def _sendCommand(self, cmd):
"""
cmd (str): command to be sent to Power Control unit.
returns (str): answer received from the Power Control unit
raises:
IOError: if an ERROR is returned by the Power Control firmware.
"""
cmd = (cmd + "\n").encode('latin1')
with self._ser_access:
logging.debug("Sending command %s" % to_str_escape(cmd))
self._serial.write(cmd)
ans = b''
char = None
while char != b'\n':
char = self._serial.read()
if not char:
logging.error("Timeout after receiving %s",
to_str_escape(ans))
# TODO: See how you should handle a timeout before you raise
# an HWError
raise HwError(
"Power Control Unit connection timeout. "
"Please turn off and on the power to the box.")
# Handle ERROR coming from Power control unit firmware
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
ans = ans.decode('latin1')
if ans.startswith("ERROR"):
raise PowerControlError(ans.split(' ', 1)[1])
return ans.rstrip()
def _sendCommand(self, cmd):
"""
cmd (str): command to be sent to device (without the CR)
returns (str): answer received from the device (without \n or \r)
raises:
DPSSError: if an ERROR is returned by the device.
"""
cmd = cmd + "\r"
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd.encode('latin1'))
ans = b''
while ans[-2:] != b'\r\n':
char = self._serial.read()
if not char:
raise IOError("Timeout after receiving %s" %
to_str_escape(ans))
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
# TODO: check for other error answer?
# Normally the device either answers OK, or a value, for commands finishing with a "?"
if ans.startswith("Syntax error"):
raise DPSSError(ans)
return ans.decode('latin1').rstrip()
def _decodeMessage(self, msg):
'''
Decodes a message sent to the device and writes appropriate responses to
the output buffer.
msg: a string input message
'''
msg = msg.strip() # clean whitespace from message
if msg == b'': # Empty message
logging.warning('%s: Empty message received', self.name)
return
if msg == b":SYST:ERR?": # Error query
logging.debug('%s: Error state requested: %d', self.name,
self._error_state)
if self._error_state:
self._output_buffer += b'113,"Invalid command"\n'
else:
self._output_buffer += b'0,"No error"\n'
elif msg == b"*IDN?": # Request identifier command
self._output_buffer += b'SimRigol\n'
logging.debug('%s: Return identifier', self.name)
elif re.match(b":SOUR(1|2):FREQ?", msg):
self._output_buffer += b'%E\n' % (self._frequency, )
elif re.match(b":OUTP(1|2) ON", msg): # Channel 1 on command
self._error_state = False
logging.debug('%s: Set output on', self.name)
elif re.match(b":OUTP(1|2) OFF", msg): # Channel 1 off command
self._error_state = False
logging.debug('%s: Set output off', self.name)
elif re.match(b":SOUR(1|2):APPL:SQU",
msg): # Apply square wave command
# Try to unpack the command to see if the format is correct
try:
cmd, para = msg.split(b" ")
frequency, amplitude_pp, dc_bias, phase_shift = [
float(s) for s in para.split(b',')
]
self._frequency = frequency
logging.debug(
'%s: Set square wave %f Hz, %f Vpp, %f V bias, %f degrees',
self.name, frequency, amplitude_pp, dc_bias, phase_shift)
except TypeError: # could not unpack message
self._error_state = True
logging.exception('%s: Error Setting square wave %s',
self.name, to_str_escape(msg))
elif re.match(b":SOUR(1|2):FUNC:SQU:DCYC", msg): # Duty cycle setting
# Try to unpack the command to see if the format is correct
try:
cmd, para = msg.split(b" ")
logging.debug('%s: Setting duty cycle to %f %%', self.name,
float(para))
except TypeError: # could not unpack message
self._error_state = True
logging.exception('%s: Error Setting duty cycle %s', self.name,
to_str_escape(msg))
else:
self._error_state = True
logging.exception('%s: Error state set for message: %s', self.name,
to_str_escape(msg))
def _sendQuery(self, cmd):
"""
cmd (byte str): command to be sent to device
returns (str): answer received from the device
raise:
IOError if no answer is returned in time
"""
with self._net_access:
logging.debug("Sending: %s", to_str_escape(cmd))
self._socket.sendall(cmd + b'\r\n')
ans = b''
# TODO: Possibility that multiple replies will be contained within one packet
# Might have to add this functionality
while ans[-2:] != b"\r\n":
try:
ans += self._socket.recv(4096)
except socket.timeout:
