STM32F4學習筆記之EXTI中斷(使用固件庫)

1、1.使能SYSSCFG和對應GPIO時鐘 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOx, ENABLE);2.配置對應GPIO為輸入模式 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x; GPIO_Init(GPIOx,&am

2、p;GPIO_InitStructure);3.配置對應GPIO為EXIT線 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOx, EXTI_PinSourcex); 4.配置EXIT的工作參數 EXTI_InitStructure.EXTI_Line = EXTI_Linex; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;/中斷，EXTI_Mode_Event為事件 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;/下降沿，EXTI_Tri

3、gger_Rising為上升沿，EXTI_Trigger_Rising_Falling雙跳邊沿 EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure);5.配置NVIC中的EXTI中斷線 NVIC_InitStructure.NVIC_IRQChannel = EXTIx_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = xx； NVIC_InitStructure.NVIC_IRQChannelSubPriority = x

4、x; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); 程序舉例：int main(void) GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_AHB1PeriphClockCmd(RCC_A

5、HB1Periph_GPIOC, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOF, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 ; /led GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitSt

6、ructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOF, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_5; GPIO_Init(GPIOA,&am

7、p;GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; GPIO_Init(GPIOC,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOF,&GPIO_InitStructure); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0); EXTI_InitStructure.EXTI_Line = EXTI_Line0; EX

8、TI_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 = EXTI0_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;/優(yōu)先級最低

9、NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource5); EXTI_InitStructure.EXTI_Line = EXTI_Line5; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_

10、InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;/優(yōu)先級最低 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;

11、 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOF, EXTI_PinSource11); EXTI_InitStructure.EXTI_Line = EXTI_Line11; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

12、EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;/優(yōu)先級最低 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

13、NVIC_Init(&NVIC_InitStructure); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13); EXTI_InitStructure.EXTI_Line = EXTI_Line13; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_In

14、it(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;/優(yōu)先級最低 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); GPIO_SetBits(

15、GPIOF, GPIO_Pin_7 | GPIO_Pin_9); GPIO_SetBits(GPIOF, GPIO_Pin_8 | GPIO_Pin_10); while (1) void EXTI0_IRQHandler(void) if(EXTI_GetITStatus(EXTI_Line0) != RESET) /* Toggle LED1 */ GPIO_ResetBits(GPIOF, GPIO_Pin_8); /* Clear the EXTI line 0 pending bit */ EXTI_ClearITPendingBit(EXTI_Line0); void EXTI9_

16、5_IRQHandler(void) if(EXTI_GetITStatus(EXTI_Line5) != RESET) /* Toggle LED1 */ GPIO_SetBits(GPIOF, GPIO_Pin_8); /* Clear the EXTI line 0 pending bit */ EXTI_ClearITPendingBit(EXTI_Line5); void EXTI15_10_IRQHandler(void) if(EXTI_GetITStatus(EXTI_Line11) != RESET) /* Toggle LED2 */ GPIO_ResetBits(GPIOF, GPIO_Pin_7);