Veikko Kero / Touch_tft

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Dependents:   MIDI_Interface_ver_1

Fork of Touch_tft by Peter Drescher

touch_tft.cpp@4:cef5cdc775ea, 2014-01-16 (annotated)

Committer:
Vekotin
Date:
Thu Jan 16 13:05:42 2014 +0000
Revision:
4:cef5cdc775ea
Parent:
3:ef67f9068850 
16.1.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 0:d78b00f167cb 1 /* mbed library for resistive touch pads
dreschpe 0:d78b00f167cb 2 * uses 4 pins - 2 IO and 2 Analog
dreschpe 0:d78b00f167cb 3
dreschpe 0:d78b00f167cb 4 * c 2011 Peter Drescher - DC2PD
dreschpe 0:d78b00f167cb 5 *
dreschpe 0:d78b00f167cb 6 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
dreschpe 0:d78b00f167cb 7 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
dreschpe 0:d78b00f167cb 8 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
dreschpe 0:d78b00f167cb 9 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
dreschpe 0:d78b00f167cb 10 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
dreschpe 0:d78b00f167cb 11 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
dreschpe 0:d78b00f167cb 12 * THE SOFTWARE.
dreschpe 0:d78b00f167cb 13 */
dreschpe 0:d78b00f167cb 14
dreschpe 0:d78b00f167cb 15
dreschpe 0:d78b00f167cb 16 #include "touch_tft.h"
dreschpe 0:d78b00f167cb 17 #include "mbed.h"
dreschpe 0:d78b00f167cb 18
dreschpe 0:d78b00f167cb 19 #define threshold 0x2000 // threshold to detect pressed
dreschpe 0:d78b00f167cb 20
dreschpe 0:d78b00f167cb 21 touch_tft::touch_tft(PinName xp, PinName xm, PinName yp, PinName ym,
Vekotin 3:ef67f9068850 22 PinName mosi, PinName miso, PinName sclk, PinName cs, PinName reset, PinName dc, const char* name):
dreschpe 0:d78b00f167cb 23 _xp(xp),_xm(xm),_yp(yp),_ym(ym),_ax(xp),_ay(yp),
Vekotin 3:ef67f9068850 24 SPI_TFT_ILI9341(mosi,miso,sclk,cs,reset,dc,name) {
dreschpe 0:d78b00f167cb 25 xa = xp;
Vekotin 3:ef67f9068850 26 ya = yp; }
dreschpe 0:d78b00f167cb 27
dreschpe 0:d78b00f167cb 28
dreschpe 0:d78b00f167cb 29 point touch_tft::get_touch() {
dreschpe 0:d78b00f167cb 30 unsigned short x1 = 0,x2 = 0, y1 = 0, y2 = 0;
dreschpe 0:d78b00f167cb 31 unsigned int s1 = 0,s2 = 0,d1 , d2;
dreschpe 0:d78b00f167cb 32 point p;
dreschpe 0:d78b00f167cb 33
dreschpe 0:d78b00f167cb 34 do {
dreschpe 0:d78b00f167cb 35 // read y voltage
dreschpe 0:d78b00f167cb 36 _xp.output();
dreschpe 0:d78b00f167cb 37 _xm.output();
dreschpe 0:d78b00f167cb 38 switch (orientation) {
dreschpe 0:d78b00f167cb 39 case(0):
dreschpe 0:d78b00f167cb 40 case(3):
dreschpe 0:d78b00f167cb 41 _xp = 1;
dreschpe 0:d78b00f167cb 42 _xm = 0;
dreschpe 0:d78b00f167cb 43 break;
dreschpe 0:d78b00f167cb 44 case(1):
dreschpe 0:d78b00f167cb 45 case(2):
dreschpe 0:d78b00f167cb 46 _xp = 0;
dreschpe 0:d78b00f167cb 47 _xm = 1;
dreschpe 0:d78b00f167cb 48 break;
dreschpe 0:d78b00f167cb 49 }
dreschpe 0:d78b00f167cb 50 _ym.input(); // y- have to be passive
dreschpe 0:d78b00f167cb 51 AnalogIn Ay(ya); // we have to call the constructor to switch to analog mode
dreschpe 0:d78b00f167cb 52 wait_us(10);
dreschpe 0:d78b00f167cb 53 y1 = Ay.read_u16(); // get y voltage
dreschpe 0:d78b00f167cb 54 d1 = (y1 > y2)? (y1-y2) : (y2-y1);
dreschpe 0:d78b00f167cb 55 if (((y1 < 8000) && (d1 < 2000)) || ((y1 > 8000) && (d1 < 150))) s1 ++;