# this is ok. Just means the server didn't send anything.
# Keep listening
logging.warning("Socket timeout on message %s",
to_str_escape(cmd))
logging.debug("Received: %s", to_str_escape(ans))
return ans.strip().decode("latin1")
def _sendQuery(self, cmd):
"""
cmd (byte str): command to be sent to device (without the LF, but with the ?)
returns (byte str): answer received from the device (without \n or \r)
raise:
IOError if no answer is returned in time
"""
cmd = cmd + b"\n"
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd)
self._serial.timeout = 1
ans = b''
while ans[-1:] != b'\n':
char = self._serial.read()
if not char:
raise IOError("Timeout after receiving %s" %
to_str_escape(ans))
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
time.sleep(0.05) # prevent overloading the device with messages
return ans.strip()
def _setValue(self, com, val=None):
"""
Write a value (str)
com (str): 3 characters command
val (None or str): value to set
raise:
IOError if problem decoding the answer or timeout
OXXError: if the device is unhappy (eg, unknown command, out of range)
"""
if val is None:
val = ""
ans = self.acc.sendCommand("%s%s%s" % (com, self._com_chan, val))
if not ans.startswith(com):
raise IOError("Expected answer to start with %s but got %s" %
(com, to_str_escape(ans)))
status = ans[len(com) + len(self._com_chan):]
if not status:
logging.warning("Answer too short after setting %s: %s", com,
to_str_escape(ans))
elif status[0] == "x":
raise OXXError("Failed to set %s to %s" % (com, val))
elif status[0] == ">":
pass
else:
logging.warning("Unexpected answer after setting %s: %s", com,
to_str_escape(ans))
def sendCommand(self, com):
"""
Send a command which does not expect any report back
com (string): command to send (not including the ? and the \r)
return (string): the report without prefix ("!") nor carriage return.
"""
assert (len(com) <= 50)
full_com = ("?" + com + "\r").encode('latin1')
logging.debug("Sending: '%s'", to_str_escape(full_com))
self._serial.write(full_com)
# ensure everything is received, before expecting an answer
self._serial.flush()
# Read lines per line until it's an answer (!)
while True:
line = self.readMessage()
if line[0] == "$": # ad-hoc message => we don't care
logging.debug("Skipping ad-hoc message '%s'",
to_str_escape(line))
else:
break
if not line[0] == "!":
raise IOError("Answer prefix (!) not found.")
if line.startswith("!UK"): # !UK or !UK[n]
raise OXXError("Unknown command (%s)." % to_str_escape(com))
return line[1:]
def _sendCommand(self, cmd):
"""
cmd (byte str): command to be sent to PMT Control unit.
returns (byte str): answer received from the PMT Control unit
raises:
PMTControlError: if an ERROR is returned by the PMT Control firmware.
HwError: in case the of connection timeout
"""
cmd = cmd + b"\n"
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
try:
self._serial.write(cmd)
except IOError:
logging.warn("Failed to send command to PMT Control firmware, "
"trying to reconnect.")
if self._recovering:
raise
else:
self._tryRecover()
# send command again
logging.debug(
"Sending command %s again after auto-reconnect" %
to_str_escape(cmd))
return self._sendCommand(cmd[:-1]) # cmd without \n
ans = b''
char = None
while char != b'\n':
try:
char = self._serial.read()
except IOError:
logging.warn("Failed to read from PMT Control firmware, "
"trying to reconnect.")
if self._recovering:
raise
else:
self._tryRecover()
# don't send command again
raise IOError(
"Failed to read from PMT Control firmware, "
"restarted serial connection.")
if not char:
logging.error("Timeout after receiving %s",
to_str_escape(ans))
# TODO: See how you should handle a timeout before you raise
# an HWError
raise HwError(
"PMT Control Unit connection timeout. "
"Please turn off and on the power to the box.")
