请教一下中断的操作问题....

只看该作者 · 2009-5-15 09:48

板子终于出来了，可在调试时始终不能进入中断，系统时钟的和外部中断都一样。先贴出系统时钟的配置代码，望大虾们给指点指点，谢谢！

只看该作者 · 2009-5-15 10:26

/* ##################################    SysTick function  ############################################ */
//========================位于core_cm3.h文件==================================

/* SysTick constants */
#define SYSTICK_ENABLE              0                                          /* Config-Bit to start or stop the SysTick Timer                         */
#define SYSTICK_TICKINT             1                                          /* Config-Bit to enable or disable the SysTick interrupt                 */
#define SYSTICK_CLKSOURCE           2                                          /* Clocksource has the offset 2 in SysTick Control and Status Register   */
#define SYSTICK_MAXCOUNT       ((1<<24) -1)                                    /* SysTick MaxCount                                                      */

/**
* @brief  Initialize and start the SysTick counter and its interrupt.
*
* @param  uint32_t ticks is the number of ticks between two interrupts
* @return  none
*
* Initialise the system tick timer and its interrupt and start the
* system tick timer / counter in free running mode to generate
* periodical interrupts.
*/
static __INLINE uint32_t SysTick_Config(uint32_t ticks)
{
  if (ticks > SYSTICK_MAXCOUNT)  return (1);                                                /* Reload value impossible */

  SysTick->LOAD  =  (ticks & SYSTICK_MAXCOUNT) - 1;                                         /* set reload register */
  NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);                               /* set Priority for Cortex-M0 System Interrupts */
  SysTick->VAL   =  (0x00);                                                                 /* Load the SysTick Counter Value */
  SysTick->CTRL = (1 << SYSTICK_CLKSOURCE) | (1<<SYSTICK_ENABLE) | (1<<SYSTICK_TICKINT);    /* Enable SysTick IRQ and SysTick Timer */
  return (0);                                                                               /* Function successful */
}

//================================================================================

#define SYSCLK_FREQ  72000000

int main(void)
{
  .......
  SysTick_Config(SYSCLK_FREQ/100); //10mS
  .......

while(1)
{
  .......
}

}


void SysTick_Handler(void)
{
.....
}

//===================================================================
//向量表文件
        ;; Forward declaration of sections.
        SECTION .intvec:CODE:NOROOT(2)

        EXTERN  __iar_program_start
        PUBLIC  __vector_table

        DATA
__intial_sp      EQU     0x2000fff0
__vector_table
        DCD     __intial_sp
        DCD     __iar_program_start

        DCD     NMI_Handler               ; NMI Handler
        DCD     HardFault_Handler         ; Hard Fault Handler
        DCD     MemManage_Handler         ; MPU Fault Handler
        DCD     BusFault_Handler          ; Bus Fault Handler
        DCD     UsageFault_Handler        ; Usage Fault Handler
        DCD     0                         ; Reserved
        DCD     0                         ; Reserved
        DCD     0                         ; Reserved
        DCD     0                         ; Reserved
        DCD     SVC_Handler               ; SVCall Handler
        DCD     DebugMon_Handler          ; Debug Monitor Handler
        DCD     0                         ; Reserved
        DCD     PendSV_Handler            ; PendSV Handler
        DCD     SysTick_Handler           ; SysTick Handler

       ............


        PUBWEAK SysTick_Handler
        SECTION .text:CODE:REORDER(1)
SysTick_Handler
        B SysTick_Handler        //systick_irq

        ...............

只看该作者 · 2009-5-15 16:09

调试时始终不能进入中断，SysTick 和外部中断都一样不能产生中断。

1万 · 2009-5-15 22:12

请参考一下STM32固件库中的例程吧。

只看该作者 · 2009-5-16 10:01

参照固件库例程，该设置的寄存器都设置了。

//各中断的优先级定义
#define Sys_TickPri           0
#define Exit8_IntPri          3 //power down
#define Spi1_Txd_IntPri       4 //驱动数据发送中断
#define Exit10_IntPri         5 //花型接收中断 u1_txd
#define U2_Rxd_Dma_Intpri     6 //QEI接收中断
#define Spi2_DmaTxd_IntPri    7 //通讯发送DMA中断

void Nvic_Init(void)
{
  NVIC_SetPriorityGrouping(NVIC_PriorityGroup_4);  //16级抢占优先级，1级子优先级。

  NVIC_SetPriority(EXTI9_5_IRQn,Exit8_IntPri);//
  NVIC_SetPriority(SPI1_IRQn, Spi1_Txd_IntPri);
  NVIC_SetPriority(EXTI15_10_IRQn, Exit10_IntPri);
  NVIC_SetPriority(USART2_IRQn, U2_Rxd_Dma_Intpri);
  NVIC_SetPriority(DMA1_Channel5_IRQn, Spi2_DmaTxd_IntPri);
  NVIC_SetPriority(CPU_INT_SYSTICK,Sys_TickPri);

  NVIC_ClearPendingIRQ(EXTI9_5_IRQn);
  NVIC_ClearPendingIRQ(SPI1_IRQn);
  NVIC_ClearPendingIRQ(EXTI15_10_IRQn);
  NVIC_ClearPendingIRQ(USART2_IRQn);
  NVIC_ClearPendingIRQ(DMA1_Channel5_IRQn);
  NVIC_ClearPendingIRQ(SPI3_IRQn);

  NVIC_EnableIRQ(EXTI9_5_IRQn );
  NVIC_EnableIRQ(SPI1_IRQn );
  NVIC_EnableIRQ(EXTI15_10_IRQn );
  NVIC_EnableIRQ(USART2_IRQn );
  NVIC_EnableIRQ(DMA1_Channel5_IRQn);
}