Example timer

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This is a guide to the timer C example project included in the EMAC OE SDK.

This project demonstrates how to use the software timer.

The timer project builds one executable: timer.

Opening, Building and Uploading the Project Files

For information on opening the project from within Eclipse, please see Importing the EMAC OE SDK Projects with Eclipse. Then, follow Using the EMAC OE SDK Projects with Eclipse for information on how to build, upload and execute the example.

Alternatively, the Makefile can be used with the make command from the commandline to build and upload the example. For information on this method, please see Using EMAC OE SDK Example Projects.

EMAC SDK 5.X

For information on opening the project from within QtCreator, please see QtCreator: Adding Source Files. Then, follow Getting Started With Qt Creator for information on how to build, upload and execute the example.

Alternatively, the CMakefile.txt can be used with the cmake command from the commandline to build and upload the example. For information on this method, please see Getting Started with the EMAC OE SDK.

Usage and Behavior

Hardware Requirements

The timer C example project will run just fine on any system for which it can be compiled.

Using timer

The timer program is executed from the console. It takes a single parameter.

./timer frequency

Where frequency specifies the frequency of the timer's tick cycle.
It reports the delay between ticks, running until it is manually halted with a CTRL-C.

Usage Example

root@som9g20:/tmp# ./timer 1     
Starting timer at 1 HZ
delay : 1002  ms 
delay : 1000  ms 
delay : 1000  ms 
.
.
.
delay : 1000  ms 
delay : 1000  ms 
^C

Specifying 1 as our tick freqency, the timer cycles at a sedate 1000 ms (1 s) until we hit CTRL-C.

Summary

The timer C example project demonstrates how to use the software timer.