# Handle ERROR coming from PMT control unit firmware
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
if ans.startswith(b"ERROR"):
raise PMTControlError(ans.split(b' ', 1)[1])
return ans.rstrip()
def _parseMessage(self, msg):
"""
msg (str): the message to parse (without the \r)
return None: self._output_buf is updated if necessary
"""
logging.debug("SIM: parsing %s", to_str_escape(msg))
m = re.match(br"(?P<com>\*?[A-Za-z:]+\??)\W*(?P<args>.*)", msg)
if not m:
logging.error("Received unexpected message %s", msg)
return
com = m.group("com").upper()
if m.group("args"):
args = m.group("args").strip()
else:
args = None
logging.debug("SIM: decoded message as %s %s", to_str_escape(com), args)
# decode the command
if com == b"*IDN?":
self._sendAnswer(b"KEITHLEY INSTRUMENTS INC.,MODEL 6485,123456,C01 Sep 27 2017 12:22:00/A02 /J")
elif com == b"*CLS":
pass
elif com == b"*STB?":
self._sendAnswer(b"0") # It's all fine
elif com == b"STAT:QUE?":
if not self._errorq:
self._sendAnswer(b"0,\"No error\"")
else:
err = self._errorq.pop(0)
self._sendAnswer(b"%d,\"Error %d\"" % (err, err))
elif com == b"CONF:CURR":
pass
elif com == b":CURR:RANG:AUTO":
pass
elif com == b"SYST:LFR?":
self._sendAnswer(b"%g" % self._lfr)
elif com == b":NPLC?":
self._sendAnswer(b"%g" % self._nplc)
elif com == b":NPLC":
if not args:
self._addError(6)
else:
self._nplc = float(args)
elif com in (b"MEAS:CURR?", b"READ?"):
dur = (self._nplc / self._lfr) * 3 + 0.01
time.sleep(dur)
ts = time.time() - self._time_start
val = random.uniform(-1e-9, 1e-9)
self._sendAnswer(b"%EA,%E,%E" % (val, ts, 0))
else:
logging.warning(b"SIM: Unsupported instruction %s", to_str_escape(com))
# TODO: add an error to the queue
self._addError(1)
def _sendCommand(self, cmd):
"""
:param cmd: (bytes) command to be sent to the hardware
:returns: (str) response
"""
cmd += EOL
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
try:
self._serial.write(cmd)
# TODO: what kind of exception is raised? Needs to be more specific.
except:
logging.warning("Failed to read from PMT Control firmware, "
"trying to reconnect.")
if self._recovering:
raise
else:
self._tryRecover()
# don't send command again
raise IOError("Failed to read from PMT Control firmware, "
"restarted serial connection.")
resp = b""
while resp[-len(EOL):] != EOL:
try:
char = self._serial.read()
# TODO: what kind of exception is raised? Needs to be more specific.
except:
logging.warning("Failed to read from PMT Control firmware, "
"trying to reconnect.")
if self._recovering:
raise
else:
self._tryRecover()
# don't send command again
raise IOError("Failed to read from PMT Control firmware, "
"restarted serial connection.")
