1 files changed, 68 insertions, 0 deletions

diff --git a/recipes-extended/rxtx/files/usb_38400.patch b/recipes-extended/rxtx/files/usb_38400.patch
new file mode 100644
index 0000000..fffe4c5
--- /dev/null
+++ b/recipes-extended/rxtx/files/usb_38400.patch
@@ -0,0 +1,68 @@
+From: Jan Niehusmann <jan@gondor.com>
+Subject: Patch to fix setting USB-serial adapters to 38400 bps
+Bug-Debian: http://bugs.debian.org/740098
+Forwarded: no
+Description: The following patch should fix the reported issue.
+ .
+ On serial ports not supporting the TIOCGSERIAL/TIOCSSERIAL mechanism,
+ this still means that the custom baud rates do not work, but at least
+ 38400 works, again.
+ .
+ Perhaps an even better fix would be switching to the newer termios2 API,
+ as described here:
+ https://mail.python.org/pipermail/python-list/2012-October/633871.html
+ .
+ That API allows setting custom baud rates on the USB serial adapters I
+ have tested, where TIOCGSERIAL/TIOCSSERIAL was not supported.
+ .
+ But unfortunately, termios2 is not available through glibc, so one would
+ need to call linux-specific ioctls directly, which wouldn't be portable
+ at all, and I don't know how it interacts with the BSD / Hurd ports.
+ .
+ Therefore this is the minimal fix, for now.
+Upstream-Status: Pending
+
+--- a/src/SerialImp.c
++++ b/src/SerialImp.c
+@@ -872,10 +872,14 @@
+           out and select baud rates 38400 then 28800 then 38400, you will get
+           a final baud rate of 28800 because you did not update the divisor.
+ 
++          However, if the serial port doesn't support TIOCGSERIAL or custom speeds,
++          don't fail: In this case, just use B38400 and assume that there is no way
++          to set a custom speed on this port.
++
+           See the next ifdef below for the divisor.
+        */
+ #if defined(TIOCGSERIAL)
+-       if ( cspeed == B38400 )
++       if ( cspeed == B38400 && ioctl( fd, TIOCGSERIAL, &sstruct ) == 0 )
+                cspeed = 38400;
+ #endif /* TIOCGSERIAL */
+        if(     cfsetispeed( &ttyset, cspeed ) < 0 ||
+@@ -905,10 +909,9 @@
+                        return(1);
+                }
+                sstruct.custom_divisor = ( sstruct.baud_base/cspeed );
+-               cspeed = B38400;
+ #endif /* TIOCGSERIAL */
+-               if(     cfsetispeed( &ttyset, cspeed ) < 0 ||
+-                       cfsetospeed( &ttyset, cspeed ) < 0 )
++               if(     cfsetispeed( &ttyset, B38400 ) < 0 ||
++                       cfsetospeed( &ttyset, B38400 ) < 0 )
+                {
+                        /* OK, we tried everything */
+                        report( "nativeSetSerialPortParams: Cannot Set Speed\n" );
+@@ -916,8 +919,11 @@
+                }
+ #if defined(TIOCSSERIAL)
+                /*  It is assumed Win32 does this for us */
++               /*  Ignore errors if the target speed is 38400: In this case,
++                *  just assume TIOCSSERIAL is not supported and custom speeds are
++                *  not available. */
+                if (    sstruct.baud_base < 1 ||
+-               ioctl( fd, TIOCSSERIAL, &sstruct ) < 0 )
++               ioctl( fd, TIOCSSERIAL, &sstruct ) < 0 && cspeed != 38400 )
+                {
+                        return( 1 );
+                }