基于STM32的矩阵键盘驱动(中断方式)

//==========================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 #define Keyboard_Line_2 #define Keyboard_Line_3 #define Keyboard_Line_4 #define Keyboard_Line_5 #define Keyboard_Row_1 #define Keyboard_Row_2 #define Keyboard_Row_3 #define Keyboard_Row_4

#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 #define Keyboard_EXTI_Row2

#define Keyboard_EXTI_Row3

#define Keyboard_EXTI_Row4

EXTI_Line5

EXTI_Line6 EXTI_Line7 EXTI_Line8 #define Keyboard_EXTI_PortSource GPIO_PortSourceGPIOD

#define Keyboard_EXTI_PinSource1 GPIO_PinSource5

#define Keyboard_EXTI_PinSource2 GPIO_PinSource6

GPIO_Pin_0

GPIO_Pin_1 GPIO_Pin_2 GPIO_Pin_3 GPIO_Pin_4 GPIO_Pin_5 GPIO_Pin_6

GPIO_Pin_7 GPIO_Pin_8

#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_Scan

extern void Init_Keyboard_Interrupt(void) ;// 键盘初始化为键盘扫描模式

#endif

extern void Delay(vu32 nCount) ; // 用于延时消抖

#endif /* KEYBOARD_H */

//=================================================================//

//============================Keyboard.c=============================// #include "stm32f10x_lib.h"

#include "Keyboard.h"

unsigned 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