basic sx128x example for lilygo t3s3

2026-04-22 12:16:29 -05:00
parent e989c38eba
commit 876bafaa7c
3 changed files with 301 additions and 0 deletions
@@ -0,0 +1,12 @@
+module lilygot3s3
+
+go 1.26.2
+
+require (
+	github.com/jwetzell/osc-go v0.3.0
+	tinygo.org/x/drivers v0.35.0
+)
+
+require github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
+
+replace tinygo.org/x/drivers => /Users/jwetzell/Projects/drivers
@@ -0,0 +1,4 @@
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 h1:El6M4kTTCOh6aBiKaUGG7oYTSPP8MxqL4YI3kZKwcP4=
+github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510/go.mod h1:pupxD2MaaD3pAXIBCelhxNneeOaAeabZDe5s4K6zSpQ=
+github.com/jwetzell/osc-go v0.3.0 h1:z75TxuQSEmdcmZ56OAepkDa3m88SdZh//3m4nBb/XZI=
+github.com/jwetzell/osc-go v0.3.0/go.mod h1:kCs329JxY6Qjga08tRQ/Gl0PqhgQzLIMpOhm6uszvIc=
@@ -0,0 +1,285 @@
+package main
+
+import (
+	"errors"
+	"machine"
+	"sync/atomic"
+	"time"
+
+	"github.com/jwetzell/osc-go"
+	"tinygo.org/x/drivers/lora"
+	"tinygo.org/x/drivers/sx128x"
+)
+
+func main() {
+	time.Sleep(3 * time.Second)
+
+	led := machine.GPIO37
+	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
+
+	spi := machine.SPI0
+	spi.Configure(machine.SPIConfig{
+		Mode:      0,
+		Frequency: 8 * 1e6,
+		SDO:       machine.GPIO6,
+		SDI:       machine.GPIO3,
+		SCK:       machine.GPIO5,
+	})
+
+	nssPin := machine.GPIO7
+	nssPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	nssPin.Set(true)
+
+	resetPin := machine.GPIO8
+	resetPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	resetPin.Set(true)
+
+	busyPin := machine.GPIO36
+	busyPin.Configure(machine.PinConfig{Mode: machine.PinInput})
+
+	button := machine.GPIO0
+	button.Configure(machine.PinConfig{Mode: machine.PinInput})
+	buttonPressed := atomic.Bool{}
+	buttonPressed.Store(false)
+	button.SetInterrupt(machine.PinFalling, func(machine.Pin) {
+		println("button interrupt")
+		buttonPressed.Store(true)
+	})
+
+	println("initializing radio...")
+
+	radio := sx128x.New(
+		spi,
+		nssPin,
+		resetPin,
+		busyPin,
+	)
+
+	dio1Pin := machine.GPIO9
+	dio1Pin.Configure(machine.PinConfig{Mode: machine.PinInput})
+
+	txDone := atomic.Bool{}
+	txDone.Store(true)
+	rxDone := atomic.Bool{}
+	rxDone.Store(true)
+	timeout := atomic.Bool{}
+	timeout.Store(true)
+
+	dio1Pin.SetInterrupt(machine.PinRising, func(machine.Pin) {
+		irqStatus := radio.GetIrqStatus()
+
+		if irqStatus&sx128x.IRQ_TX_DONE_MASK != 0 {
+			txDone.Store(true)
+			timeout.Store(false)
+			led.Set(false)
+		}
+		if irqStatus&sx128x.IRQ_RX_DONE_MASK != 0 {
+			rxDone.Store(true)
+			timeout.Store(false)
+			led.Set(true)
+		}
+		if irqStatus&sx128x.IRQ_RX_TX_TIMEOUT_MASK != 0 {
+			timeout.Store(true)
+			txDone.Store(true)
+			rxDone.Store(true)
+		}
+	})
+
+	loraConfig := lora.Config{
+		Freq:           2400000000,
+		Bw:             lora.Bandwidth_1625_0,
+		Sf:             lora.SpreadingFactor9,
