After a month or so of posts the source code of V1.0 of my Wilderness Labs Meadow RFM9X/SX127X library is on GitHub. I included all of the source for my test harness and proof of concept(PoC) application so other people can follow along with “my meadow learning experience”.
I initially started with a Dragino LoRa Shield for Arduino and jumper cables. I did this so only the pins I was using on the shield were connected to the Meadow.
I then moved to an Adafruit LoRa Radio FeatherWing RFM95W 900MHz RadioFruit and Adafruit LoRa Radio FeatherWing – RFM95W 433 MHz – RadioFruit.
Using the jumper configuration above, the RFM9X constructor parameters are
- Chip Select D9 (yellow wire)
- Reset Pin D10 (grey wire)
- Interrupt pin D12 (brown wire)
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// Copyright (c) January 2020, devMobile Software
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
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namespace devMobile.IoT.Rfm9x.LoRaDeviceClient
{
using System;
using System.Diagnostics;
using System.Text;
using System.Threading.Tasks;
using Meadow;
using Meadow.Devices;
using Meadow.Hardware;
public class MeadowApp : App<F7Micro, MeadowApp>
{
private const double Frequency = 915000000.0;
private byte MessageCount = Byte.MaxValue;
private Rfm9XDevice rfm9XDevice;
public MeadowApp()
{
try
{
ISpiBus spiBus = Device.CreateSpiBus(500);
if (spiBus == null)
{
Console.WriteLine("spiBus == null");
}
rfm9XDevice = new Rfm9XDevice(Device, spiBus, Device.Pins.D09, Device.Pins.D10, Device.Pins.D12);
rfm9XDevice.Initialise(Frequency, paBoost: true, rxPayloadCrcOn: true);
#if DEBUG
rfm9XDevice.RegisterDump();
#endif
rfm9XDevice.OnReceive += Rfm9XDevice_OnReceive;
#if ADDRESSED_MESSAGES_PAYLOAD
rfm9XDevice.Receive(UTF8Encoding.UTF8.GetBytes("AddressHere"));
#else
rfm9XDevice.Receive();
#endif
rfm9XDevice.OnTransmit += Rfm9XDevice_OnTransmit;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
Task.Delay(10000).Wait();
while (true)
{
string messageText = string.Format("Hello from {0} ! {1}", Environment.MachineName, MessageCount);
MessageCount -= 2;
byte[] messageBytes = UTF8Encoding.UTF8.GetBytes(messageText);
Console.WriteLine("{0:HH:mm:ss}-TX {1} byte message {2}", DateTime.Now, messageBytes.Length, messageText);
#if ADDRESSED_MESSAGES_PAYLOAD
this.rfm9XDevice.Send(UTF8Encoding.UTF8.GetBytes("AddressHere"), messageBytes);
#else
this.rfm9XDevice.Send(messageBytes);
#endif
Task.Delay(10000).Wait();
}
}
private void Rfm9XDevice_OnReceive(object sender, Rfm9XDevice.OnDataReceivedEventArgs e)
{
try
{
string messageText = UTF8Encoding.UTF8.GetString(e.Data);
#if ADDRESSED_MESSAGES_PAYLOAD
string addressText = UTF8Encoding.UTF8.GetString(e.Address);
Console.WriteLine(@"{0:HH:mm:ss}-RX From {1} PacketSnr {2:0.0} Packet RSSI {3}dBm RSSI {4}dBm = {5} byte message ""{6}""", DateTime.Now, addressText, e.PacketSnr, e.PacketRssi, e.Rssi, e.Data.Length, messageText);
#else
Console.WriteLine(@"{0:HH:mm:ss}-RX PacketSnr {1:0.0} Packet RSSI {2}dBm RSSI {3}dBm = {4} byte message ""{5}""", DateTime.Now, e.PacketSnr, e.PacketRssi, e.Rssi, e.Data.Length, messageText);
#endif
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
private void Rfm9XDevice_OnTransmit(object sender, Rfm9XDevice.OnDataTransmitedEventArgs e)
{
Console.WriteLine("{0:HH:mm:ss}-TX Done", DateTime.Now);
}
}
}
My library works but some issues (Dec 2019) with the Serial Peripheral Interface (SPI) ReadRegister method, Debug.WriteLine and Console.WriteLine mean it should be treated as late beta.
The wilderness labs developers are regularly releasing updates which I will test with as soon as they are available.
