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287 lines
12 KiB
Python
287 lines
12 KiB
Python
# Serial port management for firmware communication
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#
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# Copyright (C) 2016 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 time, logging, threading
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import serial
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import msgproto, chelper
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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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# MCU time/clock tracking
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self.last_ack_time = self.last_ack_rtt_time = 0.
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self.last_ack_clock = self.last_ack_rtt_clock = 0
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self.est_clock = 0.
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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.status_timer = self.reactor.register_timer(
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self._status_event, self.reactor.NOW)
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self.status_cmd = None
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handlers = {
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'#unknown': self.handle_unknown, '#state': self.handle_state,
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'#output': self.handle_output, 'status': self.handle_status,
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'shutdown': self.handle_output, 'is_shutdown': self.handle_output
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}
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self.handlers = dict(((k, None), v) for k, v in handlers.items())
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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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with self.lock:
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hdl = (params['#name'], params.get('oid'))
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hdl = self.handlers.get(hdl, self.handle_default)
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try:
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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 connect(self):
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logging.info("Starting serial connect")
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self.ser = serial.Serial(self.serialport, self.baud, timeout=0)
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stk500v2_leave(self.ser)
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baud_adjust = float(self.BITS_PER_BYTE) / self.baud
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self.serialqueue = self.ffi_lib.serialqueue_alloc(
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self.ser.fileno(), baud_adjust, 0)
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SerialBootStrap(self)
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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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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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baud_adjust = 0.
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est_clock = 1000000000000.
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if pace:
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baud_adjust = float(self.BITS_PER_BYTE) / self.baud
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est_clock = self.msgparser.config['CLOCK_FREQ']
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self.serialqueue = self.ffi_lib.serialqueue_alloc(
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self.ser.fileno(), baud_adjust, 1)
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self.est_clock = est_clock
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self.last_ack_time = time.time()
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self.last_ack_clock = 0
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self.ffi_lib.serialqueue_set_clock_est(
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self.serialqueue, self.est_clock, self.last_ack_time
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, self.last_ack_clock)
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def disconnect(self):
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self.send_flush()
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time.sleep(0.010)
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if self.ffi_lib 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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def stats(self, eventtime):
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if self.serialqueue is None:
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return ""
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sqstats = self.ffi_lib.serialqueue_get_stats(
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self.serialqueue, self.stats_buf, len(self.stats_buf))
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sqstats = self.ffi_main.string(self.stats_buf)
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tstats = " est_clock=%.3f last_ack_time=%.3f last_ack_clock=%d" % (
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self.est_clock, self.last_ack_time, self.last_ack_clock)
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return sqstats + tstats
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def _status_event(self, eventtime):
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if self.status_cmd is None:
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return eventtime + 0.1
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self.send(self.status_cmd)
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return eventtime + 1.0
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# Serial response callbacks
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def register_callback(self, callback, name, oid=None):
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with self.lock:
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self.handlers[name, oid] = callback
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def unregister_callback(self, name, oid=None):
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with self.lock:
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del self.handlers[name, oid]
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# Clock tracking
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def get_clock(self, eventtime):
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with self.lock:
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return int(self.last_ack_clock
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+ (eventtime - self.last_ack_time) * self.est_clock)
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def translate_clock(self, raw_clock):
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with self.lock:
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last_ack_clock = self.last_ack_clock
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clock_diff = (last_ack_clock - raw_clock) & 0xffffffff
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if clock_diff & 0x80000000:
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return last_ack_clock + 0x100000000 - clock_diff
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return last_ack_clock - clock_diff
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def get_last_clock(self):
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with self.lock:
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return self.last_ack_clock
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# Command sending
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def send(self, cmd, minclock=0, reqclock=0, cq=None):
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if cq is None:
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cq = self.default_cmd_queue
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self.ffi_lib.serialqueue_send(
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self.serialqueue, cq, cmd, len(cmd), minclock, reqclock)
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def encode_and_send(self, data, minclock, reqclock, cq):
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self.ffi_lib.serialqueue_encode_and_send(
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self.serialqueue, cq, data, len(data), minclock, reqclock)
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def send_with_response(self, cmd, callback, name):
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SerialRetryCommand(self, cmd, callback, name)
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def send_flush(self):
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self.ffi_lib.serialqueue_flush_ready(self.serialqueue)
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def alloc_command_queue(self):
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return self.ffi_lib.serialqueue_alloc_commandqueue()
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# Dumping debug lists
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def dump_debug(self):
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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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logging.info("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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logging.info("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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logging.info("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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logging.info("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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# Default message handlers
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def handle_status(self, params):
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with self.lock:
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# Update last_ack_time / last_ack_clock
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ack_clock = (self.last_ack_clock & ~0xffffffff) | params['clock']
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if ack_clock < self.last_ack_clock:
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ack_clock += 0x100000000
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sent_time = params['#sent_time']
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self.last_ack_time = receive_time = params['#receive_time']
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self.last_ack_clock = ack_clock
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# Update est_clock (if applicable)
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if receive_time > self.last_ack_rtt_time + 1. and sent_time:
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if self.last_ack_rtt_time:
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timedelta = receive_time - self.last_ack_rtt_time
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clockdelta = ack_clock - self.last_ack_rtt_clock
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estclock = clockdelta / timedelta
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if estclock > self.est_clock and self.est_clock:
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self.est_clock = (self.est_clock * 63. + estclock) / 64.
