关于触摸屏校正算法，大家支支招，最近买了个触摸屏，想做个校正 (amobbs.com 阿莫电子技术论坛) -

END12345678 发表于 2009-8-2 17:50:36

关于触摸屏校正算法，大家支支招，最近买了个触摸屏，想做个校正

关于触摸屏校正算法，大家支支招，最近买了个触摸屏，想做个校正。
自己做的程序不够精准，谢谢

ivws 发表于 2009-8-2 17:52:41

关注中。。。。

END12345678 发表于 2009-8-2 17:58:47

似乎wince内核中自带有校正算法，
我现在是直接用单片机来控制触摸屏，

END12345678 发表于 2009-8-2 18:44:32

沉的好快啊

junmadianzi 发表于 2009-8-2 19:39:11

我看到的做法是,左上角一点,右下角一点,测试后提问是否重设

bad_fpga 发表于 2009-8-2 19:52:24

以前不知在哪下载的,没试过,你看看行不行
触摸屏校准原理ourdev_466645.rar(文件大小:92K) (原文件名:触摸屏校准原理.rar)

avrtyx 发表于 2009-8-3 10:55:08

这里有程序 http://www.poweravr.com/bbs/viewthread.php?tid=231 LCD和触摸屏间的误差角度非常小就可以用这个算法

xyq4513 发表于 2009-8-3 12:49:19

Mark

xixiangfeng 发表于 2010-8-28 23:47:44

高手解释一下这个算法流程...
#include <string.h>
#include "ads7843drv.h"
#include "stm32f10x_lib.h"

//====================================================================================

typedef       struct POINT
      {
      unsigned short x;
      unsigned short y;
      }coordinate;

typedef struct Matrix {

                  long double An,
                              Bn,
                              Cn,
                              Dn,
                              En,
                              Fn,
                              Divider ;
                  } matrix ;

void Delayus( int k)
{
int j;
for(j=k;j > 0;j--);
}
//====================================================================================
void TP_Init(void)
{
// IODIR1 = 0x00;
//IODIR1 = IODIR1 | MASK_CS | MASK_DCLK | MASK_DIN;
      GPIO_InitTypeDef GPIO_InitStructure;
   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_4 | GPIO_Pin_5|GPIO_Pin_7;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;             //推挽输出
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);
   GPIO_InitStructure.GPIO_Pin =GPIO_Pin_0 | GPIO_Pin_1;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
   GPIO_Init(GPIOB, &GPIO_InitStructure);

}
//====================================================================================
static void WR_CMD (unsigned char cmd)
{
unsigned char buf;
unsigned char i;
TP_CS(1);
TP_DIN(0);
TP_DCLK(0);
TP_CS(0);
for(i=0;i<8;i++)
{
   buf=(cmd>>(7-i))&0x1;
   TP_DIN(buf);
   Delayus(5);
   TP_DCLK(1);
   Delayus(5);
   TP_DCLK(0);
}
}
//====================================================================================
static unsigned short RD_AD(void)
{
unsigned short buf=0,temp;
unsigned char i;
TP_DIN(0);
TP_DCLK(1);
for(i=0;i<12;i++)
{
   Delayus(5);
   TP_DCLK(0);
   Delayus(5);
   temp= (TP_DOUT) ? 1:0;
   buf|=(temp<<(11-i));

   Delayus(5);
   TP_DCLK(1);
}
TP_CS(1);
buf&=0x0fff;
return(buf);
}
//====================================================================================
int Read_X(void)
{
int i;
WR_CMD(CHX);
// while(TP_BUSY);
Delayus(5);
i=RD_AD();
return i;
}
//====================================================================================
int Read_Y(void)
{
int i;
WR_CMD(CHY);
//while(TP_BUSY);
Delayus(5);
i=RD_AD();
return i;
}
//====================================================================================
void TP_GetAdXY(int *x,int *y)
{
int adx,ady;
adx=Read_X();
ady=Read_Y();
*x=adx;
*y=ady;
}

void TP_DrawPoint(u8 x,u16 y)
{
   if(x>220&&y<12)
   {
            Lcd_Clear(0xffff);
   }else
   {
            DrawPixel(x,y,0xf800);//中心点
            DrawPixel(x+1,y,0xf800);
            DrawPixel(x,y+1,0xf800);
            DrawPixel(x+1,y+1,0xf800);
   }
}
extern int TP_X,TP_Y;
#defineVALUE 3//差值
coordinate *Read_Ads7846(void)
{
coordinateScreen ;
int m0,m1,m2;
   u8 count=0;
   u16 databuffer={{0},{0}};//数据组
   u16 temp;
do                                        //循环读数9次
   {
         TP_GetAdXY(TP_X,TP_Y);
                     databuffer=TP_X;//X
                     databuffer=TP_Y;
                     count++;
   }
   while(count<9);
   if(count==9)//一定要读到9次数据,否则丢弃
   {
      temp=(databuffer+databuffer+databuffer)/3;
      temp=(databuffer+databuffer+databuffer)/3;
      temp=(databuffer+databuffer+databuffer)/3;
      m0=temp-temp;
      m1=temp-temp;
      m2=temp-temp;

      m0=m0>0?m0-m0);
      m1=m1>0?m1-m1);
      m2=m2>0?m2-m2);
      if(m0>VALUE&&m1>VALUE&&m2>VALUE) return 0;
      if(m0<m1){if(m2<m0) Screen.x=(temp+temp)/2;
                  else Screen.x=(temp+temp)/2;    }
      else if(m2<m1) Screen.x=(temp+temp)/2;
                  else Screen.x=(temp+temp)/2;

