OpenUSB Developers Guide
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openusb_get_max_xfer_size

Name

openusb_get_max_xfer_size -- Get the maximum data transfer size per request based on the bus and type

Synopsis

int32_t openusb_get_max_xfer_size(openusb_handle_t handle, openusb_busid_t bus, openusb_transfer_type_t type, uint32_t * bytes);

Parameters

handle - Libusb handle.

bus - Bus ID.

type - Transfer type.

bytes - Max allowed size.

Description

openusb_get_max_xfer_size() gets the maximum transfer size that can be specified in openusb_request based on the which bus the target device is on and the desired transfer type. The size value is returned in bytes.

Return Value

openusb_get_max_xfer_size() returns OPENUSB_SUCCESS on success. Otherwise, a openusb error is returned.

OPENUSB_SUCCESS - No errors.

OPENUSB_INVALID_HANDLE - Invalid openusb handle.

OPENUSB_UNKNOWN_DEVICE - Bus idbus is not valid

OPENUSB_BADARG - type is not valid or bytes is NULL.

OPENUSB_NOT_SUPPORTED - Operation is not supported.

See Also

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openusb_get_lib_handleUpopenusb_get_configuration, openusb_set_configuration