HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comment
Jon Titus
User Rank
Blogger
Re: Part IV: Fundamentals of Digital Debugging
Jon Titus   1/19/2012 3:05:57 PM
NO RATINGS
Q: When writing pure software often stubs are used to return values to emulate an external environment, moreso for a program that must interact externally. How do you simulate the effect of interaction before commiting to the actual external environment at the testing stage? ( bottom-up vs top-down approach).

 

A:  Years ago I had to build an instrument to acquire data from chemical instruments.  I used a large EPROM to store a simulated waveform and then fed it to a DAC with an R/C filter to simulate the signal.  That gave me a "standard" to use for testing.  As an alternate, I could have saved this data in memory and written a routine to obtain it form that memory instead of using an ADC to digitize the DAC's output.  But, in those days, memory was expensive and processors couldn't address more than 64 Kbytes.  Is that what you're getting at?






Partner Zone
Latest Analysis
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Software developers beware: Your open-source components may not be secure.
For companies that have gone into corporate venturing, sponsoring and nurturing startup companies, the subsequent IP transfer is tricky.
Learn how to build Raspberry Pi controllers using Python during this free Continuing Education Center class presented by Design News and Digi-Key.
Earlier this year paralyzed IndyCar drive Sam Schmidt did the seemingly impossible -- opening the qualifying rounds at Indy by driving a modified Corvette C7 Stingray around the Indianapolis Motor Speedway.
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Jul 6 - 10, Building Raspberry Pi Controllers with Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service