Diff: touch_tft.h

Revision:

0:ab6e91032412

diff -r 000000000000 -r ab6e91032412 touch_tft.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/touch_tft.h	Sat Aug 11 15:30:10 2012 +0000
@@ -0,0 +1,124 @@
+/* mbed library for touchscreen connected to 4 mbed pins
+ * derive from SPI_TFT lib 
+ * Copyright (c) 2011 Peter Drescher - DC2PD
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MBED_TOUCH_H
+#define MBED_TOUCH_H
+
+#include "mbed.h"
+#include "SPI_TFT.h"
+
+struct point{
+       unsigned short x;
+       unsigned short y;
+       };
+
+
+/** touchscreen control class, based on SPI_TFT
+ *
+ * Example:
+ * @code
+ * 
+ * #include "mbed.h"
+ * #include "SPI_TFT.h"
+ * #include "Arial12x12.h"
+ * #include "Arial28x28.h"
+ * #include "touch_tft.h"
+ * // the TFT is connected to SPI pin 5-7
+ * // the touch is connected to 19,20,16,17
+ *
+ * touch_tft tt(p19,p20,p16,p17,p5, p6, p7, p8, p15,"TFT"); // x+,x-,y+,y-,mosi, miso, sclk, cs, reset
+ *
+ * int main() {
+ * point p;
+ *
+ *  tt.claim(stdout);        // send stdout to the TFT display
+ *  tt.background(Black);    // set background to black
+ *  tt.foreground(White);    // set chars to white
+ *  tt.cls();                // clear the screen
+ *  tt.set_font((unsigned char*) Arial12x12);  // select the font
+ *  tt.set_orientation(1);
+ *
+ *  tt.calibrate();          // calibrate the touch
+ * while (1) {
+ *       p = tt.get_touch();   // read analog pos.
+ *       if (tt.is_touched(p)) {  // test if touched
+ *           p = tt.to_pixel(p);             // convert to pixel pos
+ *           tt.fillcircle(p.x,p.y,3,Blue);  // print a blue dot on the screen
+ *     }
+ * }
+ * @endcode
+ */
+class touch_tft : public  SPI_TFT{
+public:
+    /** create a TFT with touch object connected to the pins:
+     *
+     * @param pin xp resistiv touch x+
+     * @param pin xm resistiv touch x-
+     * @param pin yp resistiv touch y+
+     * @param pin ym resistiv touch y-
+     * @param mosi,miso,sclk SPI connection to TFT
+     * @param cs pin connected to CS of display
+     * @param reset pin connected to RESET of display 
+     * based on my SPI_TFT lib
+     */
+    touch_tft(PinName xp, PinName xm, PinName yp, PinName ym,PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset,const char* name ="TFT");
+    
+    /** calibrate the touch display
+     *
+     * User is asked to touch on two points on the screen
+     */   
+    void calibrate(void);
+    void noncalibrate(void);
+    
+    /** read x and y analog samples
+     *
+     * @returns point(x,y)
+     */
+    point get_touch(void);
+    
+    /** calculate coord on screen
+     *
+     * @param a_point point(analog x, analog y)
+     * @returns point(pixel x, pixel y)
+     *
+     */
+    point to_pixel(point a_point);
+    
+    /** test if screen is touched
+     * 
+     * @param point analog x,y
+     * @returns true is touched
+     *
+     */   
+    bool is_touched(point a);    
+    
+protected:
+    DigitalInOut _xp;
+    DigitalInOut _xm;
+    DigitalInOut _yp;
+    DigitalInOut _ym;
+    AnalogIn     _ax;
+    AnalogIn     _ay;
+    PinName xa;
+    PinName ya;
+    
+    
+    unsigned short x_a,y_a;
+    unsigned short x_off,y_off;
+    unsigned short pp_tx,pp_ty;
+    
+    
+           
+    };
+
+#endif
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