haps_boot.py 文件源码

def run(self):
        if os.name != "posix":
            raise ValueError("Can only be run on Posix systems")
            return

        buffer = ""
        # While PySerial would be preferable and more machine-independant,
        # it does not support echo suppression
        with open(self.dbgser_tty_name, 'r+') as dbgser:
            # Config the debug serial port
            oldattrs = termios.tcgetattr(dbgser)
            newattrs = termios.tcgetattr(dbgser)
            newattrs[4] = termios.B115200  # ispeed
            newattrs[5] = termios.B115200  # ospeed
            newattrs[3] = newattrs[3] & ~termios.ICANON & ~termios.ECHO
            newattrs[6][termios.VMIN] = 0
            newattrs[6][termios.VTIME] = 10
            termios.tcsetattr(dbgser, termios.TCSANOW, newattrs)

            # As long as we weren't asked to stop, try to capture dbgserial
            # output and push each line up the result queue.
            try:
                while not self.stoprequest.isSet():
                    ch = dbgser.read(1)
                    if ch:
                        if ch == "\n":
                            # Push the line (sans newline) into our queue
                            # and clear the buffer for the next line.
                            self.result_q.put(buffer)
                            buffer = ""
                        elif ch != "\r":
                            buffer += ch
            except IOError:
                pass
            finally:
                # Restore previous settings
                termios.tcsetattr(dbgser, termios.TCSAFLUSH, oldattrs)
                # Flush any partial buffer
                if buffer:
                    self.result_q.put(buffer)