| 你最好确认一下    CPLD有没有给触发电平 例程参考修改一下你的中断初始化试试
 
 #include <csl.h>
 #include <csl_irq.h>
 
 #include <csl_pll.h>
 #include <csl_chip.h>
 #include <stdio.h>
 
 Uint16 old_intm;
 
 interrupt void EVT_INT3(void);
 interrupt void EVT_INT4(void);
 //---------Function prototypes---------
 
 /* Reference start of interrupt vector table   */
 
 /* This symbol is defined in file, vectors_IP.s55 */
 
 extern void VECSTART(void);
 
 
 /*锁相环的设置*/
 PLL_Config  myConfig      = {
 0,    //IAI
 1,    //IOB
 24,   //PLL
 1     //Divide by 2
 };
 
 
 void INTconfig()
 {
 /* Temporarily disable all maskable interrupts */
 
 IRQ_setVecs((Uint32)(&VECSTART));
 
 /* Temporarily disable all maskable interrupts */
 
 old_intm = IRQ_globalDisable();
 
 /* Clear any pending INT3&INT4 interrupts */
 
 IRQ_clear(IRQ_EVT_INT3);
 IRQ_clear(IRQ_EVT_INT4);
 /* Place interrupt service routine address at */
 
 /* associated vector location */
 
 IRQ_plug(IRQ_EVT_INT3,&EVT_INT3);
 IRQ_plug(IRQ_EVT_INT4,&EVT_INT4);
 /* Enable INT3&INT4 interrupt */
 
 IRQ_enable(IRQ_EVT_INT3);
 IRQ_enable(IRQ_EVT_INT4);
 /* Enable all maskable interrupts */
 
 IRQ_globalEnable();
 }
 
 void main(void)
 {
 /*初始化CSL库*/
 CSL_init();
 
 /*设置系统的运行速度为144MHz*/
 PLL_config(&myConfig);
 
 //设置并使能5509A芯片外部中断3和中断4
 INTconfig();
 
 while(1);
 }
 
 //External INT3(EXINT)中断处理函数
 interrupt void EVT_INT3()
 {
 printf("EXINT3 Ouccers!\n");
 }
 //External INT4(EXINT)中断处理函数
 interrupt void EVT_INT4()
 {
 printf("EXINT4 Ouccers!\n");
 }
 
 
 
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