected Radio Event while TX")
 	}
 	return nil
 }
 
 // LoraRx tries to receive a Lora packet (with timeout in milliseconds)
-func (d *Device) LoraRx(timeoutMs uint32) ([]uint8, error) {
+func (d *Device) Rx(timeoutMs uint32) ([]uint8, error) {
-
 	if d.loraConf.Freq == 0 {
-		return nil, errUndefinedLoraConf
+		return nil, lora.ErrUndefinedLoraConf
 	}
+
 	if d.rfswitch != nil {
 		err := d.rfswitch.SetRfSwitchMode(RFSWITCH_RX)
 		if err != nil {
 			return nil, err
 		}
 	}
+
 	d.ClearIrqStatus(SX126X_IRQ_ALL)
 	irqVal := uint16(SX126X_IRQ_RX_DONE | SX126X_IRQ_TIMEOUT | SX126X_IRQ_CRC_ERR)
 	d.SetStandby()
 	d.SetBufferBaseAddress(0, 0)
-	d.SetModulationParams(d.loraConf.Sf, d.loraConf.Bw, d.loraConf.Cr, d.loraConf.Ldr)
+	d.SetModulationParams(d.loraConf.Sf, bandwidth(d.loraConf.Bw), d.loraConf.Cr, d.loraConf.Ldr)
 	d.SetPacketParam(d.loraConf.Preamble, d.loraConf.HeaderType, d.loraConf.Crc, 0xFF, d.loraConf.Iq)
 	d.SetDioIrqParams(irqVal, irqVal, SX126X_IRQ_NONE, SX126X_IRQ_NONE)
 	d.SetRx(timeoutMsToRtcSteps(timeoutMs))
 
 	msg := <-d.GetRadioEventChan()
 
-	if msg.EventType == RadioEventTimeout {
+	if msg.EventType == lora.RadioEventTimeout {
 		return nil, nil
-	} else if msg.EventType != RadioEventRxDone {
+	} else if msg.EventType != lora.RadioEventRxDone {
 		return nil, errors.New("Unexpected Radio Event while RX")
 	}
 
@@ -683,19 +656,53 @@ func (d *Device) HandleInterrupt() {
 	rChan := d.GetRadioEventChan()
 
 	if (st & SX126X_IRQ_RX_DONE) > 0 {
-		rChan <- NewRadioEvent(RadioEventRxDone, st, nil)
+		rChan <- lora.NewRadioEvent(lora.RadioEventRxDone, st, nil)
 	}
 
 	if (st & SX126X_IRQ_TX_DONE) > 0 {
-		rChan <- NewRadioEvent(RadioEventTxDone, st, nil)
+		rChan <- lora.NewRadioEvent(lora.RadioEventTxDone, st, nil)
 	}
 
 	if (st & SX126X_IRQ_TIMEOUT) > 0 {
-		rChan <- NewRadioEvent(RadioEventTimeout, st, nil)
+		rChan <- lora.NewRadioEvent(lora.RadioEventTimeout, st, nil)
 	}
 
 	if (st & SX126X_IRQ_CRC_ERR) > 0 {
-		rChan <- NewRadioEvent(RadioEventCrcError, st, nil)
+		rChan <- lora.NewRadioEvent(lora.RadioEventCrcError, st, nil)
 	}
 
 }
+
+func bandwidth(bw uint8) uint8 {
+	switch bw {
+	case lora.Bandwidth_7_8:
+		return SX126X_LORA_BW_7_8
+	case lora.Bandwidth_10_4:
+		return SX126X_LORA_BW_10_4
+	case lora.Bandwidth_15_6:
+		return SX126X_LORA_BW_15_6
+	case lora.Bandwidth_20_8:
+		return SX126X_LORA_BW_20_8
+	case lora.Bandwidth_31_25:
+		return SX126X_LORA_BW_31_25
+	case lora.Bandwidth_41_7:
+		return SX126X_LORA_BW_41_7
+	case lora.Bandwidth_62_5:
+		return SX126X_LORA_BW_62_5
+	case lora.Bandwidth_125_0:
+		return SX126X_LORA_BW_125_0
+	case lora.Bandwidth_250_0:
+		return SX126X_LORA_BW_250_0
+	case lora.Bandwidth_500_0:
+		return SX126X_LORA_BW_500_0
