uart_cu.sh

if [ -e /dev/ttyUSB* ] ;then
sudo chmod 777 /dev/ttyUSB*
fi
cu_stat=''
NAMEPATH=${0%/*}/.name$1
USERLOGPATH=${0%/*}/.userlog

echo_info()
{
    cd /dev
    echo 当前主机连接的设备有：
    echo --------------------------
    if [ -e /dev/ttyUSB* ] ;then
        ls ttyUSB*
    else
        echo 同学，没有串口连接啦！
    fi
    echo --------------------------
    echo 
    echo 请使用uart [0-9]+$1串口 
    echo 例如：uart 0 $2 来$1串口0'('ttyUSB0')'
    echo 例如：uart 1 $2 来$1串口1'('ttyUSB1')'
    exit 0
}
cu_off() 
{
cu_stat=(`ps -aux|grep  "cu -l /dev/ttyUSB$1 -s 115200"|awk '{print $2}'`)
# kill  `ps -a |grep cu|awk '{print $1}'`
if [ $# == 2  ];then
    echo_info 释放 $2
else
    if [ ${#cu_stat[*]} == 1 ] 
    then
        echo 
        echo UART$1未使用 无需释放
        echo
    else
        cu_stat=(`ps -aux|grep  "cu -l /dev/ttyUSB$1 -s 115200"|awk '{print $2}'`)
        kill ${cu_stat[0]}
        kill ${cu_stat[1]}

        sleep 2
        echo
        echo UART$1释放成功
        echo
    fi  
fi
}

def_stat=""
stat=n
name=""
killall()
{
            kill ${cu_stat[0]}
            kill ${cu_stat[1]}
            ret=(`ps -aux|grep  "cu -l /dev/ttyUSB$1 -s 115200"|awk '{print $2}'`)
            echo 杀除进程
            # while [ ${ret}x != ${def_stat}x ]
        while [ ${#ret[*]} != 1 ]
        do
            kill ${ret[0]}
            sleep 3
            ret=(`ps -aux|grep  "cu -l /dev/ttyUSB$1 -s 115200"|awk '{print $2}'`)
        done
            #  if [ ${ret}x == ${def_stat}x ]
        if [ ${#ret[*]} == 1 ]
            then
            echo 开始强占
            sleep 1
            echo ttyUSB0 115200 
            cu -l /dev/ttyUSB$1 -s 115200
            date >> ${USERLOGPATH}
            echo UART$1 ${name} release >> ${USERLOGPATH}
            echo >> ${USERLOGPATH}
        else
            kill ${cu_stat[0]}
            kill ${cu_stat[1]}
            echo 开始强占...
            sleep 2
            echo ttyUSB0 115200 
            cu -l /dev/ttyUSB$1 -s 115200
            date >> ${USERLOGPATH}
            echo UART$1 ${name} release >> ${USERLOGPATH}
            echo >> ${USERLOGPATH}
        fi

}

getusrname()
{

    if [ ! -e  ${NAMEPATH} ];then
        echo 无法定位使用者
    elif [ $# != 1 ];then
        OLD_NAME=`cat ${NAMEPATH}`
        echo 当前使用者: ${OLD_NAME}
    fi
    read -p "who are you:" name
    if [ ${name}X == ${def_stat}X ];then
        getusrname $1
    else
        # echo -${OLD_NAME}-
        # echo -${name}-
        # if [ ${name}X != ${OLD_NAME}X ];then
            echo -*********************************
            echo 释放串口请使用  ~. 这个.一定要输入
            echo 或者在另一处终端使用 uart 0-9 off
            echo -*********************************
            echo ${name} > ${NAMEPATH}
            date >> ${USERLOGPATH} 
            echo UART$1 ${name} >> ${USERLOGPATH} $2
        # fi
    fi
}
if [ $# == 0  ];then
    echo_info 启动
elif [ $# == 2 -a "$2"=="off"  ];then
    cu_off $1
    cu_off $1 'off'
    exit 0
else
    cu_stat=(`ps -aux|grep  "cu -l /dev/ttyUSB$1 -s 115200"|awk '{print $2}'`)
fi

if [ ${#cu_stat[*]} == 1 ]
then

    if [ ! -e "/dev/ttyUSB$1" ]
    then
    echo -*****************
    echo UART$1串口未连接
    echo -*****************
    else
        getusrname $1
        echo UART$1连接中。。。
        cu -l /dev/ttyUSB$1 -s 115200
        date >> ${USERLOGPATH}
        echo UART$1 ${name} release >> ${USERLOGPATH}
        echo >> ${USERLOGPATH}
    fi
else
    echo 申请UART$1
    echo ------------------注意--------------------
    read -p "UART$1被使用中，强占否(yes(y)/no(n)):" stat
     case $stat in
    y)
        getusrname $1 抢占使用
        killall $1
    ;;
    yes)
        getusrname $1 抢占使用
        killall $1
    ;;
        *)
        echo    放弃使用
        echo  已停止使用串口
    ;;
     esac
fi