dreschpe 0:d78b00f167cb 56 else {
dreschpe 0:d78b00f167cb 57 if (s1 > 0) s1 --;
dreschpe 0:d78b00f167cb 58 }
dreschpe 0:d78b00f167cb 59 y2 = y1;
dreschpe 0:d78b00f167cb 60 // debug
dreschpe 0:d78b00f167cb 61 //locate(1,7);
dreschpe 0:d78b00f167cb 62 //printf("d: %4d y: %5d s1: %4d",d1,y1,s1);
dreschpe 0:d78b00f167cb 63
dreschpe 0:d78b00f167cb 64 // read x voltage
dreschpe 0:d78b00f167cb 65 _yp.output();
dreschpe 0:d78b00f167cb 66 _ym.output();
dreschpe 0:d78b00f167cb 67 switch (orientation) {
dreschpe 0:d78b00f167cb 68 case(0):
dreschpe 0:d78b00f167cb 69 case(1):
dreschpe 0:d78b00f167cb 70 _yp = 1;
dreschpe 0:d78b00f167cb 71 _ym = 0;
dreschpe 0:d78b00f167cb 72 break;
dreschpe 0:d78b00f167cb 73 case(2):
dreschpe 0:d78b00f167cb 74 case(3):
dreschpe 0:d78b00f167cb 75 _yp = 0;
dreschpe 0:d78b00f167cb 76 _ym = 1;
dreschpe 0:d78b00f167cb 77 break;
dreschpe 0:d78b00f167cb 78 }
dreschpe 0:d78b00f167cb 79 _xm.input(); // x- have to be passive
dreschpe 0:d78b00f167cb 80 AnalogIn Ax(xa); // we have to call the constructor to switch to analog mode
dreschpe 0:d78b00f167cb 81 wait_us(10);
dreschpe 0:d78b00f167cb 82 x1 = Ax.read_u16(); // get x voltage
dreschpe 0:d78b00f167cb 83 d2 = (x1 > x2)? (x1-x2) : (x2-x1);
dreschpe 0:d78b00f167cb 84 if (((x1 < 8000) && (d2 < 2000)) || ((x1 > 8000) && (d2 < 150))) s2 ++;
dreschpe 0:d78b00f167cb 85 else {
dreschpe 0:d78b00f167cb 86 if (s2 > 0) s2 --;
dreschpe 0:d78b00f167cb 87 }
dreschpe 0:d78b00f167cb 88 x2 = x1;
dreschpe 0:d78b00f167cb 89 // debug
dreschpe 0:d78b00f167cb 90 //locate(1,8);
dreschpe 0:d78b00f167cb 91 //printf("d: %4d x: %5d s2: %4d",d2,x1,s2);
dreschpe 0:d78b00f167cb 92
dreschpe 0:d78b00f167cb 93 } while (s1 < 3 || s2 < 3); // read until we have three samples close together
dreschpe 0:d78b00f167cb 94 switch (orientation) {
dreschpe 0:d78b00f167cb 95 case(0):
dreschpe 0:d78b00f167cb 96 case(2):
dreschpe 0:d78b00f167cb 97 p.y = (x1+x2) / 2; // average of two sample
dreschpe 0:d78b00f167cb 98 p.x = (y1+y2) / 2;
dreschpe 0:d78b00f167cb 99 break;
dreschpe 0:d78b00f167cb 100 case(1):
dreschpe 0:d78b00f167cb 101 case(3):
dreschpe 0:d78b00f167cb 102 p.x = (x1+x2) / 2; // average of two sample
dreschpe 0:d78b00f167cb 103 p.y = (y1+y2) / 2;
dreschpe 0:d78b00f167cb 104 break;
dreschpe 0:d78b00f167cb 105 }
dreschpe 0:d78b00f167cb 106 return(p);
dreschpe 0:d78b00f167cb 107 }
dreschpe 0:d78b00f167cb 108
dreschpe 0:d78b00f167cb 109 void touch_tft::calibrate(void) {
dreschpe 0:d78b00f167cb 110 int i;
dreschpe 0:d78b00f167cb 111 int a = 0,b = 0,c = 0, d = 0;
dreschpe 2:ef7972c29c0e 112 int pos_x, pos_y;
dreschpe 0:d78b00f167cb 113 point p;
dreschpe 0:d78b00f167cb 114
dreschpe 0:d78b00f167cb 115 cls();
dreschpe 0:d78b00f167cb 116 line(0,3,6,3,White);
dreschpe 0:d78b00f167cb 117 line(3,0,3,6,White);
dreschpe 2:ef7972c29c0e 118
dreschpe 2:ef7972c29c0e 119 // get the center of the screen
dreschpe 2:ef7972c29c0e 120 pos_x = columns() / 2 - 3;
dreschpe 2:ef7972c29c0e 121 pos_x = pos_x * font[1];
dreschpe 2:ef7972c29c0e 122 pos_y = (rows() / 2) - 1;
dreschpe 2:ef7972c29c0e 123 pos_y = pos_y * font[2];
dreschpe 2:ef7972c29c0e 124
dreschpe 2:ef7972c29c0e 125 locate(pos_x,pos_y);
