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#!/usr/bin/env python
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Matthias P. Braendli, Maximilien Cuony
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
import serial
import threading
import collections
SERIALPORT = "/dev/ttyACM0"
BAUDRATE = 9600
LINES_TO_KEEP = 200
class SerialRX(threading.Thread):
def __init__(self):
threading.Thread.__init__(self)
print("Open Serial on {} at {}".format(SERIALPORT, BAUDRATE))
self.ser = serial.Serial(SERIALPORT, baudrate=BAUDRATE)
self.event_stop = threading.Event()
self.data_lock = threading.Lock()
self.clients = []
self.line_accumulator = []
print("Serial port ready")
def run(self):
print("Serial port starting reception")
while not self.event_stop.is_set():
databyte = self.ser.read()
self.line_accumulator.append(databyte)
if databyte == "\n":
self.data_lock.acquire()
try:
for queue in self.clients:
queue.append("".join(self.line_accumulator))
if len(queue) > LINES_TO_KEEP:
queue.popleft()
except:
raise
finally:
self.data_lock.release()
self.line_accumulator = []
def stop(self):
self.event_stop.set()
self.join()
def register_client(self):
self.data_lock.acquire()
try:
new_queue = collections.deque()
self.clients.append(new_queue)
except:
raise
finally:
self.data_lock.release()
return new_queue
def unregister_client(self, queue):
self.data_lock.acquire()
try:
self.clients.remove(queue)
except:
raise
finally:
self.data_lock.release()
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