configuration.py 文件源码

def _read_device_state():
    """INTERNAL. Read from the I2C bus to get the current state of the pulse. Caller should handle exceptions"""

    try:
        PTLogger.debug("Connecting to bus...")
        i2c_bus = SMBus(_bus_id)

        current_state = i2c_bus.read_byte(_device_addr) & 0x0F

        return int(current_state)

    except:
        PTLogger.warning("Error: There was a problem reading from the device")
        # Best to re-raise as we can't recover from this
        raise