Henry Leinen / Touch_tft

LIB for resistiv touchscreen connected to 4 mbed pins Use SPI_TFT lib

Fork of Touch_tft by Peter Drescher

touch_tft.h@4:330f2f16dabb, 2013-06-26 (annotated)

Committer:
leihen
Date:
Wed Jun 26 21:55:37 2013 +0000
Revision:
4:330f2f16dabb
Parent:
3:1c2df48aa2eb 
No Change

Who changed what in which revision?

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dreschpe 1:1745fdf054b5 1 /* mbed library for touchscreen connected to 4 mbed pins
dreschpe 1:1745fdf054b5 2 * derive from SPI_TFT lib
dreschpe 1:1745fdf054b5 3 * Copyright (c) 2011 Peter Drescher - DC2PD
dreschpe 1:1745fdf054b5 4 *
dreschpe 1:1745fdf054b5 5 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dreschpe 1:1745fdf054b5 6 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dreschpe 1:1745fdf054b5 7 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
dreschpe 1:1745fdf054b5 8 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dreschpe 1:1745fdf054b5 9 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
dreschpe 1:1745fdf054b5 10 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
dreschpe 1:1745fdf054b5 11 * THE SOFTWARE.
dreschpe 1:1745fdf054b5 12 */
dreschpe 1:1745fdf054b5 13
dreschpe 0:d78b00f167cb 14 #ifndef MBED_TOUCH_H
dreschpe 0:d78b00f167cb 15 #define MBED_TOUCH_H
dreschpe 0:d78b00f167cb 16
dreschpe 0:d78b00f167cb 17 #include "mbed.h"
dreschpe 0:d78b00f167cb 18 #include "SPI_TFT.h"
dreschpe 0:d78b00f167cb 19
dreschpe 0:d78b00f167cb 20 struct point{
dreschpe 0:d78b00f167cb 21 unsigned short x;
dreschpe 0:d78b00f167cb 22 unsigned short y;
dreschpe 0:d78b00f167cb 23 };
dreschpe 0:d78b00f167cb 24
dreschpe 1:1745fdf054b5 25
dreschpe 1:1745fdf054b5 26 /** touchscreen control class, based on SPI_TFT
dreschpe 1:1745fdf054b5 27 *
dreschpe 1:1745fdf054b5 28 * Example:
dreschpe 1:1745fdf054b5 29 * @code
dreschpe 1:1745fdf054b5 30 *
dreschpe 1:1745fdf054b5 31 * #include "mbed.h"
dreschpe 1:1745fdf054b5 32 * #include "SPI_TFT.h"
dreschpe 1:1745fdf054b5 33 * #include "Arial12x12.h"
dreschpe 1:1745fdf054b5 34 * #include "Arial28x28.h"
dreschpe 1:1745fdf054b5 35 * #include "touch_tft.h"
dreschpe 1:1745fdf054b5 36 * // the TFT is connected to SPI pin 5-7
dreschpe 1:1745fdf054b5 37 * // the touch is connected to 19,20,16,17
dreschpe 1:1745fdf054b5 38 *
dreschpe 1:1745fdf054b5 39 * touch_tft tt(p19,p20,p16,p17,p5, p6, p7, p8, p15,"TFT"); // x+,x-,y+,y-,mosi, miso, sclk, cs, reset
dreschpe 1:1745fdf054b5 40 *
dreschpe 1:1745fdf054b5 41 * int main() {
dreschpe 1:1745fdf054b5 42 * point p;
dreschpe 1:1745fdf054b5 43 *
dreschpe 1:1745fdf054b5 44 * tt.claim(stdout); // send stdout to the TFT display
dreschpe 1:1745fdf054b5 45 * tt.background(Black); // set background to black
dreschpe 1:1745fdf054b5 46 * tt.foreground(White); // set chars to white
dreschpe 1:1745fdf054b5 47 * tt.cls(); // clear the screen
dreschpe 1:1745fdf054b5 48 * tt.set_font((unsigned char*) Arial12x12); // select the font
dreschpe 1:1745fdf054b5 49 * tt.set_orientation(1);
dreschpe 1:1745fdf054b5 50 *
dreschpe 1:1745fdf054b5 51 * tt.calibrate(); // calibrate the touch
dreschpe 1:1745fdf054b5 52 * while (1) {
dreschpe 1:1745fdf054b5 53 * p = tt.get_touch(); // read analog pos.
dreschpe 1:1745fdf054b5 54 * if (tt.is_touched(p)) { // test if touched
dreschpe 1:1745fdf054b5 55 * p = tt.to_pixel(p); // convert to pixel pos
