WINCE USB Research

最新推荐文章于 2019-10-07 00:00:36 发布

TheGameIsFives

最新推荐文章于 2019-10-07 00:00:36 发布

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文章标签： wince struct object class function thread

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本文概述了OHCI(开放主机控制器接口)与WinCEUSB架构的关系，详细介绍了OHCI设备初始化流程、根集线器创建过程及状态变化监测线程的工作原理，并解释了相关代码结构。

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浏览了一下OHCI代码和WINCE USB构架，总结一下，怕以后忘记了。

host ----- function

client driver (Mass storage, rndis...) ----- client driver(Mass storage, rndis...)

controller driver(OHCI,UHCI...) ----- controller driver(ufn ctrolller)

controller find usb hardware device and load client driver.

Bus manage and service drivers under bus

About OHCI:

MDD

entery : hcddrv.cpp --> hcd_init hcd_open ...

PDD

entery: s3c6410_ohci.c -->HcdPdd_Init HcdPdd_Open ...

Cdevice.cpp:

// This file manages the USB devices

// CDevice (ADT)

// / /

// CFunction CHub (ADT)

// / /

// CRootHub CExternalHub

We Create CRootHub when init in HcdMdd_CreateHcdObject()--->Create a COhcd object-->call COhcd::DeviceInitialize()-->

CRootHub::EnterOperationalState() create a HubStatusChangeThreadStub to run for detect hubport state change

---> in the thread we call WaitForPortStatusChange() to get if any port state change go on to AttachDevice() , if

no port state change check if there is no device on the port suspend the port and go on WaitForPortStatusChange()....

Notes: the port state is defined in OHCI registers , we read the register in WaitForPortStatusChange() funciton

Others about code:

CHW.cpp:

class CHW : public CHcd ---> class CHcd : public LockObject, public CDeviceGlobal

Cohcd.cpp:

class COhcd : public CHW, public CHCCAera

when Cohcd::DeviceInitialize() is called by HcdMdd_CreateHcdObject() when driver init,we create a root hub and

set it to m_pCRootHub by CHcd::SetRootHub()

the hcd_init function return a SOhcdPdd struct object and the struct is initialized in HcdPdd_Init,

SOhcdPdd::lpvOhcdMddObject = pobOhcd(this is the Cohcd object we created ).when we call

hcd_poweron or hcd_deinit and etc , the struct object will be send for us to use.