1. Cc2540 Hid
2. Cc2540 Driver Windows 7 32-bit

• 3Analysis
• 4Protocol
  • 4.2Reading BLE frames

Driver Tool, CC2540 driver for example. Windows 7 32 bit, CC2540 BLE is. While working on a client s project it became necessary to use a Bluetooth Low Energy sniffer to debug some weird behavior happening with the data transfers between the master and slave device. Drivers dell laptop vostro 3446 Windows xp download.

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Status

At this point (2017-05-09), the status is:

• it is pretty clear which commands the default sniffer firmware understands
• I wrote a little test program to dump raw BLE frames
• there is no plugin for WireShark yet

Introduction

This page is about the CC2540 bluetooth low-energy sniffer dongle and getting it to work with Linux.A nice end result could be that it becomes possible to sniff directly in WireShark with this dongle.

I have such a 'WeBee' dongle that can be found for about E15,- on websites like Aliexpress.

It's supposedly a CC2540 (or compatible) dongle, the USB id is 0451:16b3.

Interesting links:

Analysis

USB descriptor

When plugging this stick into a Linux machine, you can see it uses only one bulk endpoint.

Reading the identification from the stick with the 0xC0 command, results in the following 8-byte response

You can recognise the 2540 type number in there.

USB logs from Windows

This USB device does actually work with Windows:

I've captured a log of the communication over USB while the BLE is capturing bluetooth traffic from some iBeacon, using USB pcap.

In the logs, I cannot see any firmware blobs being downloaded to the stick.Probably the stick comes with a pre-loaded firmware of itself to do the BLE sniffing.

The USB control transfer request codes seem to match up with the code in https://github.com/christianpanton/ccsniffer/blob/master/ccsniffer.py

• 0xC0, GET_IDENT: returns some kind of identifier
• 0xC5, SET_POWER
• 0xC6, GET_POWER
• 0xC9, no idea, this appears in my USB logs but I can't find it in the python code
• 0xD0, START
• 0xD1, STOP
• 0xD2, SET CHAN

Protocol

In the windows sniffer software, it seems there are only two things communicated:

• towards the stick: which radio channel to sniff, and some other radio settings
• from the stick: raw sniffed BLE frames

Configuring the radio

This appears to be done using USB control transfers.

The following requests are sent:

Request type 0x40 is a vendor-specific device request from host-to-device.Request type 0xC0 is a vendor-specific device request from device-to-host.

Reading BLE frames

This appears to be done using USB bulk input transfers.

I can see a lot of similarities between the USB log and the BLE sniffer log.

Each frame starts with a byte indicating the type of frame, following by two bytes indicating the length of the rest of the frame (encoded as little endian).

data frames

The bulk USB data starts off with two bytes indicating the length of the rest of the data.

In the example image on the right:

• 00: 0 means this is a data frame
• 31 00: length of rest of frame encoded in little endian = 49 bytes decimal
• 39 04 29 54: part of the time stamp
• 2c d6 be ..: data frame contents

unknown frames (tick or 'alive'?)

The stick also returns 4-byte frames, alternating between

and

Interpretation:

• 01: 1 means this is a frame of type 1
• 01 00: length of the rest of the frame encoded in little endian = 1 byte
• 40 or C0: unknown data byte

Software

Preliminary code can be found athttps://github.com/bertrik/cc2540

Cc2540 Hid

It connects to the dongle and dumps raw USB packets to stdout.

This software requires libusb-1.0-dev

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Cc2540 Driver Windows 7 32-bit

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