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Import of the watch repository from Pebble
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160
tools/serial_port_wrapper.py
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160
tools/serial_port_wrapper.py
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# Copyright 2024 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import serial
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import threading
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import time
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PEBBLE_BAUD_RATE = 230400
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SERIAL_READ_TIMEOUT = 0.1
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SERIAL_WRAPPER_READ_TIMEOUT = 0.5
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class SerialPortWrapperException(Exception):
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pass
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class SerialPortWrapper(threading.Thread):
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def __init__(self, tty, logfile='serial_dump.txt', baud_rate=PEBBLE_BAUD_RATE):
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threading.Thread.__init__(self)
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self.tty = tty
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if tty.startswith('ftdi://'):
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import pyftdi.serialext
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self.s = serial.serial_for_url(tty, baud_rate, timeout=SERIAL_READ_TIMEOUT)
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self.read_size = 1
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self.debug_out = None
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# if a logfile is specified log serial output. If a file descriptor
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# is provided log to the descriptor but do not close the descriptor.
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if logfile is not None:
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if isinstance(logfile, basestring):
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self.debug_out = open(logfile, 'wb')
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self._close_debug = True
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elif isinstance(logfile, file):
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self.debug_out = logfile
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self._close_debug = False
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else:
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raise ValueError('logfile must be a filename or an open file '
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'descriptor.')
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# This signal is used to protect and signal changes in the below
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# self.data member variable
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self.signal = threading.Condition()
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self.data = ''
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self.die = False
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self.daemon = True
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self.start()
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def run(self):
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while not self.die:
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data = self.s.read(self.read_size)
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if len(data):
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#print 'received data <(%s)>' % data
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self.signal.acquire()
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try:
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self.data += data
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if self.debug_out is not None:
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self.debug_out.write(data)
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self.debug_out.flush()
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self.signal.notify_all()
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finally:
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self.signal.release()
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def write_fast(self, data):
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#print 'writing <(%s)>' % strip_unprintable_chars(data)
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rv = self.s.write(data)
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return rv
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def write_slow(self, data):
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for c in data:
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self.s.write(c)
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time.sleep(0.01)
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def write(self, data):
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self.write_slow(data)
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def readline(self, timeout=SERIAL_WRAPPER_READ_TIMEOUT):
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result = ''
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self.signal.acquire()
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try:
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# Try to find a newline character. If we don't have one, wait until we
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# receive more data before checking again. If we hit the timeout without
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# receiving anything just return what we have.
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idx = self.data.find('\n')
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while idx == -1:
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prev_data_len = len(self.data)
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self.signal.wait(timeout)
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if (prev_data_len != len(self.data)):
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idx = self.data.find('\n')
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else:
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idx = len(self.data) - 1
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if len(self.data) == 0:
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break
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idx += 1
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result = self.data[:idx].strip()
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self.data = self.data[idx:]
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#print 'returning <(%s)>, %u remaining' % (result, len(self.data))
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finally:
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self.signal.release()
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return result
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def read(self, timeout=SERIAL_WRAPPER_READ_TIMEOUT):
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self.signal.acquire()
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while True:
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prev_data_len = len(self.data)
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self.signal.wait(timeout)
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if (prev_data_len == len(self.data)):
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# No new data available after our timeout, assume we're done
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break
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result = self.data
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self.data = ''
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self.signal.release()
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return result
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def read_regex(self, regex, timeout=SERIAL_WRAPPER_READ_TIMEOUT):
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match = None
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while not match:
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match = regex.search(self.readline(timeout))
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return match
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def clear(self):
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self.signal.acquire()
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self.data = ''
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self.signal.release()
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def close(self):
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self.die = True
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self.join()
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self.s.close()
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if self.debug_out is not None and self._close_debug:
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self.debug_out.close()
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