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serialhdl: Clear "hupcl" bit from serial port

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The arduino style serial port interfaces can reset the MCU when the
serial port is opened.  Clearing the HUPCL flag makes this less
likely.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2016-12-09 19:04:30 -05:00
parent cad1e0b985
commit 74fa8a3907
2 changed files with 8 additions and 1 deletions
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6
klippy/util.py
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@ -16,6 +16,12 @@ def set_nonblock(fd):
fcntl.fcntl(fd, fcntl.F_SETFL
, fcntl.fcntl(fd, fcntl.F_GETFL) | os.O_NONBLOCK)
# Clear HUPCL flag
def clear_hupcl(fd):
attrs = termios.tcgetattr(fd)
attrs[2] = attrs[2] & ~termios.HUPCL
termios.tcsetattr(fd, termios.TCSADRAIN, attrs)
# Support for creating a pseudo-tty for emulating a serial port
def create_pty(ptyname):
mfd, sfd = pty.openpty()