Android系统移植 之 touch

转：http://hi.baidu.com/xx%B9%C2%D3%B0%C6%AE%C1%E3xx/blog/item/d8257c44941db12bcefca3c1.html

   我们现在就开始移植工作吧。首先把你的tslibonandroid文件包解压，放入external\tslibonandroid目录，这个文件夹中的tests\ts_calibrate.c具体实现触摸屏的校验，具体情形之后分析。

   Android平台APP是要跑Java的，所以我们在此必须建立一个Java应用程序，实现我们在显示屏上的操作。在\development\calibrate\app_calibrate\src\com\android\calibrate添加源码，具体代码如下：

package com.android.calibrate;

import android.app.Activity;

import android.widget.TextView;

import android.os.Bundle;

public class Calibrate extends Activity

{

    @Override

    public void onCreate(Bundle savedInstanceState)

    {

        super.onCreate(savedInstanceState);

//        super.onCreate(savedInstanceState);

//        setContentView(R.layout.main);

  tsmainloop();      

    }

    public native void tsmainloop();

    static {

        System.loadLibrary("calibrate-jni");

    }

}

有了Java程序也不行，因为我们需要Java本地接口（即JNI），来实现Java与C本地库的交互，在development\calibrate\app_calibrate\ts_calibrate\jni\添加我们的JNI源码，代码如下：

#include <utils/Log.h>

#include <nativehelper/jni.h>

#include <stdio.h>

#include "../../../external/tslibonandroid/tests/calibratejni.h"

static void tsmainloop(JNIEnv *env, jobject object)

{

LOGE("hello jni calirate\n");

ts_main();

}

static const char *classPathName = "com/android/calibrate/Calibrate";

static JNINativeMethod methods[] = {                             //方法列表

{"tsmainloop", "()V", (void*)tsmainloop },

};

static int registerNativeMethods(JNIEnv* env, const char* className,

    JNINativeMethod* gMethods, int numMethods)               //方法的注册

{

    jclass clazz;

    clazz = env->FindClass(className);

    if (clazz == NULL) {

        fprintf(stderr, "Native registration unable to find class '%s'", className);

        return JNI_FALSE;

    }

    if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {

        fprintf(stderr, "RegisterNatives failed for '%s'", className);

        return JNI_FALSE;

    }

    return JNI_TRUE;

}

static int registerNatives(JNIEnv* env)

{

if (!registerNativeMethods(env, classPathName,

                 methods, sizeof(methods) / sizeof(methods[0]))) {

    return JNI_FALSE;

}

return JNI_TRUE;

}

typedef union {

    JNIEnv* env;

    void* venv;

} UnionJNIEnvToVoid;

jint JNI_OnLoad(JavaVM* vm, void* reserved)

{

    UnionJNIEnvToVoid uenv;

    uenv.venv = NULL;

    jint result = -1;

    JNIEnv* env = NULL;

    printf("JNI_OnLoad");

    if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {

        fprintf(stderr, "GetEnv failed");

        goto bail;

    }

    env = uenv.env;

    if (!registerNatives(env)) {

        fprintf(stderr, "registerNatives failed");

    }

    result = JNI_VERSION_1_4;

bail:

    return result;

}

这部分主要实现JNI的注册及对下层提供调用接口。

3.touch校验

   上面有提到ts_main()，它具体在\external\tslibonandroid\tests\ts_calibrate.c文件中,主要是实现5点校验。

#define TSLIB_TSDEVICE   "/dev/input/event1"          

#define DEVICE_NAME      "/dev/myts"                          //myts设备名

#define TSLIB_CALIBFILE "/system/etc/pointercal"

#define TS_POINTERCAL    "/system/etc/pointercal"

int ts_main()

{

struct tsdev *ts;

    calibration cal;

int cal_fd;

    char cal_buffer[256];

    char *tsdevice = NULL;

    char *calfile = NULL;

    unsigned int i;

    unsigned int ret;

    signal(SIGSEGV, sig);

    signal(SIGINT, sig);

    signal(SIGTERM, sig);

    int size;

    char buffer[5] = "OK";

    int fd = open("/dev/myts",O_RDWR);

    if(fd == -1)

    {

   LOGE("...open device failed 1...");

   return -1;

    }

    printf("fd: %d\n",fd);

    write(fd,buffer,2);

    close(fd);

    if( (tsdevice = getenv("TSLIB_TSDEVICE")) != NULL )

    {

   ts = ts_open(tsdevice,0);

   LOGE("---tsdevice:%s getenv(TSLIB_TSDEVICE)!=NULL-----\n",tsdevice);

    }

    else

    {

      if (!(ts = ts_open("/dev/input/event1", 0)))

      {

   LOGE("---ts_open(/dev/input/event1)---failed\n");  

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

      }

     }

LOGE("ts configure\n");

if (!ts) {

   LOGE("ts open failed\n");

   ret = -1;

   goto end;

}

if (ts_config(ts)) {

   perror("ts_config");

   LOGE("ts config failed\n");

   ret = -1;

   goto end;

}

    if (open_framebuffer()) {

   close_framebuffer();

   LOGE("open_framebuffer failed\n");

   ret = -1;

   goto end;

}

for(i = 0; i < NR_COLORS; i++)

   setcolor (i, palette [i]);

   put_string_center (xres / 2, yres / 4, "TSLIB calibration utility", 1);

   put_string_center (xres / 2, yres / 4 + 20, "Touch crosshair to calibrate", 2);

   // printf("xres = %d, yres = %d\n", xres, yres);

   // Clear the buffer

   clearbuf(ts);

   get_sample (ts, &cal, 0, 50,        50,        "Top left");

   clearbuf(ts);

   get_sample (ts, &cal, 1, xres - 50, 50,        "Top right");

   clearbuf(ts);

   get_sample (ts, &cal, 2, xres - 50, yres - 50, "Bot right");

   clearbuf(ts);

   get_sample (ts, &cal, 3, 50,        yres - 50, "Bot left");

   clearbuf(ts);

   get_sample (ts, &cal, 4, xres / 2, yres / 2, "Center");

if(perform_calibration (&cal)) {

   LOGE("Calibration constants: ");

   for (i = 0; i < 7; i++)

    LOGE("%d ", cal.a [i]);

   if ((calfile = getenv("TSLIB_CALIBFILE")) != NULL) {

    cal_fd = open (calfile, O_CREAT | O_RDWR,S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

    LOGE("getenv(TSLIB_CALIBFILE) OK");

   } else {

    cal_fd = open (TS_POINTERCAL, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);

    LOGE("getenv(TSLIB_CALIBFILE) NULL");

   }

   sprintf (cal_buffer,"%d %d %d %d %d %d %d",cal.a[1], cal.a[2], cal.a[0],cal.a[4], cal.a[5], cal.a[3], cal.a[6]);

   write (cal_fd, cal_buffer, strlen (cal_buffer) + 1);

   close (cal_fd);

   i = 0;

} else {

   LOGE("Calibration failed...");

   i = -1;

}

close_framebuffer();

goto end2;

end:

   i = ret;

end2:

   #if 1

   strcpy(buffer,"END");

   fd = open("/dev/myts",O_RDWR);

   if(fd == -1)

   {

    //   printf("...open device failed...\n");

    LOGE("...open device failed 2...");

    return -1;

   }

   printf("fd: %d\n",fd);

   write(fd,buffer,3);

   close(fd);

   #endif

//---------------------------------------

return i;  

}