examples: lora atcmd compiled for simulator, sx126x, and sx127x

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

examples/lora/atcmd/sx126x.go

@@ -2,7 +2,64 @@
 
 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
+
+var (
+	loraRadio *sx126x.Device
+)
+
 // do sx126x setup here
 func setupLora() (LoraRadio, error) {
-	return nil, nil	
+	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"
 }