Vipin Ranka
This is the final version of Mini Gateway for Automation and Security desgined for Renesas GR Peach Design Contest
Dependencies: GR-PEACH_video GraphicsFramework HTTPServer R_BSP mbed-rpc mbed-rtos Socket lwip-eth lwip-sys lwip FATFileSystem
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Touch.cpp
00001 /************************************************************************************************** 00002 ***** ***** 00003 ***** Name: Touch.cpp ***** 00004 ***** Ver.: 1.0 ***** 00005 ***** Date: 04/01/2013 ***** 00006 ***** Auth: Frank Vannieuwkerke ***** 00007 ***** Erik Olieman ***** 00008 ***** Func: Touch driver for use with ADS7843 ***** 00009 ***** ***** 00010 ***** Code based on Carlos E. Vidales tutorial : ***** 00011 ***** How To Calibrate Touch Screens ***** 00012 ***** www.embedded.com/design/configurable-systems/4023968/How-To-Calibrate-Touch-Screens ***** 00013 ***** ***** 00014 **************************************************************************************************/ 00015 00016 #include "Touch.h" 00017 #include "mbed.h" 00018 #include "Arial12x12.h" 00019 00020 #define THRESHOLD 2 00021 00022 TouchScreenADS7843::TouchScreenADS7843(PinName tp_mosi, PinName tp_miso, PinName tp_sclk, PinName tp_cs, PinName tp_irq, ILI9486 *_LCD) 00023 : LCD(_LCD), _tp_spi(tp_mosi, tp_miso, tp_sclk), _tp_cs(tp_cs), _tp_irq(tp_irq) 00024 { 00025 DisplaySample[0].x=45; 00026 DisplaySample[0].y=45; 00027 DisplaySample[1].x=45; 00028 DisplaySample[1].y=270; 00029 DisplaySample[2].x=190; 00030 DisplaySample[2].y=190; 00031 ScreenSample[0].x=45; 00032 ScreenSample[0].y=45; 00033 ScreenSample[1].x=45; 00034 ScreenSample[1].y=270; 00035 ScreenSample[2].x=190; 00036 ScreenSample[2].y=190; 00037 _tp_cs=1; 00038 _tp_spi.frequency(500000); 00039 _tp_spi.format(8,0); // 8 bit spi mode 0 00040 } 00041 00042 int TouchScreenADS7843::Read_XY(unsigned char XY) 00043 { 00044 unsigned char msb, lsb; 00045 unsigned int Temp; 00046 00047 Temp=0; 00048 _tp_cs=0; 00049 wait_us(SPI_RD_DELAY); 00050 _tp_spi.write(XY); 00051 wait_us(SPI_RD_DELAY); 00052 msb = _tp_spi.write(0x00); // msb 00053 wait_us(SPI_RD_DELAY); 00054 lsb = _tp_spi.write(0x00); // lsb 00055 _tp_cs=1; 00056 Temp = ((msb << 8 ) | lsb); 00057 Temp >>= 3; 00058 Temp &= 0xfff; 00059 Temp /= 4; // Scaling : return value range must be between 0 and 1024 00060 return(Temp); 00061 } 00062 00063 00064 void TouchScreenADS7843::TP_GetAdXY(int *x,int *y) 00065 { 00066 int adx,ady; 00067 adx = Read_XY(CHX); 00068 wait_us(1); 00069 ady = Read_XY(CHY); 00070 *x = adx; 00071 *y = ady; 00072 } 00073 00074 void TouchScreenADS7843::TP_DrawPoint(unsigned int Xpos,unsigned int Ypos, unsigned int color) 00075 { 00076 // LCD->wr_reg(0x03, 0x1030); 00077 LCD->WindowMax(); 00078 //LCD->pixel(Xpos,Ypos,color); 00079 // LCD->pixel(Xpos+1,Ypos,color); 00080 // LCD->pixel(Xpos,Ypos+1,color); 00081 // LCD->pixel(Xpos+1,Ypos+1,color); 00082 LCD->cls(); 00083 LCD->locate(Xpos,Ypos); 00084 LCD->printf("X:%d,Y:%d",Xpos,Ypos); 00085 } 00086 00087 void TouchScreenADS7843::DrawCross(unsigned int Xpos,unsigned int Ypos) 00088 { 00089 LCD->line(Xpos-15,Ypos,Xpos-2,Ypos,White); 00090 LCD->line(Xpos+2,Ypos,Xpos+15,Ypos,White); 00091 LCD->line(Xpos,Ypos-15,Xpos,Ypos-2,White); 00092 LCD->line(Xpos,Ypos+2,Xpos,Ypos+15,White); 00093 00094 LCD->line(Xpos-15,Ypos+15,Xpos-7,Ypos+15,DarkGrey); 00095 LCD->line(Xpos-15,Ypos+7,Xpos-15,Ypos+15,DarkGrey); 00096 00097 