Diff: TouchADS7843/Touch.h

Revision:

0:ff976ad09b2f

Child:

1:76f92f6b3737

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TouchADS7843/Touch.h	Tue Mar 18 19:36:05 2014 +0000
@@ -0,0 +1,147 @@
+/******************************************************************
+ *****                                                        *****
+ *****  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 "SPI_TFT_ILI9320.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, SPI_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);
+
+    SPI_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