Vekotin 4:cef5cdc775ea 126 printf("KALIBROI");
dreschpe 2:ef7972c29c0e 127 locate(pos_x,pos_y + font[2]);
Vekotin 4:cef5cdc775ea 128 printf("KALIBROI");
dreschpe 0:d78b00f167cb 129 for (i=0; i<5; i++) {
dreschpe 0:d78b00f167cb 130 do {
dreschpe 0:d78b00f167cb 131 p = get_touch();
dreschpe 0:d78b00f167cb 132 } while (p.x < 0x2000 | p.y < 0x2000); // wait for touch
dreschpe 0:d78b00f167cb 133 a += p.x;
dreschpe 0:d78b00f167cb 134 b += p.y;
dreschpe 0:d78b00f167cb 135 }
dreschpe 0:d78b00f167cb 136 a = a / 5;
dreschpe 0:d78b00f167cb 137 b = b / 5;
dreschpe 2:ef7972c29c0e 138 locate(pos_x,pos_y);
dreschpe 0:d78b00f167cb 139 printf("OK ");
dreschpe 0:d78b00f167cb 140 do {
dreschpe 0:d78b00f167cb 141 p = get_touch();
dreschpe 0:d78b00f167cb 142 } while (p.y > 0x2000 | p.x > 0x2000); // wait for no touch
dreschpe 0:d78b00f167cb 143
dreschpe 0:d78b00f167cb 144 cls();
dreschpe 0:d78b00f167cb 145 line(width() -5, height() - 8,width() - 5,height() -1,White); // paint cross
dreschpe 0:d78b00f167cb 146 line(width() - 8,height() - 5,width() - 1,height() - 5,White);
dreschpe 2:ef7972c29c0e 147 locate(pos_x,pos_y);
Vekotin 4:cef5cdc775ea 148 printf("KALIBROI");
dreschpe 2:ef7972c29c0e 149 locate(pos_x,pos_y + font[2]);
Vekotin 4:cef5cdc775ea 150 printf("KALIBROI");
dreschpe 0:d78b00f167cb 151 for (i=0; i<5; i++) {
dreschpe 0:d78b00f167cb 152 do {
dreschpe 0:d78b00f167cb 153 p = get_touch();
dreschpe 0:d78b00f167cb 154 } while (p.y < 0x2000 | p.x < 0x2000); // wait for touch
dreschpe 0:d78b00f167cb 155 c+= p.x;
dreschpe 0:d78b00f167cb 156 d+= p.y;
dreschpe 0:d78b00f167cb 157 }
dreschpe 0:d78b00f167cb 158 c = c / 5;
dreschpe 0:d78b00f167cb 159 d = d / 5;
dreschpe 0:d78b00f167cb 160
dreschpe 2:ef7972c29c0e 161 locate(pos_x, pos_y);
dreschpe 0:d78b00f167cb 162 printf("OK ");
dreschpe 0:d78b00f167cb 163 do {
dreschpe 0:d78b00f167cb 164 p = get_touch();
dreschpe 0:d78b00f167cb 165 } while (p.y > 0x2000 | p.x > 0x2000); // wait for no touch
dreschpe 0:d78b00f167cb 166
dreschpe 0:d78b00f167cb 167 cls();
dreschpe 0:d78b00f167cb 168
dreschpe 0:d78b00f167cb 169 x_off = a;
dreschpe 0:d78b00f167cb 170 y_off = b;
dreschpe 0:d78b00f167cb 171
dreschpe 0:d78b00f167cb 172 i = c-a; // delta x
dreschpe 0:d78b00f167cb 173 pp_tx = i / (width() - 6);
dreschpe 0:d78b00f167cb 174
dreschpe 0:d78b00f167cb 175 i = d-b; // delta y
dreschpe 0:d78b00f167cb 176 pp_ty = i / (height() - 6);
dreschpe 0:d78b00f167cb 177 }
dreschpe 0:d78b00f167cb 178
dreschpe 0:d78b00f167cb 179
dreschpe 0:d78b00f167cb 180 point touch_tft::to_pixel(point a_point) {
dreschpe 0:d78b00f167cb 181 point p;
dreschpe 0:d78b00f167cb 182
dreschpe 0:d78b00f167cb 183 p.x = (a_point.x - x_off) / pp_tx;
dreschpe 2:ef7972c29c0e 184 if (p.x > width()) p.x = width();
dreschpe 0:d78b00f167cb 185 p.y = (a_point.y - y_off) / pp_ty;
dreschpe 2:ef7972c29c0e 186 if (p.y > height()) p.y = height();
dreschpe 0:d78b00f167cb 187 return (p);
dreschpe 0:d78b00f167cb 188 }
dreschpe 0:d78b00f167cb 189
dreschpe 2:ef7972c29c0e 190 bool touch_tft::is_touched(point a) {
dreschpe 2:ef7972c29c0e 191 if (a.x > threshold & a.y > threshold) return(true);
dreschpe 2:ef7972c29c0e 192 else return(false);
dreschpe 0:d78b00f167cb 193 }