SERIAL_IMX in RS485 mode - EOT, read back

[Adam Rudziński <adam.rudzinski@xxxxxxxxxx>]

Hello Guys,

could you, please, give me also a hint on how to get some information 
from the serial port driver?

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?

2) On half-duplex RS485 bus collisions are possible. A way to detect 
them could be to listen while transmitting. Here, I think, the preferred 
way would be to have it done in the driver, which could compare sent and 
received bytes and have a collision flag somewhere. Is it already 
implemented, or is there any good place for that? And how do I access 
that from application?

Best regards,
Adam