Components / SeeedStudioTFTv2

Library for SeeedStudioTFTv2 2.8 Zoll 240x360 pixel touch SD card

Dependencies:   SPI_TFT_ILI9341

Dependents:   Seeed_TFT_Touch_Shield Seeed_TFT_Touch_Shield Adafruit_TFT_Touch_Shield UIT2_SpectrumAnalyzer ... more

Fork of SeeedStudioTFTv2 by Michael Ammann

SeeedStudioTFTv2.cpp@4:4542d1ff81e4, 2013-10-19 (annotated)

Committer:
mazgch
Date:
Sat Oct 19 20:51:48 2013 +0000
Revision:
4:4542d1ff81e4
Child:
5:366bdc7a8315
SeeedStudioTFTv2 shield with Touch support

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mazgch 4:4542d1ff81e4 1 /* mbed library for resistive touch pads
mazgch 4:4542d1ff81e4 2 * uses 4 pins - 2 IO and 2 Analog
mazgch 4:4542d1ff81e4 3
mazgch 4:4542d1ff81e4 4 * c 2011 Peter Drescher - DC2PD
mazgch 4:4542d1ff81e4 5 *
mazgch 4:4542d1ff81e4 6 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
mazgch 4:4542d1ff81e4 7 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
mazgch 4:4542d1ff81e4 8 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
mazgch 4:4542d1ff81e4 9 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
mazgch 4:4542d1ff81e4 10 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
mazgch 4:4542d1ff81e4 11 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
mazgch 4:4542d1ff81e4 12 * THE SOFTWARE.
mazgch 4:4542d1ff81e4 13 */
mazgch 4:4542d1ff81e4 14
mazgch 4:4542d1ff81e4 15
mazgch 4:4542d1ff81e4 16 #include "mbed.h"
mazgch 4:4542d1ff81e4 17 #include "SeeedStudioTFTv2.h"
mazgch 4:4542d1ff81e4 18
mazgch 4:4542d1ff81e4 19 SeeedStudioTFTv2::SeeedStudioTFTv2(PinName xp, PinName xm, PinName yp, PinName ym,
mazgch 4:4542d1ff81e4 20 PinName mosi, PinName miso, PinName sclk,
mazgch 4:4542d1ff81e4 21 PinName csTft, PinName rstTft, PinName dcTft, PinName blTft,
mazgch 4:4542d1ff81e4 22 PinName csSd):
mazgch 4:4542d1ff81e4 23 SPI_TFT_ILI9341(mosi,miso,sclk,csTft,rstTft,dcTft, "tft")
mazgch 4:4542d1ff81e4 24 #ifdef USE_SDCARD
mazgch 4:4542d1ff81e4 25 ,SDFileSystem(mosi,miso,sclk,csSd, "sdc")
mazgch 4:4542d1ff81e4 26 #endif
mazgch 4:4542d1ff81e4 27 {
mazgch 4:4542d1ff81e4 28 #ifndef USE_SDCARD
mazgch 4:4542d1ff81e4 29 // sd card
mazgch 4:4542d1ff81e4 30 DigitalOut cs(csSd);
mazgch 4:4542d1ff81e4 31 cs = 1;
mazgch 4:4542d1ff81e4 32 #endif
mazgch 4:4542d1ff81e4 33 // backlight
mazgch 4:4542d1ff81e4 34 DigitalOut bl(blTft);
mazgch 4:4542d1ff81e4 35 bl = 1;