+		Cr:             lora.CodingRate4_7,
+		HeaderType:     sx128x.LORA_EXPLICIT_HEADER,
+		Preamble:       12,
+		Ldr:            lora.LowDataRateOptimizeOff,
+		Iq:             sx128x.LORA_IQ_STD,
+		Crc:            sx128x.LORA_CRC_DISABLE,
+		SyncWord:       0x1424,
+		LoraTxPowerDBm: 13,
+	}
+
+	radio.WaitWhileBusy()
+	SetupLora(radio, loraConfig)
+
+	oscMessage := osc.OSCMessage{
+		Address: "/lora/button",
+		Args: []osc.OSCArg{
+			{
+				Type:  "i",
+				Value: 0,
+			},
+		},
+	}
+
+	for {
+		if txDone.Load() && buttonPressed.Load() {
+			txDone.Store(false)
+			buttonPressed.Store(false)
+			radio.ClearIrqStatus(sx128x.IRQ_ALL_MASK)
+			radio.SetStandby(sx128x.STANDBY_RC)
+			led.Set(true)
+
+			oscMessage.Args[0].Value = int32(time.Now().UnixMilli() / 1000)
+			bytes, err := oscMessage.ToBytes()
+			if err != nil {
+				println("failed to serialize OSC message:", err)
+				continue
+			}
+			if len(bytes) > 255 {
+				println("OSC message exceeds maximum length of 255 bytes")
+				continue
+			}
+
+			err = Tx(radio, loraConfig, bytes)
+			if err != nil {
+				println("failed to enter transmit:", err)
+			}
+			println("transmit started")
+		}
+
+		// if rxDone.Load() {
+		// 	rxDone.Store(false)
+		// 	if !timeout.Load() {
+		// 		rxLength, rxPointer := radio.GetRxBufferStatus()
+		// 		rxData := radio.ReadBuffer(rxPointer, rxLength)
+		// 		oscMessage, err := osc.MessageFromBytes(rxData)
+		// 		if err != nil {
+		// 			println("failed to parse OSC message:", err)
+		// 		} else {
+		// 			println("received OSC message with address:", oscMessage.Address)
+		// 			for i, arg := range oscMessage.Args {
+		// 				println("arg", i, "type:", arg.Type, "value:", arg.Value)
+		// 			}
+		// 		}
+
+		// 		led.Set(false)
+		// 	}
+		// 	Rx(radio, loraConfig)
+		// }
+	}
+}
+
+func SetupLora(radio *sx128x.Device, config lora.Config) {
+	// Switch to standby prior to configuration changes
+
+	circuitMode, _ := radio.GetStatus()
+	if circuitMode != sx128x.CIRCUIT_MODE_STDBY_RC {
+		radio.SetStandby(sx128x.STANDBY_RC)
+	}
+	// Clear errors, disable radio interrupts for the moment
+	radio.SetPacketType(sx128x.PACKET_TYPE_LORA)
+	radio.SetCadParams(sx128x.LORA_CAD_08_SYMBOLS)
+	radio.SetRegulatorMode(sx128x.REGULATOR_DC_DC)
+
+	radio.SetRfFrequency(config.Freq)
+	radio.SetModulationParams(spreadingFactor(config.Sf), bandwidth(config.Bw), codingRate(config.Cr))
+
+	data := [1]uint8{}
+	if config.Sf == lora.SpreadingFactor5 || config.Sf == lora.SpreadingFactor6 {
+		data[0] = 0x1E
+	} else if config.Sf == lora.SpreadingFactor7 || config.Sf == lora.SpreadingFactor8 {
+		data[0] = 0x37
+	} else {
+		data[0] = 0x32
+	}
+	radio.WriteRegister(0x925, data[:])
+	existing := radio.ReadRegister(0x93C)
+	data[0] = existing | 0x01
+	radio.WriteRegister(0x93C, data[:])
+
+	radio.SetTxParams(config.LoraTxPowerDBm, sx128x.RADIO_RAMP_02_US)