if not char:
raise IOError("Timeout after receiving %s" % to_str_escape(resp))
else:
resp += char
logging.debug("Received response %s", to_str_escape(resp))
# Check response (command should be echoed back)
if not resp.startswith(cmd[:-len(EOL)-1]):
raise IOError("Response starts with %s != %s" % (to_str_escape(resp[:len(cmd)]), cmd))
if b"_??_" in resp:
raise ValueError("Received response %s, command %s not understood." % (to_str_escape(resp), cmd))
if b"!" in resp:
raise PMDError(0, to_str_escape(resp))
# Format:
# * for query with response: <cmd>:<ret><EOL> (will return <ret>)
# * for set command without response: <cmd><EOL> (will return "")
return resp[len(cmd) + 1 - len(EOL):-len(EOL)].decode("latin1")
def _SendCmd(self, cmd):
"""
Send query/order to device
cmd: valid query command for Remcon SEM
returns str if successful, otherwise raises error
"""
cmd = cmd + self.eol
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd)
# Acknowledge
ack = self._serial.read() # valid/invalid
if ack not in (RS_VALID, RS_INVALID):
raise IOError(
"Acknowledge sign is expected, received '%s' instead." %
ack)
ans = ack
# EOL
while ans[-len(self.eol):] != self.eol:
char = self._serial.read()
if not char:
raise IOError("Timeout after receiving %s" %
to_str_escape(ans))
else:
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
# Status
stat = self._serial.read() # Success/fail
ans = stat
# Value
while ans[-len(self.eol):] != self.eol:
char = self._serial.read()
if not char:
raise IOError("Timeout after receiving %s" %
to_str_escape(ans))
else:
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
value = ans[1:-len(self.eol)]
if stat == RS_SUCCESS:
return value
elif stat == RS_FAIL:
raise RemconError(
int(value),
"Error %s after receiving command %s." % (int(value), cmd))
else:
raise IOError(
"Status sign is expected, received '%s' instead." % stat)
def sendQueryCommand(self, cmd):
"""
Sends one command, and expect a reply
cmd (str): command to send, including the ?
returns:
ans (str): response of the driver
raises:
IOError: if problem with sending/receiving data over the connection
"""
if not self._is_connected:
raise IOError("Device %s not connected." % (self._host, ))
msg = ("%s\n" % cmd).encode('ascii')
logging.debug("Sending command %s", to_str_escape(msg))
with self._net_access:
self.socket.sendall(msg)
# read the answer
end_time = time.time() + 0.5
ans = b""
while True:
try:
data = self.socket.recv(4096)
except socket.timeout:
raise IOError("Controller %s timed out after %s" %
(self._host, to_str_escape(msg)))
if not data:
logging.debug("Received empty message")
ans += data
# does it look like we received a full answer?
if b"\n" in ans:
break
if time.time() > end_time:
raise IOError("Controller %s timed out after %s" %
(self._host, to_str_escape(msg)))
time.sleep(0.01)
logging.debug("Received: %s", to_str_escape(ans))
ans, left = ans.split(b"\n", 1) # remove the end of line characters
if left:
logging.error("Received too much data, will discard the end: %s",
to_str_escape(left))
ans = ans.decode('latin1')
return ans
def _ReadMessage(self, timeout=None):
"""
Reads the next message
timeout (0 < float): maximum time to wait for the message
return:
mid (int): message ID
data (bytes): bytes 3&4 or the data of the message
raise:
IOError: if failed to send or receive message
"""
old_timeout = self._serial.timeout
if timeout is not None:
# Should be only for the first byte, but doing it for the first 6
# should rarely matter
self._serial.timeout = timeout
try:
# read the first (required) 6 bytes
msg = b""
for i in range(6):
char = self._serial.read() # empty if timeout
if not char:
raise IOError(
"Controller timed out, after receiving '%s'" %
to_str_escape(msg))
msg += char
finally:
self._serial.timeout = old_timeout
mid = struct.unpack("<H", msg[0:2])[0]
if not (ord(msg[4:5]) & 0x80): # short message
logging.debug("Received: '%s'",
", ".join("%02X" % c for c in bytearray(msg)))
return mid, msg[2:4]
# long message
length = struct.unpack("<H", msg[2:4])[0]
for i in range(length):
char = self._serial.read() # empty if timeout
