Lawnmower wrote:

> Anyone using the RTOS VDK on the Analog Devices SHARC/Blackfin?
> 
> Kevin
> 

Hi Kevin,

I'm currently implementing a prototype application using VDK.
Working on Sharc 21161.

The basic concepts are pretty, and its footprint is not too bad.
On the EZ-Kit board I found an overhead of some few microseconds per 
ISR (which occurs every 20us), depending on the application this 
might result in a performance penalty of 3...10%.

In my application I benefit of its architecture:
it is easy to document an implementation if it's based on concepts 
like device drivers, tasks, event flags and semaphores...

It's a little difficult to figure out the differences compared to 
the code examples which are provided with VisualDSP, because they 
will not apply any more, if you use VDK.
This is mainly, because interrupts and signals are used differently.
But once you get familiar with it, it can be managed.

Another issue is debugging:
The built-in instrumentation tools use lots of memory and time, 
therefore they are of help only in the beginning if you set up your 
architecture, but don't go into real-time world. Afterwards, you'll 
probably switch it off and don't use it anymore ...
Generally, debugging is slow: if a breakpoint is hit, I have to wait 
maybe 10..20 sec until the debugger gives me any hint that it's 
still alive. Nevertheless, it works fine.

As a summary:  Good concept, obviously it can be used for 
production, but only if the application is not too time-critical.
I would recommend it at least for the initial design/implementation 
phase of the project, even if you replace it later by self-written 
faster code.

Bernhard

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before sending to the above email-address:
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Anyone using the RTOS VDK on the Analog Devices SHARC/Blackfin?

A quick trawl of the newsgroup gave 5 posts from ages ago, but nothing
of interest.

We are considering using this RTOS on the next project, but have no
experience of it so comments would be appreciated!

Kevin


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