超牛2.8寸触摸屏校准算法~非常的准.跟LCD坐标对称
发布: 2009-7-30 22:48 | 作者: AVR侠 | 来源: PowerAVR处女处男电子DIY网
#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,
榛子的功效与作用 Dn,
En, 属于英文
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);
大沽口 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);
}el
{
DrawPixel(x,y,0xf800);//中心点
窗外作文500字 DrawPixel(x+1,y,0xf800);
DrawPixel(x,y+1,0xf800);
DrawPixel(x+1,y+1,0xf800);
}
}
extern int TP_X[1],TP_Y[1];
#define VALUE 3 //差值
coordinate *Read_Ads7846(void)
{
coordinate Screen ;
int m0,m1,m2;
u8 count=0;
u16 databuffer[2][9]={{0},{0}};//数据组
u16 temp[3];
do //循环读数彩云姑娘9次
{
TP_GetAdXY(TP_X,TP_Y);
databuffer[0][count]=TP_X[0]; //X
databuffer[1][count]=TP_Y[0];
count++;
}
while(count<9);
if(count==9)//一定要读到9次数据,否则丢弃
{
temp[0]=(databuffer[0][0]+databuffer[0][1]+databuffer[0][2])/3;
temp[1]=(databuffer[0][3]+databuffer[0][4]+databuffer[0][5])/3;失恋语录
temp[2]=(databuffer[0][6]+databuffer[0][7]+databuffer[0][8])/3;
m0=temp[0]-temp[1];
m1=temp[1]-temp[2];
m2=temp[2]-temp[0];
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[0]+temp[2])/2;
el Screen.x=(temp[0]+temp[1])/2; }
el if(m2<m1) Screen.x=(temp[0]+temp[2])/2;
el Screen.x=(temp[1]+temp[2])/2;
temp[0]=(databuffer[1][0]+databuffer[1][1]+databuffer[1][2])/3;
temp[1]=(databuffer[1][3]+databuffer[1][4]+databuffer[1][5])/3;
temp[2]=(databuffer[1][6]+databuffer[1][7]+databuffer[1][8])/3;
m0=temp[0]-temp[1];
m1=temp[1]-temp[2];
m2=temp[2]-temp[0];
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[0]+temp[2])/2;
el Screen.y=(temp[0]+temp[1])/2; }
el if(m2<m1) Screen.y=(temp[0]+temp[2])/2;
el Screen.y=(temp[1]+temp[2])/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[3] = {
{ 712, 911 },
{ 3234, 898 },
{ 2318, 3058 }
} ;
//LCD上 对应的点
coordinate DisplaySample[3] = {
{ 45, 45 },
{ 45, 270},
{ 190,190}
} ;
/*
定义2个变量
matrix matrix ;
coordinate display ;
tCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix ) ; //送入值得到参数
什么是梦想
getDisplayPoint(&display, Read_Ads7846(), &matrix ) ;
display.x display.y 就是所的到的数字 */
unsigned char tCalibrationMatrix( coordinate * displayPtr,
coordinate * screenPtr,
matrix * matrixPtr)
{
unsigned char retValue = 0 ;
matrixPtr->Divider = ((screenPtr[0].x - screenPtr[2].x) * (screenPtr[1].y - screenPtr[2].y))
-
((screenPtr[1].x - screenPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;
if( matrixPtr->Divider == 0 )
{
retValue = 1;
}
el
{
matrixPtr->An = ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) -
((displayPtr[1].x - displayPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ;
matrixPtr->Bn = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].x - displayPtr[2].x)) -
((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].x - screenPtr[2].x)) ;
matrixPtr->Cn = (screenPtr[2].x * displayPtr[1].x - screenPtr[1].x * displayPtr[2].x) * screenPtr[0].y +
(screenPtr[0].x * displayPtr[2].x - screenPtr[2].x * displayPtr[0].x) * screenPtr[1].y +
(screenPtr[1].x * displayPtr[0].x - screenPtr[0].x * displayPtr[1].x) * screenPtr[2].y ;
matrixPtr->Dn = ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].y - screenPtr[2].y)) -
((displayPtr[1].y - displayPtr[2].y) * (screenPtr[0].y - screenPtr[2].y)) ;
matrixPtr->En = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].y - displayPtr[2].y)) -
((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].x - screenPtr[2].x)) ;
matrixPtr->Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y +
(screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y +
(screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y ;
}
return( retValue ) ;
}
unsigned char getDisplayPoint(coordinate * displayPtr,
coordinate * screenPtr,
matrix * matrixPtr )
{
unsigned char retValue =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 ;
}
el
{
retValue = 1;
}
return( retValue ) ;
} /* end of getDisplayPoint() */
