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helium_compressor.py
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helium_compressor.py
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import serial
import serial.tools.list_ports
import time
import sys
from threading import Thread
import crcmod
import crcmod.predefined
import sounddevice as sd
def hex2bits(hex_str):
state = [0 for i in range(len(hex_str) * 4)];
i = 0
hex_str = hex_str.upper()
for char in hex_str:
c = char.encode('ascii')[0]
if c < b'0'[0] or (c > b'9'[0] and c < b'A'[0]) or c > b'F'[0]:
raise ValueError('invalid character %c in %s' % (char, hex_str))
return
if c >= b'A'[0]:
c -= b'A'[0]
if c >= b'0'[0]:
c -= b'0'[0]
for j in range(len(hex_str)):
if (c & (1 << j)) != 0:
state[len(hex_str) * 4 - 4 * (i + 1) + j] = 1
i += 1
return state
def sine_tone(frequency, duration, volume=1, sample_rate=44100):
n_samples = int(sample_rate * duration)
t = np.arange(n_samples) / sample_rate
sd.play(volume * np.sin(2 * np.pi * frequency * t),
samplerate=sample_rate,
blocking=True,
device='sysdefault')
def snd_notify():
for i in range(30):
sine_tone(3135.96, 0.2)
#sine_tone(2093.00, 0.2)
sd.sleep(200)
def snd_warning():
for i in range(4):
sine_tone(2093.00, 0.2)
sine_tone(1760.00, 0.2)
class worker(Thread):
crc16 = crcmod.predefined.Crc('modbus')
def __init__(self):
Thread.__init__(self)
self.daemon = True
self.ser = serial.Serial()
self.communicating = False
self.temperatures = [None, None, None, None]
self.pressures = [None, None]
self.config_mode = None
self.local_on = None
self.cold_head_run = None
self.cold_head_pause = None
self.fault_off = None
self.oil_fault_off = None
self.solenoid_on = None
self.pressure_off = None
self.oil_level_alarm = None
self.water_flow_alarm = None
self.water_temperature_alarm = None
self.helium_temperature_off = None
self.mains_off = None
self.motor_temperature_off = None
self.system_on = None
# self.open_serial()
def _block(self):
i = 0
while self.communicating:
time.sleep(0.1)
i += 1
if i > 30: # wait for 3 seconds at most
print("compressor is very busy")
return False
return True
def open_serial(self):
self.communicating = False
ports = serial.tools.list_ports.comports()
for port in ports:
if port.description == "ttyAMA0":
continue
if port.vid == 0x0403 and port.pid == 0x6001:
self.ser.port = port.device
self.ser.baudrate = 9600
self.ser.parity = serial.PARITY_NONE
self.ser.bytesize = serial.EIGHTBITS
self.ser.timeout = 1
self.ser.write_timeout = 1
try:
self.ser.open()
except:
time.sleep(1) # to be changed
else:
print(self.ser.port, "opened for the helium compressor")
self.communicating = False
break
if not self.ser.is_open:
time.sleep(1)
def read_temperatures(self):
if not self._block():
return False
cmd = "$TEA"
while self.ser.is_open:
crc = self.crc16.new(cmd.encode('ascii'))
msg = cmd + crc.hexdigest() + '\r'
try:
self.communicating = True
self.ser.write(msg.encode('ascii'))
self.ser.flush()
c = self.ser.read(26)
self.ser.flush()
self.communicating = False
except serial.serialutil.SerialException:
self.communicating = False
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
# debug
if len(c) == 0:
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
resp = c.decode("ascii").split(',')
if resp[0] == "$???":
continue
if len(resp) != 6 or resp[0] != cmd:
self.temperatures = [None, None, None, None]
print('wrong response:', c)
return False
crc = self.crc16.new(c[:21])
if crc.hexdigest() != resp[-1][:4]:
self.temperatures = [None, None, None, None]
print('wrong crc:', c)
return False
for i in range(len(self.temperatures)):
self.temperatures[i] = int(resp[i+1])
break
else:
self.open_serial()
return True
