[countOrRecData] = PsychHID(‘USBBulkTransfer’, usbHandle, endPoint, length [, outData][, timeOutMSecs=10000])
Performs a synchronous USB bulk transfer.
The function will automatically claim interface #0 to enable this transfer,
unless you call PsychHID(‘USBClaimInterface’, usbHandle, interfaceId) first to
claim a different interface ‘interfaceId’ for accessing the wanted endPoint.
The results of in-transfers are returned in ‘countOrRecData’ as an uint8() row
vector. The amount of actually received data can be less than the requested
‘length’. In case of an out-transfer, ‘countOrRecData’ reports the amount of
actual data sent.
‘usbHandle’ is the handle of the USB device to perform the transfer to or from.
‘endPoint’ is the USB end-point address: If its bit 7 is set, this requests an
in-transfer from device to host and ‘countOrRecData’ will contain at most
‘length’ bytes received from the device. Otherwise it requests an out-transfer
from host to device and ‘outData’ will be sent to the device.
‘length’ is the amount of data to return on an in-transfer. It is ignored for
‘outData’ is a uint8() data vector to send. It will be ignored for in-transfers.
‘timeOutMSecs’ is an optional timeout for the operation, in milliseconds.
Default is 10000 msecs. A value of zero means to never time out, but wait
indefinitely for transfer completion.
###See also: OpenUSBDevice USBClaimInterface USBControlTransfer USBInterruptTransfer