编译i8320内核，让其支持多点触摸

最新推荐文章于 2025-04-19 17:53:39 发布

原创最新推荐文章于 2025-04-19 17:53:39 发布 · 3.6k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#distance #file #report #processing #工作

本文介绍了一种针对i8320内核版本及tinyx不支持MT的问题解决方案，通过修改内核配置及驱动实现多点触控功能，并提供了具体的驱动源码及应用程序读取示例。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

编译内核：
参考http://www.limofans.com/forum.ph ... tid=5353&page=1
不过里面有一个地方是错误的：
CONFIG_KPL不能取消，取消后会造成dcm模块无法加载，无法控制led亮度。
编译KPL需要添加包含目录：
CFLAGS_KERNEL = -march=armv7-a -I./drivers/txsr/Inc

多点：
i8320内核版本及tinyx版本不支持现在流行的MT。有几个方法可以解决这个问题。
1）升级内核输入部分、升级tinyx。（需要做很多工作）
2）把驱动该为双鼠标模式（现在的版本支持,需要把驱动编译成可加载模块，以便调试。这个不难，谁有时间可以尝试一下）
3）改一下驱动，让应用程序直接访问。（30分钟搞定，目前gba0.7使用的方法）

在sysfs里面增加一个目录directtouchop，应用程序直接读取
static DEVICE_ATTR(directtouchop, S_IRUGO | S_IWUSR, direct_touch_show, direct_touch_store);

直接读取驱动源码：
http://www.115disk.com/viewfile.php?file_id=18271&file_key=h9CbSNpM

应用程序读取sysfs示例：
void read_touch(void)
{
char buf[1024];
int finger_type,finger_switched,x1,y1,x2,y2;
FILE * file=fopen("/sys/class/input/input1/directtouchop","r");
while(fscanf(file,"%d,%d,%d,%d,%d,%d",&finger_type,&finger_switched,&x1,&y1,&x2,&y2)!=EOF) {
process_finger_type(finger_type,finger_switched,800-y1,x1,800-y2,x2);
}
fclose(file);

}

void clear_touch(void)
{
char a='1';
FILE * file=fopen("/sys/class/input/input1/directtouchop","w");
fwrite(&a,1,1,file);
fclose(file);
}

static unsigned short syna_old_x_position = 0;
static unsigned short syna_old_y_position = 0;
static unsigned short syna_old_x2_position = 0;
static unsigned short syna_old_y2_position = 0;
static int syna_old_old_finger_type=0;
static int syna_old_finger_type = 0;

int distance(int x1, int y1, int x2, int y2)
{
int diffx,diffy;
if(x1>x2) {
  diffx=x1-x2;
}
else diffx=x2-x1;
if(y1>y2)
  diffy=y1-y2;
else
  diffy=y2-y1;
if(diffy>diffx)
  return diffy;
else
  return diffx;
}

void process_finger_type(int finger_type,int finger_switched,int x_position,int y_position, int x2_position,int y2_position)
{
if ((finger_type > 0) && (finger_type < 7))  // press
{
  //same point filtering
  if( finger_type == syna_old_finger_type)
  {
   if(distance(x_position,y_position,syna_old_x_position,syna_old_y_position)<30&&
    distance(x2_position,y2_position,syna_old_x2_position,syna_old_y2_position)<30)
   {
    return;
   }
  }
  //end same point filtering
  dprintf("finger_type=%d finger_switched=%d/n",finger_type,finger_switched);
  syna_old_x_position = x_position;
  syna_old_y_position = y_position;
  syna_old_x2_position = x2_position;
  syna_old_y2_position = y2_position;

  if((syna_old_finger_type==3) || (syna_old_finger_type==4))
  {
   if((finger_type == 2) || (finger_type == 5)) {
    if((syna_old_old_finger_type == 1) || (syna_old_old_finger_type == 6)) {
     buttonRelease(finger1);
    }
   }
   else if((finger_type == 1) || (finger_type == 6)) {
    if((syna_old_old_finger_type == 2) || (syna_old_old_finger_type == 5)) {
     buttonRelease(finger2);
    }
   }
  }

  int skip_report=0;
  //send press event
  if((finger_type == 1) || (finger_type == 2) || (finger_type == 5) || (finger_type == 6)) {
   if(finger_type == 1) {
    if(syna_old_finger_type == 2) {
     buttonRelease(finger2);
    }
    else if(syna_old_finger_type==3) {
     skip_report=1;
     buttonRelease(finger2);
    }
   }
   else if(finger_type == 2) {
    if(syna_old_finger_type == 1) {
     buttonRelease(finger1);
    }
                                else if(syna_old_finger_type==3) {
                                        skip_report=1;
                                        buttonRelease(finger1);
                                }

   }
   if(skip_report) {

   }
   else if(finger_switched == 0) {
    buttonPress(finger1,x_position,y_position);
   }
   else {
    buttonPress(finger2,x2_position,y2_position);
   }
  }
  else if((finger_type == 3) || (finger_type == 4)) {
   if((syna_old_finger_type == 1)||(syna_old_finger_type == 6)){
    buttonPress(finger2,x2_position,y2_position);
   }
   else if((syna_old_finger_type == 2)||(syna_old_finger_type == 5)) {
    buttonPress(finger1,x_position,y_position);
   }
   else {
    buttonPress(finger1,x_position,y_position);
    buttonPress(finger2,x2_position,y2_position);
   }

}
}
//end press event((finger_type > 0) && (finger_type < 7))

/////////////////////////////////////////////    release event processing start   //////////////////////////////////////////////////
else if(finger_type == 0)
{
  buttonRelease(finger1);
  buttonRelease(finger2);

  finger_switched = 0;
  syna_old_x_position = -1;
  syna_old_y_position = -1;
  syna_old_x2_position = -1;
  syna_old_y2_position = -1;

}

syna_old_finger_type = finger_type;
if((syna_old_finger_type != 3) && (syna_old_finger_type != 4))
syna_old_old_finger_type = finger_type;

}

完整代码下载：

http://www.115disk.com/viewfile.php?file_id=18272&file_key=hLSWgjG3