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vacuum_pump.py
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vacuum_pump.py
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import serial
import serial.tools.list_ports
import time
import sys
from threading import Thread
class worker(Thread):
true = 0x31
false = 0x30
parameter_pump_on = b'000'
parameter_status = b'205'
parameter_speed_hz = b'203'
def __init__(self):
Thread.__init__(self)
self.ser = serial.Serial()
self.address = 0
self.pumping = None
self.speed = None
self.communicating = False
self.daemon = True
# self.open_serial()
def _checksum(self, cmd):
csk = cmd[1]
for c in cmd[2:]:
csk ^= c
return format(csk, 'X').encode('ascii')
def _make_cmd(self, cmd_code, payload = b''):
if len(cmd_code) != 3:
# print('incorrect command code:', cmd_code)
return None
cmd = bytes([0x02])
cmd += bytes([0x80 + self.address])
cmd += cmd_code
cmd += bytes([self.true if payload else self.false])
cmd += payload
cmd += bytes([0x03])
cmd += self._checksum(cmd)
return cmd
def _block(self):
i = 0
while self.communicating:
time.sleep(0.1)
i += 1
if i > 30: # wait for 3 seconds at most
# print("pump 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 == 0x1a86:
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
if not self.ser.is_open:
try:
self.ser.open()
except (serial.SerialException, TypeError):
pass
finally:
time.sleep(self.ser.timeout)
if self.ser.is_open:
print(port.device + ' opened for the vacuum pump')
break
def set_bool(self, parameter, value):
if not self._block():
# print("pump is very busy")
return None
msg = self._make_cmd(parameter, bytes([self.true if value else self.false]))
if self.ser.is_open:
try:
self.communicating = True
self.ser.write(msg)
self.ser.flush()
time.sleep(1 if self.ser.timeout is None else self.ser.timeout)
resp = self.ser.read(6)
self.ser.flush()
self.communicating = False
# print('response:', resp)
# check for validity
if len(resp) != 6 or self._checksum(resp[:-2]) != resp[-2:]:
# print('incorrect response', resp, 'to', msg)
self.ser.reset_input_buffer()
self.ser.reset_output_buffer()
return None
elif resp[2] == 6:
# print('request acknowledged')
return True
else:
# print('the pump returned code', hex(resp[2]), 'as a response to', msg)
return False
except:
try:
self.ser.close()
except (serial.SerialException, TypeError):
print("can't close", self.ser.port)
pass
self.open_serial()
else:
self.open_serial()
return False
def get_bool(self, parameter):
if not self._block():
print("pump is very busy")
return None
msg = self._make_cmd(parameter)
if self.ser.is_open:
try:
self.communicating = True
self.ser.write(msg)
self.ser.flush()
time.sleep(1 if self.ser.timeout is None else self.ser.timeout)
resp = self.ser.read(10)
self.ser.flush()
self.communicating = False
# check for validity: _checksum and value
# print('response:', resp)
if len(resp) == 6 and self._checksum(resp[:-2]) == resp[-2:]:
# print('command', msg, 'failed with code', hex(resp[2]))
return None
if len(resp) != 10 or resp[:6] != msg[:6] or self._checksum(resp[:-2]) != resp[-2:]:
# print('incorrect response', resp, 'to', msg)
self.ser.reset_input_buffer()
self.ser.reset_output_buffer()
return None
if resp[6] in [self.true, self.false]:
return resp[6] == self.true
else:
# print('incorrect response', resp, 'to', msg)
self.ser.reset_input_buffer()
self.ser.reset_output_buffer()
return None
except (serial.SerialException, TypeError):
try:
self.ser.close()
except:
print("can't close", self.ser.port)
pass
self.open_serial()
else:
self.open_serial()
return None
def get_int6(self, parameter):
if not self._block():
print("pump is very busy")
return None
msg = self._make_cmd(parameter)
if self.ser.is_open:
try:
self.communicating = True
self.ser.write(msg)
self.ser.flush()
time.sleep(1 if self.ser.timeout is None else self.ser.timeout)
resp = self.ser.read(15)
self.ser.flush()
self.communicating = False
# check for validity: checksum and value
# print('response:', resp)
if len(resp) == 6 and self._checksum(resp[:-2]) == resp[-2:]:
# print('command', msg, 'failed with code', hex(resp[2]))
return None
if len(resp) != 15 or resp[:6] != msg[:6] or self._checksum(resp[:-2]) != resp[-2:]:
# print('incorrect response', resp, 'to', msg)
self.ser.reset_input_buffer()
self.ser.reset_output_buffer()
return None
else:
try:
return int(resp[6:12])
except (TypeError, ValueError):
# print('incorrect response', resp, 'to', msg)
self.ser.reset_input_buffer()
self.ser.reset_output_buffer()
return None
except:
try:
self.ser.close()
except (serial.SerialException, TypeError):
print("can't close", self.ser.port)
pass
self.open_serial()
else:
self.open_serial()
return None
def turn(self, turn_on):
return self.set_bool(self.parameter_pump_on, turn_on)
def is_on(self):
return self.get_bool(self.parameter_pump_on) and self.get_int6(self.parameter_status) in [2, 5]
def get_speed_hz(self):
return self.get_int6(self.parameter_speed_hz)
def run(self):
while True:
try:
self.pumping = self.is_on()
self.speed = self.get_speed_hz()
if self.speed:
self.speed *= 60.
time.sleep(1 if self.ser.timeout is None else self.ser.timeout)
except (KeyboardInterrupt, SystemExit):
print('caught ctrl+c')
try:
self.ser.close()
except (serial.SerialException, TypeError):
pass
self.communicating = False
self.join()
sys.exit(0)