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一个中断源 对应多个中断接口EXTI9_5_IRQHandler()中识别不同的口 ...
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KEY的中断方式 : 一个中断源，对应多个中断接口EXTI_Line 如何区别不同的中断line？
GPIO配置为up形式，使用falling方式触发中断可以，如果使用nopull方式，使用falling或者是rising有干扰信号。
测试：
PB5\6\7 中断EXTI9_5_IRQHandler()
单独PB5、6、7中断都可以进入
如果是5、6组合，不能进中断；
57或是67组合，只有7可以进中断；
567组合时，只有7可以进中断。
找到原因是：SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource5|EXTI_PinSource6|EXTI_PinSource7);不能够或的方式，必须分开初始化
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource5);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource6);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource7);
void Key_InterruptMode_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOs clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB, ENABLE);
//init GPIOA.13 ÉÏÀÊäÈë Key_1
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Connect Button EXTI Line to GPIO Pin 15
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource15);
EXTI_InitStructure.EXTI_Line = EXTI_Line15 ;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// exti9_5 pb5 pb6 pb7
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource5);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource6);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource7);
EXTI_InitStructure.EXTI_Line = EXTI_Line5|EXTI_Line6|EXTI_Line7;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI9_5_IRQHandler(void)
{
#ifdef KEY_INTERRUPT
uint8_t data;
if(EXTI_GetITStatus(EXTI_Line5) != RESET) // key2
{
BOARD_LED_OFF(LED1);
BOARD_LED_OFF(LED3);
data='2';
usart1_sendbyte(&data,1);
EXTI_ClearITPendingBit(EXTI_Line5); // Clear the EXTI line 5 pending bit
}
if(EXTI_GetITStatus(EXTI_Line6) != RESET) // key3
{
BOARD_LED_ON(LED1);
BOARD_LED_OFF(LED3);
data='3';
usart1_sendbyte(&data,1);
EXTI_ClearITPendingBit(EXTI_Line6); // Clear the EXTI line 5 pending bit
}
if(EXTI_GetITStatus(EXTI_Line7) != RESET) // key4
{
BOARD_LED_OFF(LED1);
BOARD_LED_ON(LED3);
data='4';
usart1_sendbyte(&data,1);
EXTI_ClearITPendingBit(EXTI_Line7); // Clear the EXTI line 5 pending bit
}
#endif
}
一个是获取状态的，一个是获取中断的。
EXTI_GetFlagStatus只是纯粹读取中断标志位的状态，但是不一定会响应中断（EXT_IMR寄存器对该中断进行屏蔽）；而EXTI_GetITStatus除了读取中断标志位，还查看EXT_IMR寄存器是否对该中断进行屏蔽，在中断挂起&没有屏蔽的情况下就会响应中断。仔细看看代码就知道区别了
FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
{
FlagStatus bitstatus = RESET;
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
{
ITStatus bitstatus = RESET;
uint32_t enablestatus = 0;
assert_param(IS_GET_EXTI_LINE(EXTI_Line));
enablestatus = EXTI->IMR & EXTI_Line;
if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
{
bitstatus = SET;
}
else
{
bitstatus = RESET;
}
return bitstatus;
}
