257 lines
11 KiB
Python
257 lines
11 KiB
Python
# Serial port management for firmware communication
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#
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# Copyright (C) 2016-2019 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import logging, threading
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import serial
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import msgproto, chelper, util
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class error(Exception):
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pass
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class SerialReader:
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BITS_PER_BYTE = 10.
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def __init__(self, reactor, serialport, baud):
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self.reactor = reactor
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self.serialport = serialport
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self.baud = baud
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# Serial port
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self.ser = None
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self.msgparser = msgproto.MessageParser()
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# C interface
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self.ffi_main, self.ffi_lib = chelper.get_ffi()
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self.serialqueue = None
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self.default_cmd_queue = self.alloc_command_queue()
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self.stats_buf = self.ffi_main.new('char[4096]')
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# Threading
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self.lock = threading.Lock()
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self.background_thread = None
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# Message handlers
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self.handlers = {}
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self.register_response(self._handle_unknown_init, '#unknown')
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self.register_response(self.handle_output, '#output')
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def _bg_thread(self):
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response = self.ffi_main.new('struct pull_queue_message *')
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while 1:
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self.ffi_lib.serialqueue_pull(self.serialqueue, response)
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count = response.len
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if count <= 0:
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break
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params = self.msgparser.parse(response.msg[0:count])
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params['#sent_time'] = response.sent_time
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params['#receive_time'] = response.receive_time
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hdl = (params['#name'], params.get('oid'))
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try:
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with self.lock:
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hdl = self.handlers.get(hdl, self.handle_default)
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hdl(params)
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except:
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logging.exception("Exception in serial callback")
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def _get_identify_data(self, timeout):
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# Query the "data dictionary" from the micro-controller
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identify_data = ""
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while 1:
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msg = "identify offset=%d count=%d" % (len(identify_data), 40)
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params = self.send_with_response(msg, 'identify_response')
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if params['offset'] == len(identify_data):
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msgdata = params['data']
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if not msgdata:
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# Done
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return identify_data
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identify_data += msgdata
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if self.reactor.monotonic() > timeout:
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raise error("Timeout during identify")
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def connect(self):
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# Initial connection
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logging.info("Starting serial connect")
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start_time = self.reactor.monotonic()
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while 1:
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connect_time = self.reactor.monotonic()
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if connect_time > start_time + 150.:
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raise error("Unable to connect")
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try:
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if self.baud:
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self.ser = serial.Serial(
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self.serialport, self.baud, timeout=0, exclusive=True)
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else:
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self.ser = open(self.serialport, 'rb+')
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except (OSError, IOError, serial.SerialException) as e:
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logging.warn("Unable to open port: %s", e)
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self.reactor.pause(connect_time + 5.)
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continue
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if self.baud:
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stk500v2_leave(self.ser, self.reactor)
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self.serialqueue = self.ffi_lib.serialqueue_alloc(
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self.ser.fileno(), 0)
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self.background_thread = threading.Thread(target=self._bg_thread)
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self.background_thread.start()
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# Obtain and load the data dictionary from the firmware
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try:
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identify_data = self._get_identify_data(connect_time + 5.)
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except error as e:
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logging.exception("Timeout on serial connect")
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self.disconnect()
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continue
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break
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msgparser = msgproto.MessageParser()
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msgparser.process_identify(identify_data)
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self.msgparser = msgparser
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self.register_response(self.handle_unknown, '#unknown')
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# Setup baud adjust
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mcu_baud = msgparser.get_constant_float('SERIAL_BAUD', None)
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if mcu_baud is not None:
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baud_adjust = self.BITS_PER_BYTE / mcu_baud
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self.ffi_lib.serialqueue_set_baud_adjust(
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self.serialqueue, baud_adjust)
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receive_window = msgparser.get_constant_int('RECEIVE_WINDOW', None)
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if receive_window is not None:
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self.ffi_lib.serialqueue_set_receive_window(
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self.serialqueue, receive_window)
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def connect_file(self, debugoutput, dictionary, pace=False):
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self.ser = debugoutput
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self.msgparser.process_identify(dictionary, decompress=False)
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self.serialqueue = self.ffi_lib.serialqueue_alloc(self.ser.fileno(), 1)
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def set_clock_est(self, freq, last_time, last_clock):
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self.ffi_lib.serialqueue_set_clock_est(
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self.serialqueue, freq, last_time, last_clock)
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def disconnect(self):
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if self.serialqueue is not None:
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self.ffi_lib.serialqueue_exit(self.serialqueue)
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if self.background_thread is not None:
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self.background_thread.join()
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self.ffi_lib.serialqueue_free(self.serialqueue)
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self.background_thread = self.serialqueue = None
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if self.ser is not None:
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self.ser.close()
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self.ser = None
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def stats(self, eventtime):
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if self.serialqueue is None:
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return ""
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self.ffi_lib.serialqueue_get_stats(
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self.serialqueue, self.stats_buf, len(self.stats_buf))
