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265 lines
7.9 KiB
265 lines
7.9 KiB
import time
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import serial
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import usb.core
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import threading
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class BaseGexTransport:
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""" Base class for GEX transports """
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def __init__(self):
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self._listener = None
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def close(self):
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# Tell the thread to shut down
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raise Exception("Not implemented")
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def __exit__(self, exc_type, exc_val, exc_tb):
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""" End of a with block, close the thread """
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self.close()
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def __enter__(self):
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""" This is needed for with blocks to work """
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return self
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def write(self, buffer):
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""" Send a buffer of bytes """
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raise Exception("Not implemented")
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def listen(self, listener):
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""" Attach a listener for incoming bytes """
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self._listener = listener
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def poll(self, timeout, testfunc=None):
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"""
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Receive bytes until a timeout, testfunc returns True,
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or first data if no testfunc is given
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"""
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raise Exception("Not implemented")
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class TrxSerialSync (BaseGexTransport):
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"""
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Transport based on pySerial, no async support.
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Call poll() to receive spontaneous events or responses.
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This can be used only if EXPOSE_ACM is enabled, or when GEX is connected
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using a USB-serial adaptor
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"""
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def __init__(self, port='/dev/ttyACM0', baud=115200, timeout=0.3):
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""" port - device to open """
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super().__init__()
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self._serial = serial.Serial(port=port, baudrate=baud, timeout=timeout)
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def close(self):
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# Tell the thread to shut down
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self._serial.close()
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def write(self, buffer):
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""" Send a buffer of bytes """
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self._serial.write(buffer)
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def poll(self, timeout, testfunc=None):
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"""
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Receive bytes until a timeout, testfunc returns True,
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or first data if no testfunc is given
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"""
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first = True
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attempts = 10
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while attempts > 0:
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rv = bytearray()
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# Blocking read with a timeout
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if first:
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rv.extend(self._serial.read(1))
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first = False
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# Non-blocking read of the rest
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rv.extend(self._serial.read(self._serial.in_waiting))
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if 0 == len(rv):
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# nothing was read
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if testfunc is None or testfunc():
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# TF is in base state, we're done
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return
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else:
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# Wait for TF to finish the frame
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attempts -= 1
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first = True
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else:
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if self._listener:
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self._listener(rv)
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class TrxSerialThread (BaseGexTransport):
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"""
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Transport based on pySerial, running on a thread.
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This can be used only if EXPOSE_ACM is enabled, or when GEX is connected
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using a USB-serial adaptor
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"""
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def __init__(self, port='/dev/ttyACM0', baud=115200, timeout=0.2):
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""" port - device to open """
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super().__init__()
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self._serial = serial.Serial(port=port, baudrate=baud, timeout=timeout)
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self.dataSem = threading.Semaphore()
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self.dataSem.acquire()
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# ----------------------- RX THREAD ---------------------------
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# The reception is done using a thread.
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# It ends when _ending is set True
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self._ending = False
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def worker():
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while not self._ending:
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try:
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resp = self._serial.read(max(1, self._serial.in_waiting))
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if len(resp) and self._listener is not None:
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self._listener(bytearray(resp))
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self.dataSem.release() # notify we have data
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except usb.USBError:
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pass # timeout
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t = threading.Thread(target=worker)
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t.start()
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# Save a reference for calling join() later
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self._thread = t
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def close(self):
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# Tell the thread to shut down
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self._ending = True
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self._thread.join()
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self._serial.close()
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def write(self, buffer):
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""" Send a buffer of bytes """
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self._serial.write(buffer)
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def poll(self, timeout, testfunc=None):
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"""
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Receive bytes until a timeout, testfunc returns True,
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or first data if no testfunc is given
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"""
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start = time.time()
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while (time.time() - start) < timeout:
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self.dataSem.acquire(True, 0.1)
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if testfunc is None or testfunc():
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break
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pass
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class TrxRawUSB (BaseGexTransport):
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"""
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pyUSB-based transport with minimal overhead and async IO
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"""
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def __init__(self, sn=None):
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""" sn - GEX serial number """
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super().__init__()
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self.dataSem = threading.Semaphore()
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self.dataSem.acquire()
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GEX_ID = (0x1209, 0x4c60)
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# -------------------- FIND THE DEVICE ------------------------
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def dev_match(d):
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if (d.idVendor, d.idProduct) != GEX_ID:
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return False
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# Match only by ID if serial not given
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if sn is None:
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return True
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# Reading the S/N can fail with insufficient permissions (wrong udev rules)
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# Note that this error will happen later when configuring the device, too
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try:
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if d.serial_number == sn:
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return True
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except Exception as e:
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print(e)
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pass
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return False
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dev = usb.core.find(custom_match=dev_match)
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if dev is None:
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raise Exception("Found no matching and accessible device.")
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self._dev = dev
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# -------------------- PREPARE TO CONNECT ---------------------
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# If the ACM interface is visible (not 255), the system driver may be attached.
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# Here we tear that down and expose the raw endpoints
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def detach_kernel_driver(dev, iface):
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if dev.is_kernel_driver_active(1):
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try:
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dev.detach_kernel_driver(1)
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except usb.core.USBError as e:
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raise Exception("Could not detach kernel driver from iface %d: %s" % (iface, str(e)))
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# EP0 - control
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# EP1 - VFS in/out
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# EP2 - CDC data in/out
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# EP3 - CDC control
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detach_kernel_driver(dev, 2) # CDC data
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detach_kernel_driver(dev, 3) # CDC control
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# Set default configuration
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# (this will fail if we don't have the right permissions)
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dev.set_configuration()
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# We could now print the configuration
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#cfg = dev.get_active_configuration()
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# ----------------------- RX THREAD ---------------------------
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# The reception is done using a thread.
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# It ends when _ending is set True
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self._ending = False
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def worker():
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while not self._ending:
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try:
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resp = self._dev.read(0x82, 64, 100)
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if self._listener is not None:
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self._listener(bytearray(resp))
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self.dataSem.release() # notify we have data
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except usb.USBError:
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pass # timeout
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t = threading.Thread(target=worker)
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t.start()
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# Save a reference for calling join() later
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self._thread = t
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def close(self):
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# Tell the thread to shut down
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self._ending = True
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self._thread.join()
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usb.util.dispose_resources(self._dev)
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def write(self, buffer):
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""" Send a buffer of bytes """
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self._dev.write(0x02, buffer, 100)
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def poll(self, timeout, testfunc=None):
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# Using time.sleep() would block for too long. Instead we release the semaphore on each Rx chunk of data
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# and then check if it's what we wanted (let TF handle it and call the listener)
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start = time.time()
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while (time.time() - start) < timeout:
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self.dataSem.acquire(True, 0.1)
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if testfunc is None or testfunc():
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break
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pass
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