Transplant NTP time synchronization tool to arm linux platform to create timing tasks

Download source code

wget -c http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p14.tar.gz

Unzip and compile

./configure --prefix=$PWD/install --exec-prefix=$PWD/install --host=arm-none-linux-gnueabi CC=arm-none-linux-gnueabi-gcc --with-yielding-select=yes
make
make install

A script to compile

#!/bin/sh
HOST=arm-none-linux-gnueabi
BUILD_HOST=/home/aron566/opt/arm-2014.05/bin/arm-none-linux-gnueabi-
ARM_GCC=${BUILD_HOST}gcc
ARM_CPP=${BUILD_HOST}g++
BASE=`pwd`
OUTPUT_PATH=${BASE}/install

make_dirs () {
    
    
    #为了方便管理，创建有关的目录
    cd ${BASE} && mkdir compressed install source -p
}

download_package () {
    
    
    cd ${BASE}/compressed
    #下载包
	wget -c http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p14.tar.gz
}

tar_package () {
    
    
    cd ${BASE}/compressed
    ls * > /tmp/list.txt
    for TAR in `cat /tmp/list.txt`
    do
        tar -xf $TAR -C ../source
    done
    rm -rf /tmp/list.txt
}

make_ntp () {
    
    
  cd ${BASE}/source/ntp-4.2.8p14
	./configure --prefix=$OUTPUT_PATH/ntp-4.2.8p14 --exec-prefix=$OUTPUT_PATH/ntp-4.2.8p14 --host=$HOST CC=$ARM_GCC --with-yielding-select=yes
	make
	make install
}

make_dirs
download_package
tar_package
make_ntp
exit $?

Upload files to the development board

Executable under the bin directory under the install directory

Copy to the /usr/bindirectory of the development board

run

Synchronize time command

ntpdate time.buptnet.edu.cn

Use date to view time

After the date command is viewed, UTC time (Universal Standard Time) is displayed, which is 8 hours away from Beijing Time (CST=UTC+8), so you need to set the time zone

Set time zone

After copying /usr/share/zoneinfo/Asiathe files in the ubuntu system directory Shanghaito the development board directory /etcand renamed localtimeit, use the command to rebootrestart

You can use the command to display UTC time

date -u

The system time obtained from the network is written into the hardware clock

hwclock -w

Create startup items

S92crontabAdd to the /etc/init.ddirectory, add executable permissions

#!/bin/sh
#无需修改
DIRECTORY_NAME=/etc/crontabs
#无需修改
CONFIG_NAME=$DIRECTORY_NAME/root
#运行时配置，无需修改
RUN_DIRECTORY_NAME=/var/spool/cron/crontabs
RUN_CONFIG_NAME=$RUN_DIRECTORY_NAME/root

#定时任务
TASK_1="*/1 */1 */1 */1 */1 ntpdate time.buptnet.edu.cn"
TASK_2="*/1 */1 */1 */1 */1 hwclock -w"
start() {
    
    
	#是否存在定时任务配置目录
	if [ ! -d "${DIRECTORY_NAME}" ];then
		mkdir $DIRECTORY_NAME -p
		touch $CONFIG_NAME
		chmod 777 $CONFIG_NAME
		echo $TASK_1>>$CONFIG_NAME
		echo $TASK_2>>$CONFIG_NAME
	fi
	mkdir -p $RUN_DIRECTORY_NAME
	cp -p $CONFIG_NAME $RUN_CONFIG_NAME
	chmod 777 $RUN_CONFIG_NAME
	crond
	[ $? = 0 ] && echo "START Crontabs OK" || echo "START Crontabs FAIL"
}
stop() {
    
    
	echo "STOP Crontabs"
}
restart() {
    
    
	stop
	start
}

case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  restart|reload)
	restart
	;;
  *)
	echo "Usage: $0 {start|stop|restart}"
	exit 1
esac

exit $?

Note that files written on windows may need to execute the following commands

dos2unix S92crontab #消除断元符

ntp server

1. Ensure that the network connection between the development board of the ntp server and the system of the ntp client is normal

2. Edit the file on the development board where the server is to be /etc/ntp.conf
executed and execute the command:

vi  /etc/ntp.conf 
#restrict default nomodify notrap noquery 
restrict 127.0.0.1 
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap 
server  127.127.1.0        # local clock 
fudge   127.127.1.0  stratum 5 
driftfile /var/lib/ntp/drift 
broadcastdelay   0.008 
keys                     /etc/ntp/keys

3. Then open the ntp server

ntpd  -c /etc/ntp.conf

4. After the ntp server is turned on, the following commands can be executed in the client system for five to ten minutes, otherwise the time synchronization will fail

ntpdate  192.168.1.48  #192.168.1.48修改成你的服务器的IP地址