External Trigger by SMB on ChipSHOUTER Connected to ChipWhisperer Lite

[KevinQhv]

Hi,

I am trying to use the external trigger via the SMB connection on the ChipSHOUTER while connected to the ChipWhisperer Lite. However, the trigger does not seem to work as expected.

Here is what I have attempted:

Configuration on ChipSHOUTER:
Armed the device.
Set hwtrig_term and hwtrig_mode parameters to False.

Configuration on ChipWhisperer:
Set scope.glitch.output to "enable_only".
Enabled scope.io.glitch_lp by setting it to True.
Configured additional parameters:
scope.glitch.repeat = 1
scope.glitch.ext_offset = 0

Observations:
I tried various combinations of parameters, but none of them successfully generated a pulse on the ChipSHOUTER.
Specifically, when manipulating scope.glitch.trigger_src to different modes such as 'ext_single' and 'ext_continuous', I observed no significant activity around 3.3V on the SMA Glitch port of the ChipWhisperer, as measured with a PicoScope.

Request:
Could you confirm if there are any additional parameters that need to be configured to enable the external trigger properly?
Any guidance on troubleshooting this setup would be greatly appreciated.

Thank you!

[alex-dewar]

Can you confirm that the ChipWhisperer is actually triggering? You should keep trigger_src set to 'ext_single' as this requires you to arm the ChipWhisperer before the glitch will fire. You can check the result of the trigger with scope.capture().

Can you also share your full ChipWhisperer setup (print(scope))

[KevinQhv]

I observe the SMA port glitch on ChipWhisperer which send to ChipSHOUTER Trigger SMB.
I tried with trigger_src to continuous, but i don't observe +3.3V on this SMA glitch port.

Can you tell me what type of signal the SMA glitch port on the ChipWhisperer should send to pulse the ChipSHOUTER. Which parameters it needs on ChipWhisperer and ChipSHOUTER in according to trigger ?

There are print(scope) of ChipWhisperer:

cwlite Device sn = 442031204c5032433030393137323036 fw_version = major = 0 minor = 64 debug = 0 gain = mode = low gain = 0 db = 5.5 adc = state = True basic_mode = low timeout = 2 offset = 0 presamples = 0 samples = 24400 decimate = 1 trig_count = 2690280908 fifo_fill_mode = normal 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 tio_states = (1, 0, 0, 1) cdc_settings = bytearray(b'\x01\x00\x00\x00') glitch = clk_src = clkgen width = 10.15625 width_fine = 0 offset = 10.15625 offset_fine = 0 trigger_src = ext_continuous arm_timing = after_scope ext_offset = 0 repeat = 1 output = enable_only

[alex-dewar]

It looks like you haven't done any setup on your ChipWhisperer. Try running scope.vglitch_setup("lp") before trying your glitch.

There should be a pullup resistor to 3.3V with those ChipShouter settings. The ChipWhisperer has an open drain glitch, which should pull the ChipShouter's glitch low.