实验结果：按左键led灯向左亮，按右键led灯向右亮
void __irq int_int(void); //声明中断服务函数 int flag=0; //定义一个标志位 void led_Y(void) //小灯自左向右依次亮灭 { int i,nOut; nOut = 0xF0; rCPLDLEDADDR = nOut | 0x0F; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x07; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x03; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x01; for(i = 0; i < 100000; i++); nOut = 0xFF; rCPLDLEDADDR = nOut & 0xF0; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xF8; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xFC; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xFE; for(i = 0; i < 100000; i++); } void led_Z(void) //小灯自右向左依次亮灭 { int i,nOut; nOut = 0xFF; rCPLDLEDADDR = nOut & 0xFE; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xFC; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xF8; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut & 0xF0; for(i = 0; i < 100000; i++); nOut = 0xF0; rCPLDLEDADDR = nOut | 0x01; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x03; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x07; for(i = 0; i < 100000; i++); rCPLDLEDADDR = nOut | 0x0F; for(i = 0; i < 100000; i++); } void led_m(void) { int i; rCPLDLEDADDR = 0xFF; for(i = 0; i < 100000; i++); } 中断程序 void __irq int_int(void) { unsigned char Status; Status = rCPLDIntStatus; //中断状态是低有效 Status = ~(Status & 0x6); //将状态取反 if(Status & 0x2) //查询键和控制处理 { flag=0; uart_printf(" Eint0 interrupt occurred.\n"); rCPLDIntControl |= (1<<1); rCPLDIntControl &= ~(1<<1); } else if(Status & 0x4) { flag=1; uart_printf(" EINT1 interrupt occurred.\n"); rCPLDIntControl |= (1<<2); rCPLDIntControl &= ~(1<<2); } rEINTPEND=(1<<9); //禁止外部中断EINT8 ClearPending(BIT_EINT8_23); } 按键初始化 void int_init(void) { rSRCPND = rSRCPND; // Clear all interrupt rINTPND = rINTPND; // Clear all interrupt // nIntMode='3'; rGPGCON |= (0xf<<0); rGPGCON &= (0xa<<0); rCPLDIntControl = 0xFF; //控制寄存器 中断允许控制 rCPLDIntControl = 0xF9; pISR_EINT8_23=(UINT32T)int_int; //中断服务地址填到中断向量表 rEINTPEND = 0xffffff; //外部中断请求设置全1 rSRCPND = BIT_EINT8_23; // Clear the previous pending states rINTPND = BIT_EINT8_23; //记录CPU正在处理的中断源 rEXTINT1 &= ~((0x7<<4)|(0x7<<0)); //电平 控制EINT8为下降沿触发 rEXTINT1 |= ((0x2<<4)|(0x2<<0)); rEINTMASK &= ~(3<<8); //外部中断屏蔽寄存器，允许EINT8,9 rINTMSK &= ~(BIT_EINT8_23); } 主程序 void int_test(void) { uart_printf("\n External Interrupt Test Example\n"); int_init(); while(1) //等待中断，循环 { if(flag==0) //标志位为0，灯向左亮；为1，灯向右亮 led_Z(); else led_Y(); } }