Transmit and Receive with Interrupts

For the final revision of the “nasty” test harness I ensured interrupts were working for the simultaneous transmission and reception of messages. It’s not quite simultaneous, the code sends a message every 10 seconds then goes back to receive continuous mode after each message has been sent.

private void InterruptGpioPin_ValueChanged(GpioPin sender, GpioPinValueChangedEventArgs e)
{
   if (e.Edge != GpioPinEdge.RisingEdge)
   {
      return;
   }

   byte irqFlags = this.RegisterReadByte(0x12); // RegIrqFlags
   Debug.WriteLine($"RegIrqFlags 0X{irqFlags:x2}");

   if ((irqFlags & 0b01000000) == 0b01000000)  // RxDone 
   {
      Debug.WriteLine("Receive-Message");
      byte currentFifoAddress = this.RegisterReadByte(0x10); // RegFifiRxCurrent
      this.RegisterWriteByte(0x0d, currentFifoAddress); // RegFifoAddrPtr

      byte numberOfBytes = this.RegisterReadByte(0x13); // RegRxNbBytes

      // Allocate buffer for message
      byte[] messageBytes = this.RegisterRead(0X0, numberOfBytes);

      string messageText = UTF8Encoding.UTF8.GetString(messageBytes);
      Debug.WriteLine($"Received {messageBytes.Length} byte message {messageText}");
   }

  if ((irqFlags & 0b00001000) == 0b00001000)  // TxDone
  {
      this.RegisterWriteByte(0x01, 0b10000101); // RegOpMode set LoRa & RxContinuous
      Debug.WriteLine("Transmit-Done");
  }

   this.RegisterWriteByte(0x40, 0b00000000); // RegDioMapping1 0b00000000 DI0 RxReady & TxReady
   this.RegisterWriteByte(0x12, 0xff);// RegIrqFlags
}
…
class Program
{
   static void Main()
   {
      Rfm9XDevice rfm9XDevice = new Rfm9XDevice(SC20100.SpiBus.Spi3, SC20100.GpioPin.PA13, SC20100.GpioPin.PA14, SC20100.GpioPin.PE4);
      int sendCount = 0;

      // Put device into LoRa + Sleep mode
      rfm9XDevice.RegisterWriteByte(0x01, 0b10000000); // RegOpMode 

      // Set the frequency to 915MHz
      byte[] frequencyWriteBytes = { 0xE4, 0xC0, 0x00 }; // RegFrMsb, RegFrMid, RegFrLsb
      rfm9XDevice.RegisterWrite(0x06, frequencyWriteBytes);

      rfm9XDevice.RegisterWriteByte(0x0F, 0x0); // RegFifoRxBaseAddress 

      // More power PA Boost
      rfm9XDevice.RegisterWriteByte(0x09, 0b10000000); // RegPaConfig

      rfm9XDevice.RegisterWriteByte(0x01, 0b10000101); // RegOpMode set LoRa & RxContinuous

      while (true)
      {
         rfm9XDevice.RegisterWriteByte(0x0E, 0x0); // RegFifoTxBaseAddress 

         // Set the Register Fifo address pointer
         rfm9XDevice.RegisterWriteByte(0x0D, 0x0); // RegFifoAddrPtr 

         string messageText = $"Hello LoRa {sendCount += 1}!";

         // load the message into the fifo
         byte[] messageBytes = UTF8Encoding.UTF8.GetBytes(messageText);
         rfm9XDevice.RegisterWrite(0x0, messageBytes); // RegFifo 

         // Set the length of the message in the fifo
         rfm9XDevice.RegisterWriteByte(0x22, (byte)messageBytes.Length); // RegPayloadLength
         rfm9XDevice.RegisterWriteByte(0x40, 0b01000000); // RegDioMapping1 0b00000000 DI0 RxReady & TxReady
         rfm9XDevice.RegisterWriteByte(0x01, 0b10000011); // RegOpMode 

         Debug.WriteLine($"Sending {messageBytes.Length} bytes message {messageText}");