+	default:
+		return 0
+	}
+}
+
+func syncword(sw int) uint16 {
+	if sw == lora.SyncPublic {
+		return SX126X_LORA_MAC_PUBLIC_SYNCWORD
+	}
+	return SX126X_LORA_MAC_PRIVATE_SYNCWORD
+}

sx127x/registers.go

@@ -0,0 +1,101 @@
+package sx127x
+
+const (
+	// registers
+	SX127X_REG_FIFO                 = 0x00
+	SX127X_REG_OP_MODE              = 0x01
+	SX127X_REG_FRF_MSB              = 0x06
+	SX127X_REG_FRF_MID              = 0x07
+	SX127X_REG_FRF_LSB              = 0x08
+	SX127X_REG_PA_CONFIG            = 0x09
+	SX127X_REG_PA_RAMP              = 0x0a
+	SX127X_REG_OCP                  = 0x0b
+	SX127X_REG_LNA                  = 0x0c
+	SX127X_REG_FIFO_ADDR_PTR        = 0x0d
+	SX127X_REG_FIFO_TX_BASE_ADDR    = 0x0e
+	SX127X_REG_FIFO_RX_BASE_ADDR    = 0x0f
+	SX127X_REG_FIFO_RX_CURRENT_ADDR = 0x10
+	SX127X_REG_IRQ_FLAGS_MASK       = 0x11
+	SX127X_REG_IRQ_FLAGS            = 0x12
+	SX127X_REG_RX_NB_BYTES          = 0x13
+	SX127X_REG_PKT_SNR_VALUE        = 0x19
+	SX127X_REG_PKT_RSSI_VALUE       = 0x1a
+	SX127X_REG_RSSI_VALUE           = 0x1b
+	SX127X_REG_MODEM_CONFIG_1       = 0x1d
+	SX127X_REG_MODEM_CONFIG_2       = 0x1e
+	SX127X_REG_SYMB_TIMEOUT_LSB     = 0x1f
+	SX127X_REG_PREAMBLE_MSB         = 0x20
+	SX127X_REG_PREAMBLE_LSB         = 0x21
+	SX127X_REG_PAYLOAD_LENGTH       = 0x22
+	SX127X_REG_MAX_PAYLOAD_LENGTH   = 0x23
+	SX127X_REG_HOP_PERIOD           = 0x24
+	SX127X_REG_MODEM_CONFIG_3       = 0x26
+	SX127X_REG_FREQ_ERROR_MSB       = 0x28
+	SX127X_REG_FREQ_ERROR_MID       = 0x29
+	SX127X_REG_FREQ_ERROR_LSB       = 0x2a
+	SX127X_REG_RSSI_WIDEBAND        = 0x2c
+	SX127X_REG_DETECTION_OPTIMIZE   = 0x31
+	SX127X_REG_INVERTIQ             = 0x33
+	SX127X_REG_DETECTION_THRESHOLD  = 0x37
+	SX127X_REG_SYNC_WORD            = 0x39
+	SX127X_REG_INVERTIQ2            = 0x3b
+	SX127X_REG_DIO_MAPPING_1        = 0x40
+	SX127X_REG_DIO_MAPPING_2        = 0x41
+	SX127X_REG_VERSION              = 0x42
+	SX127X_REG_PA_DAC               = 0x4d
+	// PA config
+	SX127X_PA_BOOST = 0x80
+
+	// Bits masking the corresponding IRQs from the radio
+	SX127X_IRQ_LORA_RXTOUT_MASK = uint8(0x80)
+	SX127X_IRQ_LORA_RXDONE_MASK = uint8(0x40)
+	SX127X_IRQ_LORA_CRCERR_MASK = uint8(0x20)
+	SX127X_IRQ_LORA_HEADER_MASK = uint8(0x10)
+	SX127X_IRQ_LORA_TXDONE_MASK = uint8(0x08)
+	SX127X_IRQ_LORA_CDDONE_MASK = uint8(0x04)
+	SX127X_IRQ_LORA_FHSSCH_MASK = uint8(0x02)
+	SX127X_IRQ_LORA_CDDETD_MASK = uint8(0x01)
+
+	// DIO function mappings                D0D1D2D3
+	SX127X_MAP_DIO0_LORA_RXDONE = uint8(0x00) // 00------
+	SX127X_MAP_DIO0_LORA_TXDONE = uint8(0x40) // 01------
+	SX127X_MAP_DIO1_LORA_RXTOUT = uint8(0x00) // --00----
+	SX127X_MAP_DIO1_LORA_NOP    = uint8(0x30) // --11----
+	SX127X_MAP_DIO2_LORA_NOP    = uint8(0xC0) // ----11--
