#!/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 LAST_LINE_TO_KEEP = 1000 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 = [] self.last_lines = [] 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() self.last_lines.append("".join(self.line_accumulator)) if len(self.last_lines) > LAST_LINE_TO_KEEP: self.last_lines.pop(0) except: raise finally: self.data_lock.release() self.line_accumulator = [] def stop(self): self.event_stop.set() self.join() def get_last_lines(self): return self.last_lines 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()