CW312_A35 Custom bitstream

Embedded Security ChipWhisperer Hardware
1

Hello,

I am familiar with the ChipWhisperer-Lite + CW305_A7 duo to perform power analysis of custom designs. Basically, I program the FPGA with a simple script:

import chipwhisperer as cw
target = cw.target(None, cw.targets.CW305, bsfile=<path-to-bitfile>, force=True, fpga_id="100t")

I recently purchased the ChipWhisperer Husky + CW312_A7 and I try to do the same thing.
However, it is not clear to me what I am supposed to do.
I tried the example in the documentation but without any success:

import chipwhiserer as cw
scope = cw.scope()
from chipwhisperer.hardware.naeusb.programmer_targetfpga import CW312T_XC7A35T
fpga = CW312T_XC7A35T(scope)
fpga.program(<path-to-bitfile>, sck_speed=10e6)

I have the following message ImportError: cannot import name 'CW312T_XC7A35T'

I also tried the following sequence (with no more success):

import chipwhisperer as cw
scope = cw.scope()
target = cw.target(scope, cw.targets.CW305, bsfile=<path-to-bitfile>, force=True, fpga_id=None)

Here, the scope (line 2) is well found but the target (line 3) generates the following message OSError: Could not find ChipWhisperer. Is it connected?.
Is there a clear and up-to-date example on how to do this?
Thanks for your help.

2

You must be on an older chipwhisperer installation that predates this target.
Upgrading to the latest 6.0.0 release or the develop branch should resolve this.

3

Thank you for your answer !
It seems to be the good reason: I was using an old Python environment with the 5.6.0 version …

Now, when the operation is done, I still have a warning message: (ChipWhisperer Target WARNING|File programmer_targetfpga.py:154) FPGA warning: DONE pin did not go high.
What am I supposed to do with that ?

4

A common reason for this is that you’ve targeted the wrong FPGA part. It should be 7a35tcsg324.

Have you tried running our stock AES demo notebook, which will use our bitfile?