Tips & Tricks

12 articles

Farewell to Del.icio.us

By Paul Parkinson I was disappointed to read in TechCrunch this morning that Yahoo has decided to shut down the Del.icio.us social bookmarking website (or should I say service?). I started using Delicious a few years ago after I had become fed up trying to organise my website bookmarks. I often want to bookmark A&D news stories, blog articles, technical…

Quit Bugging Me: Making Maps

By Mike Deliman A tool commonly used in embedded debugging is a linker map - a map of where all the symbols are in the runtime image.  These maps are useful as they turn raw addresses reported by some exception stubs (etc) into offsets into the data or text (program routines) in the computer's RAM.  They give you an idea…

Quit Bugging Me: Another Surprise NaN!

An Earlier QBM, "Surprise NAN" covered how floating point computations may become corrupted from unexpected sources.  Today's Quit Bugging Me is about... another Surprise! NAN!An application runs with several tasks.  One task, which computes a set of floating point values, periodically comes up with bad values, and sometimes the name becomes corrupted.  Here is a short example...  done with the…

Quit Bugging Me: Revalidated

By Mike Deliman One day, I get this phone call.  "We're working with the system, we see the calls that update the exception handlers early on - connecting the clock routines, etc.  Then not very much farther on we see the system has run past where tasking should be running but it's not.  When we check, we're not getting any…

Quit Bugging Me: Driving Me Backwards

By Mike Deliman You're working on a highly precise instrument.  The kind of instrument that relies on extremely accurate measurements of time.   Work is proceeding normally.  Suddenly.. events come in in a backwards order, time jumps around - but only for a few ticks.The heart of the system - in this case - is a hyper-accurate clock.  The clock's…

Quit Bugging Me: ABI

By Mike Deliman What's in an ABI?  An Application Binary Interface is a lot like a API - Applications Programming Interface, except instead of just telling you how to make a call, what parameters to provide, and what returns and errnos to expect, an ABI also tells you something about how the interfaces work.  Understanding an ABI for a CPU…

Quit Bugging Me: Induction

By Mike Deliman Working on a customer problem once, we had an interesting phenomena.  Upgrading a system with a large VME cage and several boards, the customer replaced older processor boards with what were then "new" boards.  The old boards ran at (I think) 33 MHz, the new ones at more like 133MHz. The overall system included motor control functions…

Serial Intent

By Mike Deliman Howdy out there,I realize this is a blog that's supposed to be about real-time programming issues, and mostly I've posted about planetary and space based projects, with a few announcements about technology and news items.  Though these combine subjects near and dear to my heart (space, and VxWorks), these were mostly "interest stories", not solid real-time issues. …

Rhapsody && Coverage Analysis

By Paul Parkinson I've recently been working with a customer to integrate Wind River Coverage Analysis (formerly known as CoverageScope) with Telelogic Rhapsody within their development tools framework for a mission-critical system. At first glance, it might seem strange to integrate a code coverage testing tool with a UML design tool, as these aren't even adjacent phases in the software…

scitopia supersearch

By Paul Parkinson Sometimes when I am writing technical papers and articles I want to check whether there are any recent scholarly articles on the topic. The easiest (or perhaps that should be laziest?) thing to do of course is to use Google web search, but this often returns an exhaustive list of results, it's often quite hard to find…