+
+	SX127X_PAYLOAD_LENGTH = uint8(0x40)
+
+	// Low Noise Amp
+	SX127X_LNA_MAX_GAIN = uint8(0x23)
+	SX127X_LNA_OFF_GAIN = uint8(0x00)
+	SX127X_LNA_LOW_GAIN = uint8(0x20)
+
+	// Bandwidth
+	SX127X_LORA_BW_7_8   = uint8(0x00)
+	SX127X_LORA_BW_10_4  = uint8(0x01)
+	SX127X_LORA_BW_15_6  = uint8(0x02)
+	SX127X_LORA_BW_20_8  = uint8(0x03)
+	SX127X_LORA_BW_31_25 = uint8(0x04)
+	SX127X_LORA_BW_41_7  = uint8(0x05)
+	SX127X_LORA_BW_62_5  = uint8(0x06)
+	SX127X_LORA_BW_125_0 = uint8(0x07)
+	SX127X_LORA_BW_250_0 = uint8(0x08)
+	SX127X_LORA_BW_500_0 = uint8(0x09)
+	// Automatic gain control
+	SX127X_AGC_AUTO_OFF = uint8(0x00)
+	SX127X_AGC_AUTO_ON  = uint8(0x01)
+	// Operation modes
+	SX127X_OPMODE_LORA      = uint8(0x80)
+	SX127X_OPMODE_MASK      = uint8(0x07)
+	SX127X_OPMODE_SLEEP     = uint8(0x00)
+	SX127X_OPMODE_STANDBY   = uint8(0x01)
+	SX127X_OPMODE_FSTX      = uint8(0x02)
+	SX127X_OPMODE_TX        = uint8(0x03)
+	SX127X_OPMODE_FSRX      = uint8(0x04)
+	SX127X_OPMODE_RX        = uint8(0x05)
+	SX127X_OPMODE_RX_SINGLE = uint8(0x06)
+	SX127X_OPMODE_CAD       = uint8(0x07)
+
+	SX127X_LORA_MAC_PUBLIC_SYNCWORD  = 0x34
+	SX127X_LORA_MAC_PRIVATE_SYNCWORD = 0x14
+)

sx127x/sx127x.go

@@ -0,0 +1,530 @@
+// Package sx127x provides a driver for SX127x LoRa transceivers.
+// References:
+// https://electronics.stackexchange.com/questions/394296/can-t-get-simple-lora-receiver-to-work
+// https://www.st.com/resource/en/user_manual/dm00300436-stm32-lora-expansion-package-for-stm32cube-stmicroelectronics.pdf
+package sx127x
+
+import (
+	"errors"
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers"
+	"tinygo.org/x/drivers/lora"
+)
+
+// So we can keep track of the origin of interruption
+const (
+	SPI_BUFFER_SIZE = 256
+)
+
+// Device wraps an SPI connection to a SX127x device.
+type Device struct {
+	spi            drivers.SPI          // SPI bus for module communication
+	rstPin, csPin  machine.Pin          // GPIOs for reset and chip select
+	radioEventChan chan lora.RadioEvent // Channel for Receiving events
+	loraConf       lora.Config          // Current Lora configuration
+	deepSleep      bool                 // Internal Sleep state
+	deviceType     int                  // sx1261,sx1262,sx1268 (defaults sx1261)
+	spiBuffer      [SPI_BUFFER_SIZE]uint8
+	packetIndex    uint8 // FIXME ... useless ?
+}
+
+// --------------------------------------------------
+//
+//	Channel and events
+//
+// --------------------------------------------------
+// Get the RadioEvent channel of the device
+func (d *Device) GetRadioEventChan() chan lora.RadioEvent {
+	return d.radioEventChan
+}
+
+// New creates a new SX127x connection. The SPI bus must already be configured.
