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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.core
import usb.util
except (ImportError) as e:
print("Python USB (PyUSB) support module not found.\n"
"Please install python3-usb.")
sys.exit(1)
class FoundUSBDev(object):
def __init__(self, usbdev):
self.usbdev = usbdev
class HardwareAccessUSB(CommandQueue):
"Lowlevel USB hardware access"
TIMEOUT_MSEC = 2000
@classmethod
def scan(cls, checkCallback):
"Scan for devices. Returns a list of FoundUSBDev()."
devices = list(usb.core.find(find_all = True,
custom_match = checkCallback))
devices = [ FoundUSBDev(dev) for dev in devices ]
return devices
def __init__(self, usbdev, maxPacketBytes, noQueue,
doRawDump=False):
CommandQueue.__init__(self,
maxPacketBytes = maxPacketBytes,
synchronous = noQueue)
self.doRawDump = doRawDump
self.usbdev = usbdev
self.__initUSB()
def __initUSB(self):
try:
# Find the endpoints
self.bulkOut = None
self.bulkIn = None
selectedConfig = None
selectedInterface = None
for config in self.usbdev.configurations():
for interface in config.interfaces():
for ep in interface.endpoints():
if self.bulkIn is None and \
usb.util.endpoint_type(ep.bmAttributes) == usb.util.ENDPOINT_TYPE_BULK and \
usb.util.endpoint_direction(ep.bEndpointAddress) == usb.util.ENDPOINT_IN:
self.bulkIn = ep
selectedConfig = config
selectedInterface = interface
if self.bulkOut is None and \
usb.util.endpoint_type(ep.bmAttributes) == usb.util.ENDPOINT_TYPE_BULK and \
usb.util.endpoint_direction(ep.bEndpointAddress) == usb.util.ENDPOINT_OUT:
self.bulkOut = ep
selectedConfig = config
selectedInterface = interface
if selectedInterface is not None:
break
if selectedConfig is not None:
break
if self.bulkIn is None or self.bulkOut is None or \
selectedConfig is None or selectedInterface is None:
raise TOPException("Did not find all USB EPs")
bInterfaceNumber = selectedInterface.bInterfaceNumber
# If some kernel driver attached to our device, detach it.
if self.usbdev.is_kernel_driver_active(bInterfaceNumber):
try:
self.usbdev.detach_kernel_driver(bInterfaceNumber)
except usb.core.USBError as e:
raise TOPException("USB error: "
"Failed to detach kernel driver: " + str(e))
self.usbdev.set_configuration(selectedConfig)
self.bulkIn.clear_halt()
self.bulkOut.clear_halt()
except usb.core.USBError as e:
raise TOPException("USB error: " + str(e))
def shutdown(self):
"Shutdown the USB connection"
try:
usb.util.dispose_resources(self.usbdev)
except (usb.core.USBError) as 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)
nrWritten = self.usbdev.write(
self.bulkOut.bEndpointAddress,
data,
self.TIMEOUT_MSEC)
if nrWritten != len(data):
raise TOPException("USB bulk write error: "
"short write")
except (usb.core.USBError) as 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.bEndpointAddress
data = b"".join([ int2byte(b) for b in
self.usbdev.read(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.core.USBError) as e:
raise TOPException("USB bulk read error: " + str(e))
return data
|
