diff options
Diffstat (limited to 'recipes-extended/rxtx/files/usb_38400.patch')
| -rw-r--r-- | recipes-extended/rxtx/files/usb_38400.patch | 68 |
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 ); + } |