触摸屏校准算法

1、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 电子 DIY 网#include #include ads7843drv.h#include stm32f10x_lib.h/=typedef struct POINTunsigned short x;unsigned short y; coordinate;typedef struct Matrix long doubleAn,Bn,Cn,Dn,En,Fn, Divider ; matrix ;void Delayus( int k)

2、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 = G

3、PIO_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_

4、CS(0); for(i=0;i(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;i12;i+)Delayus(5);TP_DCLK(0);Delayus(5);temp= (TP_DOUT) ? 1:0; buf|=(temp1 uno o)a|!qM!(A_dl1X_dl)AXPV199_dl:edi

5、ua；9i，n/：00=6乙马四印即 gin：0=iunoo gn2iu MOlu A:uaajos ajeuipjooo (P!OA)9gzspv_pead ajeuipjooo 甸至 / C 3niVA eujpp# !lU_d丄口乂一丄 A ujajxa !(008)X01L+A1 |,+x)|axidMBJa!(008)X01 L+AxJiaxidMeja!(008)X0A1 |,+x)|axidMBJa：(00 创 X0yX)QX!cJA/ECas|a!(j4J4xo)jee|9_po-|(乙A伽0况O?mO-m0);m仁 m10?m1J-m1);m2=m20?m2H-m2);if(

6、mOVALUE&m1VALUE&m2VALUE) return 0; if(m0m1)if(m2m0) Screen.x=(temp0+temp2)/2;else Scree n. x=(temp0+temp1)/2;else if(m2O?mO-m0);m仁 m10?m1-m1);m2=m20?m21-m2);if(mOVALUE&m1VALUE&m2VALUE) return 0;if(m0m1)if(m2m0) Screen.y=(temp0+temp2)/2;else Screen.y=(temp0+temp1)/2; else if(m2/ 液晶屏上的采样点coordinate Sc

7、reenSample3 = 712, 911 , 3234, 898 , ; 2318, 3058 /LCD 上 对应的点coordinate DisplaySample3 = 45, 45 , 45, 270, 190,190 ; /* 定义 2 个变量matrix matrix ; coordinate display ; setCalibrationMatrix( &DisplaySample0,&ScreenSample0,&matrix ) ; / 入值得到参数getDisplayPoint(&display, Read_Ads7846(), &matrix ) ;display.x

8、 display.y 就是所的到的数字 */ unsigned char setCalibrationMatrix( coordinate * displayPtr,coordinate * screenPtr,matrix * matrixPtr)unsigned char retValue = 0 ;matrixPtr-Divider = (screenPtr0.x - screenPtr2.x) * (screenPtr1.y - screenPtr2.y) -(screenPtr1.x - screenPtr2.x) * (screenPtr0.y - screenPtr2.y) ;i

9、f( matrixPtr-Divider = 0 ) retValue = 1;elsematrixPtr-An =(displayPtr0.x - displayPtr2.x) * (screenPtr1.yscreenPtr2.y)(displayPtr1.x - displayPtr2.x) * (screenPtr0.y -screenPtr2.y) ;matrixPtr-Bn = (screenPtr0.x - screenPtr2.x) * (displayPtr1.x - displayPtr2.x) -(displayPtr0.x - displayPtr2.x) * (scr

10、eenPtr1.x - screenPtr2.x) ;matrixPtr-Cn = (screenPtr2.x * displayPtr1.x - screenPtr1.x * displayPtr2.x) * screenPtr0.y +(screenPtr0.x * displayPtr2.x - screenPtr2.x * displayPtr0.x) * screenPtr1.y +(screenPtr1.x * displayPtr0.x - screenPtr0.x * displayPtr1.x) * screenPtr2.y ;matrixPtr-Dn = (displayP

11、tr0.y - displayPtr2.y) * (screenPtr1.y - screenPtr2.y) -(displayPtr1.y - displayPtr2.y) * (screenPtr0.y - screenPtr2.y) ;matrixPtr-En = (screenPtr0.x - screenPtr2.x) * (displayPtr1.y - displayPtr2.y) -(displayPtr0.y - displayPtr2.y) * (screenPtr1.x - screenPtr2.x) ;matrixPtr-Fn = (screenPtr2.x * dis

