Key_EXTI_Config：神舟IV

GPIO 输入上拉，按键按下，pin接地，触发中断

Key_Config

 1 void Key_Config(void)
 2 {
 3   GPIO_InitTypeDef GPIO_InitStructure;
 4 
 5   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
 6 
 7   /* Configure KEY1 Button PC4*/
 8   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
 9 
10   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
11   GPIO_InitStructure.GPIO_Pin = GPIO_KEY1;
12   GPIO_Init(GPIOC, &GPIO_InitStructure);
13 
14   /* Configure KEY2 Button PB10*/
15   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
16 
17   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
18   GPIO_InitStructure.GPIO_Pin = GPIO_KEY2;
19   GPIO_Init(GPIOB, &GPIO_InitStructure);
20 
21   /* Configure KEY3 Button PC13*/
22   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
23 
24   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
25   GPIO_InitStructure.GPIO_Pin = GPIO_KEY3;
26   GPIO_Init(GPIOC, &GPIO_InitStructure);  
27 
28   /* Configure KEY4 Button PA0*/
29   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
30 
31   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
32   GPIO_InitStructure.GPIO_Pin = GPIO_KEY4;
33   GPIO_Init(GPIOA, &GPIO_InitStructure);   
34 }

KEY_EXIT_Init

 1 void KEY_EXIT_Init(void)
 2 {
 3     EXTI_InitTypeDef EXTI_InitStructure;
 4 
 5    
 6     /* Connect Button EXTI Line to Button GPIO Pin */
 7     GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource4);  
 8 
 9     /* Configure Button EXTI line */
10     EXTI_InitStructure.EXTI_Line = EXTI_Line4;
11     EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
12     EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  
13     EXTI_InitStructure.EXTI_LineCmd = ENABLE;
14     EXTI_Init(&EXTI_InitStructure);
15 
16 
17     /* Connect Button EXTI Line to Button GPIO Pin */
18     GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource10);  
19 
20     /* Configure Button EXTI line */
21     EXTI_InitStructure.EXTI_Line = EXTI_Line10;
22     EXTI_Init(&EXTI_InitStructure);
23 
24     
25     /* Connect Button EXTI Line to Button GPIO Pin */
26     GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);  
27 
28     /* Configure Button EXTI line */
29     EXTI_InitStructure.EXTI_Line = EXTI_Line13;
30     EXTI_Init(&EXTI_InitStructure);
31     
32     /* Connect Button EXTI Line to Button GPIO Pin */
33     GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);  
34 
35     /* Configure Button EXTI line */
36     EXTI_InitStructure.EXTI_Line = EXTI_Line0;
37     EXTI_Init(&EXTI_InitStructure);
38 }

Key_NVIC_Config

 1 void Key_NVIC_Config(void)
 2 { 
 3   NVIC_InitTypeDef NVIC_InitStructure;
 4   
 5   /* Set the Vector Table base address at 0x08000000 */
 6   NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0000);
 7 
 8   /* Configure the Priority Group to 2 bits */
 9   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
10 
11 
12   /* Enable the EXTI Interrupt */
13   NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
14   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
15   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
16   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
17   NVIC_Init(&NVIC_InitStructure);
18 
19   NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
20   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
21   NVIC_Init(&NVIC_InitStructure);
22 
23   NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
24   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
25   NVIC_Init(&NVIC_InitStructure);
26 
27   NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
28   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
29   NVIC_Init(&NVIC_InitStructure);
30 }