Problems using C++ with Eclipse

[James]

Hi,

I have been able to use the C standalone examples with Eclipse and get
things going.

However, when I switch to C++ I just cannot get it to work with
objects. I can build it using C++ , but as soon as I try to
instantiate an Object or declare a virtual function it just won't
build.

I assume I am missing some linking parameter or something. Has anyone
used C++ to program the virtual cog? What I am really after is a
makefile that is setup for C++ and ideally eclipse.

[Dan Foisy]

Hello James,

C++ requires a more involved startup file than regular old C, as well as
a number of other functions (e.g. dynamic memory allocation to support
new). I have never seen a standalone package of functionality to
support C++ on ARM. If you wish to use C++, I would recommend using Linux.

Dan

--
Daniel Foisy
Virtual Cogs Embedded Systems Inc.
Unit 4, 5694 Highway 7 East, Suite 311
Markham, Ontario, Canada L3P 1B4
www.virtualcogs.com
416-238-2231

"Your future is modular"

[James]

Hmm.. Ok.

I have a C++ library I need to bind to the camera output, so it seems
I either have write some linux device drivers so I can use C++ or port
the needed parts of the C++ library to C and work in standalone mode.
Now, I have no idea how hard or easy to create linux device drivers
but since they don't exist yet I expect it is on the harder side. I
have seen mention of a memory mapped camera device driver in this list
but no code is available.

So i suppose I need to create linux drivers for
- I2C access - To be able to drive the camera registers
- Camera module - To capture the image via DMA
- UART - In linux mode can I access the UART using /dev/ttyS0 or
similar as is?

Any feel for how long it takes to write device drivers like these for
a good C programmer but with no linux device driver experience. I am
after some sort of ball park estimate for writing the linux device
drivers timewise to choose between C++/linux & C/Standalone?

Regards,
James

> "Your future is modular"- Hide quoted text -
>
> - Show quoted text -

[Dan Foisy]

James,

Yes, you can access the uart as /dev/ttyS0. Assuming you don't need to
share the I2C resources with another task, it wouldn't take too long to
write that driver (or to use the existing GPIO driver) - essentially,
you can take the GPIO driver code and modify that appropriately, say
under a week or so. I've got an i.MX31 V4L driver for the camera that
works but am not sure how much effort it would be to port to the i.MX21.

Dan