Ah, I get it. 'read -n1' is the way.
On Fri, May 17, 2013 at 12:19 PM, Magicloud Magiclouds
<magicloud.magiclo...@gmail.com> wrote:
Hi,
Say I have device /dev/ttyACM0. If I `stty -F /dev/ttyACM0 raw`, then `cat /dev/ttyACM0`
in one term, and `echo -e "QUERYCOMMAND" > /dev/ttyACM0` in another term. I
would get the data in first term.
But if echo first, then cat. The data seemed lost. Cat would not get
anything. So I think these two commands must be run at the same time.
So I put this process be in a script like this:
(stty -F $tty raw
currentSettings=""
while [ 1 ]
do
c=`dd if=$tty count=1`
currentSettings=${currentSettings}${c}
if [ c == '.' ]
then
break
fi
done
echo -n $currentSettings > $conf) &
echo -e "${query}?." > $tty
until [ -e $conf ]
do
sleep 1
done
currentSettings=`cat $conf`
The script stuck at dd, it did not get anything.
What should I do?
You might be interested in a utility called 'chat', that is part of the
'ppp'-package.
It is meant for scripts like this.
HTH, --Jasper.
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