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from abc import abstractmethod |
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from threading import Lock |
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from serial import Serial, SerialException, SerialTimeoutException |
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import usb |
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9
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class DriverException(Exception): |
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pass |
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class Driver: |
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def __init__(self): |
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self._lock = Lock() |
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def __enter__(self): |
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self.open() |
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def __exit__(self, exc_type, exc_val, exc_tb): |
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self.close() |
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def isOpen(self): |
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with self._lock: |
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return self._isOpen |
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def open(self): |
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with self._lock: |
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if not self._isOpen: |
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self._open() |
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def close(self): |
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with self._lock: |
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if self._isOpen: |
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self._close() |
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def read(self, count): |
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if count <= 0: |
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raise DriverException("Count must be > 0") |
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if not self.isOpen(): |
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raise DriverException("Device is closed") |
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with self._lock: |
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return self._read(count) |
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def write(self, msg): |
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if not self.isOpen(): |
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raise DriverException("Device is closed") |
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with self._lock: |
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self.write(msg) |
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@abstractmethod |
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def _isOpen(self): |
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pass |
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@abstractmethod |
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def _open(self): |
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pass |
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@abstractmethod |
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def _close(self): |
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pass |
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@abstractmethod |
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def _read(self, count): |
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pass |
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@abstractmethod |
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def _write(self, data): |
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pass |
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class SerialDriver(Driver): |
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def __init__(self, device, baudRate=115200): |
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super().__init__() |
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self._device = device |
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self._baudRate = baudRate |
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self._serial = None |
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def _isOpen(self): |
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return self._serial is None |
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def _open(self): |
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try: |
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self._dev = Serial(self._device, self._baudRate) |
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except SerialException as e: |
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raise DriverException(str(e)) |
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if not self._dev.isOpen(): |
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raise DriverException("Could not open specified device") |
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def _close(self): |
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self._serial.close() |
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self._serial = None |
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def _read(self, count): |
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return self._serial.read(count) |
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def _write(self, data): |
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try: |
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count = self._serial.write(data) |
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self._serial.flush() |
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except SerialTimeoutException as e: |
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raise DriverException(str(e)) |
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107
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108
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class USB2Driver(Driver): |
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def __init__(self, idVendor, idProduct): |
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Driver.__init__(self) |
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self._idVendor = idVendor |
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self._idProduct = idProduct |
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self._dev = None |
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self._epOut = None |
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self._epIn = None |
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self._interfaceNumber = None |
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def _isOpen(self): |
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return self._dev is not None |
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def _open(self): |
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try: |
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# find the first USB device that matches the filter |
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self._dev = usb.core.find(idVendor=self._idVendor, idProduct=self._idProduct) |
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if self._dev is None: |
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raise DriverException("Could not open specified device") |
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129
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# Detach kernel driver |
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if self._dev.is_kernel_driver_active(0): |
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try: |
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self._dev.detach_kernel_driver(0) |
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except usb.USBError as e: |
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raise DriverException("Could not detach kernel driver") |
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# set the active configuration. With no arguments, the first |
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# configuration will be the active one |
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self._dev.set_configuration() |
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# get an endpoint instance |
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cfg = self._dev.get_active_configuration() |
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self._interfaceNumber = cfg[(0, 0)].bInterfaceNumber |
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interface = usb.util.find_descriptor(cfg, bInterfaceNumber=self._interfaceNumber, |
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bAlternateSetting=usb.control.get_interface(self._dev, |
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self._interfaceNumber)) |
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usb.util.claim_interface(self._dev, self._interfaceNumber) |
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self._epOut = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction( |
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e.bEndpointAddress) == usb.ENDPOINT_OUT) |
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150
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151
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self._ep_in = usb.util.find_descriptor(interface, custom_match=lambda e: usb.util.endpoint_direction( |
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e.bEndpointAddress) == usb.ENDPOINT_IN) |
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if self._epOut is None or self._ep_in is None: |
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raise DriverException("Could not initialize USB endpoint") |
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except IOError as e: |
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raise DriverException(str(e)) |
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159
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def _close(self): |
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usb.util.release_interface(self._dev, self._interfaceNumber) |
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usb.util.dispose_resources(self._dev) |
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self._dev = self._epOut = self._epIn = None |
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164
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def _read(self, count): |
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return self._epIn.read(count) |
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167
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def _write(self, data): |
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return self._epOut.write(data) |
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half2me /
libant
