Problems with TimingDelay_Decrement

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Florian Augustin

• August 08, 2012 19:26

Dear ARM-Experts,

 

i'm programming with the STM32F4Discovery and now i'm setting up my Crossworks workspace.

Everything's fine except this two errors:

THUMB Debug/stm32f4xx_it.o: In function `SysTick_Handler':

 undefined reference to `TimingDelay_Decrement'

 

I used the std_piriph_lib. there is in the main.h:

/* Exported functions ------------------------------------------------------- */
void TimingDelay_Decrement(void);
void Delay(__IO uint32_t nTime);

 

But only sollution i can solve this error is copy this to main.c or somewhere:

 static volatile uint32_t TimingDelay;

 

 

void Delay(uint32_t nTime){

 

  TimingDelay = nTime;

  while(TimingDelay != 0);

}

 

void TimingDelay_Decrement(void)

{

  if (TimingDelay != 0x00)

  {

    TimingDelay--;

  }

}

I found this on http://www.kutayzorlu.com/electric-electronic/microprocessors/stm-stm32/fixing-undefined-reference-to-timingdelay_decrementstm32l1xx_it-ccc-problem.html

What did i do wrong?

And another short question:

The header files are included by project preprocessor settings.

But i had to add the c include file to the project to get it working. Otherwise he didn't find them. How can i solve this more elegant?

Thank you so much for help!

Greetings from Germany!

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• 

  Florian Augustin

  • August 09, 2012 13:09

  Second Problem is solved! Now the h-files are only listed under the main.c when i click on the plus-figure..

  But the Timing Delay thing still is a big problem... :(

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• 

  Paul Curtis

  • August 09, 2012 13:36

  You should go an ask ST what they're doing.  The fix you show above looks like it should work and takes the form of other main files implemented by the MCD team.

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  frank meyer

  • August 18, 2012 17:44

  This TimingDelay_Decrement() function is part of the SysTick example from ST, and can be found in the example subfolder of the peripheral libs. That function is called from within the SysTick interrupt. The handler routine usually resides in stm32fxxx_it.c.

  If you declare the TimingDelay variable static, as given in your post:

   static volatile uint32_t TimingDelay;

  you need to have this TimingDelay_Decrement() function in the same module, as it accesses it. This could be main.c, as it is also in the SysTick example.

  I suggest to check this example project, as the purpose of this functions is somewhat explained there.

  Nothing special otherwise, just a plain linker and visibility issue.

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  Florian Augustin

  • August 24, 2012 11:55

  Thank you, Frank!

  I thought i'm very clever and deleted all the stuff from the main that i don't need. But i fogot to delete the function inside the systick interrupt service routine :D

   

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