F4中断为什么进不去呢

只看该作者 · 2014-7-31 19:33

中断配置代码如下:

void bsp_InitKeyEXTI(void)

{

EXTI_InitTypeDef EXTI_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

/* 使能SYSCFG时钟 */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

/* 连接 EXTI Line8 到 PI8 引脚 */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOI, EXTI_PinSource8);

/* 连接 EXTI Line13 到 PC13 引脚 */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13);

/* 连接 EXTI Line11 到 PI11 引脚 */

  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOI, EXTI_PinSource11);

/* 连接 EXTI Line3 到 PH3 引脚 */

  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOH, EXTI_PinSource3);

/* 连接 EXTI Line15 到 PH15 引脚 */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOH, EXTI_PinSource15);

/* 连接 EXTI Line7 到 PG7 引脚 */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOG, EXTI_PinSource7);

/* 连接 EXTI Line2 到 PH2 引脚 */

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOH, EXTI_PinSource2);

/* 连接 EXTI Line11 到 PF11 引脚 */

// SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource11);

/* 配置 EXTI LineXXX */

EXTI_InitStructure.EXTI_Line = EXTI_Line2 | EXTI_Line3 | EXTI_Line7 | EXTI_Line8 \

                              | EXTI_Line11 | EXTI_Line13| EXTI_Line15;

//EXTI_InitStructure.EXTI_Line = EXTI_Line13 | EXTI_Line11 |  EXTI_Line8 | EXTI_Line7 ;

///////////////////////////////////////////////////////////////////////////////

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

/* 设置NVIC优先级分组为Group2：0-3抢占式优先级，0-3的响应式优先级 */

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

/* 中断优先级配置最低优先级这里一定要分开的设置中断，不能够合并到一个里面设置 */

NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x02;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x03;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x03;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

}

当 EXTI15_10_IRQn和EXTI9_5_IRQn的抢占优先级设置为一样，即0x02或者0x03时都能进入。但是一个设置为0x02一个设置为0x03时，设置为0x03那个的中断函数就是进不去,到底是什么情况呢？