因为MiniGUI的轻巧，灵活，而且还是我们国产的嵌入式GUI，我弃QT的强大首选了它来学习。由于minigui的文档挺详细的而且是汉语编写的，学习起来挺容易的。
  可是学习了这么久还是用鼠标和键盘进行操作，感觉触摸屏挺委屈的，于是从网上搜罗了一大堆的IAL移植资料，大部分都是 minigui+tslib，而且内容都基本上相同。
  
按照这些方法很快的就移植好了（我没有修改tslib的源代码），可是问题也就来了：按下去不能抬起，直到下一次按下才抬起下：
难道是我漏掉了那一节？前辈们认为tslib与mingui的压力感应相反，minigui是1为按下，而tslib为0；所以要将tslib的源代码的压力输出部分修改，可是我用程序测试tslib输出没问题啊？按下为1啊;
这是测试代码：

复制代码 #include<tslib.h> #include<stdio.h> #include <stdlib.h> int main() { int i,x,y,re; char *ts_device,input; static struct tsdev *ts; static struct ts_sample spl; if((ts_device = getenv("TSLIB_TSDEVICE")) != NULL)     {             ts = ts_open(ts_device, 0);             if(ts!=NULL)                     printf("tslib opened!\n");             re=ts_config(ts);             if(re==0)             printf("ts config ok\n");       } while(1)        {         re=-1;         printf("continue or cancel?\n");         input=getchar();         if(input=='n')           {            ts_close(ts);             return 0;            }       //  for(i=0;i<10;i++)         //  {            re=ts_read(ts,&spl,1);            if(re<0) printf("erro\n");            printf("x=%d y=%d pressure=%d \n",spl.x,spl.y,spl.pressure);        //   }        }     return 0; }

从这个测试程序我发现
tslib会缓存最近的数据，一松开设备将处于阻塞状态，当ts_open以阻塞方式打开时将0读完后，ts_read将进入阻塞状态。！

  我再分析IAL的核心函数wait_event
我贴上前辈的函数：

复制代码 static int wait_event (int which, fd_set *in, fd_set *out, fd_set *except, struct timeval *timeout) {         struct ts_sample sample;         int ret = 0;         int fd;         fd_set rfds;         int e;            if (!in)            {              in = &rfds;              FD_ZERO (in);            }        fd = ts_fd(ts);        if ((which & IAL_MOUSEEVENT) && fd >= 0)        {            printf("which is %d ",which);               FD_SET (fd, in);         }       e = select (FD_SETSIZE, in, out, except, timeout) ;        if (e > 0)        {                      if (fd > 0 && FD_ISSET (fd, in))                {                    FD_CLR (fd, in);                    ts_event.x=0;                   ts_event.y=0;                   ret = ts_read(ts, &sample, 1);                   if (ret < 0)                   {                         perror("ts_read()");                         exit(-1);                   }                   ts_event.x = sample.x;                   ts_event.y = sample.y;                   ts_event.pressure = (sample.pressure > 0 ? 4:0);                   if((ts_event.x >= 0 && ts_event.x <= 239) &&                         (ts_event.y >= 0 && ts_event.y <= 319))                         {                         mousex = ts_event.x;                          mousey = ts_event.y;                          }                    ret |= IAL_MOUSEEVENT;                   return (ret);              }       }        else if (e < 0)        {              return -1;       }        return (ret); }

当你按下去的时候可以顺利的读取数据，即wait_event返回4（鼠标左击事件）
当你松开时，设备阻塞，select将会超时，e将会等于零，导致不能用ts_read读取松开时的值即sample.pressure，所以你要是不按下去将会永远保持上次按下的状态，直到你下次的按下才会读取上次缓存松开的值即sample.pressure=0；所以导致了按下去抬起依旧保持按下去得状态。

解决的办法是：去掉select函数！直接用ts_read读取判断！
去掉select后的代码为：

复制代码 static int wait_event (int which, fd_set *in, fd_set *out, fd_set *except,struct timeval *timeout) {         struct ts_sample sample;         int ret = 0;         ts_event.x=0;         ts_event.y=0;         ret = ts_read(ts, &sample, 1);          if (ret < 0)              {                perror("ts_read()");                exit(-1);               }          ts_event.x = sample.x;          ts_event.y = sample.y;          ts_event.pressure = (sample.pressure > 0 ? 4:0);          if((ts_event.x >= 0 && ts_event.x <= 239) &&(ts_event.y >= 0 && ts_event.y <= 319))             {              mousex = ts_event.x;              mousey = ts_event.y;             }          ret |= IAL_MOUSEEVENT;          return (ret); }

