Hi, I am working on a BM13xx High Level Analyzer for Saleae Logic 2. You can find it on Saleae Logic 2 market place as an extension (and also in GH : https://github.com/GPTechinno/bm13xx-hla). Maybe you can have a use of it

Currently, basic communicatin (FIL/VIL mode, R/W register, manage chip address, job/nonce) is well handled. I am digging into the register functions and fields now.

I am sure your level of knowledge on the BM13xx serial protocol is higher han mine, but such a practical tool can be handy for your dev also.

Let me know what you think about it.