def from_bytes(cls, data):
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
assert msgid == MsgID.dev_dep_msg_in
transfer_size, transfer_attributes = struct.unpack_from('<LBxxx', data, 4)
data = data[12:]
return cls(msgid, btag, btaginverse, transfer_size, transfer_attributes, data)
def from_bytes(cls, data):
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
assert msgid == MsgID.dev_dep_msg_in
transfer_size, transfer_attributes = struct.unpack_from(
'<LBxxx', data, 4)
data = data[12:]
return cls(msgid, btag, btaginverse, transfer_size,
transfer_attributes, data)
def from_quirky(cls, data):
"""Constructs a correct response for quirky devices"""
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
data = data.rstrip(b'\x00')
# check whether it contains a ';' and if throw away the first 12 bytes
if ';' in str(data):
transfer_size, transfer_attributes = struct.unpack_from('<LBxxx', data, 4)
data = data[12:]
else:
transfer_size = 0
transfer_attributes = 1
return cls(msgid, btag, btaginverse, transfer_size, transfer_attributes, data)
def from_bytes(cls, data):
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
if msgid != MsgID.dev_dep_msg_in:
warnings.warn('Unexpected MsgID format. Consider updating the device\'s firmware. See https://github.com/pyvisa/pyvisa-py/issues/20')
return BulkInMessage.from_quirky(data)
transfer_size, transfer_attributes = struct.unpack_from('<LBxxx', data, 4)
# Truncate data to the specified length (discard padding).
data = data[12:12+transfer_size]
return cls(msgid, btag, btaginverse, transfer_size,
transfer_attributes, data)
def from_bytes(cls, data):
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
if msgid != MsgID.dev_dep_msg_in:
raise ValueError("Unexpected MsgID 0x{:02x}".format(msgid))
transfer_size, transfer_attributes = struct.unpack_from(
'<LBxxx', data, 4)
# Truncate data to the specified length (discard padding).
data = data[12:12 + transfer_size]
return cls(msgid, btag, btaginverse, transfer_size,
transfer_attributes, data)
def from_quirky(cls, data):
"""Constructs a correct response for quirky devices"""
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
data = data.rstrip(b'\x00')
# check whether it contains a ';' and if throw away the first 12 bytes
if ';' in str(data):
transfer_size, transfer_attributes = struct.unpack_from(
'<LBxxx', data, 4)
data = data[12:]
else:
transfer_size = 0
transfer_attributes = 1
return cls(msgid, btag, btaginverse, transfer_size,
transfer_attributes, data)
def from_bytes(cls, data):
msgid, btag, btaginverse = struct.unpack_from('BBBx', data)
if msgid != MsgID.dev_dep_msg_in:
warnings.warn(
'Unexpected MsgID format. Consider updating the device\'s firmware. See https://github.com/pyvisa/pyvisa-py/issues/20'
)
return BulkInMessage.from_quirky(data)
transfer_size, transfer_attributes = struct.unpack_from(
'<LBxxx', data, 4)
# Truncate data to the specified length (discard padding).
data = data[12:12 + transfer_size]
return cls(msgid, btag, btaginverse, transfer_size,
transfer_attributes, data)