Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

scripts/avrsim.py

@@ -0,0 +1,212 @@
+#!/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()