+func New(spi machine.SPI, csPin machine.Pin, rstPin machine.Pin) *Device {
+	k := Device{
+		spi:            spi,
+		csPin:          csPin,
+		rstPin:         rstPin,
+		radioEventChan: make(chan lora.RadioEvent, 10),
+	}
+	return &k
+}
+
+// Reset re-initialize the sx127x device
+func (d *Device) Reset() {
+	d.rstPin.Low()
+	time.Sleep(100 * time.Millisecond)
+	d.rstPin.High()
+	time.Sleep(100 * time.Millisecond)
+}
+
+// DetectDevice checks if device responds on the SPI bus
+func (d *Device) DetectDevice() bool {
+	id := d.GetVersion()
+	return (id == 0x12)
+}
+
+// ReadRegister reads register value
+func (d *Device) ReadRegister(reg uint8) uint8 {
+	d.csPin.Low()
+	d.spi.Tx([]byte{reg & 0x7f}, nil)
+	var value [1]byte
+	d.spi.Tx(nil, value[:])
+	d.csPin.High()
+	return value[0]
+}
+
+// WriteRegister writes value to register
+func (d *Device) WriteRegister(reg uint8, value uint8) uint8 {
+	var response [1]byte
+	d.csPin.Low()
+	d.spi.Tx([]byte{reg | 0x80}, nil)
+	d.spi.Tx([]byte{value}, response[:])
+	d.csPin.High()
+	return response[0]
+}
+
+// SetOpMode changes the sx1276 mode
+func (d *Device) SetOpMode(mode uint8) {
+	cur := d.ReadRegister(SX127X_REG_OP_MODE)
+	new := (cur & (^SX127X_OPMODE_MASK)) | mode
+	d.WriteRegister(SX127X_REG_OP_MODE, new)
+}
+
+// SetOpMode changes the sx1276 mode
+func (d *Device) SetOpModeLora() {
+	d.WriteRegister(SX127X_REG_OP_MODE, SX127X_OPMODE_LORA)
+}
+
+// GetVersion returns hardware version of sx1276 chipset
+func (d *Device) GetVersion() uint8 {
+	return (d.ReadRegister(SX127X_REG_VERSION))
+}
+
+// IsTransmitting tests if a packet transmission is in progress
+func (d *Device) IsTransmitting() bool {
+	return (d.ReadRegister(SX127X_REG_OP_MODE) & SX127X_OPMODE_TX) == SX127X_OPMODE_TX
+}
+
+// LastPacketRSSI gives the RSSI of the last packet received
+func (d *Device) LastPacketRSSI() uint8 {
+	// section 5.5.5
+	var adjustValue uint8 = 157
+	if d.loraConf.Freq < 868000000 {
+		adjustValue = 164
+	}
+	return d.ReadRegister(SX127X_REG_PKT_RSSI_VALUE) - adjustValue
+}
+
+// LastPacketSNR gives the SNR of the last packet received
+func (d *Device) LastPacketSNR() uint8 {
+	return uint8(d.ReadRegister(SX127X_REG_PKT_SNR_VALUE) / 4)
+}
+
+// GetRSSI returns current RSSI
+func (d *Device) GetRSSI() uint8 {
+	return d.ReadRegister(SX127X_REG_RSSI_VALUE)
+}
+
+/*
+// GetBandwidth returns the bandwidth the LoRa module is using
+func (d *Device) GetBandwidth() int32 {
+	return int32(d.loraConf.Bw)
+}
+*/
+
+// SetTxPower sets the transmitter output power
+func (d *Device) SetTxPower(txPower int8, paBoost bool) {
+	if !paBoost {
+		// RFO
+		if txPower < 0 {
+			txPower = 0
+		} else if txPower > 14 {
+			txPower = 14
+		}
+		d.WriteRegister(SX127X_REG_PA_CONFIG, uint8(0x70)|uint8(txPower))
+
+	} else {
+		//PA_BOOST
+		if txPower > 17 {
+			if txPower > 20 {
+				txPower = 20
+			}
+
+			txPower -= 3
+
+			// High Power +20 dBm Operation (Semtech SX1276/77/78/79 5.4.3.)