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else:
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self.est_clock = estclock
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self.last_ack_rtt_time = sent_time
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self.last_ack_rtt_clock = ack_clock
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self.ffi_lib.serialqueue_set_clock_est(
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self.serialqueue, self.est_clock, receive_time, ack_clock)
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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_state(self, params):
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state = params['#state']
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if state == 'connected':
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logging.info("Loaded %d commands (%s)" % (
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len(self.msgparser.messages_by_id), self.msgparser.version))
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else:
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logging.info("State: %s" % (state,))
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def handle_default(self, params):
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logging.warn("got %s" % (params,))
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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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RETRY_TIME = 0.500
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def __init__(self, serial, cmd, callback, name):
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self.serial = serial
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self.cmd = cmd
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self.callback = callback
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self.name = name
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self.serial.register_callback(self.handle_callback, self.name)
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self.send_timer = self.serial.reactor.register_timer(
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self.send_event, self.serial.reactor.NOW)
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def send_event(self, eventtime):
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if self.callback is None:
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self.serial.reactor.unregister_timer(self.send_timer)
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return self.serial.reactor.NEVER
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self.serial.send(self.cmd)
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return eventtime + self.RETRY_TIME
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def handle_callback(self, params):
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done = self.callback(params)
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if done:
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self.serial.unregister_callback(self.name)
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self.callback = None
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# Code to start communication and download message type dictionary
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class SerialBootStrap:
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RETRY_TIME = 0.500
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def __init__(self, serial):
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self.serial = serial
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self.identify_data = ""
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self.identify_cmd = self.serial.msgparser.lookup_command(
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"identify offset=%u count=%c")
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self.is_done = False
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self.serial.register_callback(self.handle_identify, 'identify_response')
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self.serial.register_callback(self.handle_unknown, '#unknown')
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self.send_timer = self.serial.reactor.register_timer(
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self.send_event, self.serial.reactor.NOW)
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def finalize(self):
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self.is_done = True
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self.serial.msgparser.process_identify(self.identify_data)
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logging.info("MCU version: %s" % (self.serial.msgparser.version,))
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self.serial.unregister_callback('identify_response')
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self.serial.register_callback(self.serial.handle_unknown, '#unknown')
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get_status = self.serial.msgparser.lookup_command('get_status')
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self.serial.status_cmd = get_status.encode()
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with self.serial.lock:
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hdl = self.serial.handlers['#state', None]
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statemsg = {'#name': '#state', '#state': 'connected'}
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hdl(statemsg)
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def handle_identify(self, params):
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if self.is_done or params['offset'] != len(self.identify_data):
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return
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msgdata = params['data']
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if not msgdata:
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self.finalize()
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return
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self.identify_data += msgdata
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imsg = self.identify_cmd.encode(len(self.identify_data), 40)
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self.serial.send(imsg)
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def send_event(self, eventtime):
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if self.is_done:
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self.serial.reactor.unregister_timer(self.send_timer)
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return self.serial.reactor.NEVER
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imsg = self.identify_cmd.encode(len(self.identify_data), 40)
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self.serial.send(imsg)
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return eventtime + self.RETRY_TIME
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def handle_unknown(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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# Attempt to place an AVR stk500v2 style programmer into normal mode
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def stk500v2_leave(ser):
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logging.debug("Starting stk500v2 leave programmer sequence")
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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 = 1200
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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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time.sleep(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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time.sleep(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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