Modified copy of Peter Dresche lib using fewer analogue pins for touch panel
Diff: touch_tft.h
- Revision:
- 0:ab6e91032412
--- /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 \ No newline at end of file