Lite5200 from RS232 to RS485
saurosalomoni
saurosalomoni at bol.com.br
Fri Jun 11 23:35:02 EST 2004
Hello.
I need to switch between RS232 and RS485 in my Lite5200,
but I realized it's a little bit more dificult than I
thought at first...
Well, as far as I'm concerned, I can do that just by
controling the RTS pin of my ttyS0 device to activate
the 485 module (is it 100% right?).
I began trying to control it with TIOCMGET/TIOCMSET
ioctl(), but the driver does not support hardware
handshake.. (tahnx, Denk)
So now I think I'll have to write a small driver that
uses GPIO to handle the proper PSC register.
MPC5200 Users Manual states that you can set/clear the
RTS pin with bit 7 of the OutputPort 0 (op0, offset 0x3C).
My questions:
- Is this information I gathered correct?..
- Which PSC register I need to use to control ttyS0?
- If it's easyer to do it by extending an existing
driver, wich file should I look for?
- Is there any other way to accomplish that?
Thanks in advance.
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