@jpm Sadly, Segger only supports (right now) the CH32H parts (which are Arm chips). Which is weird, because they do support a ton of RISC-V chips as well.
Discussion
Replies:
5
@petrillic you do NOT want to know how WCH does it. It’s… not great. And WAY slower than even using a 9600 baud UART in polling mode.
@jpm what horrors await! 😊 I mean, I guess it's "acceptable" for printf() logging, but definitely useless for tracing.
Then again, I'd expect Segger to know what they're doing.
The wiki seems to imply the overhead/latency of RTT is multiple orders of magnitude better than SWO even.
@petrillic yeah Segger RTT performs pretty well on the ARM platforms I’ve used it on, especially when used with that quasi-host-side logging thingo that Rust does that I can’t remember what it’s called right now.
@jpm I do have some projects with WCH chips on the back burner right now. But fortunately they're "simple" enough that even that shooud be OK. Or I may just pull a UART out anyway. I have a footprint for TC2050 that can handle either USB or UART. Forgot who I stole that idea from.
@petrillic yeah the WCH hardware debugger is a piece of shit, and on any WCH part “bigger” than a CH32V003 they use their own undocumented debugging protocol which kinda sorta vaguely looks like SWD that only works with their own debugger.
And talk about coincidence, right now I’m laying out a TC-2050 pinout I’ve used in the past that connects SWD, UART, and power.
