#4 first implementation of locking for bus communication
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@ -1,6 +1,7 @@
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import minimalmodbus
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import logging
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from flask import jsonify
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from threading import Semaphore
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class PingvinCoil():
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"""Single coil data structure"""
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@ -109,8 +110,9 @@ class PingvinCoils():
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PingvinCoil()
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]
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def __init__(self, device, debug=False):
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def __init__(self, device, semaphore, debug=False):
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self.pingvin = device
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self.semaphore = semaphore
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if debug: self.coillogger.debug("Updating coil values from device")
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self.update(debug)
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@ -122,7 +124,9 @@ class PingvinCoils():
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self.pingvin.serial.timeout = 0.2
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self.pingvin.debug = debug
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if debug: self.coillogger.info(f"{len(self.coils)} coils registered")
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self.semaphore.acquire()
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curvalues = self.pingvin.read_bits(0,len(self.coils),1)
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self.semaphore.release()
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for i, coil in enumerate(self.coils):
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self.coils[i].value = bool(curvalues[i])
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if debug: self.coillogger.info("Coil values read succesfully")
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@ -131,7 +135,9 @@ class PingvinCoils():
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"""Update single coil value from device and return it"""
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self.pingvin.debug = debug
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if debug: self.coillogger.debug("Updating coil value from device to cache")
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self.semaphore.acquire()
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self.coils[address].value = bool(self.pingvin.read_bit(address, 1))
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self.semaphore.release()
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return self.value(address, debug)
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def value(self, address, debug=False):
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@ -142,7 +148,6 @@ class PingvinCoils():
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def print(self, debug=False):
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"""Human-readable print of all coil values"""
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coilvals = ""
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null = ""
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for i, coil in enumerate(self.coils):
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coilvals = coilvals + f"Coil {i : <{4}}{coil.value : <{2}} {coil.symbol : <{25}}{coil.description}\n"
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return coilvals
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@ -163,14 +168,18 @@ class PingvinCoils():
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return jsonify(self.serialize(include_reserved))
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def write(self, address):
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self.semaphore.acquire()
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self.pingvin.write_bit(address, int(not self.coils[address].value))
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if self.pingvin.read_bit(address, 1) != self.coils[address].value:
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self.coils[address].flip()
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self.semaphore.release()
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return True
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self.semaphore.release()
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return False
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class PingvinKL():
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"""Class for communicating with an Enervent Pinvin Kotilämpö ventilation/heating unit"""
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def __init__(self, serialdevice='/dev/ttyS0', modbusaddr=1, debug=False):
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self.semaphore = Semaphore()
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self.pingvin = minimalmodbus.Instrument(serialdevice, modbusaddr)
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self.coils = PingvinCoils(self.pingvin, debug)
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self.coils = PingvinCoils(self.pingvin, self.semaphore, debug)
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