forked from brl/citadel
61 lines
1.5 KiB
Bash
Executable File
61 lines
1.5 KiB
Bash
Executable File
#!/bin/sh
|
|
|
|
# Copyright (C) 2014 Intel Corporation
|
|
#
|
|
# Released under the MIT license (see COPYING.MIT)
|
|
|
|
if [ "$1" = "" -o "$1" = "--help" ] ; then
|
|
echo "Usage: $0 <serial terminal command>"
|
|
echo
|
|
echo "Simple script to handle maintaining a terminal for serial devices that"
|
|
echo "disappear when a device is powered down or reset, such as the USB"
|
|
echo "serial console on the original BeagleBone (white version)."
|
|
echo
|
|
echo "e.g. $0 picocom -b 115200 /dev/ttyUSB0"
|
|
echo
|
|
exit
|
|
fi
|
|
|
|
args="$@"
|
|
DEVICE=""
|
|
while [ "$1" != "" ]; do
|
|
case "$1" in
|
|
/dev/*)
|
|
DEVICE=$1
|
|
break;;
|
|
esac
|
|
shift
|
|
done
|
|
|
|
if [ "$DEVICE" != "" ] ; then
|
|
while true; do
|
|
if [ ! -e $DEVICE ] ; then
|
|
echo "serdevtry: waiting for $DEVICE to exist..."
|
|
while [ ! -e $DEVICE ]; do
|
|
sleep 0.1
|
|
done
|
|
fi
|
|
if [ ! -w $DEVICE ] ; then
|
|
# Sometimes (presumably because of a race with udev) we get to
|
|
# the device before its permissions have been set up
|
|
RETRYNUM=0
|
|
while [ ! -w $DEVICE ]; do
|
|
if [ "$RETRYNUM" = "2" ] ; then
|
|
echo "Device $DEVICE exists but is not writable!"
|
|
exit 1
|
|
fi
|
|
RETRYNUM=$((RETRYNUM+1))
|
|
sleep 0.1
|
|
done
|
|
fi
|
|
$args
|
|
if [ -e $DEVICE ] ; then
|
|
break
|
|
fi
|
|
done
|
|
else
|
|
echo "Unable to determine device node from command: $args"
|
|
exit 1
|
|
fi
|
|
|