8

precise timing in C

view full story
linux-howto

http://stackoverflow.com – I have a little code below. I use this code to output some 1s and 0s (unsigned output[38]) from a GPIO of an embedded board. My Question: the time between two output values (1, 0 or 0, 1) should be 416 microseconds as I define on clock_nanosleep below code, I also used sched_priority() for a better time resolution. However, an oscilloscope (pic below) measurement shows that the time between the two output values are 770 usec . I wonder why do I have that much inaccuracy between the signals? PS. the board(beagleboard) has Linux 3.2.0-23-omap #36-Ubuntu Tue Apr 10 20:24:21 UTC 2012 armv7l arm (HowTos)

dadebian's picture
Submitted by dadebian on 02/08/2013 – Made popular on 02/08/2013

Stories similar to precise timing in C

Hi,

I am starting to use R to create data plots using the ggplot2 package rather than the standard plot function that comes with R.

Hi All,

Probably a basic question here, but I'm confusing myself with the time() function in python.

I want to add a column to the output of the following code with the time since the program was activated before the temperature given.

Am using a find command in my script .The output may be one or more. I need to store those values in a array and need to access those. Am unable to find the solution . Any help on this will be helpful.

if [condition] < code> else a=<find command output which gives the file name either 1 or more> if 1 or more values need to perform task on each value.

Passing awk variables to shell 1 year 11 weeks ago

Hi. I need to parse file and assign some values to variables, right now i do like below

Code: MYHOMEDIR=`awk '/Home/ {print $NF}' output.txt` MYSHELL=`awk '/Shell/ {print $NF}' output.txt` PRGRP=`awk '/Primary/ {print $NF}' output.txt` SECGRP=`awk '/Second/ {print $NF}' output.txt` In this case, AFAIK, output.txt is being opened 4 times.

Hello! I have a code in my bash script

Code: OUTPUT=""`yum update` echo $OUTPUT echo $OUTPUT >> mylogfile

Code: yum update is a very long command and without my script it always output something to console, but in my script it starts, for the long time nothing outputs and after a while outputs a lof of data. Is any way in my script to output data as soon as it

I've a text file with below values viz. multiple rows with same values in column 3, 4 and 5, which need to be considered as duplicates. For all such cases, the rows from second occurrence onwards should be modified in a way that their values in first two columns are replaced with values as in first occurrence.

I am attempting to do the following in a bash script and am wondering if it is possible:

Time the output of a command (in this case, mysql) using time Suppress the stdout output of the command Capture the stderr output of the command in case of an error Check the exit status code of the command after running it

This is a complex chain and I haven't had much luck getting it all to work together

Hello I have the following output from a simple debug jsp:

Weblogic Startup Since: Friday, October 19, 2012, 08:36:12 AM Database Current Time: Wednesday, December 12, 2012, 11:43:44 AM Weblogic JVM Current Time: Wednesday, December 12, 2012, 11:45:38 AM

Line 1 was a recorded variable during WebLogic webapp startup. Line 2 was output from database query select sysdate from dual; Line 3 was out

Hi, I am working with files containing 2 columns in which i need to come up with the frequency/count of values in col. 2 falling within specifics binned values of col. 1.