Interrupt Problems

[ezrab]

Posted on October 12, 2010 at 17:08

hi

i have aquestion about Interrupts: in all the example code that i saw i could never find where the program goes to in case of an Interrupt. here is one of the exmple code i have from st site which the button activate external Interrupt but where does the program goes in that case?? /**   ******************************************************************************   * @file    EXTI/main.c   * @author  MCD Application Team   * @version V3.3.0   * @date    04/16/2010   * @brief   Main program body   ******************************************************************************   * @copy   *   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.   *   * <h2><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>   */ /* Includes ------------------------------------------------------------------*/ #include ''stm32f10x.h'' #include ''stm32_eval.h'' /** @addtogroup STM32F10x_StdPeriph_Examples   * @{   */ /** @addtogroup EXTI_Example   * @{   */ /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Private functions ---------------------------------------------------------*/ /**   * @brief  Main program.   * @param  None   * @retval None   */ int main(void) {   /*!< At this stage the microcontroller clock setting is already configured,        this is done through SystemInit() function which is called from startup        file (startup_stm32f10x_xx.s) before to branch to application main.        To reconfigure the default setting of SystemInit() function, refer to        system_stm32f10x.c file      */                /* Initialize LED1 and Key Button mounted on STM3210X-EVAL board */         STM_EVAL_LEDInit(LED1);   STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);    /* Generate software interrupt: simulate a falling edge applied on Key Button EXTI line */   EXTI_GenerateSWInterrupt(KEY_BUTTON_EXTI_LINE);           while (1)   {   } } #ifdef  USE_FULL_ASSERT /**   * @brief  Reports the name of the source file and the source line number   *         where the assert_param error has occurred.   * @param  file: pointer to the source file name   * @param  line: assert_param error line source number   * @retval None   */ 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 /**   * @}   */ /**   * @}   */ /******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/ thanks...

[Tesla DeLorean]

Posted on October 12, 2010 at 18:16

i have aquestion about Interrupts:

in all the example code that i saw i could never find where the program goes to in case of an Interrupt.

here is one of the exmple code i have from st site which the button activate external Interrupt but where does the program goes in that case?? Typically the interrupt routines are in the file stm32f10x_it.c within the project. /**   * @brief  This function handles External line0 interrupt request.   * @param  None   * @retval None   */ void EXTI0_IRQHandler(void) {   if(EXTI_GetITStatus(USER_BUTTON_EXTI_LINE) != RESET)   {     /* Toggle LED3 */      STM32vldiscovery_LEDToggle(LED3);     /* Clear the User Button EXTI line pending bit */     EXTI_ClearITPendingBit(USER_BUTTON_EXTI_LINE);   } }