def read_pressures(self):
if not self._block():
return False
cmd = "$PRA"
while self.ser.is_open:
crc = self.crc16.new(cmd.encode('ascii'))
msg = cmd + crc.hexdigest() + '\r'
try:
self.communicating = True
self.ser.write(msg.encode('ascii'))
self.ser.flush()
c = self.ser.read(18)
self.ser.flush()
self.communicating = False
except serial.serialutil.SerialException:
self.communicating = False
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
# debug
if len(c) == 0:
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
resp = c.decode("ascii").split(',')
if resp[0] == "$???":
continue
if len(resp) != 4 or resp[0] != cmd:
self.pressures = [None, None]
return False
crc = self.crc16.new(c[:13])
if crc.hexdigest() != resp[-1][:4]:
self.pressures = [None, None]
return False
for i in range(len(self.pressures)):
self.pressures[i] = int(resp[i+1])
break
else:
self.open_serial()
return True
def read_status(self):
if not self._block():
return False
cmd = "$STA"
while self.ser.is_open:
crc = self.crc16.new(cmd.encode('ascii'))
msg = cmd + crc.hexdigest() + '\r'
try:
self.communicating = True
self.ser.write(msg.encode('ascii'))
self.ser.flush()
c = self.ser.read(15)
self.ser.flush()
self.communicating = False
except serial.serialutil.SerialException:
self.communicating = False
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
# debug
if len(c) == 0:
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
resp = c.decode("ascii").split(',')
if resp[0] == "$???":
continue
if len(resp) != 3 or resp[0] != cmd:
self.pressures = [None, None]
return False
crc = self.crc16.new(c[:10])
if crc.hexdigest() != resp[-1][:4]:
self.pressures = [None, None]
return False
# normally resp[1] == "0301"
state = hex2bits(resp[1])
state_number = state[9] + (state[10] << 1) + (state[11] << 2)
self.config_mode = state[15]
self.local_on = bool(state_number == 1)
self.cold_head_run = bool(state_number == 4)
self.cold_head_pause = bool(state_number == 5)
self.fault_off = bool(state_number == 6)
self.oil_fault_off = bool(state_number == 7)
self.solenoid_on = bool(state[8])
self.pressure_off = bool(state[7])
self.oil_level_alarm = bool(state[6])
self.water_flow_alarm = bool(state[5])
self.water_temperature_alarm = bool(state[4])
self.helium_temperature_off = bool(state[3])
self.mains_off = bool(state[2])
self.motor_temperature_off = bool(state[1])
self.system_on = bool(state[0])
break
else:
self.open_serial()
return True
def turn(self, action):
if int(action) == 0:
return self.do("$OFF")
elif int(action) == 1:
return self.do("$ON1")
else:
print("invalid action:,", repr(action))
return False
def do(self, cmd):
if not self._block():
return False
while self.ser.is_open:
self.communicating = True
crc = self.crc16.new(cmd.encode('ascii'))
msg = cmd + crc.hexdigest() + '\r'
try:
self.ser.write(msg.encode('ascii'))
self.ser.flush()
c = self.ser.read(10)
self.ser.flush()
except serial.serialutil.SerialException:
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
# debug
if len(c) == 0:
self.ser.close()
print('restarting ' + self.ser.port)
time.sleep(1)
self.open_serial()
continue
resp = c.decode("ascii").split(',')
if resp[0] == "$???":
continue
if len(resp) != 2 or resp[0] != cmd:
continue
# self.communicating = False
# return False
crc = self.crc16.new(c[:5])
if crc.hexdigest() != resp[-1][:4]:
continue
# self.communicating = False
# return False
self.communicating = False
break
else:
self.open_serial()
self.communicating = False
return True
def run(self):
while True:
try:
self.read_temperatures()
self.read_pressures()
self.read_status()
time.sleep(1)
except (KeyboardInterrupt, SystemExit):
self.communicating = False
print('caught ctrl+c')
self.join()
sys.exit(0)