[STM32F4] 软件中断问题，附stm32f4 的IAR工程

static void  systick_init(void)

{

    RCC_ClocksTypeDef   rcc_clocks;

        uint32_t    cnts;



    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);

    

        RCC_GetClocksFreq(&rcc_clocks);



        cnts = (uint32_t)rcc_clocks.HCLK_Frequency / 25600;



    if ((cnts - 1UL) > SysTick_LOAD_RELOAD_Msk) { while(1); }   /* Reload value impossible */



    SysTick->LOAD  = (uint32_t)(cnts - 1UL);                    /* set reload register */

    NVIC_SetPriority (SysTick_IRQn, 0);                         /* set Priority highest */

    SysTick->VAL   = 0;                                         /* Load the SysTick Counter Value */

    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |

                     SysTick_CTRL_TICKINT_Msk   |

                     SysTick_CTRL_ENABLE_Msk;                    /* Enable SysTick IRQ and SysTick Timer */

        

}







static void EXTILine0_Config(void)

{

    EXTI_InitTypeDef   EXTI_InitStructure;

    NVIC_InitTypeDef   NVIC_InitStructure;



    /* Enable SYSCFG clock */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);



    /* Configure EXTI Line0 */

    EXTI_InitStructure.EXTI_Line = EXTI_Line0;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

    EXTI_Init(&EXTI_InitStructure);



    /* Enable and set EXTI Line0 Interrupt to the lowest priority */

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x1;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStructure);

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Configures EXTI Line15 (connected to PG15 pin) in interrupt mode

  * @param  None

  * @retval None

  */

static void EXTILine13_15_Config(void)

{

    EXTI_InitTypeDef   EXTI_InitStructure;

    NVIC_InitTypeDef   NVIC_InitStructure;



    /* Enable SYSCFG clock */

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  

    /* Configure EXTI Line13 */

    EXTI_InitStructure.EXTI_Line = EXTI_Line13;

    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

    EXTI_InitStructure.EXTI_LineCmd = ENABLE;

    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

    EXTI_Init(&EXTI_InitStructure);

  

    /* Enable and set EXTI15_10 Interrupt to the lowest priority */

    NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;

    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;

    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;

    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;



    NVIC_Init(&NVIC_InitStructure);

}



static void exti_init(void)

{

    EXTILine0_Config();

    

    EXTILine13_15_Config();   

}





void period_init(void)

{

    /* Configures the priority grouping: pre-emption priority and subpriority */

    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

    

    /* Sample periodic interrupt config */

    systick_init();

    

    

    /* Externel interrupt init */

    exti_init();

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Main program

  * @param  None

  * @retval None

  */

int main(void)

{    

    /* Timer, cycle sampling init */

    period_init();

    

    /* Infinite loop */

    while (1)

    {        



    }

}





int32_t short_interrupt_trig_cnt = 0;

int32_t short_interrupt_cnt= 0;

int32_t long_interrupt_trig_cnt = 0;

int32_t long_interrupt_cnt= 0;



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Period sampling handler，512 pionts every cycle.

  * @param  None

  * @retval None

  */



void SysTick_Handler(void)

{

    static uint16_t counter = 0;

        

    counter++;

    

    /* 256 points，half cycle */ 

    if ((counter&0x00FF) == 0x00FF)

    {

        /* Generate software interrupt */

        EXTI_GenerateSWInterrupt(EXTI_Line0);

        short_interrupt_trig_cnt++;

    }  

    

    /* 5120 points，ten cycles */

    if (counter >= 5119)

    {

        counter = 0;

        /* Generate software interrupt */

        EXTI_GenerateSWInterrupt(EXTI_Line13);

        long_interrupt_trig_cnt++;

    }

    

}





/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  This function handles External line 0 interrupt request.

  * @param  None

  * @retval None

  */

void EXTI0_IRQHandler(void)

{

    if(EXTI_GetITStatus(EXTI_Line0) != RESET)

    {

        /* Clear the EXTI line 0 pending bit */

        EXTI_ClearITPendingBit(EXTI_Line0);

        

        short_interrupt_cnt++;

    }

}



/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  This function handles External lines 15 to 10 interrupt request.

  * @param  None

  * @retval None

  */

void EXTI15_10_IRQHandler(void)

{  

    if(EXTI_GetITStatus(EXTI_Line13) != RESET)

    {  

        /* Clear the EXTI line 13 pending bit */

        EXTI_ClearITPendingBit(EXTI_Line13);

        //delay(0x1);    

        long_interrupt_cnt++;

    }

}