sx126x: refactor to RadioController interface to more easily handle non-STM32WL boards and remove duplicated code

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

examples/lora/lorawan/common/stm32wlx.go

@@ -0,0 +1,65 @@
+//go:build stm32wlx
+
+package common
+
+import (
+	"machine"
+
+	"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
+)
+
+var spi = machine.SPI3
+
+func newRadioControl() sx126x.RadioController {
+	return sx126x.NewRadioControl()
+}
+
+// do sx126x setup here
+func SetupLora() (lora.Radio, error) {
+	loraRadio = sx126x.New(spi)
+	loraRadio.SetDeviceType(sx126x.DEVICE_TYPE_SX1262)
+
+	// Create radio controller for target
+	loraRadio.SetRadioController(newRadioControl())
+
+	if state := loraRadio.DetectDevice(); !state {
+		return nil, errRadioNotFound
+	}
+
+	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
+}
+
+func FirmwareVersion() string {
+	return "sx126x"
+}
+
+func Lorarx() ([]byte, error) {
+	return loraRadio.Rx(LORA_DEFAULT_RXTIMEOUT_MS)
+}