sx127x: Driver for Semtech sx127x radio modules

This first version of the driver has been tested with BB-FRM9x module
2026-08-15 04:13:40 +00:00 · 2021-01-19 00:35:45 +01:00
parent 877342d0ff
commit 67d2af5d45
6 changed files with 1158 additions and 0 deletions
@@ -0,0 +1,124 @@
+package main
+
+// This example code enable continuous Wave/Preamble
+
+import (
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/sx127x"
+)
+
+const (
+	FREQ = 868100000
+)
+
+var (
+	loraRadio *sx127x.Device
+
+	// We assume the module is connected this way:
+	SX127X_PIN_RST  = machine.PB9
+	SX127X_PIN_CS   = machine.PB8
+	SX127X_PIN_DIO0 = machine.PA0
+	SX127X_SPI      = machine.SPI0
+)
+
+func main() {
+	println("\n# TinyGo Lora continuous Wave/Preamble test")
+	println("# -----------------------------------------")
+
+	machine.LED.Configure(machine.PinConfig{Mode: machine.PinOutput})
+
+	// SPI, RESET, CS configuration
+	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.PinInputPulldown}) // Checkthat
+	SX127X_SPI.Configure(machine.SPIConfig{Frequency: 500000, Mode: 0})
+
+	// Create the driver
+	loraRadio = sx127x.New(SX127X_SPI, SX127X_PIN_CS, SX127X_PIN_RST)
+
+	err := SX127X_PIN_DIO0.SetInterrupt(machine.PinRising, func(machine.Pin) {
+		loraRadio.HandleInterrupt()
+	})
+	if err != nil {
+		panic("Can't configure DIO int handler")
+	}
+
+	// Reset the radio module
+	loraRadio.Reset()
+
+	println("Try to detect sx127x radio")
+	state := loraRadio.DetectDevice()
+	if !state {
+		panic("sx127x not detected. ")
+	} else {
+		println("sx127x detected")
+	}
+
+	/*
+		// Prepare for Lora operation
+			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: 14,
+			}
+			loraRadio.LoraConfig(loraConf)
+	*/
+
+	println("Start Configure Lora")
+	loraRadio.SetOpModeLora()
+	loraRadio.SetOpMode(sx127x.SX127X_OPMODE_SLEEP)
+	loraRadio.SetTxPower(11, true)
+	loraRadio.SetFrequency(FREQ)
+	loraRadio.SetBandwidth(sx127x.SX127X_LORA_BW_125_0)
+	loraRadio.SetCodingRate(sx127x.SX127X_LORA_CR_4_5)
+	loraRadio.SetRxPayloadCrc(sx127x.SX127X_LORA_CRC_ON)
+	loraRadio.SetHeaderMode(sx127x.SX127X_LORA_HEADER_EXPLICIT)
+	loraRadio.SetLowDataRateOptim(sx127x.SX127X_LOW_DATARATE_OPTIM_OFF)
+	println("End Configure Lora")
+
+	for {
+		loraRadio.TxLora([]byte("Hello"))
+		machine.LED.Set(!machine.LED.Get())
+		time.Sleep(time.Second * 2)
+	}
+	/*
+
+
+		// Although LoraConfig has already configured most of Lora settings,
+		// the following lines are still required to enable Continuous Preamble/Wave
+		loraRadio.SetPacketType(sx126x.SX126X_PACKET_TYPE_LORA)
+		loraRadio.SetRfFrequency(loraConf.Freq)
+		loraRadio.SetModulationParams(loraConf.Sf, loraConf.Bw, loraConf.Cr, loraConf.Ldr)
+		loraRadio.SetTxParams(loraConf.LoraTxPowerDBm, sx126x.SX126X_PA_RAMP_200U)
+
+		for {
+			println("2 seconds in Continuous Preamble")
+			loraRadio.SetStandby()
+			loraRadio.SetTxContinuousPreamble()
+			time.Sleep(2 * time.Second)
+			println("Continuous Preamble Stopped")
+
+			loraRadio.SetStandby()
+			time.Sleep(10 * time.Second)
+
+			println("2 seconds in Continuous Wave")
+			loraRadio.SetTxContinuousWave()
+			time.Sleep(2 * time.Second)
+			println(" Continuous Wave Stopped")
+
+			loraRadio.SetStandby()
+			time.Sleep(60 * time.Second)
+
+		}
+	*/
+}