Re: SERIAL_IMX in RS485 mode - EOT, read back

[Adam Rudziński <adam.rudzinski@xxxxxxxxxx>]

> 1) Since RS485 is half-duplex, it is necessary to share transmission 
> time with other devices. I think that for reasons of flexibility the 
> preferred solution would be to control that from application, not from 
> the driver. But to do that properly, the information that the TX 
> buffer is empty would be welcome (note: not that TX buffer can accept 
> more bytes, but that there are no more left for sending out). Is it 
> available somewhere already?

Probably the way to go is tcdrain(). Does it really wait until hardware 
completes the transmission, or some "intermediate" buffer becomes empty?

Best regards,
Adam