[ts-7000] RS486 and linux-2.6.21-ts

[Matthew Harrell <>]

I have one of the 7260 boards and use my own build from the linux-2.6.21-ts
source tree.  I have the RS-485 option on my board which, according to the
docs, should put it on ttyAM1.  According to the manuals (ts-7260-manual
section 5.5 and arm-linux-ts72xx section 6.3) it looks like I need to do
something like

  #include <asm/ioctls.h>
  #include <sys/ioctl.h>

  #define TIOC_SBCC485 _IOW('T',0x70,int) /*TS RTS/485 mode Clear*/
  #define TIOC_SBCS485 _IOW('T',0x71, int) /*TS RTS/485 mode Set */

  // open socket above here

  char mcr = 5;

  if ( -1 == ioctl ( _sock, TIOC_SBCS485, &mcr ) )
    cerr << "ioctl: " << strerror ( errno ) << " (" << errno << ")" << endl;

to get a half-duplex RS485 at 19200 baud.  When I try this, though, I get
the error

  ioctl: Invalid argument (22)

What am I doing wrong here?


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