+			d.WriteRegister(SX127X_REG_PA_DAC, 0x87)
+			d.SetOCP(140)
+		} else {
+			if txPower < 2 {
+				txPower = 2
+			}
+
+			d.WriteRegister(SX127X_REG_PA_DAC, 0x84)
+			d.SetOCP(100)
+
+		}
+
+		d.WriteRegister(SX127X_REG_PA_CONFIG, uint8(SX127X_PA_BOOST)|uint8(txPower-2))
+
+	}
+}
+
+// ---------------
+// Internal functions
+// ---------------
+
+// SetRxTimeout defines RX Timeout expressed as number of symbols
+// Default timeout is 64 * Ts
+func (d *Device) SetRxTimeout(tmoutSymb uint8) {
+	d.WriteRegister(SX127X_REG_SYMB_TIMEOUT_LSB, tmoutSymb)
+}
+
+// SetOCP defines Overload Current Protection configuration
+func (d *Device) SetOCP(mA uint8) {
+	ocpTrim := uint8(27)
+	if mA < 45 {
+		mA = 45
+	}
+	if mA <= 120 {
+		ocpTrim = (mA - 45) / 5
+	} else if mA <= 240 {
+		ocpTrim = (mA + 30) / 10
+	}
+	d.WriteRegister(SX127X_REG_OCP, 0x20|(0x1F&ocpTrim))
+}
+
+// SetAgcAutoOn enables Automatic Gain Control
+func (d *Device) SetAgcAuto(val uint8) {
+	if val == SX127X_AGC_AUTO_ON {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_3, d.ReadRegister(SX127X_REG_MODEM_CONFIG_3)|0x04)
+	} else {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_3, d.ReadRegister(SX127X_REG_MODEM_CONFIG_3)&0xfb)
+	}
+}
+
+// SetLowDataRateOptimize enables Low Data Rate Optimization
+func (d *Device) SetLowDataRateOptim(val uint8) {
+	if val == lora.LowDataRateOptimizeOn {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_3, d.ReadRegister(SX127X_REG_MODEM_CONFIG_3)|0x08)
+	} else {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_3, d.ReadRegister(SX127X_REG_MODEM_CONFIG_3)&0xf7)
+	}
+}
+
+// SetLowFrequencyModeOn enables Low Data Rate Optimization
+func (d *Device) SetLowFrequencyModeOn(val bool) {
+	if val {
+		d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)|0x04)
+	} else {
+		d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)&0xfb)
+	}
+}
+
+// SetHopPeriod sets number of symbol periods between frequency hops. (0 = disabled).
+func (d *Device) SetHopPeriod(val uint8) {
+	d.WriteRegister(SX127X_REG_HOP_PERIOD, val)
+}
+
+//
+// LORA FUNCTIONS
+//
+
+// LoraConfig() defines Lora configuration for next Lora operations
+func (d *Device) LoraConfig(cnf lora.Config) {
+	// Save given configuration
+	d.loraConf = cnf
+	d.loraConf.SyncWord = syncword(int(cnf.SyncWord))
+}
+
+// SetFrequency updates the frequency the LoRa module is using
+func (d *Device) SetFrequency(frequency uint32) {
+	d.loraConf.Freq = frequency
+	var frf = (uint64(frequency) << 19) / 32000000
+	d.WriteRegister(SX127X_REG_FRF_MSB, uint8(frf>>16))
+	d.WriteRegister(SX127X_REG_FRF_MID, uint8(frf>>8))
+	d.WriteRegister(SX127X_REG_FRF_LSB, uint8(frf>>0))
+}
+
+// SetBandwidth updates the bandwidth the LoRa module is using
+func (d *Device) SetBandwidth(bw uint8) {
+	d.loraConf.Bw = bandwidth(bw)
+	d.WriteRegister(SX127X_REG_MODEM_CONFIG_1, (d.ReadRegister(SX127X_REG_MODEM_CONFIG_1)&0x0f)|(bw<<4))
+}
+
+// SetCodingRate updates the coding rate the LoRa module is using
+func (d *Device) SetCodingRate(cr uint8) {
+	d.loraConf.Cr = cr
+	d.WriteRegister(SX127X_REG_MODEM_CONFIG_1, (d.ReadRegister(SX127X_REG_MODEM_CONFIG_1)&0xf1)|(cr<<1))
+}
+
+// SetImplicitHeaderModeOn Enables implicit header mode ***
+func (d *Device) SetHeaderMode(headerType uint8) {
+	d.loraConf.HeaderType = headerType
+	if headerType == lora.HeaderImplicit {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_1, d.ReadRegister(SX127X_REG_MODEM_CONFIG_1)|0x01)
+	} else {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_1, d.ReadRegister(SX127X_REG_MODEM_CONFIG_1)&0xfe)
+	}
+}
+
+// SetSpreadingFactor changes spreading factor
