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Write/Read Bulk communication process in KEXT. How?
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Write/Read Bulk communication process in KEXT. How?

  • Subject: Write/Read Bulk communication process in KEXT. How?
  • From: Chinki <email@hidden>
  • Date: Tue, 23 May 2006 19:23:27 +0530
Hello all,
 
Greetings!!!
 
Upon searching the archives, I found out that although this question has been posted but there has been NO Answer for the same till date.
 
 
I need to bulk write/read through my IO Driver (kext). Can any one explain how to use IOMemoryDescriptor ? Any sample example that illustrates the very simple communication.
 
I had done the following steps:
Get the Device, IOUSBDevice
Get the Interface, IOUSBInterface
Get the pipes, default, IN and OUT in our case
 
fOutPipe->Write(....,,,,,) // how to use ??? 
fInPipe->Read(,,,,,,,)// how to use ???
 
 
I had already gone through http://www.opensource.apple.com/darwinsource/10.4.6.ppc/  , but these samples donot serve the purpose.
 
 
( see for similar queries,,
How to handle variable length Bulk writes: IOMemoryDescriptor vs IOBufferMemoryDescriptor
http://lists.apple.com/archives/usb/2002/Feb/msg00117.html

Help needed in using IOMemoryDescriptor class
http://lists.apple.com/archives/usb/2002/Feb/msg00077.html

)

 

Again a basic level of communication sample would be of great help!

Your's sincerely,
Chinki
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