Meadow.Foundation.ICs.IOExpanders.Sc16is7x2 1.8.0.1

Meadow.Foundation.ICs.IOExpanders.Sc16is7x2

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

The Sc16is7x2 library is designed for the Wilderness Labs Meadow .NET IoT platform and is part of Meadow.Foundation.

The Meadow.Foundation peripherals library is an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT application.

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.

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.