Using Beagle board as external trigger for ChipSHOUTER

1

Hi,
I want to trigger my ChipShouter through the ChipWhisperer using the trigger output from a Beagle USB 5000 V2. I hooked the Beagle using Out4 to pin 16 (tio4) on the Target-IO port on my CWLite (and ground to ground). Beagle is sending an active high signal which I can verify on my oscilloscope. The ChipShouter is connected through the SMA connector with the glitch output of the ChipWhisperer.

I used the python library to setup my scope like this:

cwlite Device
gain =
mode = low
gain = 0
db = 5.5
adc =
state = False
basic_mode = low
timeout = 2
offset = 0
presamples = 0
samples = 24400
decimate = 1
trig_count = 2428084156
clock =
adc_src = clkgen_x1
adc_phase = 0
adc_freq = 96000000
adc_rate = 96000000.0
adc_locked = True
freq_ctr = 0
freq_ctr_src = extclk
clkgen_src = system
extclk_freq = 10000000
clkgen_mul = 2
clkgen_div = 1
clkgen_freq = 192000000.0
clkgen_locked = True
trigger =
triggers = tio4
module = basic
io =
tio1 = serial_tx
tio2 = serial_rx
tio3 = high_z
tio4 = high_z
pdid = high_z
pdic = high_z
nrst = high_z
glitch_hp = False
glitch_lp = False
extclk_src = hs1
hs2 = glitch
target_pwr = True
glitch =
clk_src = clkgen
width = 10.15625
width_fine = 0
offset = 10.15625
offset_fine = 0
trigger_src = ext_single
arm_timing = after_scope
ext_offset = 0
repeat = 1
output = glitch_only

But the CW is not triggering the CS. Which configuration of the CW is wrong?

2

Hi,

You’ll need to enable either glitch_hp or glitch_lp to actually see anything on the glitch output of the ChipWhisperer. Also, not sure if you’ve accounted for this in your glitch setup, but the ext_single setting requires the ChipWhisperer to be armed before each glitch. Setting trigger_src to ext_continuous instead will trigger the glitch every rising edge of the trigger.

Let me know if that resolves things,

Alex

3

Thank you for your helpful reply.

Unfortunately this does not fix my problem. Maybe I do something fundamentaly wrong here.
Here is my full setup for the CW:

import chipwhisperer as cw

scope = cw.scope()
scope.glitch.output = “glitch_only”
scope.io.hs2 = “glitch”
scope.glitch.trigger_src = “ext_continuous”
scope.glitch.output = “clock_xor”
scope.glitch.clk_src = “clkgen”
scope.trigger.triggers = ‘tio4’

scope.io.glitch_lp = True
scope.arm()

4

Hi,

Can you try the following settings?

scope = cw.scope()
scope.default_setup()
scope.glitch.clk_src = "clkgen"
scope.glitch.output = "enable_only"
scope.glitch.trigger_src = "ext_continuous"
scope.io.glitch_lp = True
scope.trigger.triggers = "tio4"

A few notes about this setup:

  • scope.default_setup() will set the ChipWhisperer’s clock to 7.37MHz, and scope.glitch.output = "enable_only" will make it so a glitch will keep the glitch port low for a full clock cycle.
  • The trigger will be active low coming out of the ChipWhisperer

Alex