用万利的板子学M3，环境是MDK3.24，用NVIC,EXIT做两个按键分别控制两个LED的实验:KEY2控制LD1亮灭，KEY3控制LD3亮灭 一开始开了level 3的优化，结果只有KEY2控制LD1亮灭可以起作用，KEY3不起作用。 调了半天没有发现问题在哪里，两个按键，两个LED的设置是一模一样的。后来把优化给关了，就都正常了 哪位高手可以解释下吗？ 程序中没有使用自己定义的变量 工程在这里： http://www.ourdev.cn/bbs/bbs_upload540590/files_11/ourdev_503054.rar EXTI的配置 void EXTI_Configuration(void) {            EXTI_InitTypeDef EXTI_InitStructure;   /* Connect (Key Button EXTI Line to Key Button) GPIO Pin */      GPIO_EXTILineConfig(GPIO_PortSourceGPIOD, GPIO_PinSource3);   /* Configure Key Button EXTI Line to generate an interrupt on falling edge*/       EXTI_InitStructure.EXTI_Line = EXTI_Line3;   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;   EXTI_InitStructure.EXTI_LineCmd = ENABLE;   EXTI_Init(&EXTI_InitStructure);   /* Connect (Key Button EXTI Line to Key Button) GPIO Pin */   GPIO_EXTILineConfig(GPIO_PortSourceGPIOD, GPIO_PinSource4);                                                                                                                                               /* Configure Key Button EXTI Line to generate an interrupt on falling edge */      EXTI_InitStructure.EXTI_Line = EXTI_Line4;   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;   EXTI_InitStructure.EXTI_LineCmd = ENABLE;   EXTI_Init(&EXTI_InitStructure); } NVIC的配置 void NVIC_Configuration(void) {   NVIC_InitTypeDef NVIC_InitStructure;     #ifdef  VECT_TAB_RAM      /* Set the Vector Table base location at 0x20000000 */     NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);   #else  /* VECT_TAB_FLASH  */   /* Set the Vector Table base location at 0x08000000 */     NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);     #endif   /* Configure one bit for preemption priority */   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);       /* Enable the EXTI3 Interrupt*/     NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQChannel;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   NVIC_Init(&NVIC_InitStructure);                                                                  /* Enable the EXTI4 Interrupt */   NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQChannel;   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;   NVIC_Init(&NVIC_InitStructure);             } GPIO的配置 void GPIO_Configuration(void) {   GPIO_InitTypeDef GPIO_InitStructure;   /* Configure （PC.04 -- PC.11） as （Output push-pull） */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 |GPIO_Pin_6 | GPIO_Pin_7;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_Init(GPIOC, &GPIO_InitStructure);   /* Configure （PD.03, PC.04, PC.11 -- PC.15 as input floating） */   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_11 | GPIO_Pin_12 |       GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;   GPIO_Init(GPIOD, &GPIO_InitStructure); } 下面是两个中断处理 void EXTI3_IRQHandler(void) {                                                        GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)((1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7))));     /* Clear the Key Button EXTI line pending bit */     EXTI_ClearITPendingBit(EXTI_Line3); } void EXTI4_IRQHandler(void) {     GPIO_WriteBit(GPIOC, GPIO_Pin_5, (BitAction)((1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_5))));     /* Clear the Key Button EXTI line pending bit */     EXTI_ClearITPendingBit(EXTI_Line4); }