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#!/usr/bin/env python
# Script to interact with simulavr by simulating a serial port.
#
# Copyright (C) 2015 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import sys, optparse, os, pty, select, fcntl, termios, traceback, errno
import pysimulavr
SERIALBITS = 10 # 8N1 = 1 start, 8 data, 1 stop
# Class to read serial data from AVR serial transmit pin.
class SerialRxPin(pysimulavr.PySimulationMember, pysimulavr.Pin):
def __init__(self, baud):
pysimulavr.Pin.__init__(self)
pysimulavr.PySimulationMember.__init__(self)
self.sc = pysimulavr.SystemClock.Instance()
self.delay = 10**9 / baud
self.current = 0
self.pos = -1
self.queue = ""
def SetInState(self, pin):
pysimulavr.Pin.SetInState(self, pin)
self.state = pin.outState
if self.pos < 0 and pin.outState == pin.LOW:
self.pos = 0
self.sc.Add(self)
def DoStep(self, trueHwStep):
ishigh = self.state == self.HIGH
self.current |= ishigh << self.pos
self.pos += 1
if self.pos == 1:
return int(self.delay * 1.5)
if self.pos >= SERIALBITS:
self.queue += chr((self.current >> 1) & 0xff)
self.pos = -1
self.current = 0
return -1
return self.delay
def popChars(self):
d = self.queue
self.queue = ""
return d
# Class to send serial data to AVR serial receive pin.
class SerialTxPin(pysimulavr.PySimulationMember, pysimulavr.Pin):
MAX_QUEUE = 64
def __init__(self, baud):
pysimulavr.Pin.__init__(self)
pysimulavr.PySimulationMember.__init__(self)
self.SetPin('H')
self.sc = pysimulavr.SystemClock.Instance()
self.delay = 10**9 / baud
self.current = 0
self.pos = 0
self.queue = ""
def DoStep(self, trueHwStep):
if not self.pos:
if not self.queue:
return -1
self.current = (ord(self.queue[0]) << 1) | 0x200
self.queue = self.queue[1:]
newstate = 'L'
if self.current & (1 << self.pos):
newstate = 'H'
self.SetPin(newstate)
self.pos += 1
if self.pos >= SERIALBITS:
self.pos = 0
return self.delay
def needChars(self):
if len(self.queue) > self.MAX_QUEUE / 2:
return 0
return self.MAX_QUEUE - len(self.queue)
def pushChars(self, c):
queueEmpty = not self.queue
self.queue += c
if queueEmpty:
self.sc.Add(self)
# Support for creating VCD trace files
class Tracing:
def __init__(self, filename, signals):
self.filename = filename
self.signals = signals
if not signals:
self.dman = None
return
self.dman = pysimulavr.DumpManager.Instance()
self.dman.SetSingleDeviceApp()
def show_help(self):
ostr = pysimulavr.ostringstream()
self.dman.save(ostr)
sys.stdout.write(ostr.str())
sys.exit(1)
def load_options(self):
if self.dman is None:
return
if self.signals.strip() == '?':
self.show_help()
sigs = "\n".join(["+ " + s for s in self.signals.split(',')])
self.dman.addDumpVCD(self.filename, sigs, "ns", False, False)
def start(self):
if self.dman is not None:
self.dman.start()
def finish(self):
if self.dman is not None:
self.dman.stopApplication()
# Support for creating a pseudo-tty for emulating a serial port
def create_pty(ptyname):
mfd, sfd = pty.openpty()
try:
os.unlink(ptyname)
except os.error:
pass
os.symlink(os.ttyname(sfd), ptyname)
fcntl.fcntl(mfd, fcntl.F_SETFL
, fcntl.fcntl(mfd, fcntl.F_GETFL) | os.O_NONBLOCK)
old = termios.tcgetattr(mfd)
old[3] = old[3] & ~termios.ECHO
termios.tcsetattr(mfd, termios.TCSADRAIN, old)
return mfd
def main():
usage = "%prog [options] <program.elf>"
opts = optparse.OptionParser(usage)
opts.add_option("-m", "--machine", type="string", dest="machine",
default="atmega644", help="type of AVR machine to simulate")
opts.add_option("-s", "--speed", type="int", dest="speed", default=8000000,
help="machine speed")
opts.add_option("-b", "--baud", type="int", dest="baud", default=38400,
help="baud rate of the emulated serial port")
opts.add_option("-t", "--trace", type="string", dest="trace",
help="signals to trace (? for help)")
opts.add_option("-p", "--port", type="string", dest="port",
default="/tmp/pseudoserial",
help="pseudo-tty device to create for serial port")
deffile = os.path.splitext(os.path.basename(sys.argv[0]))[0] + ".vcd"
opts.add_option("-f", "--tracefile", type="string", dest="tracefile",
default=deffile, help="filename to write signal trace to")
options, args = opts.parse_args()
if len(args) != 1:
opts.error("Incorrect number of arguments")
elffile = args[0]
proc = options.machine
ptyname = options.port
speed = options.speed
baud = options.baud
# launch simulator
sc = pysimulavr.SystemClock.Instance()
trace = Tracing(options.tracefile, options.trace)
dev = pysimulavr.AvrFactory.instance().makeDevice(proc)
dev.Load(elffile)
dev.SetClockFreq(10**9 / speed)
sc.Add(dev)
trace.load_options()
# Setup rx pin
rxpin = SerialRxPin(baud)
net = pysimulavr.Net()
net.Add(rxpin)
net.Add(dev.GetPin("D1"))
# Setup tx pin
txpin = SerialTxPin(baud)
net2 = pysimulavr.Net()
net2.Add(dev.GetPin("D0"))
net2.Add(txpin)
# Display start banner
msg = "Starting AVR simulation: machine=%s speed=%d\n" % (proc, speed)
msg += "Serial: port=%s baud=%d\n" % (ptyname, baud)
if options.trace:
msg += "Trace file: %s\n" % (options.tracefile,)
sys.stdout.write(msg)
sys.stdout.flush()
# Create terminal device
fd = create_pty(ptyname)
# Run loop
try:
trace.start()
while 1:
starttime = sc.GetCurrentTime()
r = sc.RunTimeRange(speed/1000)
endtime = sc.GetCurrentTime()
if starttime == endtime:
break
d = rxpin.popChars()
if d:
os.write(fd, d)
txsize = txpin.needChars()
if txsize:
res = select.select([fd], [], [], 0)
if res[0]:
try:
d = os.read(fd, txsize)
except os.error, e:
if e.errno in (errno.EAGAIN, errno.EWOULDBLOCK):
continue
break
txpin.pushChars(d)
trace.finish()
finally:
os.unlink(ptyname)
if __name__ == '__main__':
main()
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