if not char:
raise IOError("Controller timed out, after receiving '%s'" %
to_str_escape(msg))
msg += char
logging.debug("Received: '%s'",
", ".join("%02X" % c for c in bytearray(msg)))
return mid, msg[6:]
def GetSpecInfo(self):
"""
Return:
wavelength (float): in meters
power (float): theoretical maximum power (W)
subdev (set of int): subdevices available
"""
ans = self._getValue("GSI")
# Expects something like:
# GSI [m63] (optional) int (wl in nm) § int (power in mW)
try:
m = re.match(r"(\[m(?P<mdev>\d+)])?(?P<wl>\d+)\xa7(?P<power>\d+)",
ans)
mdev = m.group("mdev")
if mdev is None:
mdev = 0 # None if no mdev bitmask
else:
mdev = int(mdev)
wl = int(m.group("wl")) * 1e-9 # m
power = int(m.group("power")) * 1e-3 # W
except Exception:
raise ValueError("Failed to decode spec info answer '%s'" %
to_str_escape(ans))
# Convert the bitmask into a set of int
subdev = set()
n = 1
while mdev:
if mdev & 0x1:
subdev.add(n)
n += 1
mdev >>= 1
return wl, power, subdev
def readMessage(self):
"""
Reads one message from the device (== any character until \r)
return str: the message (raw, without the ending \r)
raise: IOError in case of timeout
"""
line = b""
char = self._serial.read() # empty if timeout
while char and char != b"\r":
# FIXME: it seems that flushing the input doesn't work. It's
# still possible to receives 0's at the beginning.
# This is a kludge to workaround that
if not line and char == b"\x00":
logging.debug("Discarding null byte")
char = b""
# normal char
line += char
char = self._serial.read()
logging.debug("Received: '%s'", to_str_escape(line))
# Check it's a valid answer
if not char: # should always finish by a "\r"
raise IOError("Controller timeout.")
return line.decode('latin1')
def _listen(self):
'''
This method runs in a separate thread and listens for messages sent to the device via IP sockets
'''
# Listen for incoming connections
self.socket.listen(1)
while not self._shutdown_flag.is_set():
# Wait for a connection
logging.debug('%s: Waiting for a connection', self.name)
connection, client_address = self.socket.accept() # this function blocks until a connection is received.
try:
logging.debug('%s: Connection from : %s', self.name, client_address)
# Receive the data in small chunks and retransmit it
while True:
data = connection.recv(4096) # read from the socket
if data:
data = data.strip()
# determine a command
for line in data.splitlines():
logging.debug('%s: Received: %s' % (self.name, to_str_escape(line)))
self._decodeMessage(line)
time.sleep(0.105) # wait a little before responding
self._sendBuffer(connection)
else:
# no more data to receive
break
finally:
# Clean up the connection
connection.close()
def _sendOrder(self, cmd):
"""
cmd (str): command to be sent to device (without the CR)
"""
cmd = (cmd + "\r").encode('ascii')
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd)
def _sendOrder(self, cmd):
"""
cmd (byte str): command to be sent to device (without the CR)
"""
cmd = cmd + b"\r"
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd)
def _sendQuery(self, com):
"""
Send a command which expects an answer
com (byte string): command to send (not including the ? and the \r)
return (byte string): the answer without newline and suffix ("> ")
raises
IOError: if there is a timeout
TLFWError: if the hardware reports an error
"""
# TODO: handle IOError and automatically try to reconnect (cf LLE)
assert isinstance(com, bytes), 'com argument needs to be a byte string'
assert (len(com) <= 50) # commands cannot be long
full_com = com + b"\r"
with self._ser_access:
logging.debug("Sending: '%s'", to_str_escape(full_com))
self._serial.write(full_com)
# ensure everything is received, before expecting an answer
self._serial.flush()
# Read until end of answer
line = b""
while True:
char = self._serial.read() # empty if timeout
if not char: # should always finish by a "> "
raise IOError("Controller timeout, after receiving '%s'" %
to_str_escape(line))
# normal char
line += char
if line[-2:] == b"> ":
break
logging.debug("Received: '%s'", to_str_escape(line))
