EVNotiPi/watchdog.py at master · SiGmAX666/EVNotiPi · GitHub

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from smbus import SMBus
import logging

class Watchdog:
    def __init__(self, config):
        self.log = logging.getLogger("EVNotiPi/Watchdog")
        self.i2c_address = config['i2c_address']
        self.i2c_voltage_multiplier = 0.06
        self.i2c_bus_id = config['i2c_bus'] if 'i2c_bus' in config else 0
        self.i2c_bus = SMBus()

    def _BusOpen(self):
        self.i2c_bus.open(self.i2c_bus_id)

    def _BusClose(self):
        self.i2c_bus.close()

    def getShutdownFlag(self):
        self._BusOpen()
        self.i2c_bus.write_byte(self.i2c_address, 2)
        ret = self.i2c_bus.read_byte(self.i2c_address)
        self._BusClose()

        return ret

    def getVoltage(self):
        self._BusOpen()
        self.i2c_bus.write_byte(self.i2c_address, 1)
        ret = self.i2c_bus.read_byte(self.i2c_address)
        self._BusClose()

        return ret * self.i2c_voltage_multiplier

    def calibrateVoltage(self, realVoltage):
        self._BusOpen()
        self.i2c_bus.write_byte(self.i2c_address, 1)
        ret = self.i2c_bus.read_byte(self.i2c_address)
        self._BusClose()

        self.i2c_voltage_multiplier = realVoltage / ret
        self.log.info("Calibration: {} {} {}".format(realVoltage, ret, self.i2c_voltage_multiplier))

    def getThresholds(self):
        self._BusOpen()
        self.i2c_bus.write_byte(self.i2c_address, 0x11)
        start = self.i2c_bus.read_byte(self.i2c_address)
        self.i2c_bus.write_byte(self.i2c_address, 0x12)
        shut  = self.i2c_bus.read_byte(self.i2c_address)
        self.i2c_bus.write_byte(self.i2c_address, 0x13)
        emerg = self.i2c_bus.read_byte(self.i2c_address)
        self._BusClose()

        return {
                'startup':   start * self.i2c_voltage_multiplier,
                'shutdown':  shut * self.i2c_voltage_multiplier,
                'emergency': emerg * self.i2c_voltage_multiplier,
                }