mazgch 4:4542d1ff81e4 36 // touch screen pins
mazgch 4:4542d1ff81e4 37 _xp = xp;
mazgch 4:4542d1ff81e4 38 _yp = yp;
mazgch 4:4542d1ff81e4 39 _xm = xm;
mazgch 4:4542d1ff81e4 40 _ym = ym;
mazgch 4:4542d1ff81e4 41 // default touch calibration
mazgch 4:4542d1ff81e4 42 // orientation // 0 1 2 3
mazgch 4:4542d1ff81e4 43 x_off = 108000; // 17252 16605 108755 108000
mazgch 4:4542d1ff81e4 44 y_off = 22000; // 22330 105819 97167 22000
mazgch 4:4542d1ff81e4 45 pp_tx = -291; // 378 289 -390 -291
mazgch 4:4542d1ff81e4 46 pp_ty = 356; // 261 -355 -239 356
mazgch 4:4542d1ff81e4 47 }
mazgch 4:4542d1ff81e4 48
mazgch 4:4542d1ff81e4 49 int SeeedStudioTFTv2::readTouch(PinName p, PinName m, PinName a, PinName i)
mazgch 4:4542d1ff81e4 50 {
mazgch 4:4542d1ff81e4 51 DigitalOut _p(p);
mazgch 4:4542d1ff81e4 52 _p = 1;
mazgch 4:4542d1ff81e4 53 DigitalOut _m(m);
mazgch 4:4542d1ff81e4 54 _m = 0;
mazgch 4:4542d1ff81e4 55 AnalogIn _a(a);
mazgch 4:4542d1ff81e4 56 DigitalIn _i(i);
mazgch 4:4542d1ff81e4 57 wait_us(10);
mazgch 4:4542d1ff81e4 58 return _a.read_u16();
mazgch 4:4542d1ff81e4 59 }
mazgch 4:4542d1ff81e4 60
mazgch 4:4542d1ff81e4 61 SeeedStudioTFTv2::TOUCH SeeedStudioTFTv2::getTouch(point& p)
mazgch 4:4542d1ff81e4 62 {
mazgch 4:4542d1ff81e4 63 int y2 = readTouch(_xp,_xm,_yp,_ym);
mazgch 4:4542d1ff81e4 64 int x2 = readTouch(_yp,_ym,_xp,_xm);
mazgch 4:4542d1ff81e4 65 int y1 = readTouch(_xp,_xm,_yp,_ym);
mazgch 4:4542d1ff81e4 66 int x1 = readTouch(_yp,_ym,_xp,_xm);
mazgch 4:4542d1ff81e4 67 int xd = x1 - x2;
mazgch 4:4542d1ff81e4 68 int yd = y1 - y2;
mazgch 4:4542d1ff81e4 69 xd = (xd > 0) ? xd : -xd;
mazgch 4:4542d1ff81e4 70 yd = (yd > 0) ? xd : -xd;
mazgch 4:4542d1ff81e4 71 p.x = x1 + x2;
mazgch 4:4542d1ff81e4 72 p.y = y1 + y2;
mazgch 4:4542d1ff81e4 73 #if 0
mazgch 4:4542d1ff81e4 74 DigitalOut _p(_xp);
mazgch 4:4542d1ff81e4 75 _p = 1;
mazgch 4:4542d1ff81e4 76 DigitalOut _m(_ym);
mazgch 4:4542d1ff81e4 77 _m = 0;
mazgch 4:4542d1ff81e4 78 AnalogIn _ax(_xm);
mazgch 4:4542d1ff81e4 79 AnalogIn _ay(_yp);
mazgch 4:4542d1ff81e4 80 wait_us(20);
mazgch 4:4542d1ff81e4 81 int ax = _ax.read_u16();
mazgch 4:4542d1ff81e4 82 int ay = _ay.read_u16();
mazgch 4:4542d1ff81e4 83 float z = 0;
mazgch 4:4542d1ff81e4 84 z = (float)ay / ax / x / 2 * 0x10000;
mazgch 4:4542d1ff81e4 85 #endif
mazgch 4:4542d1ff81e4 86 const int th = 8000;
mazgch 4:4542d1ff81e4 87 const int df = 100;
