sx126x: Driver for Semtech sx126x radio modules and optional RF Switch.

This first version of the driver has been tested with STM32WL SoC,
	which embeddeds SX1262 radio on the same die.

examples/sx126x/lora_rxtx/lora_rxtx.go

@@ -0,0 +1,98 @@
+package main
+
+// In this example, a Lora packet will be sent every 10s
+// module will be in RX mode between two transmissions
+
+import (
+	"device/stm32"
+	"machine"
+	"runtime/interrupt"
+	"time"
+
+	rfswitch "tinygo.org/x/drivers/examples/sx126x/rfswitch"
+
+	"tinygo.org/x/drivers/sx126x"
+)
+
+const FREQ = 868100000
+
+const (
+	LORA_DEFAULT_RXTIMEOUT_MS = 1000
+	LORA_DEFAULT_TXTIMEOUT_MS = 5000
+)
+
+var (
+	loraRadio *sx126x.Device
+	txmsg     = []byte("Hello TinyGO")
+)
+
+// radioIntHandler will take care of radio interrupts
+func radioIntHandler(intr interrupt.Interrupt) {
+	loraRadio.HandleInterrupt()
+}
+
+func main() {
+	println("\n# TinyGo Lora RX/TX test")
+	println("# ----------------------")
+	machine.LED.Configure(machine.PinConfig{Mode: machine.PinOutput})
+
+	// Create the driver
+	loraRadio = sx126x.New(machine.SPI3)
+	loraRadio.SetDeviceType(sx126x.DEVICE_TYPE_SX1262)
+
+	// Create RF Switch
+	var radioSwitch rfswitch.CustomSwitch
+	loraRadio.SetRfSwitch(radioSwitch)
+
+	// Detect the device
+	state := loraRadio.DetectDevice()
+	if !state {
+		panic("sx126x not detected.")
+	}
+
+	// Add interrupt handler for Radio IRQs
+	intr := interrupt.New(stm32.IRQ_Radio_IRQ_Busy, radioIntHandler)
+	intr.Enable()
+
+	loraConf := sx126x.LoraConfig{
+		Freq:           FREQ,
+		Bw:             sx126x.SX126X_LORA_BW_500_0,
+		Sf:             sx126x.SX126X_LORA_SF9,
+		Cr:             sx126x.SX126X_LORA_CR_4_7,
+		HeaderType:     sx126x.SX126X_LORA_HEADER_EXPLICIT,
+		Preamble:       12,
+		Ldr:            sx126x.SX126X_LORA_LOW_DATA_RATE_OPTIMIZE_OFF,
+		Iq:             sx126x.SX126X_LORA_IQ_STANDARD,
+		Crc:            sx126x.SX126X_LORA_CRC_ON,
+		SyncWord:       sx126x.SX126X_LORA_MAC_PRIVATE_SYNCWORD,
+		LoraTxPowerDBm: 20,
+	}
+
+	loraRadio.LoraConfig(loraConf)
+
+	var count uint
+	for {
+		tStart := time.Now()
+
+		// Blocking RX for LORA_DEFAULT_RXTIMEOUT_MS
+		println("Start Lora RX for 10 sec")
+		for int(time.Now().Sub(tStart).Seconds()) < 10 {
+			buf, err := loraRadio.LoraRx(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("LORA TX size=", len(txmsg))
+		err := loraRadio.LoraTx(txmsg, LORA_DEFAULT_TXTIMEOUT_MS)
+		if err != nil {
+			println("TX Error:", err)
+		}
+		count++
+	}
+
+}