+func (d *Device) SetSpreadingFactor(sf uint8) {
+	d.loraConf.Sf = sf
+	if sf == lora.SpreadingFactor6 {
+		d.WriteRegister(SX127X_REG_DETECTION_OPTIMIZE, 0xc5)
+		d.WriteRegister(SX127X_REG_DETECTION_THRESHOLD, 0x0c)
+	} else {
+		d.WriteRegister(SX127X_REG_DETECTION_OPTIMIZE, 0xc3)
+		d.WriteRegister(SX127X_REG_DETECTION_THRESHOLD, 0x0a)
+	}
+	var newValue = (d.ReadRegister(SX127X_REG_MODEM_CONFIG_2) & 0x0f) | ((sf << 4) & 0xf0)
+	d.WriteRegister(SX127X_REG_MODEM_CONFIG_2, newValue)
+}
+
+// SetTxContinuousMode enable Continuous Tx mode
+func (d *Device) SetTxContinuousMode(val bool) {
+	if val {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_2, d.ReadRegister(SX127X_REG_MODEM_CONFIG_2)|0x08)
+	} else {
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_2, d.ReadRegister(SX127X_REG_MODEM_CONFIG_2)&0xf7)
+	}
+}
+
+// SetCrc Enable CRC generation and check on payload
+func (d *Device) SetCrc(enable bool) {
+	if enable {
+		d.loraConf.Crc = lora.CRCOn
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_2, d.ReadRegister(SX127X_REG_MODEM_CONFIG_2)|0x04)
+	} else {
+		d.loraConf.Crc = lora.CRCOff
+		d.WriteRegister(SX127X_REG_MODEM_CONFIG_2, d.ReadRegister(SX127X_REG_MODEM_CONFIG_2)&0xfb)
+	}
+}
+
+func (d *Device) SetPreamble(pLen uint16) {
+	// Sets preamble length
+	d.WriteRegister(SX127X_REG_PREAMBLE_MSB, uint8((pLen>>8)&0xFF))
+	d.WriteRegister(SX127X_REG_PREAMBLE_LSB, uint8(pLen&0xFF))
+}
+
+// SetSyncWord defines sync word
+func (d *Device) SetSyncWord(syncWord uint16) {
+	d.loraConf.SyncWord = syncWord
+	sw := uint8(syncWord & 0xFF)
+	d.WriteRegister(SX127X_REG_SYNC_WORD, sw)
+}
+
+// SetIQMode Sets I/Q polarity configuration
+func (d *Device) SetIqMode(val uint8) {
+	d.loraConf.Iq = val
+	if val == lora.IQStandard {
+		//Set IQ to normal values
+		d.WriteRegister(SX127X_REG_INVERTIQ, 0x27)
+		d.WriteRegister(SX127X_REG_INVERTIQ2, 0x1D)
+	} else {
+		//Invert IQ Back
+		d.WriteRegister(SX127X_REG_INVERTIQ, 0x66)
+		d.WriteRegister(SX127X_REG_INVERTIQ2, 0x19)
+	}
+}
+
+// Tx sends a lora packet, (with timeout)
+func (d *Device) Tx(pkt []uint8, timeoutMs uint32) error {
+	d.SetOpModeLora()
+	d.SetOpMode(SX127X_OPMODE_SLEEP)
+
+	d.SetHopPeriod(0x00)
+	d.SetLowFrequencyModeOn(false)                                                      // High freq mode
+	d.WriteRegister(SX127X_REG_PA_RAMP, (d.ReadRegister(SX127X_REG_PA_RAMP)&0xF0)|0x08) // set PA ramp-up time 50 uSec
+	d.WriteRegister(SX127X_REG_LNA, SX127X_LNA_MAX_GAIN)                                // Set Low Noise Amplifier to MAX
+
+	d.SetFrequency(d.loraConf.Freq)
+	d.SetPreamble(d.loraConf.Preamble)
+	d.SetSyncWord(d.loraConf.SyncWord)
+	d.SetBandwidth(d.loraConf.Bw)
+	d.SetSpreadingFactor(d.loraConf.Sf)
+	d.SetIqMode(d.loraConf.Iq)
+	d.SetCodingRate(d.loraConf.Cr)
+	d.SetCrc(d.loraConf.Crc == lora.CRCOn)
+	d.SetTxPower(d.loraConf.LoraTxPowerDBm, true)
+	d.SetHeaderMode(d.loraConf.HeaderType)
+	d.SetAgcAuto(SX127X_AGC_AUTO_ON)
+
+	// set the IRQ mapping DIO0=TxDone DIO1=NOP DIO2=NOP
+	d.WriteRegister(SX127X_REG_DIO_MAPPING_1, SX127X_MAP_DIO0_LORA_TXDONE|SX127X_MAP_DIO1_LORA_NOP|SX127X_MAP_DIO2_LORA_NOP)
+	// Clear all radio IRQ Flags
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF)
+	// Mask all but TxDone
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS_MASK, ^SX127X_IRQ_LORA_TXDONE_MASK)
+
+	// initialize the payload size and address pointers
+	d.WriteRegister(SX127X_REG_PAYLOAD_LENGTH, uint8(len(pkt)))
+	d.WriteRegister(SX127X_REG_FIFO_TX_BASE_ADDR, 0)
+	d.WriteRegister(SX127X_REG_FIFO_ADDR_PTR, 0)
+
+	// FIFO OPs cannot take place in Sleep mode !!!