         Thread.Sleep(10000);
      }
   }
}

The diagnostic output shows inbound and outbound messages

Found debugger!
Create TS.
Loading Deployment Assemblies.
Attaching deployed file.
Assembly: mscorlib (2.0.0.0)  Attaching deployed file.
Assembly: GHIElectronics.TinyCLR.Devices.Spi (2.0.0.0)  Attaching deployed file.
Assembly: GHIElectronics.TinyCLR.Native (2.0.0.0)  Attaching deployed file.
Assembly: GHIElectronics.TinyCLR.Devices.Gpio (2.0.0.0)  Attaching deployed file.
Assembly: ReceiveTransmitInterrupt (1.0.0.0)  Resolving.
The debugging target runtime is loading the application assemblies and starting execution.
Ready.
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveTransmitInterrupt\bin\Debug\pe\..\GHIElectronics.TinyCLR.Native.dll'
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveTransmitInterrupt\bin\Debug\pe\..\GHIElectronics.TinyCLR.Devices.Gpio.dll'
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveTransmitInterrupt\bin\Debug\pe\..\GHIElectronics.TinyCLR.Devices.Spi.dll'
'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveTransmitInterrupt\bin\Debug\pe\..\ReceiveTransmitInterrupt.exe', Symbols loaded.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
Sending 13 bytes message Hello LoRa 1!
RegIrqFlags 0X08
Transmit-Done
Sending 13 bytes message Hello LoRa 2!
RegIrqFlags 0X08
Transmit-Done
Sending 13 bytes message Hello LoRa 3!
RegIrqFlags 0X08
Transmit-Done
RegIrqFlags 0X50
Receive-Message
Received 59 byte message  �LoRaIoT1Maduino2at 77.9,ah 24,wsa 0,wsg 1,wd 12.38,r 0.00,
Sending 13 bytes message Hello LoRa 4!
RegIrqFlags 0X08
Transmit-Done

15:11:42.775 -> ync word
15:11:42.775 -> 0x0: 0x8A
15:11:42.775 -> 0x1: 0x81
15:11:42.798 -> 0x2: 0x1A
15:11:42.798 -> 0x3: 0xB
15:11:42.798 -> 0x4: 0x0
15:11:42.798 -> 0x5: 0x52
…
15:11:44.223 -> 0x7B: 0x0
15:11:44.223 -> 0x7C: 0x0
15:11:44.256 -> 0x7D: 0x0
15:11:44.256 -> 0x7E: 0x0
15:11:44.256 -> 0x7F: 0x0
15:11:44.291 -> LoRa init succeeded.
15:11:44.839 -> Sending HeLoRa World! 0
15:11:48.788 -> Message: ⸮LoRaIoT1Maduino2at 77.5,ah 25,wsa 1,wsg 5,wd 21.00,r 0.00,
15:11:48.856 -> Length: 59
15:11:48.856 -> FirstChar: 136
15:11:48.891 -> RSSI: -83
15:11:48.891 -> Snr: 9.50
15:11:48.891 -> 
15:11:49.234 -> Message: Hello LoRa 22!
15:11:49.234 -> Length: 14
15:11:49.268 -> FirstChar: 72
15:11:49.268 -> RSSI: -47
15:11:49.268 -> Snr: 9.75
15:11:49.303 -> 
15:11:55.815 -> Sending HeLoRa World! 2
15:11:59.219 -> Message: Hello LoRa 23!
15:11:59.219 -> Length: 14
15:11:59.254 -> FirstChar: 72
15:11:59.254 -> RSSI: -48
15:11:59.254 -> Snr: 9.75
15:11:59.288 -> 
15:12:06.597 -> Sending HeLoRa World! 4
15:12:09.218 -> Message: Hello LoRa 24!
15:12:09.218 -> Length: 14
15:12:09.253 -> FirstChar: 72
15:12:09.253 -> RSSI: -46
15:12:09.253 -> Snr: 9.25
15:12:09.287 -> 
15:12:16.919 -> Sending HeLoRa World! 6
15:12:19.240 -> Message: Hello LoRa 25!
15:12:19.240 -> Length: 14
15:12:19.275 -> FirstChar: 72
15:12:19.275 -> RSSI: -47
15:12:19.275 -> Snr: 9.75
15:12:19.309 -> 

The final step is back porting all the necessary changes to my Rfm9XDevice class then functionality and stress testing.