历史上的今天
今天是：2024年12月28日（星期六）
2018年12月28日 | STM32外部中断方式按键操作(STM32_09)
2018-12-28 来源：eefocus
一、中断配置的步骤
1、使能中断
2、设置中断优先级分组
void NVIC_PriorityGroupConfig(uint32_tNVIC_PriorityGroup);
#define NVIC_PriorityGroup_0 ((uint32_t)0x700) /*0位抢占，4位响应 */
#define NVIC_PriorityGroup_1 ((uint32_t)0x600) /*1位抢占，3位响应 */
#define NVIC_PriorityGroup_2 ((uint32_t)0x500) /*2位抢占，2位响应 */
#define NVIC_PriorityGroup_3 ((uint32_t)0x400) /*3位抢占，1位响应 */
#define NVIC_PriorityGroup_4 ((uint32_t)0x300) /*4位抢占，0位响应 */
一般选择NVIC_PriorityGroup_2，即抢占和响应均有4级。
3、配置NVIC_InitTypeDef结构体
void NVIC_Init(NVIC_InitTypeDef*NVIC_InitStruct);
typedef struct
{
uint8_t NVIC_IRQChannel; /*指定要使能或要失能的IRQ通道，这个值可以从stm32f10x.h中引用*/
uint8_t NVIC_IRQChannelPreemptionPriority; /*指定抢占优先级，0-15 */
uint8_t NVIC_IRQChannelSubPriority; /*指定响应优先级，0-15 */
FunctionalState NVIC_IRQChannelCmd; /*使能或失能 ENABLE / DISABLE */
} NVIC_InitTypeDef;
NVIC_IRQChannelPreemptionPriority和NVIC_IRQChannelSubPriority的取值范围与调用中断优先级分组函数NVIC_PriorityGroupConfig时的配置相关，如果分组选择的是NVIC_PriorityGroup_2，则这两个的取值均为0-3。
stm32f10x.h中定义的中断通道值(HD)：
typedef enum IRQn
{
/****** Cortex-M3 Processor Exceptions Numbers ************/
NonMaskableInt_IRQn = -14, /*!< 2 Non Maskable Interrupt */
MemoryManagement_IRQn = -12, /*!< 4 Cortex-M3 Memory Management Interrupt */
BusFault_IRQn = -11, /*!< 5 Cortex-M3 Bus Fault Interrupt */
UsageFault_IRQn = -10, /*!< 6 Cortex-M3 Usage Fault Interrupt */
SVCall_IRQn = -5, /*!< 11 Cortex-M3 SV Call Interrupt */
DebugMonitor_IRQn = -4, /*!< 12 Cortex-M3 Debug Monitor Interrupt */
PendSV_IRQn = -2, /*!< 14 Cortex-M3 Pend SV Interrupt */
SysTick_IRQn = -1, /*!< 15 Cortex-M3 System Tick Interrupt */
/****** STM32 specific Interrupt Numbers ***********************************/
WWDG_IRQn = 0, /*!< Window WatchDog Interrupt */
PVD_IRQn = 1, /*!< PVD through EXTI Line detection Interrupt */
TAMPER_IRQn = 2, /*!< Tamper Interrupt */
RTC_IRQn = 3, /*!< RTC global Interrupt */
FLASH_IRQn = 4, /*!< FLASH global Interrupt */
RCC_IRQn = 5, /*!< RCC global Interrupt */
EXTI0_IRQn = 6, /*!< EXTI Line0 Interrupt */
EXTI1_IRQn = 7, /*!< EXTI Line1 Interrupt */
EXTI2_IRQn = 8, /*!< EXTI Line2 Interrupt */
EXTI3_IRQn = 9, /*!< EXTI Line3 Interrupt */
EXTI4_IRQn = 10, /*!< EXTI Line4 Interrupt */
DMA1_Channel1_IRQn = 11, /*!< DMA1 Channel 1 global Interrupt */
DMA1_Channel2_IRQn = 12, /*!< DMA1 Channel 2 global Interrupt */
DMA1_Channel3_IRQn = 13, /*!< DMA1 Channel 3 global Interrupt */
DMA1_Channel4_IRQn = 14, /*!< DMA1 Channel 4 global Interrupt */
DMA1_Channel5_IRQn = 15, /*!< DMA1 Channel 5 global Interrupt */
DMA1_Channel6_IRQn = 16, /*!< DMA1 Channel 6 global Interrupt */
DMA1_Channel7_IRQn = 17, /*!< DMA1 Channel 7 global Interrupt */
#ifdef STM32F10X_HD
ADC1_2_IRQn = 18, /* ADC1 and ADC2 global Interrupt */
USB_HP_CAN1_TX_IRQn = 19, /* USB Device High Priority or CAN1 TX Interrupts */
USB_LP_CAN1_RX0_IRQn = 20, /* USB Device Low Priority or CAN1 RX0 Interrupts */
CAN1_RX1_IRQn = 21, /* CAN1 RX1 Interrupt */
CAN1_SCE_IRQn = 22,/* CAN1 SCE Interrupt */