+	radio.SetPacketParamsLoRa(uint32(config.Preamble), config.HeaderType, 0xFF, config.Crc, config.Iq)
+	var syncWord [2]uint8
+	syncWord[0] = uint8(config.SyncWord >> 8)
+	syncWord[1] = uint8(config.SyncWord & 0x00FF)
+
+	radio.WriteRegister(sx128x.REG_LORA_SYNC_WORD_MSB, syncWord[:])
+
+}
+
+func checkStatus(radio *sx128x.Device, operation string) {
+	circuitMode, commandStatus := radio.GetStatus()
+	if commandStatus != sx128x.COMMAND_STATUS_SUCCESS {
+		println(operation, "-> failed with status:", commandStatus)
+	}
+	if circuitMode != sx128x.CIRCUIT_MODE_STDBY_RC {
+		println(operation, "-> entered circuit mode:", circuitMode)
+	}
+}
+
+func Tx(radio *sx128x.Device, loraConfig lora.Config, data []byte) error {
+	if len(data) > 255 {
+		return errors.New("data length exceeds maximum of 255 bytes")
+	}
+	radio.SetStandby(sx128x.STANDBY_RC)
+	radio.SetPacketParamsLoRa(uint32(loraConfig.Preamble), loraConfig.HeaderType, uint8(len(data)&0xFF), loraConfig.Crc, loraConfig.Iq)
+	radio.SetBufferBaseAddress(0, 0)
+	radio.WriteBuffer(0, data)
+	radio.SetDioIrqParams(sx128x.IRQ_TX_DONE_MASK|sx128x.IRQ_RX_TX_TIMEOUT_MASK, sx128x.IRQ_TX_DONE_MASK|sx128x.IRQ_RX_TX_TIMEOUT_MASK, 0x00, 0x00)
+	radio.ClearIrqStatus(sx128x.IRQ_ALL_MASK)
+	radio.SetTx(sx128x.PERIOD_BASE_4_MS, 250)
+	return nil
+}
+
+func Rx(radio *sx128x.Device, loraConfig lora.Config) {
+	radio.SetStandby(sx128x.STANDBY_RC)
+	radio.SetDioIrqParams(sx128x.IRQ_RX_DONE_MASK|sx128x.IRQ_RX_TX_TIMEOUT_MASK, sx128x.IRQ_RX_DONE_MASK|sx128x.IRQ_RX_TX_TIMEOUT_MASK, 0x00, 0x00)
+	radio.SetBufferBaseAddress(0, 0)
+	radio.ClearIrqStatus(sx128x.IRQ_ALL_MASK)
+	radio.SetRfFrequency(loraConfig.Freq)
+	radio.SetRx(sx128x.PERIOD_BASE_4_MS, 250)
+}
+
+func codingRate(cr uint8) uint8 {
+	switch cr {
+	case lora.CodingRate4_5:
+		return sx128x.LORA_CR_4_5
+	case lora.CodingRate4_6:
+		return sx128x.LORA_CR_4_6
+	case lora.CodingRate4_7:
+		return sx128x.LORA_CR_4_7
+	case lora.CodingRate4_8:
+		return sx128x.LORA_CR_4_8
+	default:
+		return 0
+	}
+}
+
+func spreadingFactor(sf uint8) uint8 {
+	switch sf {
+	case lora.SpreadingFactor5:
+		return sx128x.LORA_SF_5
+	case lora.SpreadingFactor6:
+		return sx128x.LORA_SF_6
+	case lora.SpreadingFactor7:
+		return sx128x.LORA_SF_7
+	case lora.SpreadingFactor8:
+		return sx128x.LORA_SF_8
+	case lora.SpreadingFactor9:
+		return sx128x.LORA_SF_9
+	case lora.SpreadingFactor10:
+		return sx128x.LORA_SF_10
+	case lora.SpreadingFactor11:
+		return sx128x.LORA_SF_11
+	case lora.SpreadingFactor12:
+		return sx128x.LORA_SF_12
+	default:
+		return 0
+	}
+}
+
+func bandwidth(bw uint8) uint8 {
+	switch bw {
+	case lora.Bandwidth_1625_0:
+		return sx128x.LORA_BW_1600
+	case lora.Bandwidth_812_5:
+		return sx128x.LORA_BW_800
+	case lora.Bandwidth_406_25:
+		return sx128x.LORA_BW_400
+	case lora.Bandwidth_203_125:
+		return sx128x.LORA_BW_200
+	default:
+		return 0
+	}
+}