Texas Instruments makes the EV2300—a USB-to-I2C adapter for talking to their battery management ICs. It’s the standard tool for the BQ76920/BQ76940 evaluation boards. Plug it in, fire up bqStudio (TI’s official GUI), read some registers, write some registers. Simple.
Read more →This one is less of an adventure story and more of a debugging post-mortem. The MR18 saga had 23 bugs over a full week. This had 0 bugs in the fix—just a two-line kernel patch—but the debugging got deep into USB audio internals and Linux kernel source code.
Read more →“started from the bottom now we’re here” — Drake
In Part 1 I reverse engineered the EV2300’s HID protocol and built a pure-Python driver that talks to the real adapter without TI’s DLLs. That solved the “no scripting interface” problem—but we still needed the physical EV2300 hardware. At $200 a pop, with a supply chain that’s been spotty since 2020, that’s not great for a university lab with 30 students.
Read more →“I’ve been through the desert on a horse with no name” — America
After Part 2 I had bqStudio reading registers through the STM32 bridge. The silent command fixes got the GUI working. But the DLL path—bq80xrw.dll’s ReadSMBusWord—still returned “EV2X00 Adapter USB Timeout” every single time.