EXTI9_5_IRQn = 23, /* External Line[9:5] Interrupts */
TIM1_BRK_IRQn = 24, /* TIM1 Break Interrupt */
TIM1_UP_IRQn = 25, /* TIM1 Update Interrupt */
TIM1_TRG_COM_IRQn = 26, /* TIM1 Trigger and Commutation Interrupt */
TIM1_CC_IRQn = 27, /* TIM1 Capture Compare Interrupt */
TIM2_IRQn = 28, /* TIM2 global Interrupt */
TIM3_IRQn = 29, /* TIM3 global Interrupt */
TIM4_IRQn = 30, /* TIM4 global Interrupt */
I2C1_EV_IRQn = 31, /* I2C1 Event Interrupt */
I2C1_ER_IRQn = 32, /* I2C1 Error Interrupt */
I2C2_EV_IRQn = 33, /* I2C2 Event Interrupt */
I2C2_ER_IRQn = 34, /* I2C2 Error Interrupt */
SPI1_IRQn = 35, /* SPI1 global Interrupt */
SPI2_IRQn = 36, /* SPI2 global Interrupt */
USART1_IRQn = 37, /* USART1 global Interrupt */
USART2_IRQn = 38, /* USART2 global Interrupt */
USART3_IRQn = 39, /* USART3 global Interrupt */
EXTI15_10_IRQn = 40, /* External Line[15:10] Interrupts */
RTCAlarm_IRQn = 41, /* RTC Alarm through EXTI Line Interrupt */
USBWakeUp_IRQn = 42, /* USB Device WakeUp from suspend through EXTI Line Interrupt */
TIM8_BRK_IRQn = 43, /* TIM8 Break Interrupt */
TIM8_UP_IRQn = 44, /* TIM8 Update Interrupt */
TIM8_TRG_COM_IRQn = 45, /* TIM8 Trigger and Commutation Interrupt */
TIM8_CC_IRQn = 46, /* TIM8 Capture Compare Interrupt */
ADC3_IRQn = 47, /* ADC3 global Interrupt */
FSMC_IRQn = 48, /* FSMC global Interrupt */
SDIO_IRQn = 49, /* SDIO global Interrupt */
TIM5_IRQn = 50, /* TIM5 global Interrupt */
SPI3_IRQn = 51, /* SPI3 global Interrupt */
UART4_IRQn = 52, /* UART4 global Interrupt */
UART5_IRQn = 53, /* UART5 global Interrupt */
TIM6_IRQn = 54, /* TIM6 global Interrupt */
TIM7_IRQn = 55, /* TIM7 global Interrupt */
DMA2_Channel1_IRQn = 56, /* DMA2 Channel 1 global Interrupt */
DMA2_Channel2_IRQn = 57, /* DMA2 Channel 2 global Interrupt */
DMA2_Channel3_IRQn = 58, /* DMA2 Channel 3 global Interrupt */
DMA2_Channel4_5_IRQn = 59 /* DMA2 Channel 4 and Channel 5 global Interrupt */
} IRQn_Type;
4、编写中断服务函数
中断服务函数有固定的函数名，在startup_stm32f10x_hd.s文件中已经定义：
__Vectors DCD __initial_sp ; Top of Stack
DCD Reset_Handler ; Reset Handler
DCD NMI_Handler ; NMI Handler
DCD HardFault_Handler ; Hard Fault Handler
DCD MemManage_Handler ; MPU Fault Handler
DCD BusFault_Handler ; Bus Fault Handler
DCD UsageFault_Handler ; Usage Fault Handler
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD 0 ; Reserved
DCD SVC_Handler ; SVCall Handler
DCD DebugMon_Handler ; Debug Monitor Handler
DCD 0 ; Reserved
DCD PendSV_Handler ; PendSV Handler
DCD SysTick_Handler ; SysTick Handler
; External Interrupts
DCD WWDG_IRQHandler ; Window Watchdog
DCD PVD_IRQHandler ; PVD through EXTI Line detect
DCD TAMPER_IRQHandler ; Tamper
DCD RTC_IRQHandler ; RTC
DCD FLASH_IRQHandler ; Flash
DCD RCC_IRQHandler ; RCC
DCD EXTI0_IRQHandler ; EXTI Line 0
DCD EXTI1_IRQHandler ; EXTI Line 1
DCD EXTI2_IRQHandler ; EXTI Line 2
DCD EXTI3_IRQHandler ; EXTI Line 3
DCD EXTI4_IRQHandler ; EXTI Line 4
DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 1
DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2
DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3
DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4
DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5
DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6
DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7
DCD ADC1_2_IRQHandler ; ADC1 & ADC2
DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX
DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0
DCD CAN1_RX1_IRQHandler ; CAN1 RX1
DCD CAN1_SCE_IRQHandler ; CAN1 SCE
DCD EXTI9_5_IRQHandler ; EXTI Line 9..5
DCD TIM1_BRK_IRQHandler ; TIM1 Break
DCD TIM1_UP_IRQHandler ; TIM1 Update
DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation
DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare
DCD TIM2_IRQHandler ; TIM2
DCD TIM3_IRQHandler ; TIM3
DCD TIM4_IRQHandler ; TIM4
DCD I2C1_EV_IRQHandler ; I2C1 Event
DCD I2C1_ER_IRQHandler ; I2C1 Error
DCD I2C2_EV_IRQHandler ; I2C2 Event
DCD I2C2_ER_IRQHandler ; I2C2 Error
DCD SPI1_IRQHandler ; SPI1
DCD SPI2_IRQHandler ; SPI2
DCD USART1_IRQHandler ; USART1
DCD USART2_IRQHandler ; USART2
DCD USART3_IRQHandler ; USART3
DCD EXTI15_10_IRQHandler ; EXTI Line 15..10
DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line
DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend
DCD TIM8_BRK_IRQHandler ; TIM8 Break
DCD TIM8_UP_IRQHandler ; TIM8 Update
DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation
DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare
DCD ADC3_IRQHandler ; ADC3
DCD FSMC_IRQHandler ; FSMC
DCD SDIO_IRQHandler ; SDIO
DCD TIM5_IRQHandler ; TIM5
DCD SPI3_IRQHandler ; SPI3
DCD UART4_IRQHandler ; UART4
DCD UART5_IRQHandler ; UART5
DCD TIM6_IRQHandler ; TIM6
DCD TIM7_IRQHandler ; TIM7
DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1
DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2
DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3
DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5
__Vectors_End
二、外部中断/事件控制器EXTI
互联网型产品有20个EXTI，其他的有19个，与IO口引脚相连的有16个(EXTI0-EXTI15)，还有PVD(EXTI线16)，RTCAlarm(EXTI线17)，USB唤醒(EXTI线18)，以及互联网型的ETH_WKUP(EXTI线19)。EXTI0~EXTI15可以被映射到GPIOA-GPIOG的引脚上。
EXTI结构框图
三、外部中断配置
配置外部中断使用STM32外设库函数，涉及"stm32f10x_exti.h"、"stm32f10x_exti.c"、"stm32f10x_gpio.h"和"stm32f10x_gpio.c"四个文件。
在本程序中将开发板上的四个按键均配置为外部中断源，分别是GPIOA_0对应EXTI_Line0，GPIOE_2、GPIOE_3、和GPIOE_4分别对应EXTI_2、EXTI_3和EXTI_4。
1、使能IO口时钟，配置IO口为输入模式
2、开启AFIO时钟
RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO, ENABLE );
3、设置IO口与中断线的映射关系
使用GPIO_EXTILineConfig函数("stm32f10x_gpio.h"和"stm32f10x_gpio.c")该函数原型为：void GPIO_EXTILineConfig( uint8_t GPIO_PortSource, uint8_t GPIO_PinSource);
其中GPIO_PortSource取值如下：
#define GPIO_PortSourceGPIOA ((uint8_t)0x00)
#define GPIO_PortSourceGPIOB ((uint8_t)0x01)
#define GPIO_PortSourceGPIOC ((uint8_t)0x02)
#define GPIO_PortSourceGPIOD ((uint8_t)0x03)
#define GPIO_PortSourceGPIOE ((uint8_t)0x04)
#define GPIO_PortSourceGPIOF ((uint8_t)0x05)
#define GPIO_PortSourceGPIOG ((uint8_t)0x06)
GPIO_PinSource取值如下：
#define GPIO_PinSource0 ((uint8_t)0x00)
#define GPIO_PinSource1 ((uint8_t)0x01)