temp=(databuffer+databuffer+databuffer)/3;
      temp=(databuffer+databuffer+databuffer)/3;
      temp=(databuffer+databuffer+databuffer)/3;
      m0=temp-temp;
      m1=temp-temp;
      m2=temp-temp;

      m0=m0>0?m0-m0);
      m1=m1>0?m1-m1);
      m2=m2>0?m2-m2);
      if(m0>VALUE&&m1>VALUE&&m2>VALUE) return 0;

      if(m0<m1){if(m2<m0) Screen.y=(temp+temp)/2;
                  else Screen.y=(temp+temp)/2;    }
      else if(m2<m1) Screen.y=(temp+temp)/2;
                  else Screen.y=(temp+temp)/2;
               return &Screen;
            }
   return 0;
}


      //只有在LCD和触摸屏间的误差角度非常小时，才能运用上面公式
      //3个采样点必须不太靠近触摸屏边缘，他们的间隔必须足够大->


      //液晶屏上的采样点
coordinate ScreenSample =    {
                                       { 712, 911 },
                                                                                    { 3234, 898 },
                                       { 2318, 3058 }
                           } ;

      //LCD上对应的点
coordinate DisplaySample = {
                                       { 45, 45 },
                                                                                    { 45, 270},
                                       { 190,190}
                                 } ;
/*
定义2个变量
matrix matrix ;
coordinatedisplay ;

setCalibrationMatrix( &DisplaySample,&ScreenSample,&matrix ) ;//送入值得到参数
getDisplayPoint(&display, Read_Ads7846(), &matrix ) ;
display.x display.y就是所的到的数字 */

unsigned char setCalibrationMatrix( coordinate * displayPtr,
                     coordinate * screenPtr,
                     matrix * matrixPtr)
{

unsigned charretValue = 0 ;

matrixPtr->Divider = ((screenPtr.x - screenPtr.x) * (screenPtr.y - screenPtr.y)) -
                     ((screenPtr.x - screenPtr.x) * (screenPtr.y - screenPtr.y)) ;

if( matrixPtr->Divider == 0 )
{
   retValue = 1;
}
else
{
   matrixPtr->An = ((displayPtr.x - displayPtr.x) * (screenPtr.y - screenPtr.y)) -
                     ((displayPtr.x - displayPtr.x) * (screenPtr.y - screenPtr.y)) ;

   matrixPtr->Bn = ((screenPtr.x - screenPtr.x) * (displayPtr.x - displayPtr.x)) -
                     ((displayPtr.x - displayPtr.x) * (screenPtr.x - screenPtr.x)) ;

   matrixPtr->Cn = (screenPtr.x * displayPtr.x - screenPtr.x * displayPtr.x) * screenPtr.y +
                     (screenPtr.x * displayPtr.x - screenPtr.x * displayPtr.x) * screenPtr.y +
                     (screenPtr.x * displayPtr.x - screenPtr.x * displayPtr.x) * screenPtr.y ;

   matrixPtr->Dn = ((displayPtr.y - displayPtr.y) * (screenPtr.y - screenPtr.y)) -
                     ((displayPtr.y - displayPtr.y) * (screenPtr.y - screenPtr.y)) ;

   matrixPtr->En = ((screenPtr.x - screenPtr.x) * (displayPtr.y - displayPtr.y)) -
                     ((displayPtr.y - displayPtr.y) * (screenPtr.x - screenPtr.x)) ;

   matrixPtr->Fn = (screenPtr.x * displayPtr.y - screenPtr.x * displayPtr.y) * screenPtr.y +
                     (screenPtr.x * displayPtr.y - screenPtr.x * displayPtr.y) * screenPtr.y +
                     (screenPtr.x * displayPtr.y - screenPtr.x * displayPtr.y) * screenPtr.y ;
}

return( retValue ) ;
}

unsigned char getDisplayPoint(coordinate * displayPtr,
                  coordinate * screenPtr,
                  matrix * matrixPtr )
{
unsigned charretValue =0 ;

if( matrixPtr->Divider != 0 )
{

   displayPtr->x = ( (matrixPtr->An * screenPtr->x) +
                     (matrixPtr->Bn * screenPtr->y) +
                        matrixPtr->Cn
                     ) / matrixPtr->Divider ;

   displayPtr->y = ( (matrixPtr->Dn * screenPtr->x) +
                     (matrixPtr->En * screenPtr->y) +
                        matrixPtr->Fn
                     ) / matrixPtr->Divider ;
}
else
{
   retValue = 1;
}

return( retValue ) ;

} /* end of getDisplayPoint() */

rtems 发表于 2010-8-29 00:09:05

参考tslib吧。

wanglituan 发表于 2010-8-29 00:48:04

牛

ioro55555 发表于 2010-12-23 11:27:26

我是用Ax+By+C和Dx+Ey+F，三点组成一个六元一次方程组，解矩阵算的，很准。

liusoldier 发表于 2010-12-23 12:27:10

这个有例程的，坛子里就有。在那个16080屏的讨论贴里。

xieguangye 发表于 2010-12-24 15:36:46

MARK

peavey 发表于 2011-1-15 23:13:40

记号

ringan865 发表于 2011-1-16 14:11:47

mark

joni 发表于 2011-1-16 14:15:07

mark

bg9cr 发表于 2013-11-22 09:04:07

学不会呀，需要恶补！！！

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关于触摸屏校正算法，大家支支招，最近买了个触摸屏，想做个校正