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Good day!
I have a problem with using RTX166 Tiny OS with EC++. If I try to define tasks in .cpp file, I dont see JUMP to _main() function.
In technical support: "RTX166 TINY: CAN'T DEFINE TASKS IN EC++" http://www.keil.com/support/docs/2812.htm advises to "Simply define your _task_ and interrupt functions in a .C file". In this case Can I use C++ features (ex. define objects) in tasks functions?
In file C:\Program Files\Keil\C166\Rtx_Tiny\readme5.txt I have read following note:
Function os_start for EC++ compatiblity ======================================= The function os_start enables the usage of RTX166 Tiny together with EC++. EC++ requires special initalizations that are performed in the main routine. After this initalizations, the os_start function can be called to start the RTX166 Tiny kernel. EXTERN_C void _main () { init_mempool (mempool, sizeof (mempool)); // create memory pool for new & delete __sti__init__ (); // call initializer functions os_start (); // start RTX166 kernel }
But senselessly try to call os_start(), if _main() is not called.
P.S. Problem "expected {" I resolve using replace _task_ with __task. Is it correct?
Stephane,
You said:
"Therefore you should put os_init() in your main() function, not in _main()"
but where is the main() function situated?
There is no main function in OS projects, only tasks!
Now, I've placed _main() CALL explicitly in task 0. But I'm sure that it is not correct way, isn't it?
the problem remains.
Oleg,
Ignore my previous post, as it is confusing.
Short answer: define a main() anyway, and see what happens.
Long answer:
There is an example in Keil\C166\Rtx_Tiny which is supposed to show how to use EC++ and RTX Tiny. It doesn't work on my machine! _main() is never called, I believe there is a problem with this example.
It seems that RTX Tiny defines a symbol called main, which in turn calls os_start() (look at the source code for RTX Tiny)
One workaround is to define, and it can by anywhere in your cpp code really:
int main() {}
This symbol will override the one in RTX Tiny's library, which means that this function will be called, rather than the one inside the real time library. Then, the EC++ parser will recognize this special function and call _main() automatically, as soon as main() is executed (look at how main() is modified inside the .ic. file)
Other workaround: modify the .a66 initialization file so it calls _main instead of main. Look for the lines of code that say:
... EXTRN main:Model ... $IF TINY JMP main $ELSE JMP FAR main $ENDIF
and replace all main with _main.
Not sure if this makes sense, but I hope this helps...
-Stéphane
Take a look here: C:\Keil\C166\Examples\EC++\RtxTiny This example shows you how to create an RtxTiny Application with EC++.
Reinhard
Hello Reinhard,
This example seems to be broken (at least for me), that's the problem.
_main() is never called, which is an issue because then EC++ classes are not initialized, neither is the memory pool...
This example is so simple (no constructors, not even a single data member) that it appears to be working, whereas in fact the EC++ initialization is not done at all.
-Stephane