12、playPtr1.y - screenPtr1.x * displayPtr2.y) * screenPtr0.y +(screenPtr0.x * displayPtr2.y - screenPtr2.x * displayPtr0.y) * screenPtr1.y +(screenPtr1.x * displayPtr0.y - screenPtr0.x * displayPtr1.y) * screenPtr2.y ;return( retValue ) ;un sig ned char getDisplayPo in t(coord in ate * displayPtr,coord

13、 in ate * scree nPtr, matrix * matrixPtr )un sig ned char retValue =0 ;if( matrixPtr-Divider != 0 )displayPtr-x =(matrixPtr-A n * scree nPtr-x) + (matrixPtr-B n * scree nPtr-y) + matrixPtr-C n)/ matrixPtr-Divider ;displayPtr-y =(matrixPtr-D n * scree nPtr-x) +(matrixPtr-E n * scree nPtr-y) +matrixPt

14、r- Fn)/ matrixPtr-Divider ;elseretValue = 1;return( retValue ); /* end of getDisplayPoint() */AVR 侠(2009-7-30 22:51:51)调用的时候在主函数中加入setCalibrationMatrix( &DisplaySampleO,&ScreenSampleO,&mat) ; /送入值得到参数while(1)getDisplayPoint(&display, Read_Ads7846(), & mat );TP_DrawPoint(display.x,display.y);就是初始化时候会

15、有干扰会自己打几个点AVR 侠(2009-7-30 23:08:31)工程文件 渗 STM32.rar(2009-07-30 23:08:31, Size: 2.67 MB, Downloads: 359)PowerAVR (2009-7-30 23:48:26)谢谢楼主的分享.wxmtwfx (2009-7-31 16:30:14)工程无法运行一直在 BKPT 0XAB我的CPU是103REotw518 (2009-7-31 17:24:52)跟着大虾跑，爽呀！AVR 侠(2009-8-01 12:52:47)i=s 本帖最后由 AVR侠 于2009-8-2 01:04 编辑校准算法原理自己

16、复制一下程序 就可以了 工程文件是测试用的.比较乱，建议复制程序到自己工程 里面 澎触摸屏算法.pdf(2009-08-01 12:52:47, Size: 119 KB, Downloads: 255) otw518 (2009-8-01 22:31:49)送入值得到setCalibrationMatrix( &DisplaySample0,&ScreenSample0,&matrix ) ; /好像没有写取点值(DisplaySample,ScreenSample)函数,还是需要自己写？AVR 侠(2009-8-02 00:46:29)i=s本帖最后由 AVR侠 于2009-8-2 01:

17、08 编辑/液晶屏上的采样点coordinate ScreenSample3=； 712, 911 , 2318, 3058 3234, 898 ,/LCD 上对应的点coordinate DisplaySample3= 45, 45 , 45, 270, 190,190;这是LCD坐标.跟触摸屏 得到的值.是入口参数 经过函数setCalibrationMatrix( & DisplaySampleO,&ScreenSampleO,&matrix );得到的参是放到matrix 里面.在经过函数 getDisplayPoint(&display, Read_Ads7846(), & matr

18、ix );计算出X Y的值.存放在display里面otw518 (2009-8-02 22:01:27)谢谢回答,我是想问不同的触摸屏ScreenSample,DisplaySample不一样,需要要安排一个取这些数据的函数,适合别的触摸屏用.AVR 侠(2009-8-03 10:58:23)i=s本帖最后由 AVR侠于2009-8-3 13:41 编辑这个是要自己校准的,也可以自己写一个程序.分别打岀LCD坐标的点然后一个个的按下.程序就采到 触摸屏的值再调用函数，就可以自动校准了 .ljh1980(2009-9-01 15:22:02)LZ,我按PDF文档的算法，得出公式后，代入文档举例所说的数据，怎么得不到相应的LCD屏上的坐标呢？AVR 侠(2009-9-01 16:40:47)能不能得到触摸屏的采样 AD值先?ljh1980(2009-9-01 18:22:26)不太明白它公式中的Xd = AX+BY+CYd = DX+EY+F如果触摸的X不变，只是改变 Y,那么Xd也变化吗，实际上 Xd是不变化的呀，即只是在 Y轴上改变数据，不应该影响Xd的数据的，请赐教ljh1980(2009-9-0