From 7bfffdbbfe7b6ca42575c176083a2c9466692e6e Mon Sep 17 00:00:00 2001 From: Michael Buesch Date: Thu, 26 Apr 2012 19:06:16 +0200 Subject: Move hardware access routines to programmer implementation Signed-off-by: Michael Buesch --- libtoprammer/command_queue.py | 69 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 libtoprammer/command_queue.py (limited to 'libtoprammer/command_queue.py') diff --git a/libtoprammer/command_queue.py b/libtoprammer/command_queue.py new file mode 100644 index 0000000..233b8ac --- /dev/null +++ b/libtoprammer/command_queue.py @@ -0,0 +1,69 @@ +""" +# TOP2049 Open Source programming suite +# +# Generic command queue. +# +# Copyright (c) 2012 Michael Buesch +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License along +# with this program; if not, write to the Free Software Foundation, Inc., +# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +""" + +from util import * +import time + + +class CommandQueue(object): + "Generic hardware-command queue. Needs to be subclassed." + + def __init__(self, maxPacketBytes, synchronous=False): + self.maxPacketBytes = maxPacketBytes + self.synchronous = synchronous + self.commandQueue = [] + + def queueCommand(self, command): + """Queue a raw command for transmission.""" + assert(len(command) <= self.maxPacketBytes) + if self.synchronous: + self.send(command) + else: + self.commandQueue.append(command) + + def runCommandSync(self, command): + """Run a command synchronously. + This is slow. Don't use it without a very good reason.""" + self.flushCommands() + self.queueCommand(command) + self.flushCommands() + + def flushCommands(self, sleepSeconds=0): + """Flush the command queue.""" + command = b"" + for oneCommand in self.commandQueue: + assert(len(oneCommand) <= self.maxPacketBytes) + if len(command) + len(oneCommand) > self.maxPacketBytes: + self.send(command) + command = b"" + command += oneCommand + if command: + self.send(command) + self.commandQueue = [] + if sleepSeconds: + time.sleep(sleepSeconds) + + def send(self, data): + raise NotImplementedError # Reimplement in subclass. + + def receive(self, size): + raise NotImplementedError # Reimplement in subclass. -- cgit v1.2.3