104 lines
3.3 KiB
Python
104 lines
3.3 KiB
Python
#!/usr/bin/env python3
|
|
#
|
|
# Copyright (c) 2019 Intel Corporation.
|
|
#
|
|
# SPDX-License-Identifier: Apache-2.0
|
|
"""
|
|
Script to capture tracing data with USB backend.
|
|
"""
|
|
|
|
import usb.core
|
|
import usb.util
|
|
import argparse
|
|
import sys
|
|
|
|
def parse_args():
|
|
global args
|
|
parser = argparse.ArgumentParser(
|
|
description=__doc__,
|
|
formatter_class=argparse.RawDescriptionHelpFormatter, allow_abbrev=False)
|
|
parser.add_argument("-v", "--vendor_id", required=True,
|
|
help="usb device vendor id")
|
|
parser.add_argument("-p", "--product_id", required=True,
|
|
help="usb device product id")
|
|
parser.add_argument("-o", "--output", default='channel0_0',
|
|
required=False, help="tracing data output file")
|
|
args = parser.parse_args()
|
|
|
|
def main():
|
|
parse_args()
|
|
if args.vendor_id.isdecimal():
|
|
vendor_id = int(args.vendor_id)
|
|
else:
|
|
vendor_id = int(args.vendor_id, 16)
|
|
|
|
if args.product_id.isdecimal():
|
|
product_id = int(args.product_id)
|
|
else:
|
|
product_id = int(args.product_id, 16)
|
|
|
|
output_file = args.output
|
|
|
|
try:
|
|
usb_device = usb.core.find(idVendor=vendor_id, idProduct=product_id)
|
|
except Exception as e:
|
|
sys.exit("{}".format(e))
|
|
|
|
if usb_device is None:
|
|
sys.exit("No device found, check vendor_id and product_id")
|
|
|
|
if usb_device.is_kernel_driver_active(0):
|
|
try:
|
|
usb_device.detach_kernel_driver(0)
|
|
except usb.core.USBError as e:
|
|
sys.exit("{}".format(e))
|
|
|
|
# set the active configuration. With no arguments, the first
|
|
# configuration will be the active one
|
|
try:
|
|
usb_device.set_configuration()
|
|
except usb.core.USBError as e:
|
|
sys.exit("{}".format(e))
|
|
|
|
configuration = usb_device[0]
|
|
interface = configuration[(0, 0)]
|
|
|
|
# match the only IN endpoint
|
|
read_endpoint = usb.util.find_descriptor(interface, custom_match = \
|
|
lambda e: \
|
|
usb.util.endpoint_direction( \
|
|
e.bEndpointAddress) == \
|
|
usb.util.ENDPOINT_IN)
|
|
|
|
# match the only OUT endpoint
|
|
write_endpoint = usb.util.find_descriptor(interface, custom_match = \
|
|
lambda e: \
|
|
usb.util.endpoint_direction( \
|
|
e.bEndpointAddress) == \
|
|
usb.util.ENDPOINT_OUT)
|
|
|
|
usb.util.claim_interface(usb_device, interface)
|
|
|
|
#enable device tracing
|
|
write_endpoint.write('enable')
|
|
|
|
#try to read to avoid garbage mixed to useful stream data
|
|
buff = usb.util.create_buffer(8192)
|
|
read_endpoint.read(buff, 10000)
|
|
|
|
with open(output_file, "wb") as file_desc:
|
|
while True:
|
|
buff = usb.util.create_buffer(8192)
|
|
length = read_endpoint.read(buff, 100000)
|
|
for index in range(length):
|
|
file_desc.write(chr(buff[index]).encode('latin1'))
|
|
|
|
usb.util.release_interface(usb_device, interface)
|
|
|
|
if __name__=="__main__":
|
|
try:
|
|
main()
|
|
except KeyboardInterrupt:
|
|
print('Data capture interrupted, data saved into {}'.format(args.output))
|
|
sys.exit(0)
|