#define GPIO_PinSource2 ((uint8_t)0x02)
#define GPIO_PinSource3 ((uint8_t)0x03)
#define GPIO_PinSource4 ((uint8_t)0x04)
#define GPIO_PinSource5 ((uint8_t)0x05)
#define GPIO_PinSource6 ((uint8_t)0x06)
#define GPIO_PinSource7 ((uint8_t)0x07)
#define GPIO_PinSource8 ((uint8_t)0x08)
#define GPIO_PinSource9 ((uint8_t)0x09)
#define GPIO_PinSource10 ((uint8_t)0x0A)
#define GPIO_PinSource11 ((uint8_t)0x0B)
#define GPIO_PinSource12 ((uint8_t)0x0C)
#define GPIO_PinSource13 ((uint8_t)0x0D)
#define GPIO_PinSource14 ((uint8_t)0x0E)
#define GPIO_PinSource15 ((uint8_t)0x0F)
这里四个按键对应中断线映射：
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource2 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4 );
4、配置中断分组(NVIC)，使能中断
voidNVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup);
voidNVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct);
这里如下调用：
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//对GPIO_0，映射到EXTI0
NVIC_InitTypeDef NVIC_Struct;
NVIC_Stuct.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_Stuct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_Stuct.NVIC_IRQChannelSubPriority = 3;
NVIC_Stuct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_Struct );
5、初始化EXTI，选择触发方式
调用EXTI库函数EXTI_Init实现，该函数原型为：
voidEXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
在"stm32f10x_exti.h"文件中定义了以下结构体和宏：
typedef struct
{
uint32_t EXTI_Line; /*指定要使能或失能的中断或事件线*/
EXTIMode_TypeDef EXTI_Mode; /*指定中断线的模式*/
EXTITrigger_TypeDef EXTI_Trigger; /*设置触发方式*/
FunctionalState EXTI_LineCmd; /*使能或失能 ENABLE or DISABLE */
}EXTI_InitTypeDef;
#define EXTI_Line0 ((uint32_t)0x00001) /* External interrupt line 0 */
#define EXTI_Line1 ((uint32_t)0x00002) /* External interrupt line 1 */
#define EXTI_Line2 ((uint32_t)0x00004) /* External interrupt line 2 */
#define EXTI_Line3 ((uint32_t)0x00008) /* External interrupt line 3 */
#define EXTI_Line4 ((uint32_t)0x00010) /* External interrupt line 4 */
#define EXTI_Line5 ((uint32_t)0x00020) /* External interrupt line 5 */
#define EXTI_Line6 ((uint32_t)0x00040) /* External interrupt line 6 */
#define EXTI_Line7 ((uint32_t)0x00080) /* External interrupt line 7 */
#define EXTI_Line8 ((uint32_t)0x00100) /* External interrupt line 8 */
#define EXTI_Line9 ((uint32_t)0x00200) /* External interrupt line 9 */
#define EXTI_Line10 ((uint32_t)0x00400) /* External interrupt line 10 */
#define EXTI_Line11 ((uint32_t)0x00800) /* External interrupt line 11 */
#define EXTI_Line12 ((uint32_t)0x01000) /* External interrupt line 12 */
#define EXTI_Line13 ((uint32_t)0x02000) /* External interrupt line 13 */
#define EXTI_Line14 ((uint32_t)0x04000) /* External interrupt line 14 */
#define EXTI_Line15 ((uint32_t)0x08000) /* External interrupt line 15 */
#define EXTI_Line16 ((uint32_t)0x10000) /* External interrupt line 16 Connected to the PVD Output */
#define EXTI_Line17 ((uint32_t)0x20000) /* External interrupt line 17 Connected to the RTC
Alarm event */
#define EXTI_Line18 ((uint32_t)0x40000) /* External interrupt line 18 Connected to the