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return self.ffi_main.string(self.stats_buf)
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def get_msgparser(self):
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return self.msgparser
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def get_default_command_queue(self):
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return self.default_cmd_queue
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# Serial response callbacks
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def register_response(self, callback, name, oid=None):
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with self.lock:
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if callback is None:
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del self.handlers[name, oid]
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else:
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self.handlers[name, oid] = callback
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# Command sending
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def raw_send(self, cmd, minclock, reqclock, cmd_queue):
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self.ffi_lib.serialqueue_send(
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self.serialqueue, cmd_queue, cmd, len(cmd), minclock, reqclock)
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def send(self, msg, minclock=0, reqclock=0):
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cmd = self.msgparser.create_command(msg)
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self.raw_send(cmd, minclock, reqclock, self.default_cmd_queue)
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def send_with_response(self, msg, response):
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cmd = self.msgparser.create_command(msg)
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src = SerialRetryCommand(self, response)
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return src.get_response([cmd], self.default_cmd_queue)
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def alloc_command_queue(self):
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return self.ffi_main.gc(self.ffi_lib.serialqueue_alloc_commandqueue(),
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self.ffi_lib.serialqueue_free_commandqueue)
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# Dumping debug lists
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def dump_debug(self):
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out = []
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out.append("Dumping serial stats: %s" % (
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self.stats(self.reactor.monotonic()),))
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sdata = self.ffi_main.new('struct pull_queue_message[1024]')
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rdata = self.ffi_main.new('struct pull_queue_message[1024]')
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scount = self.ffi_lib.serialqueue_extract_old(
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self.serialqueue, 1, sdata, len(sdata))
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rcount = self.ffi_lib.serialqueue_extract_old(
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self.serialqueue, 0, rdata, len(rdata))
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out.append("Dumping send queue %d messages" % (scount,))
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for i in range(scount):
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msg = sdata[i]
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cmds = self.msgparser.dump(msg.msg[0:msg.len])
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out.append("Sent %d %f %f %d: %s" % (
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i, msg.receive_time, msg.sent_time, msg.len, ', '.join(cmds)))
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out.append("Dumping receive queue %d messages" % (rcount,))
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for i in range(rcount):
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msg = rdata[i]
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cmds = self.msgparser.dump(msg.msg[0:msg.len])
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out.append("Receive: %d %f %f %d: %s" % (
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i, msg.receive_time, msg.sent_time, msg.len, ', '.join(cmds)))
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return '\n'.join(out)
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# Default message handlers
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def _handle_unknown_init(self, params):
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logging.debug("Unknown message %d (len %d) while identifying",
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params['#msgid'], len(params['#msg']))
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def handle_unknown(self, params):
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logging.warn("Unknown message type %d: %s",
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params['#msgid'], repr(params['#msg']))
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def handle_output(self, params):
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logging.info("%s: %s", params['#name'], params['#msg'])
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def handle_default(self, params):
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logging.warn("got %s", params)
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def __del__(self):
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self.disconnect()
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# Class to retry sending of a query command until a given response is received
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class SerialRetryCommand:
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TIMEOUT_TIME = 5.0
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RETRY_TIME = 0.500
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def __init__(self, serial, name, oid=None):
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self.serial = serial
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self.name = name
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self.oid = oid
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self.completion = serial.reactor.completion()
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self.min_query_time = serial.reactor.monotonic()
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self.serial.register_response(self.handle_callback, name, oid)
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def handle_callback(self, params):
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if params['#sent_time'] >= self.min_query_time:
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self.min_query_time = self.serial.reactor.NEVER
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self.serial.reactor.async_complete(self.completion, params)
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def get_response(self, cmds, cmd_queue, minclock=0, minsystime=0.):
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first_query_time = query_time = max(self.min_query_time, minsystime)
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while 1:
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for cmd in cmds:
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self.serial.raw_send(cmd, minclock, minclock, cmd_queue)
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params = self.completion.wait(query_time + self.RETRY_TIME)
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if params is not None:
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self.serial.register_response(None, self.name, self.oid)
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return params
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query_time = self.serial.reactor.monotonic()
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if query_time > first_query_time + self.TIMEOUT_TIME:
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self.serial.register_response(None, self.name, self.oid)
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raise error("Timeout on wait for '%s' response" % (self.name,))
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# Attempt to place an AVR stk500v2 style programmer into normal mode
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def stk500v2_leave(ser, reactor):
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logging.debug("Starting stk500v2 leave programmer sequence")
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util.clear_hupcl(ser.fileno())
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origbaud = ser.baudrate
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# Request a dummy speed first as this seems to help reset the port
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ser.baudrate = 2400
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ser.read(1)
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# Send stk500v2 leave programmer sequence
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ser.baudrate = 115200
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reactor.pause(reactor.monotonic() + 0.100)
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ser.read(4096)
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ser.write('\x1b\x01\x00\x01\x0e\x11\x04')
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reactor.pause(reactor.monotonic() + 0.050)
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res = ser.read(4096)
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logging.debug("Got %s from stk500v2", repr(res))
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ser.baudrate = origbaud
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# Attempt an arduino style reset on a serial port
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def arduino_reset(serialport, reactor):
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# First try opening the port at a different baud
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ser = serial.Serial(serialport, 2400, timeout=0, exclusive=True)
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ser.read(1)
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reactor.pause(reactor.monotonic() + 0.100)
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# Then toggle DTR
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ser.dtr = True
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reactor.pause(reactor.monotonic() + 0.100)
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ser.dtr = False
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reactor.pause(reactor.monotonic() + 0.100)
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ser.close()
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