Uncovering Secrets Of Logitech M185’s Dongle

[endes0] has been hacking with USB HID recently, and a Logitech M185 mouse’s USB receiver has fallen into their hands. Unlike many Logitech mice, this one doesn’t include a Unifying receiver, though it’s capable of pairing to one. Instead, it comes with a pre-paired CU0019 receiver that, it turns out, is based on a fairly obscure TC32 chipset by Telink, the kind we’ve seen in cheap smart wristbands. If you’re dealing with a similarly obscure MCU, how do you even proceed?

This is a companion discussion topic for the original entry at https://hackaday.com/2024/06/15/uncovering-secrets-of-logitech-m185s-dongle/