RegisterManager Refactor
I had been meaning to refactor the code for accessing the registers of the RFM69CW/RFM69HCW module (based on the Semtech SX1231/SX1231H) registers for a while.
There is now a lot less code in the startup.cs file and the code for configuring the RFM69 is more obvious
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namespace devMobile.IoT.Rfm69Hcw.RefactorRegisterManager
{
using System;
using System.Diagnostics;
using System.Text;
using System.Threading.Tasks;
using Windows.ApplicationModel.Background;
using Windows.Devices.Gpio;
sealed class Rfm69HcwDevice
{
private GpioPin InterruptGpioPin = null;
public RegisterManager RegisterManager = null; // Future refactor this will be made private
public Rfm69HcwDevice(ChipSelectPin chipSelectPin, int resetPin, int interruptPin)
{
RegisterManager = new RegisterManager(chipSelectPin);
// Factory reset pin configuration
GpioController gpioController = GpioController.GetDefault();
GpioPin resetGpioPin = gpioController.OpenPin(resetPin);
resetGpioPin.SetDriveMode(GpioPinDriveMode.Output);
resetGpioPin.Write(GpioPinValue.High);
Task.Delay(100);
resetGpioPin.Write(GpioPinValue.Low);
Task.Delay(10);
// Interrupt pin for RX message & TX done notification
InterruptGpioPin = gpioController.OpenPin(interruptPin);
resetGpioPin.SetDriveMode(GpioPinDriveMode.Input);
InterruptGpioPin.ValueChanged += InterruptGpioPin_ValueChanged;
}
private void InterruptGpioPin_ValueChanged(GpioPin sender, GpioPinValueChangedEventArgs args)
{
if (args.Edge != GpioPinEdge.RisingEdge)
{
return;
}
byte irqFlags = RegisterManager.ReadByte(0x28); // RegIrqFlags2
Debug.WriteLine("{0:HH:mm:ss.fff} RegIrqFlags {1}", DateTime.Now, Convert.ToString((byte)irqFlags, 2).PadLeft(8, '0'));
if ((irqFlags & 0b00000100) == 0b00000100) // PayLoadReady set
{
// Read the length of the buffer
byte numberOfBytes = RegisterManager.ReadByte(0x0);
// Allocate buffer for message
byte[] messageBytes = new byte[numberOfBytes];
for (int i = 0; i < numberOfBytes; i++)
{
messageBytes[i] = RegisterManager.ReadByte(0x00); // RegFifo
}
string messageText = UTF8Encoding.UTF8.GetString(messageBytes);
Debug.WriteLine("{0:HH:mm:ss} Received {1} byte message {2}", DateTime.Now, messageBytes.Length, messageText);
}
if ((irqFlags & 0b00001000) == 0b00001000) // PacketSent set
{
RegisterManager.WriteByte(0x01, 0b00010000); // RegOpMode set ReceiveMode
Debug.WriteLine("{0:HH:mm:ss.fff} Transmit-Done", DateTime.Now);
}
}
public void RegisterDump()
{
RegisterManager.Dump(0x0, 0x40);
}
}
public sealed class StartupTask : IBackgroundTask
{
private const int ResetPin = 25;
private const int InterruptPin = 22;
private Rfm69HcwDevice rfm69Device = new Rfm69HcwDevice(ChipSelectPin.CS1, ResetPin, InterruptPin);
const double RH_RF6M9HCW_FXOSC = 32000000.0;
const double RH_RFM69HCW_FSTEP = RH_RF6M9HCW_FXOSC / 524288.0;
public void Run(IBackgroundTaskInstance taskInstance)
{
//rfm69Device.RegisterDump();
// regOpMode standby
rfm69Device.RegisterManager.WriteByte(0x01, 0b00000100);
// BitRate MSB/LSB
rfm69Device.RegisterManager.WriteByte(0x03, 0x34);
rfm69Device.RegisterManager.WriteByte(0x04, 0x00);
// Frequency deviation
rfm69Device.RegisterManager.WriteByte(0x05, 0x02);
rfm69Device.RegisterManager.WriteByte(0x06, 0x3d);
// Calculate the frequency accoring to the datasheett