dreschpe 1:1745fdf054b5 56 * tt.fillcircle(p.x,p.y,3,Blue); // print a blue dot on the screen
dreschpe 1:1745fdf054b5 57 * }
dreschpe 1:1745fdf054b5 58 * }
dreschpe 1:1745fdf054b5 59 * @endcode
dreschpe 1:1745fdf054b5 60 */
dreschpe 0:d78b00f167cb 61 class touch_tft : public SPI_TFT{
dreschpe 0:d78b00f167cb 62 public:
dreschpe 1:1745fdf054b5 63 /** create a TFT with touch object connected to the pins:
dreschpe 0:d78b00f167cb 64 *
dreschpe 0:d78b00f167cb 65 * @param pin xp resistiv touch x+
dreschpe 0:d78b00f167cb 66 * @param pin xm resistiv touch x-
dreschpe 0:d78b00f167cb 67 * @param pin yp resistiv touch y+
dreschpe 0:d78b00f167cb 68 * @param pin ym resistiv touch y-
dreschpe 0:d78b00f167cb 69 * @param mosi,miso,sclk SPI connection to TFT
dreschpe 0:d78b00f167cb 70 * @param cs pin connected to CS of display
dreschpe 0:d78b00f167cb 71 * @param reset pin connected to RESET of display
dreschpe 0:d78b00f167cb 72 * based on my SPI_TFT lib
dreschpe 0:d78b00f167cb 73 */
dreschpe 0:d78b00f167cb 74 touch_tft(PinName xp, PinName xm, PinName yp, PinName ym,PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset,const char* name ="TFT");
dreschpe 0:d78b00f167cb 75
dreschpe 0:d78b00f167cb 76 /** calibrate the touch display
dreschpe 0:d78b00f167cb 77 *
dreschpe 1:1745fdf054b5 78 * User is asked to touch on two points on the screen
dreschpe 0:d78b00f167cb 79 */
dreschpe 0:d78b00f167cb 80 void calibrate(void);
dreschpe 0:d78b00f167cb 81
dreschpe 0:d78b00f167cb 82 /** read x and y analog samples
dreschpe 0:d78b00f167cb 83 *
dreschpe 0:d78b00f167cb 84 * @returns point(x,y)
dreschpe 0:d78b00f167cb 85 */
dreschpe 0:d78b00f167cb 86 point get_touch(void);
dreschpe 0:d78b00f167cb 87
dreschpe 0:d78b00f167cb 88 /** calculate coord on screen
dreschpe 0:d78b00f167cb 89 *
dreschpe 0:d78b00f167cb 90 * @param a_point point(analog x, analog y)
dreschpe 0:d78b00f167cb 91 * @returns point(pixel x, pixel y)
dreschpe 0:d78b00f167cb 92 *
dreschpe 0:d78b00f167cb 93 */
dreschpe 0:d78b00f167cb 94 point to_pixel(point a_point);
dreschpe 0:d78b00f167cb 95
dreschpe 0:d78b00f167cb 96 /** test if screen is touched
dreschpe 0:d78b00f167cb 97 *
dreschpe 0:d78b00f167cb 98 * @param point analog x,y
dreschpe 0:d78b00f167cb 99 * @returns true is touched
dreschpe 0:d78b00f167cb 100 *
dreschpe 0:d78b00f167cb 101 */
dreschpe 0:d78b00f167cb 102 bool is_touched(point a);
dreschpe 0:d78b00f167cb 103
leihen 3:1c2df48aa2eb 104 void printf(const char* txt) { while(*txt) { _putc(*txt++); } }
leihen 3:1c2df48aa2eb 105
dreschpe 0:d78b00f167cb 106 protected:
dreschpe 0:d78b00f167cb 107 DigitalInOut _xp;
dreschpe 0:d78b00f167cb 108 DigitalInOut _xm;
dreschpe 0:d78b00f167cb 109 DigitalInOut _yp;
dreschpe 0:d78b00f167cb 110 DigitalInOut _ym;
dreschpe 0:d78b00f167cb 111 AnalogIn _ax;
dreschpe 0:d78b00f167cb 112 AnalogIn _ay;
leihen 3:1c2df48aa2eb 113 PinName xa, xb;
leihen 3:1c2df48aa2eb 114 PinName ya, yb;
dreschpe 0:d78b00f167cb 115
dreschpe 0:d78b00f167cb 116
dreschpe 0:d78b00f167cb 117 unsigned short x_a,y_a;
dreschpe 0:d78b00f167cb 118 unsigned short x_off,y_off;
dreschpe 0:d78b00f167cb 119 unsigned short pp_tx,pp_ty;
dreschpe 0:d78b00f167cb 120
dreschpe 0:d78b00f167cb 121
dreschpe 0:d78b00f167cb 122
dreschpe 0:d78b00f167cb 123 };
dreschpe 0:d78b00f167cb 124
dreschpe 0:d78b00f167cb 125 #endif