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serial
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urlhandler
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protocol_spy.py
#! python # # This module implements a special URL handler that wraps an other port, # print the traffic for debugging purposes. With this, it is possible # to debug the serial port traffic on every application that uses # serial_for_url. # # This file is part of pySerial. https://github.com/pyserial/pyserial # (C) 2015 Chris Liechti <cliechti@gmx.net> # # SPDX-License-Identifier: BSD-3-Clause # # URL format: spy://port[?option[=value][&option[=value]]] # options: # - dev=X a file or device to write to # - color use escape code to colorize output # - raw forward raw bytes instead of hexdump # # example: # redirect output to an other terminal window on Posix (Linux): # python -m serial.tools.miniterm spy:///dev/ttyUSB0?dev=/dev/pts/14\&color from __future__ import absolute_import import sys import time import serial from serial.serialutil import to_bytes try: import urlparse except ImportError: import urllib.parse as urlparse def sixteen(data): """\ yield tuples of hex and ASCII display in multiples of 16. Includes a space after 8 bytes and (None, None) after 16 bytes and at the end. """ n = 0 for b in serial.iterbytes(data): yield ('{:02X} '.format(ord(b)), b.decode('ascii') if b' ' <= b < b'\x7f' else '.') n += 1 if n == 8: yield (' ', '') elif n >= 16: yield (None, None) n = 0 if n > 0: while n < 16: n += 1 if n == 8: yield (' ', '') yield (' ', ' ') yield (None, None) def hexdump(data): """yield lines with hexdump of data""" values = [] ascii = [] offset = 0 for h, a in sixteen(data): if h is None: yield (offset, ' '.join([''.join(values), ''.join(ascii)])) del values[:] del ascii[:] offset += 0x10 else: values.append(h) ascii.append(a) class FormatRaw(object): """Forward only RX and TX data to output.""" def __init__(self, output, color): self.output = output self.color = color self.rx_color = '\x1b[32m' self.tx_color = '\x1b[31m' def rx(self, data): """show received data""" if self.color: self.output.write(self.rx_color) self.output.write(data) self.output.flush() def tx(self, data): """show transmitted data""" if self.color: self.output.write(self.tx_color) self.output.write(data) self.output.flush() def control(self, name, value): """(do not) show control calls""" pass class FormatHexdump(object): """\ Create a hex dump of RX ad TX data, show when control lines are read or written. output example:: 000000.000 Q-RX flushInput 000002.469 RTS inactive 000002.773 RTS active 000003.001 TX 48 45 4C 4C 4F HELLO 000003.102 RX 48 45 4C 4C 4F HELLO """ def __init__(self, output, color): self.start_time = time.time() self.output = output self.color = color self.rx_color = '\x1b[32m' self.tx_color = '\x1b[31m' self.control_color = '\x1b[37m' def write_line(self, timestamp, label, value, value2=''): self.output.write('{:010.3f} {:4} {}{}\n'.format(timestamp, label, value, value2)) self.output.flush() def rx(self, data): """show received data as hex dump""" if self.color: self.output.write(self.rx_color) if data: for offset, row in hexdump(data): self.write_line(time.time() - self.start_time, 'RX', '{:04X} '.format(offset), row) else: self.write_line(time.time() - self.start_time, 'RX', '<empty>') def tx(self, data): """show transmitted data as hex dump""" if self.color: self.output.write(self.tx_color) for offset, row in hexdump(data): self.write_line(time.time() - self.start_time, 'TX', '{:04X} '.format(offset), row) def control(self, name, value): """show control calls""" if self.color: self.output.write(self.control_color) self.write_line(time.time() - self.start_time, name, value) class Serial(serial.Serial): """\ Inherit the native Serial port implementation and wrap all the methods and attributes. """ # pylint: disable=no-member def __init__(self, *args, **kwargs): super(Serial, self).__init__(*args, **kwargs) self.formatter = None self.show_all = False @serial.Serial.port.setter def port(self, value): if value is not None: serial.Serial.port.__set__(self, self.from_url(value)) def from_url(self, url): """extract host and port from an URL string""" parts = urlparse.urlsplit(url) if parts.scheme != 'spy': raise serial.SerialException( 'expected a string in the form ' '"spy://port[?option[=value][&option[=value]]]": ' 'not starting with spy:// ({!r})'.format(parts.scheme)) # process options now, directly altering self formatter = FormatHexdump color = False output = sys.stderr try: for option, values in urlparse.parse_qs(parts.query, True).items(): if option == 'file': output = open(values[0], 'w') elif option == 'color': color = True elif option == 'raw': formatter = FormatRaw elif option == 'all': self.show_all = True else: raise ValueError('unknown option: {!r}'.format(option)) except ValueError as e: raise serial.SerialException( 'expected a string in the form ' '"spy://port[?option[=value][&option[=value]]]": {}'.format(e)) self.formatter = formatter(output, color) return ''.join([parts.netloc, parts.path]) def write(self, tx): tx = to_bytes(tx) self.formatter.tx(tx) return super(Serial, self).write(tx) def read(self, size=1): rx = super(Serial, self).read(size) if rx or self.show_all: self.formatter.rx(rx) return rx if hasattr(serial.Serial, 'cancel_read'): def cancel_read(self): self.formatter.control('Q-RX', 'cancel_read') super(Serial, self).cancel_read() if hasattr(serial.Serial, 'cancel_write'): def cancel_write(self): self.formatter.control('Q-TX', 'cancel_write') super(Serial, self).cancel_write() @property def in_waiting(self): n = super(Serial, self).in_waiting if self.show_all: self.formatter.control('Q-RX', 'in_waiting -> {}'.format(n)) return n def flush(self): self.formatter.control('Q-TX', 'flush') super(Serial, self).flush() def reset_input_buffer(self): self.formatter.control('Q-RX', 'reset_input_buffer') super(Serial, self).reset_input_buffer() def reset_output_buffer(self): self.formatter.control('Q-TX', 'reset_output_buffer') super(Serial, self).reset_output_buffer() def send_break(self, duration=0.25): self.formatter.control('BRK', 'send_break {}s'.format(duration)) super(Serial, self).send_break(duration) @serial.Serial.break_condition.setter def break_condition(self, level): self.formatter.control('BRK', 'active' if level else 'inactive') serial.Serial.break_condition.__set__(self, level) @serial.Serial.rts.setter def rts(self, level): self.formatter.control('RTS', 'active' if level else 'inactive') serial.Serial.rts.__set__(self, level) @serial.Serial.dtr.setter def dtr(self, level): self.formatter.control('DTR', 'active' if level else 'inactive') serial.Serial.dtr.__set__(self, level) @serial.Serial.cts.getter def cts(self): level = super(Serial, self).cts self.formatter.control('CTS', 'active' if level else 'inactive') return level @serial.Serial.dsr.getter def dsr(self): level = super(Serial, self).dsr self.formatter.control('DSR', 'active' if level else 'inactive') return level @serial.Serial.ri.getter def ri(self): level = super(Serial, self).ri self.formatter.control('RI', 'active' if level else 'inactive') return level @serial.Serial.cd.getter def cd(self): level = super(Serial, self).cd self.formatter.control('CD', 'active' if level else 'inactive') return level # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - if __name__ == '__main__': ser = Serial(None) ser.port = 'spy:///dev/ttyS0' print(ser)
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