system tick timer - my program freezes

Posted on May 17, 2011 at 14:09

your function 

SysTick_Config () is not working properly

use this for sysTick initialization

int main(void)

{

  /* SysTick end of count event each 10ms with input clock equal to 9MHz (HCLK/8, default) */

  SysTick_SetReload(90000);

  /* Enable SysTick interrupt */

  SysTick_ITConfig(ENABLE);

  /* Enable the SysTick Counter */

  SysTick_CounterCmd(SysTick_Counter_Enable);

}

in stm32f10x_it.c

-----------------------------

void SysTick_Handler(void)

{

TIMERJOB=1;

}

regards.

Posted on May 17, 2011 at 14:09

hello thank you

which include file shall I include for the functions you mentioned ?

Posted on May 17, 2011 at 14:09

As kashif87 already said it must be your systick_config function that is wrong. But since you have not provided your function there is no way for us to help you. Please provide the source and I will try to help.

Trevor

Posted on May 17, 2011 at 14:09

the source code of systick_config is not written by me

it is a function from ST library

all I do is to call systick_config function to set the tick to 100 milisecond

and making a variable ''1'' in the systick_handler ISR

please look my first message

( kashif ' s code is giving error becouse his functions

not available in the ST library )

Posted on May 17, 2011 at 14:09

''can anybody comment why my first message example doesnot work ?''

Can you comment on what debugging you've done to determine where, exactly, your code is ''hanging''...?

Posted on May 17, 2011 at 14:09

They are functions from the V2.x library, the current one inlines Systick_Config()

But for goodness sake, how hard is it to code a simple Systick example, and post the complete source? The problem is probably in code you aren't showing, because this works just fine on the VL discovery board with Keil.

/******************************************************************************/

#include ''stm32F10x.h''

#include ''STM32vldiscovery.h''

/******************************************************************************/

volatile int TIMERJOB = 0; // needs to be volatile

void SysTick_Handler(void)

{

  TIMERJOB = 1;

}

/******************************************************************************/

int main(void)

{

  int led;

  /* Initialise LEDs LD3&LD4, both off */

  STM32vldiscovery_LEDInit(LED3);

  STM32vldiscovery_LEDInit(LED4);

  STM32vldiscovery_LEDOff(LED3);

  STM32vldiscovery_LEDOff(LED4);

  /* Setup SysTick Timer for 100 msec interrupts  */

  if (SysTick_Config(SystemCoreClock / 10))

  {

    /* Capture error */

    while (1);

  }

  TIMERJOB = 0;

  led = 0;

  /* main while */

  while(1)

  {

    if (TIMERJOB == 1)

    {

      TIMERJOB = 0;

      led ^= 1;

      if (led)

        STM32vldiscovery_LEDOff(LED3);

      else

        STM32vldiscovery_LEDOn(LED3);

    }

  }

  /* does not exit - kind of important */

}

/******************************************************************************/

#ifdef  USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)

{

  /* User can add his own implementation to report the file name and line number,

     ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */

  /* Infinite loop */

  while (1)

  {

  }

}

#endif

/******************************************************************************/