+	d.SetOpMode(SX127X_OPMODE_STANDBY)
+	time.Sleep(time.Millisecond)
+	// Copy payload to FIFO // TODO: Bulk
+	for i := 0; i < len(pkt); i++ {
+		d.WriteRegister(SX127X_REG_FIFO, pkt[i])
+	}
+
+	// Enable TX
+	d.SetOpMode(SX127X_OPMODE_TX)
+
+	msg := <-d.GetRadioEventChan()
+	if msg.EventType != lora.RadioEventTxDone {
+		return errors.New("Unexpected Radio Event while TX " + string(0x30+msg.EventType))
+	}
+	return nil
+}
+
+// Rx tries to receive a Lora packet (with timeout in milliseconds)
+func (d *Device) Rx(timeoutMs uint32) ([]uint8, error) {
+	if d.loraConf.Freq == 0 {
+		return nil, lora.ErrUndefinedLoraConf
+	}
+
+	d.SetOpModeLora()
+	d.SetOpMode(SX127X_OPMODE_SLEEP)
+
+	d.SetHopPeriod(0x00)
+	d.SetLowFrequencyModeOn(false)                                                      // High freq mode
+	d.WriteRegister(SX127X_REG_PA_RAMP, (d.ReadRegister(SX127X_REG_PA_RAMP)&0xF0)|0x08) // set PA ramp-up time 50 uSec
+	d.WriteRegister(SX127X_REG_LNA, SX127X_LNA_MAX_GAIN)                                // Set Low Noise Amplifier to MAX
+
+	d.SetFrequency(d.loraConf.Freq)
+	d.SetPreamble(d.loraConf.Preamble)
+	d.SetSyncWord(d.loraConf.SyncWord)
+	d.SetBandwidth(d.loraConf.Bw)
+	d.SetSpreadingFactor(d.loraConf.Sf)
+	d.SetIqMode(d.loraConf.Iq)
+	d.SetCodingRate(d.loraConf.Cr)
+	d.SetCrc(d.loraConf.Crc == lora.CRCOn)
+	d.SetTxPower(d.loraConf.LoraTxPowerDBm, true)
+	d.SetHeaderMode(d.loraConf.HeaderType)
+	d.SetAgcAuto(SX127X_AGC_AUTO_ON)
+
+	// set the IRQ mapping DIO0=RxDone DIO1=RxTimeout DIO2=NOP
+	d.WriteRegister(SX127X_REG_DIO_MAPPING_1, SX127X_MAP_DIO0_LORA_RXDONE|SX127X_MAP_DIO1_LORA_RXTOUT|SX127X_MAP_DIO2_LORA_NOP)
+	// Clear all radio IRQ Flags
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF)
+	// Mask all but RxDone
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS_MASK, ^(SX127X_IRQ_LORA_RXDONE_MASK | SX127X_IRQ_LORA_RXTOUT_MASK))
+	// Switch to RX Mode
+	d.SetOpMode(SX127X_OPMODE_RX_SINGLE) //
+	// Wait for Radio Event
+
+	radioCh := d.GetRadioEventChan()
+
+	msg := <-radioCh
+	if msg.EventType == lora.RadioEventTimeout {
+		return nil, nil
+	} else if msg.EventType != lora.RadioEventRxDone {
+		return nil, errors.New("Unexpected Radio Event while RX " + string(0x30+msg.EventType))
+	}
+
+	d.WriteRegister(SX127X_REG_FIFO_RX_BASE_ADDR, 0)
+	d.WriteRegister(SX127X_REG_FIFO_ADDR_PTR, 0)
+
+	pLen := d.ReadRegister(SX127X_REG_RX_NB_BYTES)
+	d.WriteRegister(SX127X_REG_FIFO_ADDR_PTR, d.ReadRegister(SX127X_REG_FIFO_RX_CURRENT_ADDR))
+
