进入中断后，立刻读取IO电平，如果为高电平，则为上升沿触发，反之亦然。

貌似没有那么麻烦，给你一个我之前写的按键中断你看看。

BF518上的。

#include <cdefBF518.h>
#include <sys\exception.h>
#include <ccblkfn.h>
#include <stdio.h>

#define pDEVICE_OE (volatile unsigned short *)0x20320000
#define pLED_DAT (volatile unsigned short *)0x20340000

#define IOSCLK  PH4
#define IOMISO  PH5
#define IOCS  PH6

EX_INTERRUPT_HANDLER(Pushbutton_ISR);

void Set_PLL(unsigned int pmsel,unsigned int pssel)
{
unsigned int new_PLL_CTL;
*pPLL_DIV = pssel;
asm("ssync;");
new_PLL_CTL = (pmsel & 0x3f) << 9;  
*pSIC_IWR |= 0xffffffff;
if (new_PLL_CTL != *pPLL_CTL)
{
  *pPLL_CTL = new_PLL_CTL;
  asm("ssync;");
  asm("idle;");
}
}

void Init_EBIU(void)
{
*pEBIU_AMBCTL0 = 0x7bb07bb0;
*pEBIU_AMBCTL1 = 0xffc07bb0;
*pEBIU_AMGCTL = 0x000f;
}

void Init_SDRAM(void)
{
*pEBIU_SDRRC = 0x00000817;
*pEBIU_SDBCTL = 0x00000013;
*pEBIU_SDGCTL = 0x0091998d;
ssync();
}

delay(int count)
{
int i;
for(i=0;i<count;i++);
}

init_port()
{
int iar5 = *pSIC_IAR5;
int imask1 = *pSIC_IMASK0;

*pPORTG_FER   &= (~(PG6 | PG7 | PG8| PG9)); //PH4  时钟  PH5  数据  PH6 片选
*pPORTGIO_DIR  &= (~(PG6 | PG7 | PG8| PG9));
*pPORTGIO_INEN  |= PG6 | PG7 | PG8| PG9;



*pPORTGIO_EDGE |= PG6 | PG7 | PG8| PG9;;  /* edge sensitive */
*pPORTGIO_POLAR &= (~(PG6 | PG7 | PG8| PG9)); /* rising edge */
    *pPORTGIO_MASKA_SET |= PG6 | PG7 | PG8| PG9;/* enable pbs */

    /* port H interrupt A is bits 20-23 of IAR3, setup for IVG11 */
    iar5 |= 0x00000004;
iar5 &= 0xfffffff4;
    *pSIC_IAR5 = iar5;

    /* register ISR and enable port H interrupt A */
    register_handler(ik_ivg11, Pushbutton_ISR);
    imask1 = *pSIC_IMASK1;
    imask1 |= 0x00000100;
    *pSIC_IMASK1 = imask1;

}

EX_INTERRUPT_HANDLER(Pushbutton_ISR)
{
int pb_status = *pPORTGIO;

/* if PB1 pushed */
if ( 0x0040 == (pb_status & PG6) )
{
  *pPORTGIO_CLEAR = PG6;
  printf("PB is PG6!\n");
}
  if ( 0x0080 == (pb_status & PG7) )
{
  *pPORTGIO_CLEAR = PG7;
  printf("PB is PG7!\n");
}

  if ( 0x0100 == (pb_status & PG8) )
{
  *pPORTGIO_CLEAR = PG8;
  printf("PB is PG8!\n");
}

  if ( 0x0200 == (pb_status & PG9) )
{
  *pPORTGIO_CLEAR = PG9;
  printf("PB is PG9!\n");
}

}

/****************************************************************************
* 名称 ： main
* 功能 ： LED测试主函数
* 入口参数 ：无
* 出口参数 ：无
****************************************************************************/

void main(void)
{
unsigned short data;

  Set_PLL(16,4);
    Init_EBIU();
    Init_SDRAM();
    init_port();
    while(1);  

}

好，有空的话我试试