我们需要请求用户授予 USB 权限。 UsbDevicedevice=...// 之前获取的 USB 设备PendingIntentpermissionIntent=PendingIntent.getBroadcast(this,0,newIntent("com.example.USB_PERMISSION"),0);usbManager.requestPermission(device,permissionIntent); 1. 2. 3. 步骤3: 获取 USB 设备 一旦用户允许了权限,我们可以获取...
A typical example of isochronous data is voice. If the delivery rate of these data streams is not maintained,drop-outs in the data stream will occur due to buffer or frame underruns or overruns. Even if data isdelivered at the appropriate rate by USB hardware, delivery delays introduced by ...
USB Control Center软件提供了一个基本的回环测试功能,这里,我们依次点开Cpress USB BulkloopExample前面的+号,找到Bulk outendpoint (0x01),选中该项,在右侧 “Data Transfers” 的“Data to send (Hex)”中输入需要从 PC 发送到 FX3 的数据。然后点击 Transfer Data-OUT 即可实现数据发送。如下图X所示。 发送...
For low-speed and full-speed endpoints the following is valid: If the bus is idle, multiple Bulk Transfers can take place in a single 1ms frame (Interrupt and Isochronous Transfers are limited to a maximum of one packet per frame). For example, Bulk Transfers send data to a printer. As...
Hi, I need to use the MK66 USB for large high speed data transfers and short commands. I have the FRDMK66F example, but I can't find which USB example is most applicable to what I need. Can you recommend an examples? Thank you!
For example, an Internet telephony application that carries a conversation in real time is a good candidate for isochronous transfer mode. Isochronous data requires guaranteed amounts of bandwidth and guaranteed maximum transmission times. For isochronous transfers, timely data delivery is much more ...
example: streaming started successfully D/librs: Transfer thread started for endpoint address: 132 D/librs: Transfer thread started for endpoint address: 130 W/librs: bulk_transfer returned error, endpoint: �, error: Out of memory W/librs: bulk_transfer returned error, endpoint: �, ...
This meant that USB bulk is able to connect to host PC and transfer in and out data file correctly. Thank you very much. Phil Neumiller111 年多前 Prodigy80points Hi I am trying to run this example (dev_bulk) on an OMAP-L138...
6、r), 等时传输(Isochronous Transfer).o控制传输(Control Transfer)通常用于配置设备,获取设备信息,发送命令到设备,或者获取设备的状态报告等,总之就是用来传送控制信息的.o中断传输(Interrupt Transfer)用来以一个固定的速率传送少量的数据,USB 键盘和USB 鼠标使用的就是这种方式.o批量传输(Bulk Transfer)用来传输大...
For example, on the computer that I am typing on right now, I have a USB printer, a USB scanner, a USB Webcam and a USB network connection. My computer has only one USB connector on it, so the obvious question is, "How do you hook up all the devices?" The easy solution to ...