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sx127x: add functions used for FSK radio communication #823

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sx127x: add functions used for FSK radio communication #823

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6 changes: 6 additions & 0 deletions sx127x/registers.go
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,12 @@ const (
SX127X_OPMODE_RX_SINGLE = uint8(0x06)
SX127X_OPMODE_CAD = uint8(0x07)

SX127X_OPMODE_MODULATION_Pos = uint8(0x5)
SX127X_OPMODE_LOW_FREQUENCY_Pos = uint8(0x3)

SX127X_OPMODE_MODULATION_FSK = 0x0
SX127X_OPMODE_MODULATION_OOK = 0x1

SX127X_LORA_MAC_PUBLIC_SYNCWORD = 0x34
SX127X_LORA_MAC_PRIVATE_SYNCWORD = 0x14
)
48 changes: 37 additions & 11 deletions sx127x/sx127x.go
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Original file line number Diff line number Diff line change
Expand Up @@ -25,9 +25,9 @@ type Device struct {
rstPin machine.Pin // GPIO for reset
radioEventChan chan lora.RadioEvent // Channel for Receiving events
loraConf lora.Config // Current Lora configuration
controller RadioController // to manage interactions with the radio
controller RadioController // to manage interrupts with the radio
deepSleep bool // Internal Sleep state
deviceType int // sx1261,sx1262,sx1268 (defaults sx1261)
deviceType int // sx1272, sx1273, sx1276, sx1279 (defaults sx1276)
spiTxBuf []byte // global Tx buffer to avoid heap allocations in interrupt
spiRxBuf []byte // global Rx buffer to avoid heap allocations in interrupt
}
Expand Down Expand Up @@ -81,23 +81,31 @@ func (d *Device) DetectDevice() bool {

// ReadRegister reads register value
func (d *Device) ReadRegister(reg uint8) uint8 {
d.controller.SetNss(false)
if d.controller != nil {
d.controller.SetNss(false)
}

// Send register
//d.spiTxBuf = []byte{reg & 0x7f}
d.spiTxBuf = d.spiTxBuf[:0]
d.spiTxBuf = append(d.spiTxBuf, byte(reg&0x7f))
d.spi.Tx(d.spiTxBuf, nil)
// Read value
d.spiRxBuf = d.spiRxBuf[:0]
d.spiRxBuf = append(d.spiRxBuf, 0)
d.spi.Tx(nil, d.spiRxBuf)
d.controller.SetNss(true)
if d.controller != nil {
d.controller.SetNss(true)
}

return d.spiRxBuf[0]
}

// WriteRegister writes value to register
func (d *Device) WriteRegister(reg uint8, value uint8) uint8 {
d.controller.SetNss(false)
if d.controller != nil {
d.controller.SetNss(false)
}

// Send register
d.spiTxBuf = d.spiTxBuf[:0]
d.spiTxBuf = append(d.spiTxBuf, byte(reg|0x80))
Expand All @@ -108,7 +116,10 @@ func (d *Device) WriteRegister(reg uint8, value uint8) uint8 {
d.spiRxBuf = d.spiRxBuf[:0]
d.spiRxBuf = append(d.spiRxBuf, 0)
d.spi.Tx(d.spiTxBuf, d.spiRxBuf)
d.controller.SetNss(true)
if d.controller != nil {
d.controller.SetNss(true)
}

return d.spiRxBuf[0]
}

Expand All @@ -119,9 +130,24 @@ func (d *Device) SetOpMode(mode uint8) {
d.WriteRegister(SX127X_REG_OP_MODE, new)
}

// SetOpMode changes the sx1276 mode
// SetOpModeLora changes the sx1276 mode to lora.
func (d *Device) SetOpModeLora() {
d.WriteRegister(SX127X_REG_OP_MODE, SX127X_OPMODE_LORA)
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)|SX127X_OPMODE_LORA)
}

// SetOpModeFsk changes the sx1276 mode to fsk/ook.
func (d *Device) SetOpModeFsk() {
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)&^SX127X_OPMODE_LORA)
}

// SetModulationType changes the modulation type (0=FSK, 1=OOK)
func (d *Device) SetModulationType(typ uint8) {
switch typ {
case SX127X_OPMODE_MODULATION_FSK:
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)&^(1<<SX127X_OPMODE_MODULATION_Pos))
case SX127X_OPMODE_MODULATION_OOK:
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)|(1<<SX127X_OPMODE_MODULATION_Pos))
}
}

// GetVersion returns hardware version of sx1276 chipset
Expand Down Expand Up @@ -244,9 +270,9 @@ func (d *Device) SetLowDataRateOptim(val uint8) {
// SetLowFrequencyModeOn enables Low Data Rate Optimization
func (d *Device) SetLowFrequencyModeOn(val bool) {
if val {
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)|0x04)
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)|(1<<SX127X_OPMODE_LOW_FREQUENCY_Pos))
} else {
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)&0xfb)
d.WriteRegister(SX127X_REG_OP_MODE, d.ReadRegister(SX127X_REG_OP_MODE)&^(1<<SX127X_OPMODE_LOW_FREQUENCY_Pos))
}
}

Expand Down