stm32在ucos-II下外部中断无法实现

可mcu 提问时间：2012-3-2 19:15 /

我想用stm32在ucos-II系统下实现外部中断，ucos-ii移植没问题。但是无法初始化nvic,只要加入NVIC初始化结体的代码系统就无法工作，注释掉后系统又能正常工作了。
main.c

#include "ucos_ii.h"
#include "stm32f10x.h"
#include "led.h"
static OS_STK startup_task_stk[STARTUP_TASK_STK_SIZE];
static OS_STK task1_stk[TASK1_STK_SIZE];

static void systick_init(void)
{
RCC_ClocksTypeDef rcc_clocks;
RCC_GetClocksFreq(&rcc_clocks);
SysTick_Config(rcc_clocks.HCLK_Frequency / OS_TICKS_PER_SEC);
}

static void task1(void *p_arg)
{
NVIC_init();
for (;;)
{
   GPIO_SetBits(GPIOE, GPIO_Pin_5);
   OSTimeDly(500);
   GPIO_ResetBits(GPIOE, GPIO_Pin_5);
   OSTimeDly(500);
}
}

static void startup_task(void *p_arg)
{
INT8U err;
systick_init(); /* Initialize the SysTick. */
#if (OS_TASK_STAT_EN > 0)
OSStatInit(); /* Determine CPU capacity. */
#endif
/* TODO: create application tasks here */

err = OSTaskCreate(task1, (void *)0,
     &task1_stk[TASK1_STK_SIZE-1], TASK1_PRIO);

if (OS_ERR_NONE != err)
while(1);
OSTaskDel(OS_PRIO_SELF);
}
int main(void)
{
PPP_init();
OSInit();
OSTaskCreate(startup_task, (void *)0,
     &startup_task_stk[STARTUP_TASK_STK_SIZE - 1],
     STARTUP_TASK_PRIO);
OSStart();
return 0;
}
其中GPIO_init()用于初始化GPIO和端口时钟，NVIC_init()用于初始化NVIC和EXTI。
GPIO_init()
void PPP_init(void)
{
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOE, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}

NVIC_init()
void NVIC_init(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);

EXTI_ClearITPendingBit(EXTI_Line0);
EXTI_InitStructure.EXTI_Line=EXTI_Line0;
EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd=ENABLE;
EXTI_Init(&EXTI_InitStructure);
EXTI_GenerateSWInterrupt(EXTI_Line0);
}

如果注释掉
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Init(&NVIC_InitStructure);
两行代码中的任意一行系统可以正常运行，也就是task1中的灯可以闪烁，如果没有注释掉，体统不能工作灯不闪

有哪位大虾可以为小弟提供正确的代码例程，我将感激不尽,终身难忘！~ QQ 417748195 邮箱：mkkj@live.cn