239 lines
8.0 KiB
Python
Executable File
239 lines
8.0 KiB
Python
Executable File
#!/usr/bin/env python2
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# Script to interact with simulavr by simulating a serial port.
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#
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# Copyright (C) 2015 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 sys, optparse, time, os, pty, fcntl, termios, errno
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import pysimulavr
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SERIALBITS = 10 # 8N1 = 1 start, 8 data, 1 stop
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SIMULAVR_FREQ = 10**9
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# Class to read serial data from AVR serial transmit pin.
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class SerialRxPin(pysimulavr.PySimulationMember, pysimulavr.Pin):
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def __init__(self, baud, terminal):
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pysimulavr.Pin.__init__(self)
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pysimulavr.PySimulationMember.__init__(self)
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self.terminal = terminal
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self.sc = pysimulavr.SystemClock.Instance()
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self.delay = SIMULAVR_FREQ / baud
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self.current = 0
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self.pos = -1
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def SetInState(self, pin):
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pysimulavr.Pin.SetInState(self, pin)
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self.state = pin.outState
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if self.pos < 0 and pin.outState == pin.LOW:
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self.pos = 0
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self.sc.Add(self)
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def DoStep(self, trueHwStep):
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ishigh = self.state == self.HIGH
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self.current |= ishigh << self.pos
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self.pos += 1
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if self.pos == 1:
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return int(self.delay * 1.5)
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if self.pos >= SERIALBITS:
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data = chr((self.current >> 1) & 0xff)
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self.terminal.write(data)
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self.pos = -1
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self.current = 0
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return -1
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return self.delay
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# Class to send serial data to AVR serial receive pin.
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class SerialTxPin(pysimulavr.PySimulationMember, pysimulavr.Pin):
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def __init__(self, baud, terminal):
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pysimulavr.Pin.__init__(self)
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pysimulavr.PySimulationMember.__init__(self)
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self.terminal = terminal
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self.SetPin('H')
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self.sc = pysimulavr.SystemClock.Instance()
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self.delay = SIMULAVR_FREQ / baud
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self.current = 0
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self.pos = 0
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self.queue = ""
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self.sc.Add(self)
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def DoStep(self, trueHwStep):
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if not self.pos:
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if not self.queue:
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data = self.terminal.read()
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if not data:
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return self.delay * 100
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self.queue += data
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self.current = (ord(self.queue[0]) << 1) | 0x200
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self.queue = self.queue[1:]
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newstate = 'L'
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if self.current & (1 << self.pos):
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newstate = 'H'
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self.SetPin(newstate)
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self.pos += 1
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if self.pos >= SERIALBITS:
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self.pos = 0
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return self.delay
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# Support for creating VCD trace files
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class Tracing:
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def __init__(self, filename, signals):
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self.filename = filename
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self.signals = signals
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if not signals:
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self.dman = None
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return
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self.dman = pysimulavr.DumpManager.Instance()
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self.dman.SetSingleDeviceApp()
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def show_help(self):
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ostr = pysimulavr.ostringstream()
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self.dman.save(ostr)
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sys.stdout.write(ostr.str())
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sys.exit(1)
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def load_options(self):
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if self.dman is None:
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return
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if self.signals.strip() == '?':
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self.show_help()
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sigs = "\n".join(["+ " + s for s in self.signals.split(',')])
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self.dman.addDumpVCD(self.filename, sigs, "ns", False, False)
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def start(self):
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if self.dman is not None:
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self.dman.start()
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def finish(self):
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if self.dman is not None:
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self.dman.stopApplication()
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# Pace the simulation scaled to real time
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class Pacing(pysimulavr.PySimulationMember):
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def __init__(self, rate):
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pysimulavr.PySimulationMember.__init__(self)
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self.sc = pysimulavr.SystemClock.Instance()
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self.pacing_rate = 1. / (rate * SIMULAVR_FREQ)
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self.rel_time = self.next_rel_time = time.time()
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self.rel_clock = self.next_rel_clock = self.sc.GetCurrentTime()
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self.delay = SIMULAVR_FREQ / 10000
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self.sc.Add(self)
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def DoStep(self, trueHwStep):
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curtime = time.time()
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clock = self.sc.GetCurrentTime()
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clock_diff = clock - self.rel_clock
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time_diff = curtime - self.rel_time
