private void Dio0Pin_ValueChanged(GpioPin sender, GpioPinValueChangedEventArgs args)
{
if (args.Edge != GpioPinEdge.RisingEdge)
{
return;
}
LoraRegisterIrqFlags.FlagsEnum irqFlags = RegisterManager.Read <LoraRegisterIrqFlags>().Flags;
if (irqFlags.HasFlag(LoraRegisterIrqFlags.FlagsEnum.TxDone))
{
TransmittedOkCount++;
_transmissionCompletedEventSlim.Set();
}
if (irqFlags.HasFlag(LoraRegisterIrqFlags.FlagsEnum.RxDone))
{
ReceivedMessage message = GetReceivedMessage();
OnMessageReceived?.Invoke(this, new ReceivedMessageEventArgs(message));
}
// Clear all IRQ flags
RegisterManager.Write(new LoraRegisterIrqFlags(0xFF));
}
private ReceivedMessage GetReceivedMessage()
{
DateTime timestamp = DateTime.UtcNow;
LoraRegisterIrqFlags.FlagsEnum irqFlags = RegisterManager.Read <LoraRegisterIrqFlags>().Flags;
bool timeout;
if (irqFlags.HasFlag(LoraRegisterIrqFlags.FlagsEnum.RxTimeout))
{
timeout = true;
ReceivedTimeoutCount++;
}
else
{
timeout = false;
}
bool crcOk;
if (irqFlags.HasFlag(LoraRegisterIrqFlags.FlagsEnum.PayloadCrcError))
{
crcOk = false;
ReceivedBadCrcCount++;
}
else
{
crcOk = true;
}
if (!timeout && crcOk)
{
ReceivedOkCount++;
}
lock (_registerFifoLock)
{
// Get the FIFO-address of the last received packet
byte currentFifoAddr = RegisterManager.Read <LoraRegisterFifoRxCurrentAddr>().Addr;
// Go to that address
RegisterManager.Write(new LoraRegisterFifoAddrPtr(currentFifoAddr));
// Get the number of received bytes
byte receivedCount = RegisterManager.Read <LoraRegisterRxNbBytes>().FifoRxBytesNb;
// Prepare a buffer to copy to from the FIFO queue
var buffer = new byte[receivedCount];
// Copy from the FIFO queue
for (int i = 0; i < receivedCount; i++)
{
buffer[i] = RegisterManager.Read <CommonRegisterFifo>().Value;
}
// Get the RSSI correction value
int rssiCorrection = GetRssiCorrection();
// Get the adjusted RSSI value
int rssi = RegisterManager.Read <LoraRegisterRssiValue>().Rssi + rssiCorrection;
// Get the adjusted RSSI value of the packet
int pktRssi = RegisterManager.Read <LoraRegisterPktRssiValue>().PacketRssi + rssiCorrection;
// Get the packet signal-to-noise ratio
float pktSnr = (float)Math.Round(RegisterManager.Read <LoraRegisterPktSnrValue>().PacketSnr / 4d, 1);
#if DEBUG
Debug.WriteLine($"Packet RSSI: {pktRssi}, RSSI: {rssi}, SNR: {pktSnr}, Length: {buffer.Length}");
#endif
return(new ReceivedMessage(buffer, rssi, pktRssi, pktSnr, crcOk, timeout, timestamp));
}
}