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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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The USBSetPipeActiveByReference function sets the state of a specified pipe to active.
OSStatus USBSetPipeActiveByReference(USBPipeRef ref);
The pipe status is set to active if the pipe is not stalled. The idle state is cleared, stalled is not.
Errors returned by the USBSetPipeActiveByReference function include:
kUSBUnknownPipeErr
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-6997 | pipe reference specified is unknown |
kUSBPipeIdleStalled
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-6979 | pipe was stalled, pipe is set idle |
In version 1.0 of the USB Services software, the following error is returned if the pipe was previously idle. In this instance the call has succeeded despite the returned error. This behavior is not an error and noErr is returned in versions 1.0.1 and later of the USB Services software.
kUSBPipeIdleErr
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-6980 | pipe was previously idle, pipe is still made active |
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