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?
> --
> 竹密岂妨流水过
> 山高哪阻野云飞
>
> And for G+, please use magiclouds#gmail.com.
>
--
竹密岂妨流水过
山高哪阻野云飞
And for G+, please use magiclouds#gmail.com.
