Streaming mode MWE

Embedded Security ChipWhisperer Software
1

Hi all,
I’ve been trying to set up streaming mode with the CW-Pro again recently and I cannot get it to work.
Here my minimal working example on AES without streaming:

import chipwhisperer as cw

scope = cw.scope()
target = cw.target(scope)
scope.default_setup()
# scope.adc.stream_mode = True
scope.clock.adc_src = "clkgen_x1"
scope.adc.samples = 100000
programmer = cw.programmers.STM32FProgrammer
cw.program_target(scope, programmer, path_to_hex)
target.simpleserial_write("k", bytearray([0x2b, 0x7e, 0x15, 0x16,
                                          0x28, 0xae, 0xd2, 0xa6,
                                          0xab, 0xf7, 0x15, 0x88,
                                          0x09, 0xcf, 0x4f, 0x3c]))
target.simpleserial_wait_ack()
scope.arm()
target.simpleserial_write("p", bytearray([0x6b, 0xc1, 0xbe, 0xe2,
                                          0x2e, 0x40, 0x9f, 0x96,
                                          0xe9, 0x3d, 0x7e, 0x11,
                                          0x73, 0x93, 0x17, 0x2a]))
response = target.simpleserial_read("r", 16)
scope.capture()
trace = scope.get_last_trace()

However, when I un-comment scope.adc.stream_mode = True, I get the following error message:

Traceback (most recent call last):
  File "test_stream.py", line 25, in <module>
    scope.capture()
  File "....", line 366, in capture
    return self.qtadc.capture(None)
  File "...", line 113, in capture
    timeout = self.sc.capture(offset, adc_freq, samples)
  File "....", line 2607, in capture
    scope_logger.warning('Timeout in OpenADC capture(), no trigger seen! Trigger forced, data is invalid. Status: %02x'%status)
UnboundLocalError: local variable 'status' referenced before assignment
WARNING:ChipWhisperer NAEUSB:Streaming: USB stream read timed out

Any idea what is missing to get it working ?

Thanks !

Brice

2

Hi Brice,

Can you post what scope.fw_version returns? We’ve recently fixed some bugs related to streaming mode, so it could just be that you need a firmware update.

Alex

3

Hi Alex,

Here’s the output of scope.fw_version:

{'major': 1, 'minor': 30, 'debug': 0}

Should I upgrade the firmware ?

Thanks,

Brice

4

Hi Brice,

Yeah, I’d recommend updating. Firmware version 1.61 should have a working stream mode.

Alex

5

Hi Alex,

I got the bin file from the Github repo under hardware/capture/chipwhisperer-cw1200/CW1200_SAM3UFW.bin and flashed it onto the CW1200. The firmware version is now 1.51. However, I get the following error:

OSError: Could not detect STM32F, check connections, BOOT MODE entry setup

Should I get a newer version from somewhere else ?

Brice

6

Hi Brice,

I’d recommend just following Updating Firmware — ChipWhisperer 5.6.1 documentation instead of using the .bin file directly.

If following the firmware update doesn’t give you 1.61, try replacing chipwhisperer/software/chipwhisperer/hardware/firmware/cw1200.py with Updating Firmware — ChipWhisperer 5.6.1 documentation, restarting the notebook (if you’re using one) and redoing the firmware update.

Alex

7

Hi Alex,

Updating the firmware to 1.61 and pulling the last ChipWhisperer version from Git fixed the issue.
Thanks for your help and for your work on this great tool !

Brice

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