Re: [PATCH v3] USB: Add uPD78F0730 USB to Serial Adaptor Driver

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On Tue, Jan 17, 2017 at 04:25:18PM +0300, Maksim Salau wrote:
> Hi Johan,
> 
> > I think it's right to keep them as in the current version of the patch
> > (i.e. active high) which is accordance with the datasheet, but if
> > possible you should verify the levels when using hardware flow control
> > to be certain that the polarity is not inverted when enabling hardware
> > flow control.
> 
> It seems to me that CTSRTS flow control is not implemented
> in the device I have. I tried to send lots of data to cause level change
> of the RTS signal with no success. Also I tried to:
> 1. open port;
> 2. disable CTSRTS flow control;
> 3. set RTS to a specific level;
> 4. enable CTSRTS flow control;
> 5. send some data.
>
> I tried the sequence above with RTS set and reset, and I can conclude that
> step 4 doesn't affect RTS signal at all.

Ok, thanks for testing. Better leave CRTSCTS unimplemented for now then.

And keep the current modem-control-signal polarity. What are the levels
of these signals when coming out of reset (i.e. after having connected
the device, but not opened it yet)?

Thanks,
Johan
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