TinyCLR OS V2 LoRa library Part2

Register Dump, Read and Write

Next step was to dump all registers (0x00 thru 0x42) of the SX1276/7/8/9 device and confirm I could read/write registers as bytes, words and arrays of bytes. The original TinyCLR V1 code didn’t require many changes to work with TinyCLR V2(Preview 5), and these were mainly limited to SPI port setup.

I do like the TinyCLR support for string interpolation with the $ special character. Often neat language features like this have been first to go to reduce the size of the runtime.

namespace devMobile.IoT.Rfm9x.RegisterScan
{
   using System;
   using System.Diagnostics;
   using System.Threading;
   using GHIElectronics.TinyCLR.Devices.Gpio;
   using GHIElectronics.TinyCLR.Devices.Spi;
   using GHIElectronics.TinyCLR.Pins;

   public sealed class Rfm9XDevice
   {
      private SpiDevice rfm9XLoraModem = null;

      public Rfm9XDevice(string spiPortName, int chipSelectPin)
      {
         GpioPin chipSelectGpio = GpioController.GetDefault().OpenPin(chipSelectPin);

         var settings = new SpiConnectionSettings()
         {
            ChipSelectType = SpiChipSelectType.Gpio,
            ChipSelectLine = chipSelectGpio,
            Mode = SpiMode.Mode0,
            ClockFrequency = 500000,
            ChipSelectActiveState = false,
         };

         SpiController spiController = SpiController.FromName(spiPortName);

         rfm9XLoraModem = spiController.GetDevice(settings);
      }

      public Byte RegisterReadByte(byte registerAddress)
      {
         byte[] writeBuffer = new byte[] { registerAddress, 0x0 };
         byte[] readBuffer = new byte[writeBuffer.Length];
         Debug.Assert(rfm9XLoraModem != null);

         rfm9XLoraModem.TransferFullDuplex(writeBuffer, readBuffer);

         return readBuffer[1];
      }
   }

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

         while (true)
         {
            for (byte registerIndex = 0; registerIndex <= 0x42; registerIndex++)
            {
               byte registerValue = rfm9XDevice.RegisterReadByte(registerIndex);

               Debug.WriteLine($"Register 0x{registerIndex:x2} - Value 0X{registerValue:x2}");
            }
            Debug.WriteLine("");

            Thread.Sleep(10000);
         }
      }
   }
}

The output of the application looked like this

'GHIElectronics.TinyCLR.VisualStudio.ProjectSystem.dll' (Managed): Loaded 'C:\Users\BrynLewis\source\repos\RFM9X.TinyCLR\RegisterScan\bin\Debug\pe\..\RegisterScan.exe', Symbols loaded.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
Register 0x00 - Value 0X00
Register 0x01 - Value 0X0f
Register 0x02 - Value 0X1a
Register 0x03 - Value 0X0b
Register 0x04 - Value 0X00
Register 0x05 - Value 0X52
Register 0x06 - Value 0X6c
Register 0x07 - Value 0X80
Register 0x08 - Value 0X00
Register 0x09 - Value 0X4f
Register 0x0a - Value 0X09
Register 0x0b - Value 0X2b
Register 0x0c - Value 0X20
Register 0x0d - Value 0X08
Register 0x0e - Value 0X02
Register 0x0f - Value 0X0a
Register 0x10 - Value 0Xff
Register 0x11 - Value 0X00
Register 0x12 - Value 0X15
Register 0x13 - Value 0X0b
Register 0x14 - Value 0X28
Register 0x15 - Value 0X0c
Register 0x16 - Value 0X12
Register 0x17 - Value 0X47
Register 0x18 - Value 0X32
Register 0x19 - Value 0X3e
Register 0x1a - Value 0X00
Register 0x1b - Value 0X00
Register 0x1c - Value 0X00
Register 0x1d - Value 0X00
Register 0x1e - Value 0X00
Register 0x1f - Value 0X40
Register 0x20 - Value 0X00
Register 0x21 - Value 0X00
Register 0x22 - Value 0X00
Register 0x23 - Value 0X00
Register 0x24 - Value 0X0d
Register 0x25 - Value 0X00
Register 0x26 - Value 0X03
Register 0x27 - Value 0X93
Register 0x28 - Value 0X55
Register 0x29 - Value 0X55
Register 0x2a - Value 0X55
Register 0x2b - Value 0X55
Register 0x2c - Value 0X55
Register 0x2d - Value 0X55
Register 0x2e - Value 0X55
Register 0x2f - Value 0X55
Register 0x30 - Value 0X90
Register 0x31 - Value 0X40
Register 0x32 - Value 0X40
Register 0x33 - Value 0X00
Register 0x34 - Value 0X00
Register 0x35 - Value 0X0f
Register 0x36 - Value 0X00
Register 0x37 - Value 0X00
Register 0x38 - Value 0X00
Register 0x39 - Value 0Xf5
Register 0x3a - Value 0X20
Register 0x3b - Value 0X82
Register 0x3c - Value 0X00
Register 0x3d - Value 0X02
Register 0x3e - Value 0X00
Register 0x3f - Value 0X40
Register 0x40 - Value 0X00
Register 0x41 - Value 0X00
Register 0x42 - Value 0X12