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offset = clock_diff * self.pacing_rate - time_diff
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if offset > 0.000050:
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time.sleep(offset)
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if clock_diff > self.delay * 20:
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self.rel_clock = self.next_rel_clock
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self.rel_time = self.next_rel_time
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self.next_rel_clock = clock
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self.next_rel_time = curtime
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return self.delay
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# Forward data from a terminal device to the serial port pins
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class TerminalIO:
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def __init__(self):
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self.fd = -1
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def run(self, fd):
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self.fd = fd
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def write(self, data):
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os.write(self.fd, data)
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def read(self):
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try:
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return os.read(self.fd, 64)
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except os.error, e:
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if e.errno not in (errno.EAGAIN, errno.EWOULDBLOCK):
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pysimulavr.SystemClock.Instance().stop()
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return ""
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# Support for creating a pseudo-tty for emulating a serial port
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def create_pty(ptyname):
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mfd, sfd = pty.openpty()
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try:
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os.unlink(ptyname)
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except os.error:
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pass
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os.symlink(os.ttyname(sfd), ptyname)
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fcntl.fcntl(mfd, fcntl.F_SETFL
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, fcntl.fcntl(mfd, fcntl.F_GETFL) | os.O_NONBLOCK)
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old = termios.tcgetattr(mfd)
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old[3] = old[3] & ~termios.ECHO
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termios.tcsetattr(mfd, termios.TCSADRAIN, old)
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return mfd
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def main():
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usage = "%prog [options] <program.elf>"
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opts = optparse.OptionParser(usage)
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opts.add_option("-m", "--machine", type="string", dest="machine",
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default="atmega644", help="type of AVR machine to simulate")
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opts.add_option("-s", "--speed", type="int", dest="speed", default=8000000,
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help="machine speed")
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opts.add_option("-r", "--rate", type="float", dest="pacing_rate", default=0.,
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help="real-time pacing rate")
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opts.add_option("-b", "--baud", type="int", dest="baud", default=38400,
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help="baud rate of the emulated serial port")
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opts.add_option("-t", "--trace", type="string", dest="trace",
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help="signals to trace (? for help)")
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opts.add_option("-p", "--port", type="string", dest="port",
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default="/tmp/pseudoserial",
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help="pseudo-tty device to create for serial port")
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deffile = os.path.splitext(os.path.basename(sys.argv[0]))[0] + ".vcd"
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opts.add_option("-f", "--tracefile", type="string", dest="tracefile",
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default=deffile, help="filename to write signal trace to")
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options, args = opts.parse_args()
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if len(args) != 1:
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opts.error("Incorrect number of arguments")
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elffile = args[0]
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proc = options.machine
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ptyname = options.port
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speed = options.speed
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baud = options.baud
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# launch simulator
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sc = pysimulavr.SystemClock.Instance()
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trace = Tracing(options.tracefile, options.trace)
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dev = pysimulavr.AvrFactory.instance().makeDevice(proc)
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dev.Load(elffile)
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dev.SetClockFreq(SIMULAVR_FREQ / speed)
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sc.Add(dev)
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pysimulavr.cvar.sysConHandler.SetUseExit(False)
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trace.load_options()
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# Do optional real-time pacing
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if options.pacing_rate:
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pacing = Pacing(options.pacing_rate)
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# Setup terminal
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io = TerminalIO()
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# Setup rx pin
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rxpin = SerialRxPin(baud, io)
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net = pysimulavr.Net()
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net.Add(rxpin)
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net.Add(dev.GetPin("D1"))
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# Setup tx pin
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txpin = SerialTxPin(baud, io)
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net2 = pysimulavr.Net()
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net2.Add(dev.GetPin("D0"))
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net2.Add(txpin)
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# Display start banner
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msg = "Starting AVR simulation: machine=%s speed=%d\n" % (proc, speed)
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msg += "Serial: port=%s baud=%d\n" % (ptyname, baud)
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if options.trace:
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msg += "Trace file: %s\n" % (options.tracefile,)
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sys.stdout.write(msg)
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sys.stdout.flush()
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# Create terminal device
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fd = create_pty(ptyname)
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# Run loop
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try:
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io.run(fd)
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trace.start()
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sc.RunTimeRange(0x7fff0000ffff0000)
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trace.finish()
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finally:
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os.unlink(ptyname)
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if __name__ == '__main__':
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main()
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