所有与USB相关的代码都在drivers/usb目录下面。上面的Kconfig文件说的很清楚,ehci-hcd模块支持的是USB2.0控制器的高速模式,它本身并不支持全速或低速模式,对连 智能推荐 EHCI主机控制器--队列元素传输描述符(qTD) 此数据结构仅用于队列头。此数据结构用于一个或多个USB事务,这个数据结构用于传输最多20480(5*4096)...
将下列选项由“not set”或“y”状态设置为“m”,并保存退出; CONFIG_USB_EHCI_HCD=m CONFIG_USB_OHCI_HCD=m CONFIG_USB_UHCI_HCD=m make bzImage开始重新编译。
Client Driver Software System Software Universal Serial Bus Driver (USBD) Universal Host Controller Driver (HCD) Hardware Universal Host Controller (HC) USB Scope Of UHCI USB Device usb_blk.drw Figure 1. Universal Serial Bus System Block Diagram 765001 1. OVERVIEW A USB Host System is composed...
129* callback from the URB will be called exactly once, when the USB core and 130* Host Controller Driver (HCD) are finished with the URB.When the completion 131* function is called, control of the URB is returned to the device 132* driver which issued the request.The completion handler...
927 static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, 928struct uhci_qh *qh) 929 { 930struct uhci_td *td; 931unsigned long destination, status; 932int maxsze = le16_to_cpu(qh->hep->desc.wMaxPacketSize); ...
4. 看到Kernel的config文件中的“CONFIG_USB_OHCI_HCD=m”、“CONFIG_USB_UHCI_HCD=m”、“CONFIG_USB_EHCI_HCD=m”、“CONFIG_USB_XHCI_HCD=m”等。 所以,这里就简单列一下各种xHCI(也包括真正的xHCI)的基本含义吧。 简单地讲,OHCI、UHCI都是USB1.1的接口标准,而EHCI是对应USB2.0的接口标准,最新的xHCI是...
4. 看到Kernel的config文件中的“CONFIG_USB_OHCI_HCD=m”、“CONFIG_USB_UHCI_HCD=m”、“CONFIG_USB_EHCI_HCD=m”、“CONFIG_USB_XHCI_HCD=m”等。 所以,这里就简单列一下各种xHCI(也包括真正的xHCI)的基本含义吧。 简单地讲,OHCI、UHCI都是USB1.1的接口标准,而EHCI是对应USB2.0的接口标准,最新的xHCI是...
VI编辑 .config，将以下几项由”y ” 改成 “m”CONFIG_USB_EHCI_HCD=m CONFIG_USB_OHCI_HCD=m CONFIG_USB_UHCI_HCD=m 重新编译安装即可。set
(Universal Serial Bus) 1.0 and 1.1 host controller that consists of two parts,(Host Controller Driver) and(Host Controller). The HCD software is responsible for scheduling the traffic on USB by posting and maintaining transactions in system memory. HCD is part of the system software, and ...
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