linux和qtopia下的矩阵键盘驱动程序.docVIP

linux和qtopia下的矩阵键盘驱动程序 基于s3c2440和linux，实现了3*4的矩阵键盘驱动。 功能：延时消抖，重复按键，多键齐按（？？） 更详细的说明文档：“基于S3C24440和嵌入式Linux的矩阵键盘设计”，电子技术，2008,45(5):21-23 /*********************************************************** s3c2440-keyboard.c** keyboard driver for S3C2440 based PDA*** History:2007/04/30*************************************************************/ #include linux/config.h#include linux/module.h#include linux/kernel.h#include linux/init.h#include linux/miscdevice.h#include linux/sched.h#include linux/delay.h#include linux/poll.h#include linux/spinlock.h#include asm/irq.h#include asm/arch/irq.h#include asm/arch/irqs.h#include asm/arch/clocks.h#include asm/hardware.h#include asm/arch/S3C2440.h #define DEVICE_NAME s3c2440-kb //键盘设备名 static int kbMajor = 0; //默认的主设备号 #define MAX_KB_BUF 10 //循环队列的尺寸 typedef struct {unsigned int keyStatus;int irq;// int timeCount;u_short buf[MAX_KB_BUF]; /* 循环队列*/unsigned int head, tail; /* 循环队列的读写指针*/spinlock_t lock; /*锁*/} KB_DEV; static KB_DEV kbdev; #define KEY_UP 0 //按键弹起#define KEY_DOWN 1 //按键按下#define NO_KEY_DOWN 2 //没有键按下 #define EINT1_DOWN 0#define EINT3_DOWN 1#define EINT8_DOWN 2#define NO_EINT_DOWN 3 /*循环队列操作*/#define BUF_HEAD (kbdev.buf[kbdev.head])#define BUF_TAIL (kbdev.buf[kbdev.tail])#define INCBUF(x) if((++x)==MAX_KB_BUF) x=0 /*定时器设置*/#define KB_TIMER_DELAY (HZ/50) /*HZ表示每秒产生的时钟滴答数,定时器超时为20ms*/#define REPEAT_START_DELAY (HZ) /* 自动重复开始延时:1秒*/#define REPEAT_DELAY (HZ/2) /*自动重复延时:0.5秒*/ static struct timer_list kb_timer;static struct timer_list repeat_timer;spinlock_t repeat_lock;static int timeCount =1;static int TIME_OUT =5; /*键盘矩阵*/ static u_short keyboard_code_map[4][3]={{1 , 2 , 3 },{4 , 5 , 6 },{7 , 8 , 9 },{10, 11, 12}}; //每个按键对应的键盘码static u_short pre_keyboard_code = 0; //上次扫描得到的按键值static u_short curr_keyboard_code = 0;//当前扫描得到的按键值static u_short snap_keyboard_code[4][3]={{0 , 0 , 0 },{0 , 0 , 0 },{0 , 0 , 0 },{0, 0, 0}}; //临时按键值#define DETECTION_THROLD 3 static int re