The device was not in LoRa mode (Bit 7 of RegOpMode 0x01) so the next step was to update the TinyCLR V1 code and confirm I could change the device configuration.

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

         rfm9XDevice.RegisterDump();

         while (true)
         {
            Debug.WriteLine("Read RegOpMode (read byte)");
            Byte regOpMode1 = rfm9XDevice.RegisterReadByte(0x1);
            Debug.WriteLine($"RegOpMode 0x{regOpMode1:x2}");

            Debug.WriteLine("Set LoRa mode and sleep mode (write byte)");
            rfm9XDevice.RegisterWriteByte(0x01, 0b10000000);

            Debug.WriteLine("Read RegOpMode (read byte)");
            Byte regOpMode2 = rfm9XDevice.RegisterReadByte(0x1);
            Debug.WriteLine($"RegOpMode 0x{regOpMode2:x2}");

            Debug.WriteLine("Read the preamble (read word)");
            ushort preamble = rfm9XDevice.RegisterReadWord(0x20);
            Debug.WriteLine($"Preamble 0x{preamble:x2}");

            Debug.WriteLine("Set the preamble to 0x80 (write word)");
            rfm9XDevice.RegisterWriteWord(0x20, 0x80);

            Debug.WriteLine("Read the center frequency (read byte array)");
            byte[] frequencyReadBytes = rfm9XDevice.RegisterRead(0x06, 3);
            Debug.WriteLine($"Frequency Msb 0x{frequencyReadBytes[0]:x2} Mid 0x{frequencyReadBytes[1]:x2} Lsb 0x{frequencyReadBytes[2]:x2}");

            Debug.WriteLine("Set the center frequency to 915MHz (write byte array)");
            byte[] frequencyWriteBytes = { 0xE4, 0xC0, 0x00 };
            rfm9XDevice.RegisterWrite(0x06, frequencyWriteBytes);

            rfm9XDevice.RegisterDump();