LCD->line(Xpos-15,Ypos-15,Xpos-7,Ypos-15,DarkGrey); 00098 LCD->line(Xpos-15,Ypos-7,Xpos-15,Ypos-15,DarkGrey); 00099 00100 LCD->line(Xpos+7,Ypos+15,Xpos+15,Ypos+15,DarkGrey); 00101 LCD->line(Xpos+15,Ypos+7,Xpos+15,Ypos+15,DarkGrey); 00102 00103 LCD->line(Xpos+7,Ypos-15,Xpos+15,Ypos-15,DarkGrey); 00104 LCD->line(Xpos+15,Ypos-15,Xpos+15,Ypos-7,DarkGrey); 00105 } 00106 00107 unsigned char TouchScreenADS7843::Read_Ads7843(Coordinate * screenPtr) 00108 { 00109 int m0,m1,m2,TP_X[1],TP_Y[1],temp[3]; 00110 uint8_t count=0; 00111 int buffer[2][9]={{0},{0}}; 00112 if (screenPtr == NULL) screenPtr = &screen; 00113 do 00114 { 00115 TP_GetAdXY(TP_X,TP_Y); 00116 buffer[0][count]=TP_X[0]; 00117 buffer[1][count]=TP_Y[0]; 00118 count++; 00119 } 00120 while(!_tp_irq && (count < 9)); 00121 if(count==9) 00122 { 00123 temp[0]=(buffer[0][0]+buffer[0][1]+buffer[0][2])/3; 00124 temp[1]=(buffer[0][3]+buffer[0][4]+buffer[0][5])/3; 00125 temp[2]=(buffer[0][6]+buffer[0][7]+buffer[0][8])/3; 00126 m0=temp[0]-temp[1]; 00127 m1=temp[1]-temp[2]; 00128 m2=temp[2]-temp[0]; 00129 m0=m0>0?m0:(-m0); 00130 m1=m1>0?m1:(-m1); 00131 m2=m2>0?m2:(-m2); 00132 if( (m0>THRESHOLD) && (m1>THRESHOLD) && (m2>THRESHOLD) ) return 0; 00133 if(m0<m1) 00134 { 00135 if(m2<m0) 00136 screenPtr->x=(temp[0]+temp[2])/2; 00137 else 00138 screenPtr->x=(temp[0]+temp[1])/2; 00139 } 00140 else if(m2<m1) 00141 screenPtr->x=(temp[0]+temp[2])/2; 00142 else 00143 screenPtr->x=(temp[1]+temp[2])/2; 00144 00145 temp[0]=(buffer[1][0]+buffer[1][1]+buffer[1][2])/3; 00146 temp[1]=(buffer[1][3]+buffer[1][4]+buffer[1][5])/3; 00147 temp[2]=(buffer[1][6]+buffer[1][7]+buffer[1][8])/3; 00148 m0=temp[0]-temp[1]; 00149 m1=temp[1]-temp[2]; 00150 m2=temp[2]-temp[0]; 00151 m0=m0>0?m0:(-m0); 00152 m1=m1>0?m1:(-m1); 00153 m2=m2>0?m2:(-m2); 00154 if( (m0>THRESHOLD) && (m1>THRESHOLD) && (m2>THRESHOLD) ) return 0; 00155 00156 if(m0<m1) 00157 { 00158 if(m2<m0) 00159 screenPtr->y=(temp[0]+temp[2])/2; 00160 else 00161 screenPtr->y=(temp[0]+temp[1])/2; 00162 } 00163 else if(m2<m1) 00164 screenPtr->y=(temp[0]+temp[2])/2; 00165 else 00166 screenPtr->y=(temp[1]+temp[2])/2; 00167 return 1; 00168 } 00169 return 0; 00170 } 00171 00172 uint8_t TouchScreenADS7843::setCalibrationMatrix( Coordinate * displayPtr, 00173 Coordinate * screenPtr, 00174 Matrix * matrixPtr) 00175 { 00176 uint8_t retTHRESHOLD = 0 ; 00177 // K = (Xs0 - Xs2)*(Ys1 - Ys2) - (Xs1 - Xs2)*(Ys0 - Ys2) 00178 matrixPtr->Divider = ((screenPtr[0].x - screenPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) - 00179 ((screenPtr[1].x - screenPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ; 00180 if( matrixPtr->Divider == 0 ) 00181 { 00182 retTHRESHOLD = 1; 00183 } 00184 else 00185 { 00186 // (Xd0 - Xd2)*(Ys1 - Ys2) - (Xd1 - Xd2)*(Ys0 - Ys2) 00187 // A = --------------------------------------------------- 00188 // K 00189 matrixPtr->An = ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].y - screenPtr[2].y)) - 00190 ((displayPtr[1].x - displayPtr[2].x) * (screenPtr[0].y - screenPtr[2].y)) ; 00191 // (Xs0 - Xs2)*(Xd1 - Xd2) - (Xd0 - Xd2)*(Xs1 - Xs2) 00192 // B = --------------------------------------------------- 00193 // K 00194 matrixPtr->Bn = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].x - displayPtr[2].x)) - 00195 ((displayPtr[0].x - displayPtr[2].x) * (screenPtr[1].x - screenPtr[2].x)) ; 00196 // Ys0*(Xs2*Xd1 - Xs1*Xd2) + Ys1*(Xs0*Xd2 - Xs2*Xd0) + Ys2*(Xs1*Xd0 - Xs0*Xd1) 00197 // C = ---------------------------------------------------------------------------- 00198 // K 00199 matrixPtr->Cn = (screenPtr[2].x * displayPtr[1].x - screenPtr[1].x * displayPtr[2].x) * screenPtr[0].y + 00200 (screenPtr[0].x * displayPtr[2].x - screenPtr[2].x * displayPtr[0].x) * screenPtr[1].y + 00201 (screenPtr[1].x * displayPtr[0].x - screenPtr[0].x * displayPtr[1].x) * screenPtr[2].y ; 00202 // (Yd0 - Yd2)*(Ys1 - Ys2) - (Yd1 - Yd2)*(Ys0 - Ys2) 00203 // D = --------------------------------------------------- 00204 // K 00205 matrixPtr->Dn = ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].y - screenPtr[2].y)) - 00206 ((displayPtr[1].y - displayPtr[2].y) * (screenPtr[0].y - screenPtr[2].y)) ; 00207 // (Xs0 - Xs2)*(Yd1 - Yd2) - (Yd0 - Yd2)*(Xs1 - Xs2) 00208 // E = --------------------------------------------------- 00209 // K 00210 matrixPtr->En = ((screenPtr[0].x - screenPtr[2].x) * (displayPtr[1].y - displayPtr[2].y)) - 00211 ((displayPtr[0].y - displayPtr[2].y) * (screenPtr[1].x - screenPtr[2].x)) ; 00212 // Ys0*(Xs2*Yd1 - Xs1*Yd2) + Ys1*(Xs0*Yd2 - Xs2*Yd0) + Ys2*(Xs1*Yd0 - Xs0*Yd1) 00213 // F = ---------------------------------------------------------------------------- 00214 // K 00215 matrixPtr->Fn = (screenPtr[2].x * displayPtr[1].y - screenPtr[1].x * displayPtr[2].y) * screenPtr[0].y + 00216 (screenPtr[0].x * displayPtr[2].y - screenPtr[2].x * displayPtr[0].y) * screenPtr[1].y + 00217 (screenPtr[1].x * displayPtr[0].y - screenPtr[0].x * displayPtr[1].y) * screenPtr[2].y ; 00218 } 00219 return( retTHRESHOLD ) ; 00220 } 00221 00222 uint8_t TouchScreenADS7843::getDisplayPoint(void) 00223 { 00224 uint8_t retTHRESHOLD = 0 ; 00225 00226 if( matrix.Divider != 0 ) 00227 { 00228 // XD = AX+BY+C 00229 display.x = ( (matrix.An * screen.x) + 00230 (matrix.Bn * screen.y) + 00231 matrix.Cn 00232 ) / matrix.Divider ; 00233 // YD = DX+EY+F 00234 display.y = ( (matrix.Dn * screen.x) + 00235 (matrix.En * screen.y) + 00236 matrix.Fn 00237 ) / matrix.Divider ; 00238 } 00239 else 00240 { 00241 retTHRESHOLD = 1; 00242 } 00243 return(retTHRESHOLD); 00244 } 00245 00246 void TouchScreenADS7843::TouchPanel_Calibrate(void) 00247 { 00248 uint8_t i; 00249 Coordinate screen_cal; 00250 setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ; 00251 LCD->set_font((unsigned char*) Arial12x12); 00252 for(i=0;i<3;i++) 00253 { 00254 LCD->cls(); 00255 LCD->locate(10,10); 00256 LCD->printf("Touch crosshair to calibrate"); 00257 wait_ms(500); 00258 DrawCross(DisplaySample[i].x,DisplaySample[i].y); 00259 do {} while (!Read_Ads7843(&screen_cal)); 00260 ScreenSample[i].x= screen_cal.x;ScreenSample[i].y= screen_cal.y; 00261 } 00262 setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ; 00263 LCD->cls(); 00264 } 00265 00266 void TouchScreenADS7843::GetCalibration(Matrix * matrixPtr, Coordinate * screenPtr) 00267 { 00268 uint8_t i; 00269 Matrix * mp1; 00270 mp1 = &matrix; 00271 *matrixPtr = *mp1; 00272 for(i=0;i<3;i++) 00273 { 00274 screenPtr[i].x = ScreenSample[i].x; 00275 screenPtr[i].y = ScreenSample[i].y; 00276 } 00277 } 00278 00279 void TouchScreenADS7843::SetCalibration(Matrix * matrixPtr, Coordinate * screenPtr) 00280 { 00281 uint8_t i; 00282 Matrix * mp1; 00283 mp1 = &matrix; 00284 *mp1 = *matrixPtr; 00285 for(i=0;i<3;i++) 00286 { 00287 ScreenSample[i].x = screenPtr[i].x; 00288 ScreenSample[i].y = screenPtr[i].y; 00289 } 00290 setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ; 00291 }
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