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develop USB modem driver with AppleUSBCDCDriver



Hi,
 
I am new to write USB modem driver on MAC.
There is a USB modem i would like to use it with my MacBook.
I downloaded and modified the sample code AppleUSBCDCDriver319.4.1,
but my USB modem couldn't be used when it was pluged into the USB port.
 
I inserted a new item(child) into the IOKitPersonalities of the AppleUSBCDC-Info.plist file,
includes the idProduct and idVendor of my USB modem.
I filled in the IOClass with 'AppleUSBMergeNub' for this new item, and I set the IOProviderClass as 'IOUSBInterface'.
 
Should I changed the IOClass from 'AppleUSBMergeNub' to 'IOUSBDevice' ?
Which driver can I use for the USB modem? the AppleUSBCDCDriver or only the AppleUSBCDCDeviceACM?
 
Thanks.
Sharn
 
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