Choose between Raspberry Pi 4B 4GB and ROCKPro64

[Bernd Walter]

On Wed, Nov 13, 2019 at 01:42:13PM -0700, Ian Lepore wrote:
> On Wed, 2019-11-13 at 17:48 +0100, Bernd Walter wrote:
> > I just remembered that I own an FTDI FT4232H module.
> > This one is capable of 12Mbps with 2k Buffers and high speed USB.
> > I have it at a different location - guess I will have to drive and
> > pick it up.
> 
> You'll certainly have no trouble with the ftdi 4232.  I've tested those
> at 6mpbs in both directions concurrently without any data loss.
> 
> IMO, breaking free of the 115200 barrier is long overdue, but it would
> have been nice if the step up everyone took was to 921600, because
> virtually all usb-serial support that.  With line-level rather than
> ttl-level adapters, 1mpbs is often the effective speed limit because of
> the cheap rs232 line-level chips they use.

I don't think many USB uarts are capable to divide 48MHz into 921600 *
oversampling without being off too much.
The high speed ones are a different beast, since they likely have a
PLL and run with an internal 480MHz clock.

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.