CW303 XMEGA Target

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CW-Lite XMEGA Target
Cwlite-xmega.jpg
Target Device Atmel XMEGA128
Target Architecture 8-bit Harvard
Hardware Crypto Possible
Supported Apps Simple Serial Enc/Auth
Programmer CW Integrated (PDI)
Status Released

The ChipWhisperer-Lite board has a break-away target board section. This target can be used attached to the CW-Lite or separated and connected via ribbon cable. The breakaway target board has a slightly different feature set than the CW308T-XMEGA target board.

LEDs

The two LEDs on the XMEGA board are active-low, which is done to reduce the impact on power consumption in the VCC power signature. The connections are as follows:

Item Connection Note
LED9 PORTA.5 Active low
LED10 PORTA.6 Active low

Connectors

The following shows several of the connectors available on the CW301.

20-Pin Connector
J2 is a 20-pin connector, which uses the standard NewAE 20-pin connector pinout. See the ChipWhisperer-Lite documentation for details.
SMA Glitch
The SMA glitch connector allows VCC glitches be inserted into the VCC pin. This is done by shorting the resistive shunt R66. By default it connects to the SMA measure connector, but can be disconnected with the solder jumpers.
SMA Measure
The SMA measure connector allows power measurements to be taken across resistive shunt R66. By default it connects to the SMA glitch connector, but can be disconnected with the solder jumpers.
JP13
JP13 provides a pinout with several extra pins from the XMEGA device.

Solder Jumpers

SJ2
Selects the source of the input to the VCC filter - either the 20-pin 3.3V VCC (default), or the optional voltage regulator which derives the power from a USB-Micro connector.
SJ3
Connects the output of the VCC filter to the XMEGA VCC network. Soldered by default.
SJ4
Connects the SMA Measure header to the resistive shunt. Soldered by default.
SJ5
Connects the SMA Glitch header to the resistive shunt. Soldered by default.
SJ7
Connects the VCC of the XMEGA board to VREF on 20-pin header. Soldered by default.

Building firmware

The XMEGA uses AVR architecture and needs an AVR compiler. The target firmware can be found under the chipwhisperer/hardware/victims/firmware/ directory in their project (e.g. simpleserial-aes, basic-passwdcheck) folder.

To build the code, follow these steps:

  1. cd to the project directory with the firmware source (.c) and makefile, and run make:

    cd c:\chipwhisperer\hardware\victims\firmware\<project dir>
    make PLATFORM=CW303 CRYPTO_TARGET=AVRCRYPTOLIB

    where the <> part is changed to the project name.

    If this is successful, you'll see an output like the following:

    image

    If instead you get an error something like make: *** No rule to make target `simpleserial.elf', needed by `elf'. Stop., this means a required file was missing.

  2. The compiled firmware file you will use to program the target will have the format <sourcefile name>-CW303.hex, where the <> part will change based on the project.

Setting up Communication

Sets up the ability for communication with the target using the ChipWhisperer scope.

Using GUI Scripts

Within the python console run the following scripts in order:

  1. connect_cwlite_simpleserial.py
  2. setup_cwlite_xmega.py

Python scripting

Execute these lines of code within a python console or script:

import chipwhisperer as cw

scope = cw.scope()
target = cw.target(scope)

scope.gain.gain = 45
scope.adc.samples = 25000
scope.adc.offset = 0
scope.adc.basic_mode = "rising_edge"
scope.clock.clkgen_freq = 7370000
scope.clock.adc_src = "clkgen_x4"
scope.trigger.triggers = "tio4"
scope.io.tio1 = "serial_rx"
scope.io.tio2 = "serial_tx"
scope.io.hs2 = "clkgen"

Programming the XMEGA

To program the device you need to have completed the Communication, and the Compiling sections. The firmware source files can be found in their directories under the chipwhisperer/hardware/victims/firmware/ directory.

Using GUI Tools

  1. From the Tools menu item select CW-Lite XMEGA Programmer

    Tools menu XMEGA programmer.png

  2. The Find button is used to choose the firmware file (.hex) to flash onto the device

    The Check Signature button resets the device and asks for its signature, this is printed to the screen

    The Erase/Program/Verify FLASH button erases, programs the device and then verifies the programmed firmware.

    XMEGA programmer.png

Python Scripting

Anything surrounded by < and > is user and project specific and needs to be changed.

from chipwhisperer.capture.api.programmers import XMEGAProgrammer

programmer = XMEGAProgrammer()
programmer.scope = scope
programmer._logging = None
programmer.find()
programmer.erase()
programmer.program("<path to xmega firmware .hex file>", memtype="flash", verify=True)
programmer.close()

Schematic

image