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sx127x: fix RX timeout

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This commit is contained in:
Olivier Fauchon
2023-01-30 23:32:05 +01:00
parent c78aa53820
commit e74b01f973
1 changed files with 14 additions and 3 deletions
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sx127x/sx127x.go
+14 -3
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@@ -434,18 +434,28 @@ func (d *Device) Rx(timeoutMs uint32) ([]uint8, error) {
d.SetHeaderType(d.loraConf.HeaderType) d.SetHeaderType(d.loraConf.HeaderType)
d.SetAgcAuto(SX127X_AGC_AUTO_ON) d.SetAgcAuto(SX127X_AGC_AUTO_ON)
//d.SetRxTimeout(200)
// set the IRQ mapping DIO0=RxDone DIO1=RxTimeout DIO2=NOP // set the IRQ mapping DIO0=RxDone DIO1=RxTimeout DIO2=NOP
d.WriteRegister(SX127X_REG_DIO_MAPPING_1, SX127X_MAP_DIO0_LORA_RXDONE|SX127X_MAP_DIO1_LORA_RXTOUT|SX127X_MAP_DIO2_LORA_NOP) d.WriteRegister(SX127X_REG_DIO_MAPPING_1, SX127X_MAP_DIO0_LORA_RXDONE|SX127X_MAP_DIO1_LORA_RXTOUT|SX127X_MAP_DIO2_LORA_NOP)
// Clear all radio IRQ Flags // Clear all radio IRQ Flags
d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF) d.WriteRegister(SX127X_REG_IRQ_FLAGS, 0xFF)
// Mask all but RxDone // Mask all but RxDone
d.WriteRegister(SX127X_REG_IRQ_FLAGS_MASK, ^(SX127X_IRQ_LORA_RXDONE_MASK | SX127X_IRQ_LORA_RXTOUT_MASK)) d.WriteRegister(SX127X_REG_IRQ_FLAGS_MASK, ^(SX127X_IRQ_LORA_RXDONE_MASK | SX127X_IRQ_LORA_RXTOUT_MASK))
// Switch to RX Mode
d.SetOpMode(SX127X_OPMODE_RX_SINGLE) //
// Wait for Radio Event
// Get Radio Event Channel
radioCh := d.GetRadioEventChan() radioCh := d.GetRadioEventChan()
// Single RX mode don't properly handle Timeouts on sx127x, so we use Continuous RX
// Go routine is a workaround to stop the Continuous RX and fire a timeout Event
d.SetOpMode(SX127X_OPMODE_RX)
go func() {
time.Sleep(time.Millisecond * time.Duration(timeoutMs))
d.SetOpMode(SX127X_OPMODE_STANDBY) //Go standby
radioCh <- lora.NewRadioEvent(lora.RadioEventTimeout, 0, nil)
}()
// Now the channel can receive either a Timeout or a RxDone:
msg := <-radioCh msg := <-radioCh
if msg.EventType == lora.RadioEventTimeout { if msg.EventType == lora.RadioEventTimeout {
return nil, nil return nil, nil
@@ -453,6 +463,7 @@ func (d *Device) Rx(timeoutMs uint32) ([]uint8, error) {
return nil, errors.New("Unexpected Radio Event while RX " + string(0x30+msg.EventType)) return nil, errors.New("Unexpected Radio Event while RX " + string(0x30+msg.EventType))
} }
// Get the received payload
d.WriteRegister(SX127X_REG_FIFO_RX_BASE_ADDR, 0) d.WriteRegister(SX127X_REG_FIFO_RX_BASE_ADDR, 0)
d.WriteRegister(SX127X_REG_FIFO_ADDR_PTR, 0) d.WriteRegister(SX127X_REG_FIFO_ADDR_PTR, 0)