我试着在并行口上测量两个信号之间的时间差,但首先我要知道我的测量系统( Athlon(tm) 64 X2双核处理器5200+×2)在SUSE 12.1 x64上有多精确。
因此,在阅读了一些之后,我决定使用clock_gettime(),首先使用以下代码获得clock_getres()值:
/*
* This program prints out the clock resolution.
*/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main( void )
{
根据我到目前为止所知道的情况,当您将IO设备插入IO端口(例如,将打印机插入并行端口时),打印机将作为另一个RAM芯片表示到CPU。
因此,如果要创建与打印机通信的设备驱动程序,设备驱动程序将包含的指令只是将数据存储到打印机的内存位置的指令,以及从打印机的内存位置加载数据的指令。
但是,您能通过直接操作并行口的引脚将数据发送到打印机吗?也就是说,CPU是否有这样的指令:
send the number 3 to pin 0 of parallel port 1
我使用的是Ubuntu16.04。我想安装一个与ROS相关的"apt-get安装“包,但是它不起作用。终端机上写着如下。
$ sudo apt-get install ros-kinetic-libuvc
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have
npm install node-sass
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Math.random() in certain circumstances, which is known to be problematic. See https://v8.dev/blog/math
npm ERR! code 1
npm ERR! path D:\Portals\SALAM_DMS\finger\node-java\node_modules\java
npm ERR! command failed
npm ERR! command C:\Windows\system32\cmd.exe /d /s /c node-gyp rebuild
npm ERR! gyp info it worked if it ends with ok
npm ERR! gyp info using node-gyp@8.3.0
npm ERR! gyp info using node@16.1
我已经将PYTHON_TARGETS="python2_7 python3_5 python3_4"添加到我的/etc/portage/make.conf中。
当尝试安装任何支持python目标的程序时,会发生以下情况:
sudo emerge --ask dev-python/google-api-python-client
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild N ] dev-python/httplib2
我正在尝试使用sudo apt-get upgrade命令升级我的raspbian,但是它总是会导致这个错误
我尝试了这个命令sudo dpkg --configure -a,它显示了相同的错误
我再次尝试对每个包进行一次配置,但没有结果。如何配置dpkg??
dpkg: error processing package python-idna (--configure):
package is in a very bad inconsistent state; you should
reinstall it before attempting configurati
我已经在我的ubuntu14.04上安装了python2.7.5。然后我想安装virtualbox (或任何其他应用程序),但是我得到了这个错误:
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
apt-xapian-i
在克隆我的项目之后,我尝试安装不同的包并运行它,但不幸的是,在安装依赖项时,会遇到这些错误。我无法安装任何依赖项或其他任何东西。有人知道这是怎么回事吗?提前谢谢
npm WARN deprecated request@2.81.0: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Ma