USB Device/USB OTG FS Wakeup from suspend event */
#define EXTI_Line19 ((uint32_t)0x80000) /* External interrupt line 19 Connected to the
Ethernet Wakeup event */
typedef enum
{
EXTI_Mode_Interrupt = 0x00, //设置EXTI线路为中断请求
EXTI_Mode_Event = 0x04 //设置EXTI线路为事件请求
}EXTIMode_TypeDef;
typedef enum
{
EXTI_Trigger_Rising = 0x08, //设置输入线路上升沿为中断请求
EXTI_Trigger_Falling = 0x0C, //设置输入线路下降沿为中断请求
EXTI_Trigger_Rising_Falling = 0x10 //设置输入线路上升沿和下降沿为中断请求
}EXTITrigger_TypeDef;
这里分别对0,2,3,4四个外部中断进行设置：
对K_UP键中断设置，根据电路连接，因为该键设置为下拉方式，在没有按下时为低电平，按下时为高电平，所以应设为上升沿触发。
EXTI_InitTypeDef EXTI_Struct;
EXTI_Struct.EXTI_Line = EXTI_Line0;
EXTI_Struct.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_Struct.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_Struct.EXTI_LineCmd = ENABLE;
EXTI_Init( &EXTI_Struct );
另外3个类似操作。
6、设置中断处理函数
中断服务函数有固定的函数名，在startup_stm32f10x_hd.s文件中已经定义，这里的四个中断的函数名分别为：EXTI0_IRQHandler、EXTI2_IRQHandler、EXTI3_IRQHandler和EXTI4_IRQHandler。
void EXTI0_IRQHandler( void )
{
if( EXTI_GetITStatus( EXTI_Line0 ) ==1)
{
delay_ms(10);
if(K_UP==1)
{
Sound(262);
}
}
EXTI_ClearITPendingBit( EXTI_Line0 );
}
四、项目实现
1、本项目以使用STM32GPIO读取按键实现按键操作为基础(代码下载地址)。
2、由于本项目需要用到EXTI相关库函数，所以将"stm32f10x_exti.h"、"stm32f10x_exti.c"两个文件分别复制到项目文件夹的"Lib/inc"和"Lib/src"子文件夹下，并将"stm32f10x_exti.c"文件加入到项目的"Lib "组中。
3、在项目文件夹下的"User"子文件夹下新建"Exti"子文件夹，在Keil5中新建"Exti.h"和"Exti.c"文件，并将"Exti.c"文件加入到项目的"User "组中，然后修改"Include Paths"，添加".\User\Exti"路径，以便项目中其他程序能够引用"Exti.h"。
4、在"Exti.h"文件中添加相应的宏定义和函数声明，内容如下：
#ifndef __EXTI__H
#define __EXTI__H
#include "system.h"
#include "stm32f10x_exti.h"
void KEY_EXTI_Init(void);
#endif
5、在"Exti.c"文件中实现KEY_EXTI_Init函数和四个中断函数。
#include "exti.h"
#include "key.h"
#include "stm32f10x_rcc.h"
#include "misc.h"
#include "beep.h"
#include "systick.h"
void KEY_EXTI_Init(void)
{
NVIC_InitTypeDef NVIC_Struct;
EXTI_InitTypeDef EXTI_Struct;
//1、使能IO口时钟，配置IO口为输入模式
Key_Init(); //调用key.c中的初始化按键GPIO的函数
//2、开启AFIO时钟
RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO, ENABLE );
//3、设置IO口与中断线的映射关系
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource2 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource3 );
GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4 );
//4、配置中断分组(NVIC)，使能中断
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2 );
NVIC_Struct.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_Struct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_Struct.NVIC_IRQChannelSubPriority = 3;
NVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_Struct );
NVIC_Struct.NVIC_IRQChannel = EXTI2_IRQn;
NVIC_Struct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_Struct.NVIC_IRQChannelSubPriority = 3;
NVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_Struct );
NVIC_Struct.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_Struct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_Struct.NVIC_IRQChannelSubPriority = 3;
NVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_Struct );
