def build_array(btag, eom, chunk):
size = len(chunk)
return (struct.pack('BBBx', MsgID.dev_dep_msg_out, btag,
~btag & 0xFF) +
struct.pack("<LBxxx", size, eom) +
chunk +
b'\0' * ((4 - size) % 4))
def build_array(btag, eom, chunk):
size = len(chunk)
return (struct.pack('BBBx', MsgID.dev_dep_msg_out, btag,
~btag & 0xFF) +
struct.pack("<LBxxx", size, eom) +
chunk +
b'\0' * ((4 - size) % 4))
def build_array(btag, transfer_size, term_char=None):
"""
:param transfer_size:
:param btag:
:param term_char:
:return:
"""
if term_char is None:
transfer_attributes = 0
term_char = 0
else:
transfer_attributes = 2
return struct.pack('BBBx', MsgID.request_dev_dep_msg_in, btag, ~btag & 0xFF) + \
struct.pack("<LBBxx", transfer_size, transfer_attributes, term_char)
def build_array(btag, transfer_size, term_char=None):
"""
:param transfer_size:
:param btag:
:param term_char:
:return:
"""
if term_char is None:
transfer_attributes = 0
term_char = 0
else:
transfer_attributes = 2
return struct.pack('BBBx', MsgID.request_dev_dep_msg_in, btag, ~btag & 0xFF) + \
struct.pack("<LBBxx", transfer_size, transfer_attributes, term_char)
def _sendrecord(sock, record, fragsize=None, timeout=None):
logger.debug('Sending record through %s: %r', sock, record)
if timeout is not None:
r, w, x = select.select([], [sock], [], timeout)
if sock not in w:
msg = ("socket.timeout: The instrument seems to have stopped "
"responding.")
raise socket.timeout(msg)
last = False
if not fragsize:
fragsize = 0x7fffffff
while not last:
record_len = len(record)
if record_len <= fragsize:
fragsize = record_len
last = True
if last:
fragsize = fragsize | 0x80000000
header = struct.pack(">I", fragsize)
sock.send(header + record[:fragsize])
record = record[fragsize:]
def sendfrag(sock, last, frag):
x = len(frag)
if last:
x = x | 0x80000000
header = struct.pack(">I", x)
sock.send(header + frag)
def sendfrag(sock, last, frag):
x = len(frag)
if last:
x = x | 0x80000000
header = struct.pack(">I", x)
sock.send(header + frag)
