Meadow.Foundation.ICs.IOExpanders.Sc16is7x2 2.4.0

Meadow.Foundation.ICs.IOExpanders.Sc16is7x2

SC16IS7x2 SPI I2C family of UART expanders (SC16IS752, SC16IS762)

The Sc16is7x2 library is included in the Meadow.Foundation.ICs.IOExpanders.Sc16is7x2 nuget package and is designed for the Wilderness Labs Meadow .NET IoT platform.

This driver is part of the Meadow.Foundation peripherals library, an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT applications.

For more information on developing for Meadow, visit developer.wildernesslabs.co.

To view all Wilderness Labs open-source projects, including samples, visit github.com/wildernesslabs.

Installation

You can install the library from within Visual studio using the the NuGet Package Manager or from the command line using the .NET CLI:

dotnet add package Meadow.Foundation.ICs.IOExpanders.Sc16is7x2

Usage

private Sc16is752? _expander = null;

private ISerialPort? _expanderPort = null;
private ISerialPort? _nativePort = null;

private const int Rate = 9600;

public override async Task Initialize()
{
    // NOTE: This sample connects PortA on the expander back to COM1 on the F7Feather
    Resolver.Log.Info("Initialize...");

    var address = Sc16is7x2.Addresses.Address_0x4D;

    try
    {
        _expander = new Sc16is752(
            Device.CreateI2cBus(),
            new Meadow.Units.Frequency(1.8432, Meadow.Units.Frequency.UnitType.Megahertz),
            address);

        _expanderPort = _expander.PortA.CreateSerialPort(Rate);
        _nativePort = Device.PlatformOS.GetSerialPortName("com1")?.CreateSerialPort(Rate);
    }
    catch (Exception ex)
    {
        Resolver.Log.Error($"Failed to initialize 0x{(byte)address:X2}: {ex.Message}");
        await Task.Delay(1000);
    }
}

public override Task Run()
{
    if (_expander == null || _expanderPort == null || _nativePort == null)
    {
        return Task.CompletedTask;
    }

    Task.Run(() => PingReply(_expanderPort, _nativePort));

    while (true)
    {
        Thread.Sleep(1000);
    }
}

private async Task PingReply(ISerialPort portA, ISerialPort portB)
{
    var readBuffer = new byte[64];

    Resolver.Log.Info("Opening ports...");
    portA.Open();
    portB.Open();

    var abMessage = "ping\n";
    var baMessage = "reply\n";
    var count = 0;

    while (true)
    {
        try
        {
            // A -> B
            Resolver.Log.Info($"TEST A->B");
            var messageAB = Encoding.ASCII.GetBytes(abMessage);
            Resolver.Log.Info($"Writing {messageAB.Length} bytes on A...");
            Resolver.Log.Info($"  {BitConverter.ToString(messageAB)}");

            portA.Write(messageAB);

            Resolver.Log.Info($"Reading on B...");
            count = 0;
            while (count < messageAB.Length)
            {
                count += portB.Read(readBuffer, count, messageAB.Length);
            }

            Resolver.Log.Info($"Read {count} bytes on B");
            Resolver.Log.Info($"  {BitConverter.ToString(readBuffer, 0, count)}");

            var rxString = Encoding.ASCII.GetString(readBuffer, 0, count);
            Resolver.Log.Info($"A sent: {abMessage}");
            Resolver.Log.Info($"B received: {rxString}\n");

            // B -> A
            Resolver.Log.Info($"TEST B->A");
            var messageBA = Encoding.ASCII.GetBytes(baMessage);
            Resolver.Log.Info($"Responding with {messageBA.Length} bytes on B...");
            Resolver.Log.Info($"  {BitConverter.ToString(messageBA)}");

            portB.Write(messageBA);
            Resolver.Log.Info($"Reading on A...");
            count = 0;
            while (count < messageBA.Length)
            {
                count += portA.Read(readBuffer, count, messageBA.Length);
            }

            Resolver.Log.Info($"Read {count} bytes on A");
            Resolver.Log.Info($"  {BitConverter.ToString(readBuffer, 0, count)}");

            rxString = Encoding.ASCII.GetString(readBuffer, 0, count);
            Resolver.Log.Info($"B sent: {baMessage}");
            Resolver.Log.Info($"A received: {rxString}\n");

            await Task.Delay(30000);
        }
        catch (Exception ex)
        {
            Resolver.Log.Error($"Test error: {ex.Message}");
            await Task.Delay(5000);
        }
    }
}
        

How to Contribute

• Found a bug? Report an issue
• Have a feature idea or driver request? Open a new feature request
• Want to contribute code? Fork the Meadow.Foundation repository and submit a pull request against the develop branch

Need Help?

If you have questions or need assistance, please join the Wilderness Labs community on Slack.

About Meadow

Meadow is a complete, IoT platform with defense-grade security that runs full .NET applications on embeddable microcontrollers and Linux single-board computers including Raspberry Pi and NVIDIA Jetson.

Build

Use the full .NET platform and tooling such as Visual Studio and plug-and-play hardware drivers to painlessly build IoT solutions.

Connect

Utilize native support for WiFi, Ethernet, and Cellular connectivity to send sensor data to the Cloud and remotely control your peripherals.

Deploy

Instantly deploy and manage your fleet in the cloud for OtA, health-monitoring, logs, command + control, and enterprise backend integrations.