Okay – I admit it. I’ve been absent for far too long. Would you beliee me if I told you, I had *erm* reasons?
Yeah, didn’t think so 😀
Alright, so – my lazy ass was exactly that: lazy. This morning, I just couldn’t stand the Nexus’ puppy-eyes and got cracking a bit.
Before I went in hibernation, I managed to order a bunch of tools / toys that might make prodding and poking a bit easier. This morning, I hooked up the 2nd (!!!) TRRS-Cable to the breadboard and slapped the buspirate on the other end to figure out the cable’s pinout the old-fashioned way. Needless to say that I got a big fat middle finger stuck in my face by the whole setup.
When I set the buspirate to UART with 3V and try to loop the RX/TX through the cable, the entire thing basically goes nuts. It seems as if the shielding isn’t strong enough to handle the current that is going through, even though the cable is basically the stuff the Accuvant guys used for gaining debug-access on the Nexus 4. The data I send over the buspirate are – to a certain extent – echoed throughout all 4 wires…
I have a theory that it might also be due to the flimsy wires connecting the buspirate to the breadboard – I will slap the regular UART/USB-converter on it and try the same setup tomorrow.
According to Tassadar, who got the Nexus 5 to switch into debug-mode, the Nexus 5 needs a proper slap with approx. 3.3V to get the memo and pick up the phone. I’ll spend the rest of my overbearing day at work (running out of synonyms for “bored out of my mind” -_-) looking for something that might resemble a service-manual. Maybe someone at ASUS forgot it somewhere? 🙂
In the meantime, if you guys have any input regarding the wiring / echo-issue, please share.
D (who’s surprisingly undercaffeinated – even after 5 mugs…)