Hello,

I have a question of the significance of a #if vs. #ifdef in *pxPortInitialiseStack() in port.c -

The first statement with TIVFPSUPPORT has an #if - the second has an #ifdef - is this done on purpose to get a certain behavior out of the preprocessor or is that just a typo?

For instance, if I did #define TIVFPSUPPORT 0 then that may end up with a behavior I don't want; or is that done on purpose?

I searched the project and I don't find any #define TIVFPSUPPORT anywhere and I haven't located anything (yet) in the project settings.

Thanks, John W.

Both are wrong according to the coding standard really - only #if( test == condition ) should be used. Other than that there is no real significance in the two you highlight. I think portPRELOADTASKREGISTERS is not a constant provided to the user, and is just their to assist development, so it is not necessarily defined anywhere, hence it uses a #ifdef.

You are better off copying the Cortex-A port rather than that port though.

Regards.

For the Cortex R4F? I will take look at the Cortex-A port.

Thanks, John

Yes - the new Cortex-R port (not yet published) is basically the same as the A port.

Regards.

Hmmm, do you mind telling me specifically under which tool set?
The Atmel Cortex-A5 IAR port looks close.

Also - What kindof shape is the code in HALCoGEN? I tried to put a couple of ports together with that with limited success.

Thanks, John

Does your R4 device use a standard ARM GIC (Generic Interrupt Controller)? If so then look at a Cortex-A9 port (there is one for GCC, IAR and ARM compilers if I recall correctly). If your R4 device does not use a GIC then look at the Atmel Cortex-A5 port as that is more generic (uses callbacks into the application for interrupt controller handling, rather than assuming a GIC is available).

Regards.

It's an R4F using a VIC - Vectored Interrupt Controller.

The port I have is 'working' as long as the tasks are all the same priority (IDLE task is starving) and I don't have the FPU working correctly yet with the flop test/task.