mazgch 4:4542d1ff81e4 88 TOUCH touch;
mazgch 4:4542d1ff81e4 89 if (x1 < th || x2 < th ||
mazgch 4:4542d1ff81e4 90 y1 < th || y2 < th) {
mazgch 4:4542d1ff81e4 91 p.x = 0;
mazgch 4:4542d1ff81e4 92 p.y = 0;
mazgch 4:4542d1ff81e4 93 touch = NO;
mazgch 4:4542d1ff81e4 94 } else if (xd > df || yd > df) {
mazgch 4:4542d1ff81e4 95 touch = MAYBE;
mazgch 4:4542d1ff81e4 96 } else {
mazgch 4:4542d1ff81e4 97 touch = YES;
mazgch 4:4542d1ff81e4 98 }
mazgch 4:4542d1ff81e4 99 //locate(0,50);
mazgch 4:4542d1ff81e4 100 //printf("x: %6i y: %6i",p.x,p.y);
mazgch 4:4542d1ff81e4 101 return touch;
mazgch 4:4542d1ff81e4 102 }
mazgch 4:4542d1ff81e4 103
mazgch 4:4542d1ff81e4 104 void SeeedStudioTFTv2::calibrate(void)
mazgch 4:4542d1ff81e4 105 {
mazgch 4:4542d1ff81e4 106 int i;
mazgch 4:4542d1ff81e4 107 int a = 0,b = 0,c = 0, d = 0;
mazgch 4:4542d1ff81e4 108 int pos_x, pos_y;
mazgch 4:4542d1ff81e4 109 point p;
mazgch 4:4542d1ff81e4 110
mazgch 4:4542d1ff81e4 111 cls();
mazgch 4:4542d1ff81e4 112 foreground(White); // set chars to white
mazgch 4:4542d1ff81e4 113 line(0,3,6,3,White);
mazgch 4:4542d1ff81e4 114 line(3,0,3,6,White);
mazgch 4:4542d1ff81e4 115 // get the center of the screen
mazgch 4:4542d1ff81e4 116 pos_x = columns() / 2 - 3;
mazgch 4:4542d1ff81e4 117 pos_x = pos_x * font[1];
mazgch 4:4542d1ff81e4 118 pos_y = (rows() / 2) - 1;
mazgch 4:4542d1ff81e4 119 pos_y = pos_y * font[2];
mazgch 4:4542d1ff81e4 120 locate(pos_x,pos_y);
mazgch 4:4542d1ff81e4 121 printf("press cross ");
mazgch 4:4542d1ff81e4 122 locate(pos_x,pos_y + font[2]);
mazgch 4:4542d1ff81e4 123 printf("to calibrate ");
mazgch 4:4542d1ff81e4 124 for (i=0; i<5; i++) {
mazgch 4:4542d1ff81e4 125 while (getTouch(p) != YES)
mazgch 4:4542d1ff81e4 126 /*nothing*/;
mazgch 4:4542d1ff81e4 127 a += p.x;
mazgch 4:4542d1ff81e4 128 b += p.y;
mazgch 4:4542d1ff81e4 129 }
mazgch 4:4542d1ff81e4 130 a = a / 5;
mazgch 4:4542d1ff81e4 131 b = b / 5;
mazgch 4:4542d1ff81e4 132 locate(pos_x,pos_y);
mazgch 4:4542d1ff81e4 133 printf("ok ");
mazgch 4:4542d1ff81e4 134 locate(pos_x,pos_y + font[2]);
mazgch 4:4542d1ff81e4 135 printf("release touch ");
mazgch 4:4542d1ff81e4 136 while (getTouch(p) != NO)
mazgch 4:4542d1ff81e4 137 /*nothing*/;
mazgch 4:4542d1ff81e4 138 cls();
mazgch 4:4542d1ff81e4 139 line(width() -5, height() - 8,width() - 5,height() -1,White); // paint cross
