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About UsbIsocRead Issue on OS9.22(kUSBUnderRunErr!!!)

Subject: About UsbIsocRead Issue on OS9.22(kUSBUnderRunErr!!!)
From: "blacklee" <email@hidden>
Date: Thu, 26 Oct 2006 22:32:06 +0800
Delivered-to: email@hidden
Delivered-to: email@hidden

Dear All,

I am writing a USB video driver for Mac OS9.22。But I meet a problem about USBIsocRead fuction。

When use USBIsocRead function to read the ISO pipe，It was unsuccessful with return kUSBUnderRunErr status,and the usbPB->usbActCount=0。

I try to set the interface alternate setting and the usbPB->usbFrame parameter，But it seem not any effect。

I can find no way out! Anybody can point me why USBIsocRead return kUSBUnderRunErr,and what the kUSBUnderRunErr means.

How to Avoid unlimited USBIsocRead requests returning kUSBUnderRunErr.

Any advice will be appreciated!

Best Regards,

Black Lee

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