按鍵中斷程序

1、夫1個(gè)LED指示燈，對(duì)應(yīng)的GPIO為:PC0輸出為1點(diǎn)亮LED輸出為0關(guān)閉LED另外PC1為外部中斷觸發(fā)：按鍵按下時(shí)為低電平，即可設(shè)置為低電平觸發(fā)/* GPIO配置函數(shù)夫/void GPIO_Configuration(void)/*定義2個(gè)結(jié)構(gòu)體變量夫/GPIO_InitTypeDef GPIO_InitStructure;/夫開(kāi)啟GPIOB，GPIOC，復(fù)用口時(shí)鐘的時(shí)鐘夫/RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);RCC_A

2、PB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);/夫給GPIOC_Pin_1 一個(gè)初始值夫/GPIO_ResetBits(GPIOC, GPIO_Pin_0);配置IO 口，初始化IOGPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;/將連接LED的GPIO設(shè)置為推挽輸出GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;/設(shè)置為2MHZ的速度，響應(yīng)時(shí)間，沒(méi)要求越小越好GPIO_Mode_IPU為輸出GPIO_InitStructure.GPIO_Speed = GPI

3、O_Speed_2MHz;/初始化GPIOCGPIO_Init(GPIOC, &GPIO_InitStructure);/夫給 KEY_InitStructure.GPIO_Pin KEY_InitStructure.GPIO_ModeKEY_InitStructure.GPIO_Speed 付初始值夫/GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;/設(shè)置為上拉輸入GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU ;/設(shè)置為2MHZ的速度GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2M

4、Hz;/初始化GPIOBGPIO_Init(GPIOC, &GPIO_InitStructure);/設(shè)置GPIOC的中斷標(biāo)志位GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource1);夫夫夫夫夫夫配置extI*void EXTI_Configuration(void) /定義一個(gè)結(jié)構(gòu)體EXTI_InitTypeDef EXTI_InitStructure;/設(shè)置中段線EXTIInitStructure.EXTILine = EXTILine1;/使能中斷線EXTIInitStructure.EXTILineCmd = ENABLE

5、;/設(shè)置中斷模式EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;/設(shè)置中斷觸發(fā)方式EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Falling;/初始化中斷EXTI_Init(&EXTI_InitStructure);*配置優(yōu)先級(jí)*void NVIC_Configuration(void) /定義一個(gè)結(jié)構(gòu)體NVIC_InitTypeDef NVIC_InitStructure;/設(shè)置優(yōu)先級(jí)組NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0) ;/設(shè)置存入

6、寄存器NVIC_SetVectorTable (NVIC_VectTab_FLASH ,0 x0);/設(shè)置 外部中斷1線這里對(duì)應(yīng)的是外部中斷1因?yàn)槲疫x的是之前的PC1來(lái)觸發(fā)另外EXTI5_9_IRQn則表示外部中斷5-9線。NVIC_InitStructure.NVIC_IRQChannel =EXTI1_IRQn;/使能優(yōu)先級(jí)NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;/配置搶斷優(yōu)先級(jí)這個(gè)是決定中斷跳轉(zhuǎn)可否嵌套的依據(jù)夫夫夫非常重要NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority =0;/

7、配置響應(yīng)優(yōu)先級(jí)NVIC_InitStructure.NVIC_IRQChannelSubPriority =0;/初始化優(yōu)先級(jí)NVIC_Init(&NVIC_InitStructure);/主函數(shù)int main(void)/*/調(diào)用初始化GPIO函數(shù)GPIO_Configuration ();EXTI_Configuration ();NVIC_Configuration ();while(1);在it.c中的程序：void EXTI1_IRQHandler(void)(delay_GSM(10000);if( EXTI_GetITStatus (EXTI_Line1) = 1 )(EXTI_ClearITPendingBit (EXTI_Line1);send_gprs_da