NVIC_Struct.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_Struct.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_Struct.NVIC_IRQChannelSubPriority = 3;
NVIC_Struct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_Struct );
//5、使能EXTI，选择触发方式
//K_UP设为上升沿触发
EXTI_Struct.EXTI_Line = EXTI_Line0;
EXTI_Struct.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_Struct.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_Struct.EXTI_LineCmd = ENABLE;
EXTI_Init( &EXTI_Struct );
//K_LEFT,K_DOWN,K_RIGHT设为下降沿触发
EXTI_Struct.EXTI_Line = EXTI_Line2|EXTI_Line3|EXTI_Line4;
EXTI_Struct.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_Struct.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_Struct.EXTI_LineCmd = ENABLE;
EXTI_Init( &EXTI_Struct );
}
void EXTI0_IRQHandler(void)
{
u8 i;
if( EXTI_GetITStatus( EXTI_Line0 ) == 1)
{
delay_ms(10);
if(K_UP==1)
{
for(i=0; i<100;i++)
Sound(262);
}
}
EXTI_ClearITPendingBit(EXTI_Line0);
}
void EXTI2_IRQHandler(void)
{
u8 i;
if( EXTI_GetITStatus( EXTI_Line2 ) == 1)
{
delay_ms(10);
if(K_LEFT==0)
{
for(i=0; i<100;i++)
Sound(294);
}
}
EXTI_ClearITPendingBit(EXTI_Line2);
}
void EXTI3_IRQHandler(void)
{
u8 i;
if( EXTI_GetITStatus( EXTI_Line3 ) == 1)
{
delay_ms(10);
if(K_DOWN==0)
{
for(i=0; i<100;i++)
Sound(330);
}
}
EXTI_ClearITPendingBit(EXTI_Line3);
}
void EXTI4_IRQHandler(void)
{
u8 i;
if( EXTI_GetITStatus( EXTI_Line4 ) == 1)
{
delay_ms(10);
if(K_RIGHT==0)
{
for(i=0; i<100;i++)
Sound(349);
}
}
EXTI_ClearITPendingBit(EXTI_Line4);
}
6、修改"main.c"文件，内容如下：
#include "SysTick.h"
#include "exti.h"
#include "beep.h"
int main()
{
SysTick_Init(72);
BEEP_Init();
KEY_EXTI_Init();
while(1)
{
}
}
7、编译，下载到开发板
史海拾趣
|
上周发贴：让我们一起DIY个 FPGA开发板， 报名喽~~~ 非常感谢大家的支持，先分享一些资料，再对电路图做完善后与大家共同探讨！ 开发板： 1、先做一个简单的FPGA开发板，小试锋芒。以ALTERA的CYCLONE1为核心，采用EP1C6Q240C8，配合EPC1S。以及LC ...… 查看全部问答＞ |
|
零起点学习STM32F107开发第2讲( 视频：STM32固件库介绍及使用MDK创建工程) 废话不多说了，请看下边视频。随后的教程我也尽量以视频的形式给出，敬请关注！$(\'swf_Y5X\').innerHTML=AC_FL_RunContent(\'width\', \'550\', \'height\', \'400\', \'allowNetworking\', \'internal\', \'allowScriptAccess\', \'never\', \'sr ...… 查看全部问答＞ |
|
这是一段Vc代码，意思就是说在一个编辑框(IDC_INPUTTEXT)中输入一句话，点击回车发送出去，同时在本地文本框（IDC_SHOWTEXT）显示出来，我想把这段代码移植到evc，编译时没有问题的，可是下载到开发板上在编辑框(IDC_INPUTTEXT)中输 ...… 查看全部问答＞ |
|
我购买了一块 yc2440的开发板，硬件构成：s3c2440+64M nandflash+64M ram，其他的都不重要了，反正它是用nandflash启动的。我把开发板内存和nandflash都扩容了一倍，成了128M，现在想自己开发一个bootloader，不知如何下手，请各位大侠指点一下。原 ...… 查看全部问答＞ |
|
在stdafx.h中加入 //{{包含eSuperMap 类库头文件 #include //}}包含eSuperMap 类库头文件 了后 也在tool---Options加了库文件后 还弹出E:\\eSuperMap\\MyeSuperMap_evc4\\MyeSuperMap_evc4\\stdafx.h(31) : fatal error C1083: Cannot ...… 查看全部问答＞ |
|
现在在做电机的相关课题，驱动器使用的是普通的功率放大电路，原理上与集成运算放大器相同，目前出现了一个问题： 上周驱动电机时电路正常工作，且带动电机正常运动。经过一段时间后，目前电路不带负载的情况下正常输出波形，但在其带负载后不能正 ...… 查看全部问答＞ |
|
各位大侠们，麻烦帮忙看看这个例子，是我毕业设计的题目，由于单片机C编程学得不精，这几天一直在调程序都没法调出来，还请各位大虾们帮帮忙！万分感激！！！ 硬件实现功能： 1、从机U2按键按下，在本机显示，同时将按键值送往主机U1，在主机显示 ...… 查看全部问答＞ |
|
美资企业,招聘 IP protocol engineer(SW 3#) 公司名称: Carrier Access 公司网址: http://www.carrieraccess.com 电子邮箱: lshi@carrieraccess.com,简历请注明信息出处 工作地点: 上海 外语要求: 英文良好 简历接收方式: 英文及中文 学历: 本科以上 职位描述： RESPONSIBILITIES: ...… 查看全部问答＞ |