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"""
# TOP2049 Open Source programming suite
#
# Lowlevel USB hardware access.
#
# Copyright (c) 2012 Michael Buesch <m@bues.ch>
#
# 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 *
from command_queue import *
try:
import usb
except (ImportError), e:
print "Python USB support module not found. Please install python-usb."
sys.exit(1)
class FoundUSBDev(object):
def __init__(self, usbdev, busNr, devNr):
self.usbdev = usbdev
self.busNr = busNr
self.devNr = devNr
class HardwareAccessUSB(CommandQueue):
"Lowlevel USB hardware access"
TIMEOUT_MSEC = 2000
@classmethod
def scan(cls, checkCallback):
"Scan for devices. Returns a list of FoundUSBDev()."
devices = []
for bus in usb.busses():
for dev in bus.devices:
if not checkCallback(dev):
continue
try:
busNr = int(bus.dirname, 10)
devNr = int(dev.filename, 10)
except (ValueError), e:
continue
devices.append(FoundUSBDev(dev, busNr, devNr))
return devices
def __init__(self, usbdev, maxPacketBytes, noQueue,
doRawDump=False):
CommandQueue.__init__(self,
maxPacketBytes = maxPacketBytes,
synchronous = noQueue)
self.doRawDump = doRawDump
self.usbdev = usbdev
self.usbh = None
self.__initUSB()
def __initUSB(self):
try:
self.usbh = self.usbdev.open()
config = self.usbdev.configurations[0]
interface = config.interfaces[0][0]
# Find the endpoints
self.bulkOut = None
self.bulkIn = None
for ep in interface.endpoints:
if not self.bulkIn and \
ep.type == usb.ENDPOINT_TYPE_BULK and \
(ep.address & (usb.ENDPOINT_IN | usb.ENDPOINT_OUT)) == usb.ENDPOINT_IN:
self.bulkIn = ep
if not self.bulkOut and \
ep.type == usb.ENDPOINT_TYPE_BULK and \
(ep.address & (usb.ENDPOINT_IN | usb.ENDPOINT_OUT)) == usb.ENDPOINT_OUT:
self.bulkOut = ep
if not self.bulkIn or not self.bulkOut:
raise TOPException("Did not find all USB EPs")
self.usbh.setConfiguration(config)
self.usbh.claimInterface(interface)
self.usbh.setAltInterface(interface)
self.usbh.clearHalt(self.bulkOut.address)
self.usbh.clearHalt(self.bulkIn.address)
except (usb.USBError), e:
self.usbh = None
raise TOPException("USB error: " + str(e))
def shutdown(self):
"Shutdown the USB connection"
try:
if self.usbh:
self.usbh.releaseInterface()
self.usbh = None
except (usb.USBError), e:
raise TOPException("USB error: " + str(e))
def send(self, data):
try:
assert(len(data) <= self.maxPacketBytes)
if self.doRawDump:
print("Sending command:")
dumpMem(data)
self.usbh.bulkWrite(self.bulkOut.address, data,
self.TIMEOUT_MSEC)
except (usb.USBError), e:
raise TOPException("USB bulk write error: " + str(e))
def receive(self, size):
"""Receive 'size' bytes on the bulk-in ep."""
# If there are blocked commands in the queue, send them now.
self.flushCommands()
try:
ep = self.bulkIn.address
data = b"".join([ int2byte(b) for b in
self.usbh.bulkRead(ep, size,
self.TIMEOUT_MSEC) ])
if len(data) != size:
raise TOPException("USB bulk read error: Could not read the " +\
"requested number of bytes (req %d, got %d)" % (size, len(data)))
if self.doRawDump:
print("Received data:")
dumpMem(data)
except (usb.USBError), e:
raise TOPException("USB bulk read error: " + str(e))
return data
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