基于STM32的矩阵键盘驱动中断方式.doc

/=Keyboard.h=/*- 本程序实现4*5键盘的扫描 从左到右，从上到下，键值 依次为1-20-*/#ifndef _KEYBOARD_H#define _KEYBOARD_H#include stm32f10x_lib.h/选择扫描模式#define Interrupt_Scan /中断扫描模式 ,要在NVIC在中打开对应中断/*可以自己定义其它扫描方式*/#define DELAY_COUNT 0x0FFFF/* 键盘控制引脚定义 */#define Keyboard_Control_Port GPIOD#define Keyboard_Line_1 GPIO_Pin_0#define Keyboard_Line_2 GPIO_Pin_1#define Keyboard_Line_3 GPIO_Pin_2#define Keyboard_Line_4 GPIO_Pin_3#define Keyboard_Line_5 GPIO_Pin_4#define Keyboard_Row_1 GPIO_Pin_5#define Keyboard_Row_2 GPIO_Pin_6#define Keyboard_Row_3 GPIO_Pin_7#define Keyboard_Row_4 GPIO_Pin_8#define Keyboard_LineBase Keyboard_Line_1#define Keyboard_RowBase Keyboard_Row_1#define Keyboard_Line (Keyboard_Line_1 | Keyboard_Line_2 | Keyboard_Line_3 | Keyboard_Line_4 | Keyboard_Line_5)#define Keyboard_Row (Keyboard_Row_1 | Keyboard_Row_2 | Keyboard_Row_3 | Keyboard_Row_4)#ifdef Interrupt_Scan /* 中断扫描模式宏定义 */#define Keyboard_EXTI_Row1 EXTI_Line5#define Keyboard_EXTI_Row2 EXTI_Line6#define Keyboard_EXTI_Row3 EXTI_Line7#define Keyboard_EXTI_Row4 EXTI_Line8#define Keyboard_EXTI_PortSource GPIO_PortSourceGPIOD#define Keyboard_EXTI_PinSource1 GPIO_PinSource5#define Keyboard_EXTI_PinSource2 GPIO_PinSource6#define Keyboard_EXTI_PinSource3 GPIO_PinSource7#define Keyboard_EXTI_PinSource4 GPIO_PinSource8#define Keyboard_IRQ_Channel EXTI9_5_IRQChannel#define Keyboard_EXTI_Line (Keyboard_EXTI_Row1 | Keyboard_EXTI_Row2 | Keyboard_EXTI_Row3 | Keyboard_EXTI_Row4)#endif /* 中断扫描模式宏定义 */* 键盘全局变量声明 */extern unsigned int Keyboard_Val ; /当前键值extern unsigned char Keyboard_Change_Flag ; /键值改变标志，读取新的键值后由主程序清零/* 键盘接口函数声明 */#ifdef Interrupt_Scanextern void Init_Keyboard_Interrupt(void) ;/键盘初始化为键盘扫描模式 #endifextern void Delay(vu32 nCount) ; /用于延时消抖#endif /* KEYBOARD_H */ /=/=Keyboard.c=/#include stm32f10x_lib.h#include Keyboard.hunsigned int Keyboard_Val = 0 ; /保存键值unsigned char Keyboard_Change_Flag = 0 ; /键值改变标志，读取键值后清零/*函数名称: Init_Keyboard_Interrupt功 能: 键盘初始化为中断扫描模式 初始化键盘需要的IO，Line1-Line5设为输出低 Row1-Row4 接上拉电阻，使能下降沿中断参 数: 无返回值 : 无*/void Init_Keyboard_Interrupt(void) GPIO_InitTypeDef GPIO_InitStructure ; EXTI_InitTypeDef EXTI_InitStructure ; EXTI_DeInit() ; /Line1-Line5设为输出高 GPIO_InitStructure.GPIO_Pin = Keyboard_Line ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; /推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz ; GPIO_Init(Keyboard_Control_Port ,&GPIO_InitStructure) ; GPIO_SetBits(Keyboard_Control_Port ,Keyboard_Line) ; /Row1-Row4设置为下拉输入，用来接收上升沿中断 GPIO_InitStructure.GPIO_Pin = Keyboard_Row; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD ; /下拉输入 GPIO_Init(Keyboard_Control_Port ,&GPIO_InitStructure) ; EXTI_ClearITPendingBit(Keyboard_EXTI_Row1) ; /清除中断标志位 GPIO_EXTILineConfig(Keyboard_EXTI_PortSource ,Keyboard_EXTI_PinSource1 ); /Pinsource不能取或 EXTI_ClearITPendingBit(Keyboard_EXTI_Row2) ; /清除中断标志位 GPIO_EXTILineConfig(Keyboard_EXTI_PortSource ,Keyboard_EXTI_PinSource2 ); EXTI_ClearITPendingBit(Keyboard_EXTI_Row3) ; /清除中断标志位 GPIO_EXTILineConfig(Keyboard_EXTI_PortSource ,Keyboard_EXTI_PinSource3 ); EXTI_ClearITPendingBit(Keyboard_EXTI_Row4) ; /清除中断标志位 GPIO_EXTILineConfig(Keyboard_EXTI_PortSource ,Keyboard_EXTI_PinSource4 ); /设置Row1-Row4为上升沿中断 EXTI_InitStructure.EXTI_Line = Keyboard_EXTI_Line; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt ; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising ; EXTI_InitStructure.EXTI_LineCmd = ENABLE ; EXTI_Init(&EXTI_InitStructure) ;/*函数名称: Delay功 能: 在扫描按键时，用于延时消抖参 数: nCount - 延时长度返回值 : 无*/void Delay(vu32 nCount) for(; nCount!= 0;nCount-);/=/=stm32f10x_it.c=/void EXTI9_5_IRQHandler(void)unsigned long tmpFlag=0 ; /保存需要的中断标志位 unsigned char i = 0 ; /循环标量 tmpFlag = EXTI-PR & Keyboard_EXTI_Line ; /只取设定过的标志位 EXTI-PR = tmpFlag ; switch(tmpFlag) /判断是哪个标志位置位 case Keyboard_EXTI_Row1: GPIO_ResetBits(Keyboard_Control_Port ,Keyboard_Line) ; for(i=0 ;i5 ;i+) /扫描方式判断按键 GPIO_SetBits(Keyboard_Control_Port ,(Keyboard_LineBasePR = Keyboard_EXTI_Row1 ;/清除中断标志 break ; case Keyboard_EXTI_Row2: GPIO_ResetBits(Keyboard_Control_Port ,Keyboard_Line) ; for(i=0 ;i5 ;i+)/扫描方式判断按键 GPIO_SetBits(Keyboard_Control_Port ,(Keyboard_LineBasePR = Keyboard_EXTI_Row2 ; /清除中断标志 break ; case Keyboard_EXTI_Row3: GPIO_ResetBits(Keyboard_Control_Port ,Keyboard_Line) ; for(i=0 ;i5 ;i+) /扫描方式判断按键 GPIO_SetBits(Keyboard_Control_Port ,(Keyboard_LineBasePR = Keyboard_EXTI_Row3 ; /清除中断标志 break ; case Keyboard_EXTI_Row4: GPIO_ResetBits(Keyboard_Co