单片机实验二NVIC中断实验.docx

实验二NVIC中断实验 班级: 计科0902 学号: 09281047姓名: 万晓松一、 实验目的1、 STM32 中断的基本概念以及嵌套向量中断控制器(NVIC)。2、 了解中断的优先处理权。3、 读懂所给C语言控制中断代码，学会应用STM32的库函数二、 实验内容1、 理解中断概念，通过实验现象理解代码及函数调用。三、 实验代码及解释EXITMain.c*/void GPIO_Configuration(void) GPIO_InitTypeDef GPIO_InitStructure; /* Configure PC.06 as Output push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; /初始化GPIO_Pin_6，速度为50MHz，为输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Configure PB.09 as input floating (EXTI Line 9) */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; /初始化GPIO_Pin_9，为中断线9，为输入 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure);/*/* Function Name : NVIC_Configuration* Description : Configure the nested vectored interrupt controller.* Input : None* Output : None* Return : None*/void NVIC_Configuration(void) NVIC_InitTypeDef NVIC_InitStructure; #ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); #else /* VECT_TAB_FLASH */ /* Set the Vector Table base location at 0x08000000 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif /* Configure one bit for preemption priority */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); /* Enable the EXTI9_5 Interrupt */* 配置外部中断 EXTI9_5 */ NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;/抢占优先级为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /响应优先级位0，优先级最高，最先处理 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);It.c*/void EXTI9_5_IRQHandler(void)if(EXTI_GetITStatus(EXTI_Line9) != RESET)/key键控制EXTI_Line9，当他的状态未准备好去，按了一下key /* Toggle PC6 pin */ GPIO_WriteBit(GPIOC, GPIO_Pin_6, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_6);/把取到的状态 取反再写回显示 /* Clear the EXTI line 9 pending bit */ EXTI_ClearITPendingBit(EXTI_Line9); /注意EXTI_Line9-5清位 /*NVICMain.c/* Includes -*/#include stm32f10x_lib.h/* Private typedef -*/* Private define -*/* Private macro -*/* Private variables -*/NVIC_InitTypeDef NVIC_InitStructure;GPIO_InitTypeDef GPIO_InitStructure;EXTI_InitTypeDef EXTI_InitStructure;bool PreemptionOccured = FALSE; /记录按系统时钟中断初始为FALSEu8 PreemptionPriorityValue = 0; /记录初始的优先级状态ErrorStatus HSEStartUpStatus; /* Private function prototypes -*/void RCC_Configuration(void);void GPIO_Configuration(void);void EXTI_Configuration(void);void Delay(vu32 nCount); /* Private functions -*/* Function Name : main* Description : Main program.* Input : None* Output : None* Return : None*/int main(void)#ifdef DEBUG debug();#endif /* Configure the system clocks */ RCC_Configuration(); /* Configure GPIOs */ GPIO_Configuration(); /* Configures the EXTI Lines */ EXTI_Configuration(); #ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); #else /* VECT_TAB_FLASH */ /* Set the Vector Table base location at 0x08000000 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif /* Configure one bit for preemption priority */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);/NVIC_PriorityGroupConfig() 选择使选择第1组优先级分组方式 /* Enable the EXTI0 Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PreemptionPriorityValue;/EXTI0 初始抢占优先及为0，响应优先级为0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* Enable the EXTI9_5 Interrupt */ NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;/EXTI9_5 初始抢占优先及为0，响应优先级为1，低于EXTI0 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* Configure the SysTick Handler Priority: Preemption priority and subpriority */ NVIC_SystemHandlerPriorityConfig(SystemHandler_SysTick, !PreemptionPriorityValue, 0); /SysTick初始抢占优先及为0，响应优先级为0，默认情况下系统时钟优先级最高 while (1) if(PreemptionOccured != FALSE) /系统时钟是否被打断，只有系统时钟优先级低于外部时钟优先级，所以按key可执行中断（it.c），降低系统优先级 /系统时钟被打断，按wakeup则启动外部中断，执行以下程序 GPIO_WriteBit(GPIOC, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_6); /取GPIO_Pin_6当前状态再取反写回 Delay(0x5FFFF); GPIO_WriteBit(GPIOC, GPIO_Pin_7, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_7); Delay(0x5FFFF); GPIO_WriteBit(GPIOC, GPIO_Pin_8, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_8); Delay(0x5FFFF); GPIO_WriteBit(GPIOC, GPIO_Pin_9, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOC, GPIO_Pin_9); Delay(0x5FFFF); /* Function Name : RCC_Configuration* Description : Configures the different system clocks* Input : None* Output : None* Return : None*/void RCC_Configuration(void) /* RCC system reset(for debug purpose) */ RCC_DeInit(); /* Enable HSE */ RCC_HSEConfig(RCC_HSE_ON); /* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus = SUCCESS) /* Enable Prefetch Buffer */ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); /* Flash 2 wait state */ FLASH_SetLatency(FLASH_Latency_2); /* HCLK = SYSCLK */ RCC_HCLKConfig(RCC_SYSCLK_Div1); /* PCLK2 = HCLK */ RCC_PCLK2Config(RCC_HCLK_Div1); /* PCLK1 = HCLK/2 */ RCC_PCLK1Config(RCC_HCLK_Div2); /* PLLCLK = 8MHz * 9 = 72 MHz */ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); /* Enable PLL */ RCC_PLLCmd(ENABLE); /* Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) = RESET) /* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08) /* Enable GPIOA, GPIOB, GPIOC and AFIO Clocks */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);/* Function Name : GPIO_Configuration* Description : Configures the used GPIO pins.* Input : None* Output : None* Return : None*/void GPIO_Configuration(void) /* Configure PC.06, PC.07, PC.08 and PC.09 as output push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9; /定义GPIO灯6-9 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Configure PA.00 as input floating */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Configure PB.09 as input floating */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure);it.c*/void EXTI9_5_IRQHandler(void) NVIC_InitTypeDef NVIC_InitStructure; if(EXTI_GetITStatus(EXTI_Line9) != RESET) PreemptionPriorityValue = !PreemptionPriorityValue; PreemptionOccured = FALSE; /* Modify the EXTI0 Interrupt Preemption Priority */ NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel; NVIC_InitStructure.NVIC_I