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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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The USBSetPipeIdleByReference function sets a specified pipe to the idle state. This call can be used only on a specified pipe, not on a device's default pipe 0.
OSStatus USBSetPipeIdleByReference(USBPipeRef ref);
The state of the pipe is set to idle. No outstanding transactions are affected.
Errors returned by the USBSetPipeIdleByReference function include:
kUSBUnknownPipeErr
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-6997 | pipe reference specified is unknown |
In version 1.0 of the USB Services software, the following errors are returned if the pipe is not currently active. In these instances, 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.
kUSBPipeIdleStalled
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-6979 | pipe was stalled, pipe is still active despite error |
kUSBPipeIdleErr
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-6980 | specified pipe is in the idle state |
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