> I did the same thing with an 860T. All we needed was the RTS pin > (inverted). We used the standard driver and everything worked fine. I did > do a little ioctl stuff but no driver changes.
The point is that the driver I'm using does not support ioctl. What I would like to know is how to set RTS without using ioctl. I know there is a way, but I couldn't find it yet... >Here is the hello file I > started with. Good luck > > -----Original Message----- > From: owner-linuxppc-embedded at lists.linuxppc.org > [mailto:owner-linuxppc-embedded at lists.linuxppc.org] On Behalf Of > saurosalomoni > Sent: Friday, June 11, 2004 6:35 AM > To: linuxppc-embedded at lists.linuxppc.org > Cc: iida at ztec.com.br > Subject: Lite5200 from RS232 to RS485 > > > 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. > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