注意：用这种方式ts_open的第二个参数要为0！

好，能够从源代码分析并解决问题，是成为高手的第一步。

呵呵，斑竹盛赞了，倒是挖掘源代码真的有趣

thanks

多谢楼主，问题解决！
mini2440+minigui+tslib1.4
tslib1.4源码不需改动，按网上的修改getxy()函数反而无法校正屏幕。
minigui中修改dummy.c如下：
#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include "common.h"

#include "tslib.h"

#ifdef _DUMMY_IAL

#include <sys/ioctl.h>

#include <sys/poll.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <linux/kd.h>

#include "ial.h"

#include "dummy.h"

#ifndef _DEBUG

#define _DEBUG                    // for debugging

#endif

/* for storing data reading from /dev/touchScreen/0raw */

typedef struct {

       unsigned short pressure;

       unsigned short x;

       unsigned short y;

       unsigned short pad;

} TS_EVENT;

static unsigned char state [NR_KEYS];

static int mousex = 0;

static int mousey = 0;

static TS_EVENT ts_event;

static struct tsdev *ts;

/************************ Low Level Input Operations **********************/

/*

* Mouse operations -- Event

*/

static int mouse_update(void)

{

        return 1;

}

static void mouse_getxy(int *x, int* y)

{

        if (mousex < 0) mousex = 0;

        if (mousey < 0) mousey = 0;

        if (mousex > 239) mousex = 239;

        if (mousey > 319) mousey = 319;

#ifdef _DEBUG

       // printf ("mousex = %d, mousey = %d\n", mousex, mousey);

#endif

       *x = mousex;

       *y = mousey;

}

static int mouse_getbutton(void)

{

        return ts_event.pressure;

}


static int wait_event (int which, fd_set *in, fd_set *out, fd_set *except,struct timeval *timeout)
{

        struct ts_sample sample;
        int ret = 0;
        ts_event.x=0;
        ts_event.y=0;
        ret = ts_read(ts, &sample, 1);
         if (ret < 0)
             {
               perror("ts_read()");
               exit(-1);
              }
         ts_event.x = sample.x;
         ts_event.y = sample.y;
         ts_event.pressure = (sample.pressure > 0 ? 4:0);
         if((ts_event.x >= 0 && ts_event.x <= 239) &&(ts_event.y >= 0 && ts_event.y <= 319))
            {
             mousex = ts_event.x;
             mousey = ts_event.y;
            }
         ret |= IAL_MOUSEEVENT;
         return (ret);
}



BOOL InitDummyInput(INPUT* input, const char* mdev, const char* mtype)

{

      char *ts_device = NULL;

       if ((ts_device = getenv("TSLIB_TSDEVICE")) != NULL) {

            // open touch screen event device in blocking mode

            ts = ts_open(ts_device, 0);
        printf("ts_device != NULL is done!!!!!!hkkkk\n");

      } else {

#ifdef USE_INPUT_API

             ts = ts_open("/dev/input/0raw", 0);

#else

             ts = ts_open("/dev/touchscreen/ucb1x00", 0);

#endif

      }

#ifdef _DEBUG

        printf ("TSLIB_TSDEVICE is open!!!!!!!!!!!\n");

#endif

       if (!ts) {

           perror("ts_open()");

             exit(-1);

       }

      if (ts_config(ts)) {

            perror("ts_config()");

            exit(-1);

       }

      input->update_mouse = mouse_update;

      input->get_mouse_xy = mouse_getxy;

      input->set_mouse_xy = NULL;

      input->get_mouse_button = mouse_getbutton;

      input->set_mouse_range = NULL;

      input->wait_event = wait_event;

      mousex = 0;

      mousey = 0;

      ts_event.x = ts_event.y = ts_event.pressure = 0;

       return TRUE;

}

void TermDummyInput(void)

{

      if (ts)

            ts_close(ts);

}

#endif /* _DUMMY_IAL */