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https://github.com/uhi22/pyPLC.git
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84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
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# For serial (including USB-to-serial) interfaces:
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# https://pyserial.readthedocs.io/en/latest/pyserial.html
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# Install pyserial library:
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# python -m pip install pyserial
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# List ports:
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# python -m serial.tools.list_ports
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import serial # the pyserial
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from serial.tools.list_ports import comports
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from time import sleep
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class hardwareInterface():
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def findSerialPort(self):
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ports = []
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self.addToTrace('Available serial ports:')
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for n, (port, desc, hwid) in enumerate(sorted(comports()), 1):
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self.addToTrace('{:2}: {:20} {!r}'.format(n, port, desc))
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ports.append(port)
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if (len(ports)<1):
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self.addToTrace("ERROR: No serial ports found. No hardware interaction possible.")
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self.ser = None
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self.isInterfaceOk = False
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else:
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self.addToTrace("ok, we take the first port, " + ports[0])
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try:
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self.ser = serial.Serial(ports[0], 19200, timeout=0)
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self.isInterfaceOk = True
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except:
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self.addToTrace("ERROR: Could not open serial port.")
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self.ser = None
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self.isInterfaceOk = False
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def addToTrace(self, s):
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self.callbackAddToTrace("[HARDWAREINTERFACE] " + s)
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def setStateB(self):
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self.addToTrace("Setting CP line into state B.")
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self.outvalue = 0
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def setStateC(self):
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self.addToTrace("Setting CP line into state C.")
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self.outvalue = 1
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def __init__(self, callbackAddToTrace=None):
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self.callbackAddToTrace = callbackAddToTrace
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self.loopcounter = 0
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self.outvalue = 0
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self.findSerialPort()
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def close(self):
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if (self.isInterfaceOk):
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self.ser.close()
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def mainfunction(self):
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self.loopcounter+=1
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if (self.isInterfaceOk):
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if (self.loopcounter>15):
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self.loopcounter=0
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# self.ser.write(b'hello world\n')
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self.ser.write(bytes("out"+str(self.outvalue)+"\n", "utf-8"))
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s = self.ser.read(100)
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if (len(s)>0):
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self.addToTrace(str(len(s)) + " bytes received: " + str(s, 'utf-8').strip())
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def myPrintfunction(s):
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print("myprint " + s)
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if __name__ == "__main__":
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print("Testing hardwareInterface...")
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hw = hardwareInterface(myPrintfunction)
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for i in range(0, 300):
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hw.mainfunction()
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if (i==100):
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hw.setStateC()
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if (i==200):
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hw.setStateB()
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if (i==250):
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hw.setStateC()
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if (i==280):
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hw.setStateB()
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sleep(0.03)
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hw.close()
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print("finished.") |