# remove echo + suffix + new line
line = line[len(full_com):-2].rstrip(b"\r")
# if it's an error message => raise an error
m = re.match(self.re_err, line)
if m:
err = m.group(1)
raise TLFWError("Device rejected command '%s': %s" % (com, err))
return line
def _processCommand(self, com):
"""
process the command, and put the result in the output buffer
com (str): command
"""
logging.debug("Simulator received command %s", to_str_escape(com))
out = None
try:
if com == b"*idn?":
out = b"THORLABS FW102C/FW212C Fake Filter Wheel version 1.01"
elif com.endswith(b"?"):
name = com[:-1]
val = self._state[name]
out = b"%d" % val
elif com.startswith(b"pos="):
val = int(com[4:])
if not 1 <= val <= self._state[b"pcount"]:
raise ValueError("%d" % val)
# simulate a move
curpos = self._state[b"pos"]
p1, p2 = sorted([val, curpos])
dist = min(p2 - p1, (6 + p1) - p2)
if self._state[b"speed"] == 0:
dur = 2
else:
dur = 1
time.sleep(dist * dur)
self._state[b"pos"] = val
# no output
else:
# TODO: set of speed, trig, sensors,
logging.debug("Command '%s' unknown", to_str_escape(com))
raise KeyError("%s" % to_str_escape(com))
except ValueError:
out = b"Command error CMD_ARG_INVALID\n"
except KeyError:
out = b"Command error CMD_NOT_DEFINED\n"
# add the response end
if out is None:
out = b""
else:
out += b"\r"
out += b"> "
self._output_buf += out
def _sendGetCommand(self, com, prefix="", suffix="\r\n\x03"):
# Should normally never be called
assert (len(com) <= 10)
assert (len(prefix) <= 2)
com = com.encode('latin1')
logging.debug("Sending: %s", to_str_escape(com))
self.serial.write(com)
return ""
def _parseMessage(self, msg):
"""
msg (str): the message to parse (without the \r)
return None: self._output_buf is updated if necessary
"""
logging.debug("SIM: parsing %s", to_str_escape(msg))
msg = msg.decode(
"latin1").strip() # remove leading and trailing whitespace
msg = "".join(msg.split()) # remove all space characters
if msg == "*ESR?": # error status register
self._sendAnswer(b"%d" % (self._status_byte, ))
elif msg == "*CLS":
self._status_byte = POWER_ON
elif msg == "*IDN?":
self._sendAnswer(b"LSCI,MODEL335,fake,0.0")
elif re.match('LOCK', msg):
pass
# Query setpoint
elif re.match('SETP\?', msg):
self._sendAnswer(b"+%.3f" % (self._setpoint, ))
# set setpoint
elif re.match("SETP", msg):
vals = msg[4:].split(',')
self._setpoint = float(vals[1])
# Query heating range
elif re.match('RANGE\?', msg):
self._sendAnswer(b"%d" % (self._heating, ))
# set heating range
elif re.match("RANGE", msg):
vals = msg[5:].split(',')
self._heating = int(vals[1])
# Query temperature
elif re.match('KRDG\?', msg):
# send temperature with some noise
if os.path.exists(
os.path.join(model.BASE_DIRECTORY, "temp_increase.txt")):
logging.info(
"Simulator set to increase temperature by 1 deg each reading"
)
self._temperature += 1
self._sendAnswer(b"+%.3f" % (self._temperature))
else:
self._sendAnswer(
b"+%.3f" %
(self._temperature + random.uniform(-0.1, 0.1), ))
if self._heating:
if self._temperature < self._setpoint: # heating is enabled
self._temperature += 0.05 * self._heating # simulate heating
else:
self._temperature -= 0.1
else: # no heating so no temperature control
# maintain stable temperature
if self._temperature > STABLE_TEMPERATURE:
self._temperature -= 0.1 # cool off with no heating
else:
self._status_byte |= COMMAND_ERROR
def _sendBuffer(self, connection):
'''
Transmit the contents of the output buffer over the connection
connection: an active accepted socket connection
'''
if self._output_buffer: # check if there is data in the buffer
connection.sendall(self._output_buffer)
logging.debug('%s: Sending transmission: %s', self.name,
to_str_escape(self._output_buffer))
self._output_buffer = b'' # clear the buffer
def _sendGetCommand(self, com, prefix="", suffix="\r\n\x03"):
"""
Send a command and return its report
com (string): the command to send
prefix (string): the prefix to the report,
it will be removed from the return value
suffix (string): the suffix of the report. Read will continue until it
is found or there is a timeout. It is removed from the return value.
