Radu Radoveneanu
Basically i glued Peter Drescher and Simon Ford libs in a GraphicsDisplay class, then derived TFT or LCD class (which inherits Protocols class), then the most derived ones (Inits), which are per-display and are the only part needed to be adapted to diff hw.
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UniGraphic
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GraphicsDisplay
Revision 22:62f3bed03503, committed 2015-05-06
- Comitter:
- rakware
- Date:
- Wed May 06 16:52:07 2015 +0000
- Parent:
- 21:ae0a4eedfc90
- Commit message:
- added touch for ADS7843 bound to TFT class
Changed in this revision
diff -r ae0a4eedfc90 -r 62f3bed03503 TouchADS7843/Touch.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TouchADS7843/Touch.cpp Wed May 06 16:52:07 2015 +0000
@@ -0,0 +1,290 @@
+/**************************************************************************************************
+ ***** *****
+ ***** Name: Touch.cpp *****
+ ***** Ver.: 1.0 *****
+ ***** Date: 04/01/2013 *****
+ ***** Auth: Frank Vannieuwkerke *****
+ ***** Erik Olieman *****
+ ***** Func: Touch driver for use with ADS7843 *****
+ ***** *****
+ ***** Code based on Carlos E. Vidales tutorial : *****
+ ***** How To Calibrate Touch Screens *****
+ ***** www.embedded.com/design/configurable-systems/4023968/How-To-Calibrate-Touch-Screens *****
+ ***** *****
+ **************************************************************************************************/
+
+#include "Touch.h"
+#include "mbed.h"
+#include "Arial12x12.h"
+
+#define THRESHOLD 2
+
+TouchScreenADS7843::TouchScreenADS7843(PinName tp_mosi, PinName tp_miso, PinName tp_sclk, PinName tp_cs, PinName tp_irq, TFT *_LCD)
+ : LCD(_LCD), _tp_spi(tp_mosi, tp_miso, tp_sclk), _tp_cs(tp_cs), _tp_irq(tp_irq)
+ {
+ DisplaySample[0].x=45;
+ DisplaySample[0].y=45;
+ DisplaySample[1].x=45;
+ DisplaySample[1].y=270;
+ DisplaySample[2].x=190;
+ DisplaySample[2].y=190;
+ ScreenSample[0].x=45;
+ ScreenSample[0].y=45;
+ ScreenSample[1].x=45;
+ ScreenSample[1].y=270;
+ ScreenSample[2].x=190;
+ ScreenSample[2].y=190;
+ _tp_cs=1;
+ _tp_spi.frequency(500000);
+ _tp_spi.format(8,0); // 8 bit spi mode 0
+ }
+
+int TouchScreenADS7843::Read_XY(unsigned char XY)
+{
+ unsigned char msb, lsb;
+ unsigned int Temp;
+
+ Temp=0;
+ _tp_cs=0;
+ wait_us(SPI_RD_DELAY);
+ _tp_spi.write(XY);
+ wait_us(SPI_RD_DELAY);
+ msb = _tp_spi.write(0x00); // msb
+ wait_us(SPI_RD_DELAY);
+ lsb = _tp_spi.write(0x00); // lsb
+ _tp_cs=1;
+ Temp = ((msb << 8 ) | lsb);
+ Temp >>= 3;
+ Temp &= 0xfff;
+ Temp /= 4; // Scaling : return value range must be between 0 and 1024
+ return(Temp);
+}
+
+
+void TouchScreenADS7843::TP_GetAdXY(int *x,int *y)
+{
+ int adx,ady;
+ adx = Read_XY(CHX);
+ wait_us(1);
+ ady = Read_XY(CHY);
+ *x = adx;
+ *y = ady;
+}
+
