CyAPI.lib XferData中断

你好，
当数据准备就绪时，设备无法关闭主机。由于USB协议是主机控制的，所以主机必须请求数据。如果缓冲区中有数据，设备将通过发送数据做出响应，XFEDATA将返回true，否则为false。所以，轮询是唯一的出路。USB2.0就是这样。
这个轮询功能在USB 3上得到了改进。在USB 3设备中，可以向主机发送异步通知，而不是主机轮询。
当做，
加亚特里



     以下为原文
   Hi,
     
    There is no way the device can intimate the host when the data is ready. Since the USB protocol is host controlled, it is the host that has to request for data. If there is data in the buffer, device will respond by sending the data and Xferdata will return TRUE, else FALSE. So, polling is the only way out. This is so in USB2.0.
    This polling feature has been improved upon in USB 3.0. In USB 3.0 device can send Asynchronous notifications to the device, instead of host polling.
     
    Regards,
    Gayathri

有可能使用中断端点来解决这个问题吗？在这种情况下，PC服务器中的主机控制器将在不加载用户应用程序的情况下查询EndoPoT。有人有这样做的经验吗？CYPRESSprovode是否有一个示例代码（比如BukLoad示例），用于演示中断传递功能和配置FX2、用户应用程序和CyApi使用Windows消息通知数据可访问性？



     以下为原文
  Is it possible to solve this problem using INTERRUPT endpoint? Is this case the host controller in PC iself will poll the endopint without loading of user app. Does anybody have the experience of doing so? Does CYPRESS provode an example code (like BUKLOOP example) for demonstration of interrupt transfer functionality and configuring FX2, user application and CyApi to use windows messages for notification of data availiability?

你好，
即使对于中断端点，应用程序也必须对端点中断中的数据进行轮询，如果您使用的是某些厂商专用的绑定到CysB.SIS的SPE。但是如果设备像鼠标/键盘一样绑定到Windows HID驱动程序，那么轮询将被处理。但在另一种情况下，应用程序本身必须继续调用XFEDATA以固定间隔读取数据。
当做，
加亚特里



     以下为原文
   Hi,
     
    Even for INTERRUPT endpoints, the application will have to poll for the data from INTERRUPT IN endpoint, if you are using some vendor ecific spdevice bound to CyUSB.sys. But if the device is something like a mouse/keyboard that is bound to the Windows HID driver, then the polling will be taken care of by that. But in the other case, the application itself has to keep calling the XferData for reading the data in fixed intervals.
     
    Regards,
    Gayathri

你好，
虽然USB协议定义了中断端点的轮询间隔，但主机将不进行轮询，除非它有缓冲区来存储所接收的数据，即应用程序或驱动程序必须设置缓冲器，然后将请求发送到中断端点。
对于类特定设备，如HID设备，主机有一个本地驱动程序，知道如何处理数据，因此默认情况下进行轮询，并处理数据。在自定义类设备中，我们定义了如何使用数据以及需要什么，因此主机不会默认进行查询。因此，您必须在应用程序中排队请求，或者如果您希望定期轮询，则可以通过编写自定义驱动程序来将轮询移动到驱动程序。
当做，
阿南德



     以下为原文
  Hi,
    Though USB protocol defines the polling interval for interrupt endpoint the host won't poll unless it has buffer to store the received data i.e. the application or driver has to setup the buffer and then send reqeust to interrupt endpoint.
    For class specific devices like HID devices the host has a native driver and knows what to do with the data so it polls by default and processes the data. In custom class devices we define how the data is being used and what it is needed so host won't poll by default. So you either have to queue up requests in the application or move the  polling to the driver by writing a custom driver if you want the polling at regular intervals.
    Regards,
    Anand