return (string): the report without prefix nor newline
"""
assert (len(com) <= 10)
assert (len(prefix) <= 2)
com = com.encode('latin1')
logging.debug("Sending: %s", to_str_escape(com))
self.serial.write(com)
char = self.serial.read() # empty if timeout
report = char
while char and not report.endswith(suffix):
char = self.serial.read()
report += char
if not char:
if not self._try_recover:
raise IOError("PI controller %d timeout." % self.address)
success = self.recoverTimeout()
if success:
logging.warning("PI controller %d timeout, but recovered.",
self.address)
# TODO try to send again the command
else:
raise IOError("PI controller %d timeout, not recovered." %
self.address)
logging.debug("Receive: %s", to_str_escape(report))
if not report.startswith(prefix):
raise IOError("Report prefix unexpected after '%s': '%s'." %
(com, report))
report = report.decode(
'latin1') if sys.version_info[0] >= 3 else report
return report.lstrip(prefix).rstrip(suffix)
def recv(self, size=1):
if not self._output_buf:
# simulate timeout
time.sleep(self.timeout)
raise socket.timeout("No data after %g s" % (self.timeout,))
ret = self._output_buf[:size]
self._output_buf = self._output_buf[len(ret):]
logging.debug("SIM: Sending %s", to_str_escape(ret))
return ret
def _sendSetCommand(self, com):
"""
Send a command which does not expect any report back
com (string): command to send (including the \r if necessary)
"""
for sc in com.split(","):
assert (len(sc) < 10)
com = com.encode('latin1')
logging.debug("Sending: %s", to_str_escape(com))
self.serial.write(com)
def _flushInput(self):
"""
Ensure there is no more data queued to be read on the bus (=serial port)
"""
with self._ser_access:
self._serial.flush()
self._serial.flushInput()
# Shouldn't be necessary, but just in case
skipped = self._serial.read(1000) # More than 1000 chars => give up
logging.debug("Skipping input %s", to_str_escape(skipped))
def flushInput(self):
"""
Ensure there is no more data queued to be read on the bus (=serial port)
"""
self._serial.flush()
self._serial.flushInput()
while True:
data = self._serial.read(100)
if len(data) < 100:
break
logging.debug("Flushing data %s", to_str_escape(data))
def IsMotionDone(self, axis):
"""
Check whether the axis is in motion
axis (1<=int<=4): axis number
return (bool): False if in motion, True if motion is finished
"""
resp = self._sendQueryCommand(b"MD", axis=axis)
if resp == b"0": # motion in progress
return False
elif resp == b"1": # no motion
return True
else:
raise IOError("Failed to decode answer about motion '%s'" %
to_str_escape(resp))
def _sendQuery(self, cmd):
"""
cmd (byte str): command to be sent to device (without the CR, but with the ?)
returns (str): answer received from the device (without \n or \r)
raise:
IOError if no answer is returned in time
"""
cmd = cmd + b"\r"
with self._ser_access:
logging.debug("Sending command %s", to_str_escape(cmd))
self._serial.write(cmd)
self._serial.timeout = 1
ans = b''
while ans[-1:] != b'\r':
char = self._serial.read()
if not char:
raise IOError("Timeout after receiving %s" %
to_str_escape(ans))
ans += char
logging.debug("Received answer %s", to_str_escape(ans))
return ans.strip().decode("latin1")