+void TouchScreenADS7843::TP_DrawPoint(unsigned int Xpos,unsigned int Ypos, unsigned int color)
+{
+// LCD->wr_reg(0x03, 0x1030);
+// LCD->WindowMax();
+ LCD->pixel(Xpos,Ypos,color);
+ LCD->pixel(Xpos+1,Ypos,color);
+ LCD->pixel(Xpos,Ypos+1,color);
+ LCD->pixel(Xpos+1,Ypos+1,color);
+}
+
+void TouchScreenADS7843::DrawCross(unsigned int Xpos,unsigned int Ypos)
+{
+// LCD->rect(Xpos-7,Ypos+7,Xpos+7,Ypos-7, Red);
+
+ LCD->line(Xpos-15,Ypos,Xpos-2,Ypos,White); //left
+ LCD->line(Xpos+2,Ypos,Xpos+15,Ypos,White);
+ LCD->line(Xpos,Ypos-15,Xpos,Ypos-2,White);
+ LCD->line(Xpos,Ypos+2,Xpos,Ypos+15,White);
+
+ LCD->line(Xpos-15,Ypos+15,Xpos-7,Ypos+15,DarkGrey);
+ LCD->line(Xpos-15,Ypos+7,Xpos-15,Ypos+15,DarkGrey);
+
+ LCD->line(Xpos-15,Ypos-15,Xpos-7,Ypos-15,DarkGrey);
+ LCD->line(Xpos-15,Ypos-7,Xpos-15,Ypos-15,DarkGrey);
+
+ LCD->line(Xpos+7,Ypos+15,Xpos+15,Ypos+15,DarkGrey);
+ LCD->line(Xpos+15,Ypos+7,Xpos+15,Ypos+15,DarkGrey);
+
+ LCD->line(Xpos+7,Ypos-15,Xpos+15,Ypos-15,DarkGrey);
+ LCD->line(Xpos+15,Ypos-15,Xpos+15,Ypos-7,DarkGrey);
+}
+
+unsigned char TouchScreenADS7843::Read_Ads7843(Coordinate * screenPtr)
+{
+ int m0,m1,m2,TP_X[1],TP_Y[1],temp[3];
+ uint8_t count=0;
+ int buffer[2][9]={{0},{0}};
+ if (screenPtr == NULL) screenPtr = &screen;
+ do
+ {
+ TP_GetAdXY(TP_X,TP_Y);
+ buffer[0][count]=TP_X[0];
+ buffer[1][count]=TP_Y[0];
+ count++;
+ }
+ while(!_tp_irq && (count < 9));
+ if(count==9)
+ {
+ temp[0]=(buffer[0][0]+buffer[0][1]+buffer[0][2])/3;
+ temp[1]=(buffer[0][3]+buffer[0][4]+buffer[0][5])/3;
+ temp[2]=(buffer[0][6]+buffer[0][7]+buffer[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>THRESHOLD) && (m1>THRESHOLD) && (m2>THRESHOLD) ) return 0;
+ if(m0<m1)
+ {
+ if(m2<m0)
+ screenPtr->x=(temp[0]+temp[2])/2;
+ else
+ screenPtr->x=(temp[0]+temp[1])/2;
+ }
+ else if(m2<m1)
+ screenPtr->x=(temp[0]+temp[2])/2;
+ else
+ screenPtr->x=(temp[1]+temp[2])/2;
+
+ temp[0]=(buffer[1][0]+buffer[1][1]+buffer[1][2])/3;
+ temp[1]=(buffer[1][3]+buffer[1][4]+buffer[1][5])/3;
+ temp[2]=(buffer[1][6]+buffer[1][7]+buffer[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>THRESHOLD) && (m1>THRESHOLD) && (m2>THRESHOLD) ) return 0;
+
+ if(m0<m1)
+ {
+ if(m2<m0)
+ screenPtr->y=(temp[0]+temp[2])/2;
+ else
+ screenPtr->y=(temp[0]+temp[1])/2;
+ }
+ else if(m2<m1)
+ screenPtr->y=(temp[0]+temp[2])/2;
+ else
+ screenPtr->y=(temp[1]+temp[2])/2;
+ return 1;
+ }
+ return 0;
+}
+
+uint8_t TouchScreenADS7843::setCalibrationMatrix( Coordinate * displayPtr,
+ Coordinate * screenPtr,
+ Matrix * matrixPtr)
+{
+ uint8_t retTHRESHOLD = 0 ;
+ // K = (Xs0 - Xs2)*(Ys1 - Ys2) - (Xs1 - Xs2)*(Ys0 - Ys2)
+ 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 )
+ {
+ retTHRESHOLD = 1;
+ }
+ else
+ {
+ // (Xd0 - Xd2)*(Ys1 - Ys2) - (Xd1 - Xd2)*(Ys0 - Ys2)
+ // A = ---------------------------------------------------
+ // K
