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