BeagleBone BLUE：如何在启动时启动磁力计

如何解决BeagleBone BLUE：如何在启动时启动磁力计

我制作了一个小的Python3脚本来记录MPU9250的磁性数据。我可以通过

将其作为服务启动

debian@beaglebone:~$ sudo systemctl start logdata.service 
debian@beaglebone:~$ sudo systemctl status logdata.service 
● logdata.service - Logging of 6D-Sensor to SD-card
   Loaded: loaded (/lib/systemd/logdata.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2020-09-20 10:32:19 UTC; 16s ago
 Main PID: 1622 (python3)
    Tasks: 1 (limit: 1026)
   Memory: 9.9M
   CGroup: /system.slice/logdata.service
           └─1622 python3 /var/lib/cloud9/oe8bck/imu.py

Sep 20 10:32:19 beaglebone systemd[1]: Started Logging of 6D-Sensor to SD-card.

但是在启动时启用它并不会启动：

debian@beaglebone:~$ sudo service logdata status
[sudo] password for debian: 
● logdata.service - LSB: log sensor data to SD-card
   Loaded: loaded (/etc/init.d/logdata; generated)
   Active: active (exited) since Sun 2020-09-20 09:40:18 UTC; 1min 38s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 550 ExecStart=/etc/init.d/logdata start (code=exited,status=0/SUCCESS)

Sep 20 09:40:36 beaglebone logdata[550]: /usr/local/lib/python3.7/dist-packages/rcpy-0.5.1-py3.7-linux-armv7l.egg/rcpy/__init__.py:127: UserWarni
Sep 20 09:40:36 beaglebone logdata[550]:   warnings.warn('> Installing signal handlers')
Sep 20 09:40:36 beaglebone logdata[550]: Press Ctrl-C to exit
Sep 20 09:40:36 beaglebone logdata[550]: Bye BeagleBone!
Sep 20 09:40:36 beaglebone logdata[550]: Traceback (most recent call last):
Sep 20 09:40:36 beaglebone logdata[550]:   File "/var/lib/cloud9/oe8bck/imu.py",line 59,in <module>
Sep 20 09:40:36 beaglebone logdata[550]:     data=mpu9250.read()
Sep 20 09:40:36 beaglebone logdata[550]: mpu9250.error: Failed to read magnetometer data
Sep 20 09:40:36 beaglebone logdata[550]: Initiating cleanup...
Sep 20 09:40:36 beaglebone logdata[550]: Done with cleanup

在脚本中添加等待状态没有帮助，因此我认为守护程序是在正确初始化I2C总线之前启动的。哪个服务提供此服务？

非常感谢您的提示！

KR， 克里斯托夫

解决方法

sudo systemctl启用MyService.service

我找到了此信息。在这些地址上在线获取有关在Linux上设置服务文件的信息。

• https://www.digitalocean.com/community/tutorials/how-to-use-systemctl-to-manage-systemd-services-and-units
• https://www.freedesktop.org/software/systemd/man/systemd.service.html

因此，sudo systemctl start MyService.service使.service文件在当前会话期间正常工作。

然后，sudo systemctl enable MyService.service在重新引导或引导系统时使.service文件在引导期间工作。

如果您需要更多信息，请询问。

P.S。当我使用/ etc / systemd / system作为我的文件位置来启动/引导时，我还看到您正在使用/etc/init.d ...