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Jun 05, 2014 Serial makes it easy to connect your Mac to almost anything with a serial port, including routers, switches, PBXs, embedded devices and more. In addition to a full-featured terminal emulator, Serial includes built-in, user-space drivers for many popular devices, saving you the hassle of finding, installing, and updating drivers. Use the Windows Runtime APIs, introduced in Windows 8.1, to write UWP apps that gives users access to their peripheral USB device. Such apps can connect to a device based on user-specified criteria, get information about the device, send data to the device and conversely get data streams from the device, and poll the device for interrupt data.
Summary
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Important APIs
When you write a UWP app that interacts with a USB device, the app can send control commands, get device information, and read and write data to/from bulk and interrupt endpoints. Before you can do all that, you must find the device and establish connection.
Before you start..
Flowchart: Finding the device
To connect to a USB device, you must first find the device based on various discovery patterns and then connect to it:
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What is a device interface GUID?
A kernel-model driver, during its initialization, register and exposes a GUID called the device interface GUID. Typically, the app uses the exposed GUID to find the associated driver and its device, and then open a handle to the device. The retrieved handle is used for subsequent read and write operations.
However, in the case of Winusb.sys, instead of the driver exposing the device interface GUID, it can be provided in one of two ways:
If a device interface GUID is found for the device, your UWP app can find all devices that match that device interface GUID.
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How is USB device identification shown in Windows?
Every USB device must have two pieces of information: vendor ID and product ID.
USB-IF assigns those identifiers and the device manufacturer must expose them in the device. So how can you obtain that information?
Your UWP app can find all devices that match a specific vendor and product ids. You can narrow the search results by specifying the device interface GUID.
What are USB device classes?
Most USB devices conform to device class specifications approved by USB-IF. By using those specifications, devices of similar nature can exhibit their functionality in a standard way. The biggest advantage of this approach is that the device can use a Microsoft provided in-box class driver or the generic Winusb.sys driver.
Some devices might not follow a USB-IF specification. Instead they expose vendor-defined functionality. For such devices, either the vendor must provide the device driver or Winusb.sys can be used.
Whether a device is vendor-defined or conforms to a device class, it must describe this device class related information:
For example, the SuperMUTT device is a vendor-defined device and that information is indicated by class code is FF. If your device shows class code as FEh, subclass code as 02h, and protocol code 00h, you can conclude that the device is a class-compliant IrDA bridge device.Your UWP app can communicate with devices that belong to these device classes:
Your UWP app can find all devices that match a specific set of class, subclass, and protocol codes.
Get the Advanced Query Syntax (AQS) string for the device
Generate an advanced query string (AQS) that contains identification information about the device that you want to detect. You can generate the string either by specifying the vendor/product IDs, device interface GUID, or by the device class.
Finding the device—The basic way
This is the simplest way to find a USB device. For details, see Quickstart: enumerating commonly used devices.
Find the device—using DeviceWatcher
Alternatively, you can enumerate devices dynamically. Then, your app can receive notification if devices are added or removed, or if device properties change. For more information, see How to get notifications if devices are added, removed, or changed.
A DeviceWatcher object enables an app to dynamically detect devices as they get added and removed from the system.
This code example shows how to create and start a device watcher to look for instances of the SuperMUTT device.
Open the device
To open the device, the app must start an asynchronous operation by calling the static method FromIdAsync and passing the device instance path (obtained from DeviceInformation.Id). That result of that operation obtain is a UsbDevice object, which is used for future communication with the device, such as performing data transfers.
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After you are finished using the UsbDevice object, you must release it. By releasing the object, all pending data transfers are canceled. The completion callback routines for those operations are still invoked with canceled error or the operation completed.
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C++ apps must release the reference by using the delete keyword. C#/VB apps must call the UsbDevice.Dispose method. JavaScript apps must call UsbDevice.Close.
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The FromIdAsync fails if the device is in use or cannot be found.
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