No trigger seen when capture the trace

[rainxidian]

I wrote two files, simpleserial-xor and Makefile, according to the official documentation doc.

And compile them into hex files on the CW308_STM32F3 platform, and import them into the hardware according to the code in Lab2_A. But I couldn’t capture the energy trace, showing “No trigger seen”.

Could anyone tell me how to correctly capture energy traces？

simpleserial-xor code

The only change is that the order of simpleserial_addcmd('k', 16, buf) and simpleserial_addcmd('p', 16, buf) has been exchanged relative to the document you provided.(The reason why I exchanged them is I think the key should be read first)

Makefile code

By above I got my hex file.

My Lab code

These codes are provided by the Lab2_A

It can be seen that the hex file was been upload to the hardware successfully

But can not capture the traces

I dont know what I did wrong, hoping for your help!Thanks!

[Alex_Dewar]

Simpleserial V2 actually uses 0x01 for both the key and plaintext, then uses the scmd field to determine which to write to.

[rainxidian]

Alex Thanks for your reply.
As you said, if I have a function called “getkey” which is for reading key stream(the key buffer “key[16]” have been created),like “key[i]=k[i]” .

I want to know whether i need to code"simpleserial_addcmd(0x01, k, 16, getkey);".

[Alex_Dewar]

No, scmd is a field that is passed to getkey (or any other callback you use), not to simpleserial_addcmd. I’d recommend taking a look at simpleserial-aes to see how this field is used.

Alex