Re: silly ravenscar question

[jan.de.kruyf@gmail.com]

On Saturday, February 28, 2015 at 11:57:14 AM UTC+2, Simon Wright wrote:

> I now need to get back and review the differences between the AdaCore
> version and mine (for example, I have Duration_32_Bits True; I think
> that at that moment I was stuck on Time_Span being 32 bits .. but now I
> have it at 64 bits ..)

32 bits? that wont do. for time synching you need 64 bits. . . 

In any case I thought lemme quickly (note the word 'quickly') port the little rs232 terminal program that I did, to zfp. So I want to use the system time-tick timer (for measuring), so it is in the board support packages, so I plant what I need in some subdirectory and start dropping what I dont need and compiling and catching bugs. A great learning experience. 

So now I have a question you might have seen the answer to, on one of your travels:

Where exactly does the system drop from supervisor mode into user mode?
and also where is the silly routine to go back into supervisor mode?
I thought I combed the ravenscar init section through properly but no luck.
I know the theory about it. But it would be great to see an example.

And I did not spot any system setup in the zfp collection! (That is the worst).


May Oberon live forever (I even wrote a single pass compiler for a mini version long ago, for some other embedded project).

cheers,

j.


> 
> > Thanks a lot for your help.
> 
> Glad to be able to.