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
For decades there have been rumors that Microsoft essentially copied DRI's CP/M operating system and sold it to IBM as MS-DOS. In just a few days, all will be revealed.
A San Francisco startup called Otto came out of stealth mode recently and released a dramatic video demonstrating its successful test of a technology for self-driving trucks.
Researchers have found a way to use graphene to cheaply and easily turn dirty water into drinking water.
A new 1-GHz vector signal transceiver promises to offer expanded test capabilities for engineers involved in applications ranging from automotive and aerospace to semiconductors and defense.
Researchers at the Masdar Institute of Science and Technology have devised a new method for designing strong, light cellular structures of re-architected metals and plastics with optimized properties.
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.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9 | 10


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

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service