def __init__(self, port_name=None, baud_rate=None,
data_bits=None, stop_bits=None):
# Read config
config = read_config()[port_name]
self.port_name = config['port_name']
self.baud_rate = config['baud_rate']
self.data_bits = config['data_bits']
self.stop_bits = config['stop_bits']
# Initial
self.weigher = QSerialPort() # It is the subclass of the QIODevice class;
self.weigher.setPortName(self.port_name) # passing name such as 'COM1'
self.weigher.setBaudRate(int(self.baud_rate))
self.weigher.setDataBits(QSerialPort.DataBits(int(self.data_bits)))
self.weigher.setStopBits(QSerialPort.StopBits(int(self.stop_bits)))
# Logging module
self.mylogging = MyLogging(logger_name='user')
self.mylogger = self.mylogging.logger
def weigherCheck(**kwargs):
check_status = False
port_name = kwargs['weigher']['port_name']
baud_rate = int(kwargs['weigher']['baud_rate'])
data_bits = int(kwargs['weigher']['data_bits'])
stop_bits = int(kwargs['weigher']['stop_bits'])
list_serialPort = QSerialPortInfo.availablePorts()
# print(list_serialPort) # the result is like <PyQt5.QtSerialPort.QSerialPortInfo object at 0x00000261AA5C1908>
if len(list_serialPort) < 1:
sys.exit('Weigher problem: weigher is missing')
else:
# try to use weigher to see whether there is some unknown issues.
serial = QSerialPort() # It is the subclass of the QIODevice class;
serial.setPortName(port_name) # passing name such as 'COM1'
serial.setBaudRate(int(baud_rate))
serial.setDataBits(QSerialPort.DataBits(int(data_bits)))
serial.setStopBits(QSerialPort.StopBits(int(stop_bits)))
if serial.open(QIODevice.ReadOnly):
# The QSerial.waitForReadyRead function blocks until new data is available for reading and the readyRead() signal has been emitted.
# This function returns true if the readyRead() signal is emitted and there is new data available for reading;
# Otherwise this function returns false (if an error occurred or the operation timed out).
if serial.waitForReadyRead(8000): # the unit is millisecond;
data1 = serial.readLine()
data2 = data1.data().decode(
'ascii'
) # converting the data type to str (the original string);
data3 = float(
data2[1:-4]
) # This will raise error if the data can not be converted successfully.
else:
sys.exit('Weigher problem: no data received from the weigher.')
serial.close()
else:
sys.exit(
'Weigher problem: the connection to the specific weigher fails. Please check the port name.'
)
check_status = True
return check_status
def weigherCheck_linux01(**kwargs):
"""
Compared with weigherCheck, the main difference is the way to try converting data;
:param kwargs:
:return:
"""
check_status = False
port_name = kwargs['weigher']['port_name']
baud_rate = int(kwargs['weigher']['baud_rate'])
data_bits = int(kwargs['weigher']['data_bits'])
stop_bits = int(kwargs['weigher']['stop_bits'])
list_serialPort = QSerialPortInfo.availablePorts()
# print(list_serialPort) # the result is like <PyQt5.QtSerialPort.QSerialPortInfo object at 0x00000261AA5C1908>
if len(list_serialPort) < 1:
sys.exit('Weigher problem: weigher is missing')
else:
# try to use weigher to see whether there is some unknown issues.
serial = QSerialPort() # It is the subclass of the QIODevice class;
serial.setPortName(port_name) # passing name such as 'COM1'
serial.setBaudRate(int(baud_rate))
serial.setDataBits(QSerialPort.DataBits(int(data_bits)))
serial.setStopBits(QSerialPort.StopBits(int(stop_bits)))
if serial.open(QIODevice.ReadOnly):
# The QSerial.waitForReadyRead function blocks until new data is available for reading and the readyRead() signal has been emitted.
# This function returns true if the readyRead() signal is emitted and there is new data available for reading;
# Otherwise this function returns false (if an error occurred or the operation timed out).
if serial.waitForReadyRead(8000): # the unit is millisecond;
discard = serial.readAll()
status_data_convert = True
convert_times = 0
can_readline_times = 0
while status_data_convert:
if serial.waitForReadyRead(500):
if serial.canReadLine():
data1 = serial.readLine()
data2 = data1.data().decode(
'ascii'
) # converting the data type to str (the original string);
try:
data3 = float(
data2[1:-4]
) # This will raise error if the data can not be converted successfully.
status_data_convert = False
except BaseException:
convert_times = convert_times + 1
print(
'Trying to convert the data fails with total %s times.'
% convert_times)
if convert_times > 29:
sys.exit(
'Weigher problem: the string data given by weigher can not be converted to the float data successfully.'
)
else:
can_readline_times = can_readline_times + 1
print('canReadLine fails with total %s times.' %
can_readline_times)
if can_readline_times > 29:
sys.exit(
'Weigher problem: there is no readLine signal too many times.'
)
else:
convert_times = convert_times + 1
print('waitForReadyRead fails with total %s times.' %
convert_times)
if convert_times > 29:
sys.exit(
'Weigher problem: the string data given by weigher can not be converted to the float data successfully.'
)
else:
sys.exit('Weigher problem: no data received from the weigher.')
serial.close()
else:
sys.exit(
'Weigher problem: the connection to the specific weigher fails. Please check the port name.'
)
check_status = True
return check_status