+ 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)) ;
+ // (Xs0 - Xs2)*(Xd1 - Xd2) - (Xd0 - Xd2)*(Xs1 - Xs2)
+ // B = ---------------------------------------------------
+ // K
+ 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)) ;
+ // Ys0*(Xs2*Xd1 - Xs1*Xd2) + Ys1*(Xs0*Xd2 - Xs2*Xd0) + Ys2*(Xs1*Xd0 - Xs0*Xd1)
+ // C = ----------------------------------------------------------------------------
+ // K
+ 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 ;
+ // (Yd0 - Yd2)*(Ys1 - Ys2) - (Yd1 - Yd2)*(Ys0 - Ys2)
+ // D = ---------------------------------------------------
+ // K
+ 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)) ;
+ // (Xs0 - Xs2)*(Yd1 - Yd2) - (Yd0 - Yd2)*(Xs1 - Xs2)
+ // E = ---------------------------------------------------
+ // K
+ 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)) ;
+ // Ys0*(Xs2*Yd1 - Xs1*Yd2) + Ys1*(Xs0*Yd2 - Xs2*Yd0) + Ys2*(Xs1*Yd0 - Xs0*Yd1)
+ // F = ----------------------------------------------------------------------------
+ // K
+ 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( retTHRESHOLD ) ;
+}
+
+uint8_t TouchScreenADS7843::getDisplayPoint(void)
+{
+ uint8_t retTHRESHOLD = 0 ;
+
+ if( matrix.Divider != 0 )
+ {
+ // XD = AX+BY+C
+ display.x = ( (matrix.An * screen.x) +
+ (matrix.Bn * screen.y) +
+ matrix.Cn
+ ) / matrix.Divider ;
+ // YD = DX+EY+F
+ display.y = ( (matrix.Dn * screen.x) +
+ (matrix.En * screen.y) +
+ matrix.Fn
+ ) / matrix.Divider ;
+ }
+ else
+ {
+ retTHRESHOLD = 1;
+ }
+ return(retTHRESHOLD);
+}
+
+void TouchScreenADS7843::TouchPanel_Calibrate(void)
+{
+ uint8_t i;
+ Coordinate screen_cal;
+ setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ;
+ LCD->set_font((unsigned char*) Arial12x12);
+ for(i=0;i<3;i++)
+ {
+ LCD->cls();
+ LCD->locate(10,10);
+ LCD->printf("Touch crosshair to calibrate");
+ wait_ms(500);
+ DrawCross(DisplaySample[i].x,DisplaySample[i].y);
+ do {} while (!Read_Ads7843(&screen_cal));
+ ScreenSample[i].x= screen_cal.x;ScreenSample[i].y= screen_cal.y;
+ }
+ setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ;
+ LCD->cls();
+}
+
+void TouchScreenADS7843::GetCalibration(Matrix * matrixPtr, Coordinate * screenPtr)
+{
+ uint8_t i;
+ Matrix * mp1;
+ mp1 = &matrix;
+ *matrixPtr = *mp1;
+ for(i=0;i<3;i++)
+ {
+ screenPtr[i].x = ScreenSample[i].x;
+ screenPtr[i].y = ScreenSample[i].y;
+ }
+}
+
+void TouchScreenADS7843::SetCalibration(Matrix * matrixPtr, Coordinate * screenPtr)
+{
+ uint8_t i;
+ Matrix * mp1;
+ mp1 = &matrix;
+ *mp1 = *matrixPtr;
+ for(i=0;i<3;i++)
+ {
+ ScreenSample[i].x = screenPtr[i].x;
+ ScreenSample[i].y = screenPtr[i].y;
+ }
+ setCalibrationMatrix( &DisplaySample[0],&ScreenSample[0],&matrix) ;
+}
diff -r ae0a4eedfc90 -r 62f3bed03503 TouchADS7843/Touch.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TouchADS7843/Touch.h Wed May 06 16:52:07 2015 +0000