mazgch 4:4542d1ff81e4 140 line(width() - 8,height() - 5,width() - 1,height() - 5,White);
mazgch 4:4542d1ff81e4 141 locate(pos_x,pos_y);
mazgch 4:4542d1ff81e4 142 printf("press cross ");
mazgch 4:4542d1ff81e4 143 locate(pos_x,pos_y + font[2]);
mazgch 4:4542d1ff81e4 144 printf("to calibrate ");
mazgch 4:4542d1ff81e4 145 for (i=0; i<5; i++) {
mazgch 4:4542d1ff81e4 146 while (getTouch(p) != YES)
mazgch 4:4542d1ff81e4 147 /*nothing*/;
mazgch 4:4542d1ff81e4 148 c+= p.x;
mazgch 4:4542d1ff81e4 149 d+= p.y;
mazgch 4:4542d1ff81e4 150 }
mazgch 4:4542d1ff81e4 151 c = c / 5;
mazgch 4:4542d1ff81e4 152 d = d / 5;
mazgch 4:4542d1ff81e4 153 locate(pos_x, pos_y);
mazgch 4:4542d1ff81e4 154
mazgch 4:4542d1ff81e4 155 x_off = a;
mazgch 4:4542d1ff81e4 156 y_off = b;
mazgch 4:4542d1ff81e4 157 i = c-a; // delta x
mazgch 4:4542d1ff81e4 158 pp_tx = i / (width() - 6);
mazgch 4:4542d1ff81e4 159 i = d-b; // delta y
mazgch 4:4542d1ff81e4 160 pp_ty = i / (height() - 6);
mazgch 4:4542d1ff81e4 161
mazgch 4:4542d1ff81e4 162 locate(pos_x,pos_y);
mazgch 4:4542d1ff81e4 163 printf("Calibrated ");
mazgch 4:4542d1ff81e4 164 locate(pos_x,pos_y + font[2]);
mazgch 4:4542d1ff81e4 165 printf("x %6i %4i", x_off, pp_tx);
mazgch 4:4542d1ff81e4 166 locate(pos_x,pos_y + 2*font[2]);
mazgch 4:4542d1ff81e4 167 printf("y %6i %4i", y_off, pp_ty);
mazgch 4:4542d1ff81e4 168 while (getTouch(p) != NO)
mazgch 4:4542d1ff81e4 169 /*nothing*/;
mazgch 4:4542d1ff81e4 170 cls();
mazgch 4:4542d1ff81e4 171 }
mazgch 4:4542d1ff81e4 172
mazgch 4:4542d1ff81e4 173 point SeeedStudioTFTv2::toPixel(point p)
mazgch 4:4542d1ff81e4 174 {
mazgch 4:4542d1ff81e4 175 p.x -= x_off;
mazgch 4:4542d1ff81e4 176 p.x /= pp_tx;
mazgch 4:4542d1ff81e4 177 int w = width();
mazgch 4:4542d1ff81e4 178 if (p.x > w) p.x = w;
mazgch 4:4542d1ff81e4 179 if (p.x < 0) p.x = 0;
mazgch 4:4542d1ff81e4 180 p.y -= y_off;
mazgch 4:4542d1ff81e4 181 p.y /= pp_ty;
mazgch 4:4542d1ff81e4 182 int h = height();
mazgch 4:4542d1ff81e4 183 if (p.y > h) p.y = h;
mazgch 4:4542d1ff81e4 184 if (p.y < 0) p.y = 0;
mazgch 4:4542d1ff81e4 185 return (p);
mazgch 4:4542d1ff81e4 186 }
mazgch 4:4542d1ff81e4 187
mazgch 4:4542d1ff81e4 188 bool SeeedStudioTFTv2::getPixel(point& p)
mazgch 4:4542d1ff81e4 189 {
mazgch 4:4542d1ff81e4 190 TOUCH touch = getTouch(p);
mazgch 4:4542d1ff81e4 191 p = toPixel(p);
mazgch 4:4542d1ff81e4 192 return touch == YES;
mazgch 4:4542d1ff81e4 193 }