+	for i := uint8(0); i < pLen; i++ {
+		d.spiBuffer[i] = d.ReadRegister(SX127X_REG_FIFO)
+	}
+	return d.spiBuffer[:pLen], nil
+}
+
+//
+// HELPER FUNCTIONS
+//
+
+// PrintRegisters outputs the sx127x transceiver registers
+func (d *Device) PrintRegisters(compact bool) {
+	for i := uint8(0); i < 128; i++ {
+		v := d.ReadRegister(i)
+		print(v, " ")
+	}
+	println()
+}
+
+// PrintRegisters outputs the sx127x transceiver registers
+func (d *Device) RandomU32() uint32 {
+	// Disable ALL irqs
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF)
+	d.SetOpModeLora()
+	d.SetOpMode(SX127X_OPMODE_SLEEP)
+	d.SetFrequency(d.loraConf.Freq)
+	d.SetOpMode(SX127X_OPMODE_RX)
+	rnd := uint32(0)
+	for i := 0; i < 32; i++ {
+		time.Sleep(time.Millisecond * 10)
+		// Unfiltered RSSI value reading. Only takes the LSB value
+		rnd |= (uint32(d.ReadRegister(SX127X_REG_RSSI_WIDEBAND)) & 0x01) << i
+	}
+	return rnd
+}
+
+// HandleInterrupt must be called by main code on DIO state change.
+func (d *Device) HandleInterrupt() {
+	// Get IRQ and clear
+	st := d.ReadRegister(SX127X_REG_IRQ_FLAGS)
+	d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF)
+
+	rChan := d.GetRadioEventChan()
+
+	if (st & SX127X_IRQ_LORA_RXDONE_MASK) > 0 {
+		rChan <- lora.NewRadioEvent(lora.RadioEventRxDone, uint16(st), nil)
+	}
+
+	if (st & SX127X_IRQ_LORA_TXDONE_MASK) > 0 {
+		rChan <- lora.NewRadioEvent(lora.RadioEventTxDone, uint16(st), nil)
+	}
+
+	if (st & SX127X_IRQ_LORA_RXTOUT_MASK) > 0 {
+		rChan <- lora.NewRadioEvent(lora.RadioEventTimeout, uint16(st), nil)
+	}
+
+	if (st & SX127X_IRQ_LORA_CRCERR_MASK) > 0 {
+		rChan <- lora.NewRadioEvent(lora.RadioEventCrcError, uint16(st), nil)
+	}
+}
+
+func bandwidth(bw uint8) uint8 {
+	switch bw {
+	case lora.Bandwidth_7_8:
+		return SX127X_LORA_BW_7_8
+	case lora.Bandwidth_10_4:
+		return SX127X_LORA_BW_10_4
+	case lora.Bandwidth_15_6:
+		return SX127X_LORA_BW_15_6
+	case lora.Bandwidth_20_8:
+		return SX127X_LORA_BW_20_8
+	case lora.Bandwidth_31_25:
+		return SX127X_LORA_BW_31_25
+	case lora.Bandwidth_41_7:
+		return SX127X_LORA_BW_41_7
+	case lora.Bandwidth_62_5:
+		return SX127X_LORA_BW_62_5
+	case lora.Bandwidth_125_0:
+		return SX127X_LORA_BW_125_0
+	case lora.Bandwidth_250_0:
+		return SX127X_LORA_BW_250_0
+	case lora.Bandwidth_500_0:
+		return SX127X_LORA_BW_500_0
+	default:
+		return 0
+	}
+}
+
+func syncword(sw int) uint16 {
+	if sw == lora.SyncPublic {
+		return SX127X_LORA_MAC_PUBLIC_SYNCWORD
+	}
+	return SX127X_LORA_MAC_PRIVATE_SYNCWORD
+}