@@ -0,0 +1,175 @@
+/******************************************************************
+ ***** *****
+ ***** Name: Touch.h *****
+ ***** Ver.: 1.0 *****
+ ***** Date: 04/01/2013 *****
+ ***** Auth: Frank Vannieuwkerke *****
+ ***** Erik Olieman *****
+ ***** Func: Touch driver for use with ADS7843 *****
+ ***** *****
+ ******************************************************************/
+
+#ifndef MBED_Touch_H
+#define MBED_Touch_H
+
+#include "TFT.h"
+#include "mbed.h"
+
+ typedef struct
+ {
+ int x;
+ int y;
+ } Coordinate;
+
+ typedef struct
+ {
+ int An,
+ Bn,
+ Cn,
+ Dn,
+ En,
+ Fn,
+ Divider ;
+ } Matrix;
+
+class TouchScreenADS7843 {
+public:
+ Coordinate display;
+ Coordinate screen;
+
+ /*
+ * Create a Touchscreen object connected to SPI and two pins.
+ *
+ * @param mosi,miso,sclk SPI
+ * @param cs pin connected to CS of ADS7843
+ * @param irq pin connected to IRQ of ADS7843
+ * @param pointer to SPI_TFT constructor
+ *
+ */
+ TouchScreenADS7843(PinName tp_mosi, PinName tp_miso, PinName tp_sclk, PinName tp_cs, PinName tp_irq, TFT *_LCD);
+
+ /*
+ * Draw a 2 by 2 dot on the LCD screen.
+ *
+ * @param x (horizontal position)
+ * @param y (vertical position)
+ * @param color (16 bit pixel color)
+ *
+ */
+ void TP_DrawPoint(unsigned int Xpos,unsigned int Ypos,unsigned int color);
+
+ /*
+ * Obtain averaged data from ADS7846.
+ * does 9 consecutive reads and only stores averaged data
+ * when the 9 points are within the treshold limits.
+ *
+ * @param screenPTR (pointer to store data)
+ * @returns 1 on success
+ * @returns 0 on failure
+ *
+ * If called with screenPTR = NULL - 'screen' variable is used, otherwise (parameter) is used.
+ *
+ */
+ unsigned char Read_Ads7843(Coordinate * screenPtr = NULL);
+
+ /*
+ * Calibrate the touch panel.
+ * Three crosshairs are drawn and need to be touched in sequence.
+ * A calibration matrix is set accordingly.
+ *
+ */
+ void TouchPanel_Calibrate(void);
+
+ /*
+ * Obtain real x,y coordinates.
+ * The x,y coordinates are calculated using the calibration matrix.
+ *
+ */
+ unsigned char getDisplayPoint(void);
+
+ /*
+ * Read touchpanel screensample and matrix values.
+ *
+ * In your code, create 2 structures using Matrix and screenPtr
+ * and call this function with these structures.
+ * the calibration values are returned into these structures.
+ * Example:
+ * Matrix matrix;
+ * Coordinate ScreenSample[3];
+ * GetCalibration(&matrix, &ScreenSample[0]);
+ */
+ void GetCalibration(Matrix * matrixPtr, Coordinate * screenPtr);
+
+ /*
+ * Set touchpanel calibration using screensample and matrix values.
+ *
+ * In your code, create 2 structures based on Matrix and screenPtr,
+ * copy saved calibration values into these structures
+ * and call this function with these structures.