byte[] bytes = BitConverter.GetBytes((uint)(915000000.0 / RH_RFM69HCW_FSTEP));
Debug.WriteLine("Byte Hex 0x{0:x2} 0x{1:x2} 0x{2:x2} 0x{3:x2}", bytes[0], bytes[1], bytes[2], bytes[3]);
rfm69Device.RegisterManager.WriteByte(0x07, bytes[2]);
rfm69Device.RegisterManager.WriteByte(0x08, bytes[1]);
rfm69Device.RegisterManager.WriteByte(0x09, bytes[0]);
// RegRxBW
rfm69Device.RegisterManager.WriteByte(0x19, 0x2a);
// RegDioMapping1
rfm69Device.RegisterManager.WriteByte(0x26, 0x01);
// Setup preamble length to 16 (default is 3) RegPreambleMsb RegPreambleLsb
rfm69Device.RegisterManager.WriteByte(0x2C, 0x0);
rfm69Device.RegisterManager.WriteByte(0x2D, 0x10);
// RegSyncConfig Set the Sync length and byte values SyncOn + 3 custom sync bytes
rfm69Device.RegisterManager.WriteByte(0x2e, 0x90);
// RegSyncValues1 thru RegSyncValues3
rfm69Device.RegisterManager.WriteByte(0x2f, 0xAA);
rfm69Device.RegisterManager.WriteByte(0x30, 0x2D);
rfm69Device.RegisterManager.WriteByte(0x31, 0xD4);
// RegPacketConfig1 Variable length with CRC on
rfm69Device.RegisterManager.WriteByte(0x37, 0x90);
rfm69Device.RegisterDump();
while (true)
{
// Standby mode while loading message into FIFO
rfm69Device.RegisterManager.WriteByte(0x01, 0b00000100);
byte[] messageBuffer = UTF8Encoding.UTF8.GetBytes("hello world " + DateTime.Now.ToLongTimeString());
rfm69Device.RegisterManager.WriteByte(0x0, (byte)messageBuffer.Length);
rfm69Device.RegisterManager.Write(0x0, messageBuffer);
// Transmit mode once FIFO loaded
rfm69Device.RegisterManager.WriteByte(0x01, 0b00001100);
Debug.WriteLine("{0:HH:mm:ss.fff} Send-Done", DateTime.Now);
Task.Delay(5000).Wait();
}
}
}
}
I’ll modify the constructor reset pin support to see if I can get the Seegel Systeme hat working.
Register dump
Register 0x00 - Value 0X00 - Bits 00000000
Register 0x01 - Value 0X04 - Bits 00000100
Register 0x02 - Value 0X00 - Bits 00000000
Register 0x03 - Value 0X34 - Bits 00110100
…
Register 0x3e - Value 0X00 - Bits 00000000
Register 0x3f - Value 0X00 - Bits 00000000
Register 0x40 - Value 0X00 - Bits 00000000
19:58:52.828 Send-Done
19:58:53.022 RegIrqFlags 00001000
19:58:53.036 Transmit-Done
19:58:54.188 RegIrqFlags 01000110
19:58:54 Received 14 byte message Hello world:1
The thread 0xa10 has exited with code 0 (0x0).
The thread 0xf90 has exited with code 0 (0x0).
19:58:57.652 RegIrqFlags 01000110
19:58:57 Received 14 byte message Hello world:2
19:58:57.892 Send-Done
19:58:58.039 RegIrqFlags 00001000
19:58:58.053 Transmit-Done
19:59:01.115 RegIrqFlags 01000110
19:59:01 Received 14 byte message Hello world:3
19:59:02.936 Send-Done
19:59:03.083 RegIrqFlags 00001000
19:59:03.096 Transmit-Done
19:59:04.577 RegIrqFlags 01000110
19:59:04 Received 14 byte message Hello world:4
The thread 0xa5c has exited with code 0 (0x0).
19:59:08.001 Send-Done
19:59:08.122 RegIrqFlags 01001000
19:59:08.139 Transmit-Done
19:59:11.504 RegIrqFlags 01000110
19:59:11 Received 14 byte message Hello world:6
The thread 0xb18 has exited with code 0 (0x0).
19:59:13.079 Send-Done
19:59:13.226 RegIrqFlags 00001000
19:59:13.240 Transmit-Done
19:59:14.966 RegIrqFlags 01000110
19:59:14 Received 14 byte message Hello world:7
Based how my rate of progress improved when I did this on the RFM9X library I really should have done this much earlier.
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