EXTI外部中断触发：神舟IV

先设置两个中断输入口 PA6/PA7 浮空输入 PA6下降沿，PA7上升沿

EXTI_Config

 1 void EXTI_Config(void)
 2 {
 3     GPIO_InitTypeDef GPIO_InitStructure;
 4     EXTI_InitTypeDef EXTI_InitStructure;
 5     NVIC_InitTypeDef NVIC_InitStructure;
 6     
 7     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
 8     
 9     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
10     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
11     GPIO_Init(GPIOA, &GPIO_InitStructure);
12     GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource6);
13     GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource7);
14 
15     // Configure EXTI Line6 to generate an interrupt on falling edge 
16     EXTI_InitStructure.EXTI_Line = EXTI_Line6;
17     EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
18     EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
19     EXTI_InitStructure.EXTI_LineCmd = ENABLE;
20     EXTI_Init(&EXTI_InitStructure);
21 
22     EXTI_InitStructure.EXTI_Line = EXTI_Line7;
23     EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
24     EXTI_Init(&EXTI_InitStructure);
25 
26     /* Enable the EXTI15_10 Interrupt */
27     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
28     NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //EXTI15_10_IRQChannel;
29     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
30     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
31     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
32     NVIC_Init(&NVIC_InitStructure);                                         
33 }

设置两个pin PB0/PB1（推挽输出）为中断输入PA6/PA7提供中断源

EXTI_Input_Config

 1 void EXTI_Input_Config(void)
 2 {
 3     /* Config PB0 for PA6 and PB1 for PA7 */
 4    GPIO_InitTypeDef GPIO_InitStructure;
 5    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE);  //RCC_APB2Periph_AFIO
 6   
 7    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;   
 8    /* 推挽输出 */
 9    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
10    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
11    GPIO_Init(GPIOB, &GPIO_InitStructure);
12 
13 }

按键4按下后检测PB0状态，然后位取反，分别接入PA6，PA7，串口显示OK

EXTI0_IRQHandler

 1 void EXTI0_IRQHandler(void)
 2 {
 3   u8 i;
 4   /* Key4 */
 5   if(EXTI_GetITStatus(EXTI_Line0) != RESET)
 6   {
 7     Led_Turn_off_all();
 8     Led_Turn_on_4();
 9 
10     printf("\n\r Key 4 interrupt \n\r");
11     if(GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_0)) 
12     {
13      printf("\n\r PB0 Set \n\r"); 
14      GPIO_ResetBits(GPIOB, GPIO_Pin_0);
15      for(i=0;i<100;i++);
16     }
17     else
18     {
19      printf("\n\r PB0 Reset \n\r");
20      GPIO_SetBits(GPIOB, GPIO_Pin_0);
21      for(i=0;i<100;i++);
22     }
23 
24     if(GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_0)) 
25     {
26      printf("\n\r PB0 Set \n\r"); 
27     }
28     else
29     {
30      printf("\n\r PB0 Reset \n\r");
31     }
32 
33     /* Clear the EXTI Line 0 */
34     EXTI_ClearITPendingBit(EXTI_Line0);
35   }
36 }

PA6/7触发后中断处理函数

EXTI9_5_IRQHandler

 1 void EXTI9_5_IRQHandler(void)
 2 {
 3   if(EXTI_GetITStatus(EXTI_Line6) != RESET)
 4   {
 5     printf("\n\r PA_6 interrupt \n\r");
 6     
 7     /* Clear the EXTI Line 6 */
 8     EXTI_ClearITPendingBit(EXTI_Line6);
 9   }
10   if(EXTI_GetITStatus(EXTI_Line7) != RESET)
11   {
12     printf("\n\r PA_7 interrupt \n\r");
13     
14     /* Clear the EXTI Line 7 */
15     EXTI_ClearITPendingBit(EXTI_Line7);
16   }
17   
18 }