keytest.c

该文件是摩托罗拉的嵌入式芯片dragonball MX1的在嵌入式linux下键盘驱动

#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
typedef struct {
    unsigned short b;
    unsigned short x;
    unsigned short y;
    unsigned short pad;
} POS;

main()
{
   fd_set rfds;
   struct timeval tv;
   int retval;
   POS pos;

        int fileno;
    int ts, maxfd;
        int  ret= 0,i ;
        char number[10];
        memset( number , 0, 10);
/*
    ts = open("/dev/h3600_ts", O_RDONLY);
    if (ts == -1) {
        printf("open ts error\n");
        return 0;
    }
  */
    fileno = open("./keynode",O_RDONLY);
        if (fileno == -1) {
                printf("open device key error!\n");
        return 0;
    }


        for(i =0 ; i< 100;i++)
        {
        FD_ZERO(&rfds);
        FD_SET(fileno, &rfds);
        /* Wait up to five seconds. */
        tv.tv_sec = 5;
        tv.tv_usec = 0;

     //   FD_SET(ts, &rfds);
     //   maxfd =( (ts > fileno) ? ts : fileno);
        maxfd =  fileno;
        retval = select(maxfd+1, &rfds, NULL, NULL, &tv);
        /* Don't rely on the value of tv now! */
       if (retval)
       {
            printf("Data is available now.\n");
                if (FD_ISSET(fileno, &rfds))
            {
                        if (read(fileno, &number, 1) == 0)
                {
                              printf("key %d stroke\n", number[0]);
                        }
                else
                {
                              printf("read error\n");
                        }
                }
    /*        if (FD_ISSET(ts, &rfds))
            {
                read(ts, &pos, sizeof(POS));
                printf("touch panel\n");
            }*/
        }
        else
            printf("No data within five seconds.\n");
    }

        close(fileno);
        close(ts);
        return 0;

}