TinyCLR OS V2 LoRa library Part3

Transmit and Receive Basic

I had an Armtronix IA005 SX1276 loRa node sitting on my desk so used it running a modified version of the Arduino LoRa library LoRaSetSyncWord example to send messages to and receive messages from my SC20100 device.

Armtronix and SC20100 TinyCLR V2 testrig

The SC20100 transmit application configures the SX127X, sends a message, waits until transmission is completed, then repeats every 30 seconds.

   class Program
   {
      static void Main()
      {
         Rfm9XDevice rfm9XDevice = new Rfm9XDevice(SC20100.SpiBus.Spi3, SC20100.GpioPin.PA13, SC20100.GpioPin.PA14);

         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);

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

         //rfm9XDevice.RegisterDump();

         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

            Debug.WriteLine($"Sending {messageBytes.Length} bytes message {messageText}");
            /// Set the mode to LoRa + Transmit
            rfm9XDevice.RegisterWriteByte(0x01, 0b10000011); // RegOpMode 

            // Wait until send done, no timeouts in PoC
            Debug.WriteLine("Send-wait");
            byte IrqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
            while ((IrqFlags & 0b00001000) == 0)  // wait until TxDone cleared
            {
               Thread.Sleep(10);
               IrqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
               Debug.WriteLine(".");
            }
            rfm9XDevice.RegisterWriteByte(0x12, 0b00001000); // clear TxDone bit
            Debug.WriteLine("Send-Done");

            Thread.Sleep(30000);
         }
      }
   }

When I ran the SC20100 application in Visual Studio

'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\TransmitBasic\bin\Debug\pe\..\TransmitBasic.exe', Symbols loaded.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
Sending 13 bytes message Hello LoRa 1!
Send-wait
.
.
.
.
Send-Done
Sending 13 bytes message Hello LoRa 2!
Send-wait
.
.
.
.
Send-Done

I could the see the messages arriving at the Armtronix device in the Arduino monitor.

14:13:34.722 -> Message: Hello LoRa 1!
14:13:34.722 -> Length: 13
14:13:34.756 -> FirstChar: 72
14:13:34.756 -> RSSI: -48
14:13:34.756 -> Snr: 9.75
14:13:34.790 -> 
14:13:36.658 -> Sending HeLoRa World! 24
14:13:47.105 -> Sending HeLoRa World! 26
14:13:57.740 -> Sending HeLoRa World! 28
14:14:04.745 -> Message: Hello LoRa 2!
14:14:04.745 -> Length: 13
14:14:04.779 -> FirstChar: 72
14:14:04.779 -> RSSI: -49
14:14:04.779 -> Snr: 9.50
14:14:04.847 -> 

The SC20100 receive application configures the SX127X, polls a status register to looking to see if a message has arrived, displays it as text and then goes back to waiting.

   class Program
   {
      static void Main()
      {
         Rfm9XDevice rfm9XDevice = new Rfm9XDevice(SC20100.SpiBus.Spi3, SC20100.GpioPin.PA13, SC20100.GpioPin.PA14);

         // 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 

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

         while (true)
         {
            // Wait until a packet is received, no timeouts in PoC
            Debug.WriteLine("Receive-Wait");
            byte irqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
            while ((irqFlags & 0b01000000) == 0)  // wait until RxDone cleared
            {
               Thread.Sleep(100);
               irqFlags = rfm9XDevice.RegisterReadByte(0x12); // RegIrqFlags
               //Debug.Write(".");
            }
            Debug.WriteLine("");
            Debug.WriteLine($"RegIrqFlags 0X{irqFlags:X2}");
            Debug.WriteLine("Receive-Message");
            byte currentFifoAddress = rfm9XDevice.RegisterReadByte(0x10); // RegFifiRxCurrent
            rfm9XDevice.RegisterWriteByte(0x0d, currentFifoAddress); // RegFifoAddrPtr

            byte numberOfBytes = rfm9XDevice.RegisterReadByte(0x13); // RegRxNbBytes

            byte[] messageBytes = rfm9XDevice.RegisterRead(0x00, numberOfBytes); // RegFifo

            rfm9XDevice.RegisterWriteByte(0x0d, 0);
            rfm9XDevice.RegisterWriteByte(0x12, 0b11111111); // RegIrqFlags clear all the bits

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

            Debug.WriteLine("Receive-Done");
         }
      }
   }

When I ran the SC20100 application in Visual Studio

'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\ReceiveBasic\bin\Debug\pe\..\ReceiveBasic.exe', Symbols loaded.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
Receive-Wait

RegIrqFlags 0X50
Receive-Message
Received 16 byte message HeLoRa World! 74
Receive-Done
Receive-Wait

RegIrqFlags 0X50
Receive-Message
Received 59 byte message  �LoRaIoT1Maduino2at 64.6,ah 66,wsa 2,wsg 3,wd 37.13,r 0.00,
Receive-Done
Receive-Wait

RegIrqFlags 0X50
Receive-Message
Received 16 byte message HeLoRa World! 76
Receive-Done
Receive-Wait

RegIrqFlags 0X50
Receive-Message
Received 16 byte message HeLoRa World! 78
Receive-Done
Receive-Wait

I could the see the messages arriving at the Armtronix device in the Arduino monitor.

14:18:02.785 -> Sending HeLoRa World! 74
14:18:09.270 -> Message: ⸮LoRaIoT1Maduino2at 64.6,ah 66,wsa 2,wsg 3,wd 37.13,r 0.00,
14:18:09.339 -> Length: 59
14:18:09.339 -> FirstChar: 136
14:18:09.407 -> RSSI: -83
14:18:09.407 -> Snr: 9.75
14:18:09.407 -> 
14:18:13.249 -> Sending HeLoRa World! 76
14:18:23.416 -> Sending HeLoRa World! 78
14:18:33.582 -> Sending HeLoRa World! 80
14:18:43.883 -> Sending HeLoRa World! 82
14:18:54.136 -> Sending HeLoRa World! 84

I’ll merge the transmit and receive on interrupt samples in the next post as a final step before porting the core library modules.

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