[chirp_devel] [PATCH] [New Model] Add Support for Retevis RT23 Radio

[Dan Smith]

> The other thing to try is setting the latency of your USB serial adapter
> in the driver advanced tab. I have car tuning gear that requires this.
> 
> By default the latency setting is a bit high for a lot of USB serial
> dongles. It increases efficiency at the cost of reduced speed. Akin to
> the Nagle algorithm in networking maybe? 

You mean turn _up_ the latency to slow things down a bit? If so, then
that's worth a try.

IMHO, this really smells like a flow control problem. Either the radios
are expecting XON/XOFF and we're not doing it, or some of the
chips/drivers are not signaling to the line discipline that their UART
buffer is full and thus they're getting overwritten. The latter is more
likely given that 9600 baud is really slow and most of the radios should
be able to ingest that stream without needing us to slow down.

If this is really a pervasive problem with drivers or USB devices,
perhaps we should just write a generic throttled serial class, and let
people opt-in to using that with a given flow rate. It'd be interesting
to know if writing 8/16 bytes at a time, and timing it for 10% higher
than the time it should take to flush that at the current baudrate helps
all of these problems universally.

--Dan