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https://github.com/uhi22/pyPLC.git
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230 lines
8.8 KiB
Python
230 lines
8.8 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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from configmodule import getConfigValue, getConfigValueBool
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if (getConfigValue("digital_output_device")=="beaglebone"):
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# In case we run on beaglebone, we want to use GPIO ports.
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import Adafruit_BBIO.GPIO as GPIO
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class hardwareInterface():
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def needsSerial(self):
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# Find out, whether we need a serial port. This depends on several configuration items.
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if (getConfigValueBool("display_via_serial")):
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return True # a display is expected to be connected to serial port.
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if (getConfigValue("digital_output_device")=="dieter"):
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return True # a "dieter" output device is expected to be connected on serial port.
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if (getConfigValue("analog_input_device")=="dieter"):
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return True # a "dieter" input device is expected to be connected on serial port.
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return False # non of the functionalities need a serial port.
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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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if (port=="/dev/ttyAMA0"):
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self.addToTrace("ignoring /dev/ttyAMA0, because this is not an USB serial port")
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else:
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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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if (self.needsSerial()):
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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.isSerialInterfaceOk = False
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else:
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self.addToTrace("We found no serial port, but also do not need it. No problem.")
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self.ser = None
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self.isSerialInterfaceOk = 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.isSerialInterfaceOk = 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.isSerialInterfaceOk = 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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if (getConfigValue("digital_output_device")=="beaglebone"):
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GPIO.output("P8_18", GPIO.LOW)
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self.outvalue &= ~1
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def setStateC(self):
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self.addToTrace("Setting CP line into state C.")
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if (getConfigValue("digital_output_device")=="beaglebone"):
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GPIO.output("P8_18", GPIO.HIGH)
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self.outvalue |= 1
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def setPowerRelayOn(self):
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self.addToTrace("Switching PowerRelay ON.")
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if (getConfigValue("digital_output_device")=="beaglebone"):
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GPIO.output("P8_16", GPIO.HIGH)
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self.outvalue |= 2
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def setPowerRelayOff(self):
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self.addToTrace("Switching PowerRelay OFF.")
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if (getConfigValue("digital_output_device")=="beaglebone"):
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GPIO.output("P8_16", GPIO.LOW)
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self.outvalue &= ~2
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def setRelay2On(self):
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self.addToTrace("Switching Relay2 ON.")
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self.outvalue |= 4
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def setRelay2Off(self):
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self.addToTrace("Switching Relay2 OFF.")
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self.outvalue &= ~4
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def getPowerRelayConfirmation(self):
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return 1 # todo: self.contactor_confirmed
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def getInletVoltage(self):
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# uncomment this line, to take the simulated inlet voltage instead of the really measured
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# self.inletVoltage = self.simulatedInletVoltage
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return self.inletVoltage
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def getAccuVoltage(self):
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#todo: get real measured voltage from the accu
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self.accuVoltage = 230
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return self.accuVoltage
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def getAccuMaxCurrent(self):
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#todo: get max charging current from the BMS
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self.accuMaxCurrent = 10
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return self.accuMaxCurrent
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def getAccuMaxVoltage(self):
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#todo: get max charging voltage from the BMS
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self.accuMaxVoltage = 230
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return self.accuMaxVoltage
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def getIsAccuFull(self):
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#todo: get "full" indication from the BMS
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self.IsAccuFull = (self.simulatedSoc >= 98)
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return self.IsAccuFull
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def getSoc(self):
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#todo: get SOC from the BMS
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self.callbackShowStatus(format(self.simulatedSoc,".1f"), "soc")
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return self.simulatedSoc
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def initPorts(self):
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if (getConfigValue("digital_output_device") == "beaglebone"):
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# Port configuration according to https://github.com/jsphuebner/pyPLC/commit/475f7fe9f3a67da3d4bd9e6e16dfb668d0ddb1d6
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GPIO.setup("P8_16", GPIO.OUT) #output for port relays
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GPIO.setup("P8_18", GPIO.OUT) #output for CP
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def __init__(self, callbackAddToTrace=None, callbackShowStatus=None):
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self.callbackAddToTrace = callbackAddToTrace
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self.callbackShowStatus = callbackShowStatus
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self.loopcounter = 0
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self.outvalue = 0
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self.simulatedSoc = 20.0 # percent
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self.inletVoltage = 0.0 # volts
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self.rxbuffer = ""
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self.findSerialPort()
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self.initPorts()
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def resetSimulation(self):
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self.simulatedInletVoltage = 0.0 # volts
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self.simulatedSoc = 20.0 # percent
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def simulatePreCharge(self):
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if (self.simulatedInletVoltage<230):
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self.simulatedInletVoltage = self.simulatedInletVoltage + 1.0 # simulate increasing voltage during PreCharge
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def close(self):
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if (self.isSerialInterfaceOk):
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self.ser.close()
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def evaluateReceivedData(self, s):
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self.rxbuffer += s
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x=self.rxbuffer.find("A0=")
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if (x>=0):
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s = self.rxbuffer[x+3:x+7]
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if (len(s)==4):
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try:
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self.inletVoltage = int(s) / 1024.0 * 1.08 * (6250) / (4.7+4.7)
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if (getConfigValue("analog_input_device")=="dieter"):
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self.callbackShowStatus(format(self.inletVoltage,".1f"), "uInlet")
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except:
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# keep last known value, if nothing new valid was received.
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pass
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#self.addToTrace("RX data ok " + s)
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self.rxbuffer = self.rxbuffer[x+3:] # consume the receive buffer entry
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def showOnDisplay(self, s1, s2, s3):
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# show the given string s on the display which is connected to the serial port
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if (getConfigValueBool("display_via_serial") and self.isSerialInterfaceOk):
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s = "lc" + s1 + "\n" + "lc" + s2 + "\n" + "lc" + s3 + "\n"
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self.ser.write(bytes(s, "utf-8"))
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def mainfunction(self):
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if (getConfigValueBool("soc_simulation")):
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if (self.simulatedSoc<100):
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if ((self.outvalue & 2)!=0):
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# while the relay is closed, simulate increasing SOC
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self.simulatedSoc = self.simulatedSoc + 0.01
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self.loopcounter+=1
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if (self.isSerialInterfaceOk):
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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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s = "000" + str(self.outvalue)
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self.ser.write(bytes("do"+s+"\n", "utf-8")) # set outputs of dieter, see https://github.com/uhi22/dieter
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s = self.ser.read(100)
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if (len(s)>0):
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try:
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s = str(s, 'utf-8').strip()
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except:
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s = "" # for the case we received corrupted data (not convertable as utf-8)
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self.addToTrace(str(len(s)) + " bytes received: " + s)
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self.evaluateReceivedData(s)
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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, 350):
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hw.mainfunction()
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if (i==20):
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hw.showOnDisplay("Hello", "A DEMO", "321.0V")
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if (i==50):
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hw.setStateC()
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if (i==100):
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hw.setStateB()
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if (i==150):
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hw.setStateC()
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hw.setPowerRelayOn()
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hw.showOnDisplay("", "..middle..", "")
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if (i==200):
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hw.setStateB()
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hw.setPowerRelayOff()
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if (i==250):
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hw.setRelay2On()
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if (i==300):
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hw.setRelay2Off()
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if (i==320):
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hw.showOnDisplay("This", "...is...", "DONE :-)")
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sleep(0.03)
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hw.close()
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print("finished.")
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