            Thread.Sleep(30000);
         }
      }

The output of the application looked like this

Register dump
Register 0x00 - Value 0X00
Register 0x01 - Value 0X09
Register 0x02 - Value 0X1a
Register 0x03 - Value 0X0b
Register 0x04 - Value 0X00
Register 0x05 - Value 0X52
Register 0x06 - Value 0X6c
Register 0x07 - Value 0X80
Register 0x08 - Value 0X00
Register 0x09 - Value 0X4f
Register 0x0a - Value 0X09
Register 0x0b - Value 0X2b
Register 0x0c - Value 0X20
Register 0x0d - Value 0X08
Register 0x0e - Value 0X02
Register 0x0f - Value 0X0a
Register 0x10 - Value 0Xff
Register 0x11 - Value 0X71
Register 0x12 - Value 0X15
Register 0x13 - Value 0X0b
Register 0x14 - Value 0X28
Register 0x15 - Value 0X0c
Register 0x16 - Value 0X12
Register 0x17 - Value 0X47
Register 0x18 - Value 0X32
Register 0x19 - Value 0X3e
Register 0x1a - Value 0X00
Register 0x1b - Value 0X00
Register 0x1c - Value 0X00
Register 0x1d - Value 0X00
Register 0x1e - Value 0X00
Register 0x1f - Value 0X40
Register 0x20 - Value 0X00
Register 0x21 - Value 0X00
Register 0x22 - Value 0X00
Register 0x23 - Value 0X00
Register 0x24 - Value 0X05
Register 0x25 - Value 0X00
Register 0x26 - Value 0X03
Register 0x27 - Value 0X93
Register 0x28 - Value 0X55
Register 0x29 - Value 0X55
Register 0x2a - Value 0X55
Register 0x2b - Value 0X55
Register 0x2c - Value 0X55
Register 0x2d - Value 0X55
Register 0x2e - Value 0X55
Register 0x2f - Value 0X55
Register 0x30 - Value 0X90
Register 0x31 - Value 0X40
Register 0x32 - Value 0X40
Register 0x33 - Value 0X00
Register 0x34 - Value 0X00
Register 0x35 - Value 0X0f
Register 0x36 - Value 0X00
Register 0x37 - Value 0X00
Register 0x38 - Value 0X00
Register 0x39 - Value 0Xf5
Register 0x3a - Value 0X20
Register 0x3b - Value 0X82
Register 0x3c - Value 0Xff
Register 0x3d - Value 0X02
Register 0x3e - Value 0X80
Register 0x3f - Value 0X40
Register 0x40 - Value 0X00
Register 0x41 - Value 0X00
Register 0x42 - Value 0X12
Read RegOpMode (read byte)
RegOpMode 0x09
Set LoRa mode and sleep mode (write byte)
Read RegOpMode (read byte)
RegOpMode 0x80
Read the preamble (read word)
Preamble 0x08
Set the preamble to 0x80 (write word)
Read the center frequency (read byte array)
Frequency Msb 0x6c Mid 0x80 Lsb 0x00
Set the center frequency to 915MHz (write byte array)
Register dump
Register 0x00 - Value 0X88
Register 0x01 - Value 0X80
Register 0x02 - Value 0X1a
Register 0x03 - Value 0X0b
Register 0x04 - Value 0X00
Register 0x05 - Value 0X52
Register 0x06 - Value 0Xe4
Register 0x07 - Value 0Xc0
Register 0x08 - Value 0X00
Register 0x09 - Value 0X4f
Register 0x0a - Value 0X09
Register 0x0b - Value 0X2b
Register 0x0c - Value 0X20
Register 0x0d - Value 0X01
Register 0x0e - Value 0X80
Register 0x0f - Value 0X00
Register 0x10 - Value 0X00
Register 0x11 - Value 0X00
Register 0x12 - Value 0X00
Register 0x13 - Value 0X00
Register 0x14 - Value 0X00
Register 0x15 - Value 0X00
Register 0x16 - Value 0X00
Register 0x17 - Value 0X00
Register 0x18 - Value 0X10
Register 0x19 - Value 0X00
Register 0x1a - Value 0X00
Register 0x1b - Value 0X00
Register 0x1c - Value 0X00
Register 0x1d - Value 0X72
Register 0x1e - Value 0X70
Register 0x1f - Value 0X64
Register 0x20 - Value 0X80
Register 0x21 - Value 0X00
Register 0x22 - Value 0X01
Register 0x23 - Value 0Xff
Register 0x24 - Value 0X00
Register 0x25 - Value 0X00
Register 0x26 - Value 0X04
Register 0x27 - Value 0X00
Register 0x28 - Value 0X00
Register 0x29 - Value 0X00
Register 0x2a - Value 0X00
Register 0x2b - Value 0X00
Register 0x2c - Value 0X00
Register 0x2d - Value 0X50
Register 0x2e - Value 0X14
Register 0x2f - Value 0X45
Register 0x30 - Value 0X55
Register 0x31 - Value 0Xc3
Register 0x32 - Value 0X05
Register 0x33 - Value 0X27
Register 0x34 - Value 0X1c
Register 0x35 - Value 0X0a
Register 0x36 - Value 0X03
Register 0x37 - Value 0X0a
Register 0x38 - Value 0X42
Register 0x39 - Value 0X12
Register 0x3a - Value 0X49
Register 0x3b - Value 0X1d
Register 0x3c - Value 0X00
Register 0x3d - Value 0Xaf
Register 0x3e - Value 0X00
Register 0x3f - Value 0X00
Register 0x40 - Value 0X00
Register 0x41 - Value 0X00
Register 0x42 - Value 0X12

In addition to confirming register read/write worked, I also temporarily exposed the SX127X/RFM9X reset functionality to ensure the device registers were being reset to factory as well.

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