+ * Example:
+ * Matrix matrix;
+ * Coordinate ScreenSample[3];
+ * <pseudocode> load matrix with values from external storage (eg eeprom).
+ * <pseudocode> load ScreenSample with values from external storage (eg eeprom).
+ * SetCalibration(&matrix, &ScreenSample[0]);
+ */
+ void SetCalibration(Matrix * matrixPtr, Coordinate * screenPtr);
+
+ TFT *LCD;
+ SPI _tp_spi;
+ DigitalOut _tp_cs;
+ DigitalIn _tp_irq;
+
+protected:
+
+ #define SPI_RD_DELAY 1
+ #define CHX 0xd0 // 12 bit mode
+ #define CHY 0x90
+
+ Coordinate DisplaySample[3];
+ Coordinate ScreenSample[3];
+ Matrix matrix;
+
+ /*
+ * Obtain raw x,y data from ADS7846
+ *
+ * @param pointer to raw x and y coordinates (pointer to store data)
+ * @returns x (horizontal position)
+ * @returns y (vertical position)
+ *
+ */
+ void TP_GetAdXY(int *x,int *y);
+
+ /*
+ * Obtain raw single channel data from ADS7846 (Called by TP_GetADXY)
+ *
+ * @param channel to be read (CHX or CHY)
+ * @returns raw scaled down value (return value range must be between 0 and 1024)
+ *
+ */
+ int Read_XY(unsigned char XY);
+
+ /*
+ * Draw a calibration crosshair on the LCD screen
+ *
+ * @param x (horizontal position)
+ * @param y (vertical position)
+ *
+ */
+ void DrawCross(unsigned int Xpos,unsigned int Ypos);
+
+ /*
+ * Set the calibration matrix
+ *
+ * @param displayPTR (pointer to display data)
+ * @param screenPTR (pointer to screen data)
+ * @param matrixPTR (pointer to calibration matrix)
+ *
+ * @returns 0 when matrix.divider != 0
+ * @returns 1 when matrix.divider = 0
+ *
+ */
+ unsigned char setCalibrationMatrix( Coordinate * displayPtr,Coordinate * screenPtr,Matrix * matrixPtr);
+
+};
+#endif
diff -r ae0a4eedfc90 -r 62f3bed03503 TouchADS7843/readme.txt
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/TouchADS7843/readme.txt Wed May 06 16:52:07 2015 +0000
@@ -0,0 +1,40 @@
+#include "mbed.h"
+#include "ILI9341.h"
+#include "Touch.h"
+
+ILI9341 TFT(SPI_16, 12000000, D11, D12, D13, D10, D9, D8, "TFT"); // Spi 16bit, 12MHz, mosi, miso, sclk, cs, reset, dc
+
+TouchScreenADS7843 TP(D11, D12, D13, D14, D15, &TFT); // ADS7843 -> mosi, miso, sclk, cs, irq, SPI_TFT
+
+int main()
+{
+ TFT.claim(stdout);
+ Matrix matrix;
+ Coordinate ScreenSample[3];
+ TP.TouchPanel_Calibrate();
+ TP.GetCalibration(&matrix, &ScreenSample[0]);
+ TP.SetCalibration(&matrix, &ScreenSample[0]);
+ for(;;) {
+
+ if (!TP._tp_irq) {
+ if (TP.Read_Ads7843()) {
+ TP.getDisplayPoint() ;
+ TP.TP_DrawPoint(TP.display.x,TP.display.y, Blue);
+ TFT.locate(25,0);
+ printf("%03d",TP.display.x);
+ TFT.locate(95,0);
+ printf("%03d",TP.display.y);
+ // Touchscreen area is larger than LCD area.
+ // We use the bottom area outside the LCD area to clear the screen (y value > 320).
+ if (TP.display.y > 320) {
+ TFT.cls();
+ TFT.locate(0,0);
+ printf(" X:");
+ TFT.locate(70,0);
+ printf(" Y:");
+ }
+ }
+ }
+
+ }
+}
\ No newline at end of file