aardvark_py.py 文件源码

def aa_find_devices (devices):
    """usage: (int return, u16[] devices) = aa_find_devices(u16[] devices)

    All arrays can be passed into the API as an ArrayType object or as
    a tuple (array, length), where array is an ArrayType object and
    length is an integer.  The user-specified length would then serve
    as the length argument to the API funtion (please refer to the
    product datasheet).  If only the array is provided, the array's
    intrinsic length is used as the argument to the underlying API
    function.

    Additionally, for arrays that are filled by the API function, an
    integer can be passed in place of the array argument and the API
    will automatically create an array of that length.  All output
    arrays, whether passed in or generated, are passed back in the
    returned tuple."""

    if not AA_LIBRARY_LOADED: return AA_INCOMPATIBLE_LIBRARY
    # devices pre-processing
    __devices = isinstance(devices, int)
    if __devices:
        (devices, num_devices) = (array_u16(devices), devices)
    else:
        (devices, num_devices) = isinstance(devices, ArrayType) and (devices, len(devices)) or (devices[0], min(len(devices[0]), int(devices[1])))
        if devices.typecode != 'H':
            raise TypeError("type for 'devices' must be array('H')")
    # Call API function
    (_ret_) = api.py_aa_find_devices(num_devices, devices)
    # devices post-processing
    if __devices: del devices[max(0, min(_ret_, len(devices))):]
    return (_ret_, devices)


# Get a list of ports to which Aardvark devices are attached.
#
# This function is the same as aa_find_devices() except that
# it returns the unique IDs of each Aardvark device.  The IDs
# are guaranteed to be non-zero if valid.
#
# The IDs are the unsigned integer representation of the 10-digit
# serial numbers.