btnio.h

矩阵button驱动

#include <linux/ioctl.h>
#include <unistd.h>

#include "btn_ioctl_cmd.h"

#ifndef u8 
#define u8 unsigned char
#endif


//used in the function getKeyValue() and getKey();
//this is the phone key layout
static u8 key[8][4]={
                           {'*','1','4','7'},
                           {'0','2','5','8'},
                           {'#','3','6','9'},
                           {'e','h',' ','k'},
                           {' ',' ',' ',' '},
                           {' ','a','j','b'},
                           {' ',' ',' ','i'},
                           {' ',' ',' ','l'},
};


static u8 getKeyValue(u8 x,u8 position_Y);
static u8 getKey(u8 position[2]);
static u8 btnRead(int fd);

//
//the key[][] variable is global variable,which represent the phone key layout
static u8 getKeyValue(u8 x,u8 position_Y)
{ 
    
    if(!(position_Y & ~0x40)) return key[x][3];
    if(!(position_Y & ~0x20)) return key[x][2];
    if(!(position_Y & ~0x10)) return key[x][1];
    if(!(position_Y & ~0x08)) return key[x][0];
    
    printf("the position_Y key is not existing\n");
    return 0xff;
}

//
//the key[][] variable is global variable,which represent the phone key layout
static u8 getKey(u8 position[2])
{
    u8 keyValue=0;

    if(!(position[0] & 0x80)) return 'n';//hang up
    if(!(position[0] & ~0x80)) return keyValue=getKeyValue(7,position[1]);//call
    
    if(!(position[0] & ~0x81)) return keyValue=getKeyValue(0,position[1]);
    if(!(position[0] & ~0x82)) return keyValue=getKeyValue(1,position[1]);
    if(!(position[0] & ~0x84)) return keyValue=getKeyValue(2,position[1]);
    if(!(position[0] & ~0x88)) return keyValue=getKeyValue(3,position[1]);
    if(!(position[0] & ~0xa0)) return keyValue=getKeyValue(5,position[1]);
    if(!(position[0] & ~0xc0)) return keyValue=getKeyValue(6,position[1]);
    
    
    printf("the position_X key is not existing\n");
    return 0xff;
}


u8 btnRead(int fd)
{
    u8 row=0,temp_row=0,temp_col=0;
    u8 position[2]={0};
    u8 ch=0;
    int num=0;
    
    int status=0;
    
    static int hangUp_or_call=1;

    while(1)
    {
        ioctl(fd,BTN_GET_POSITION,position);
        row=position[0];
        
        temp_col=position[1];//keep the col value
        if( (row & 0x80) && (row & ~0x80))//check whether the row is what we need 
        {
            temp_row=row;//keep the row value
            
            //eliminate dither
            ioctl(fd,BTN_GET_POSITION,position);
            row=position[0];
            
            if(temp_row==row)//eliminate dither
            {
                
                ioctl(fd,BTN_GET_STATUS,&status);
                while(status) ioctl(fd,BTN_GET_STATUS,&status);
                /*
                do
                {//just ready for accepting next key value,so hold the process
                    usleep(10000);
                    //button_read(&row);
                    ioctl(fd,BTN_GET_POSITION,position);
                    row=position[0];
                    
                    if(num++>30)
                    {
                        break;
                    }
                }
                while(!(row & ~0x80) || temp_row==row);
                printf(" matrix button read temp_row:%x\n",temp_row);
                printf(" matrix button read row:%x\n",row);
                */
                
                position[0]=temp_row;
                position[1]=temp_col;
                ch=getKey(position);//get the key value
                if(ch)
                {
                    return ch;
                    break;
                }
            }
        }
        else
        {
            if(!(row & ~0x80))
            {
               // printf("=======================%x\n",row);
               if( !row  && hangUp_or_call == 1) {hangUp_or_call = 2;return 'n';}
                else if( row  && hangUp_or_call == 2 ){hangUp_or_call = 1; return 'y';}
            }
        }
    }

}