David Prentice / TouchScreen_kbv_mbed

Resistive TouchScreen e.g. for MCUFRIEND Display Shields

Dependents:   TFT_Touch_botao_v1 TFT_Touch_exemplo5_git_touch TESTE_1 TFT_Touch_exemplo6_git_touch_button_3_ ... more

TouchScreen_kbv_mbed.cpp@2:f23dd0aaa0ec, 2021-05-17 (annotated)

Committer:
davidprentice
Date:
Mon May 17 08:10:08 2021 +0000
Revision:
2:f23dd0aaa0ec
Parent:
1:849734501e5a 
set output() when leaving getPoint().  not for readTouchX() etc

Who changed what in which revision?

UserRevisionLine numberNew contents of line
davidprentice 0:84f0f29e4695 1 // Touch screen library with X Y and Z (pressure) readings as well
davidprentice 0:84f0f29e4695 2 // as oversampling to avoid 'bouncing'
davidprentice 0:84f0f29e4695 3 // adapted from (c) ladyada / adafruit
davidprentice 0:84f0f29e4695 4
davidprentice 0:84f0f29e4695 5 #include "Arduino.h"
davidprentice 0:84f0f29e4695 6
davidprentice 0:84f0f29e4695 7 #include "TouchScreen_kbv_mbed.h"
davidprentice 0:84f0f29e4695 8
davidprentice 0:84f0f29e4695 9 #define NUMSAMPLES 3 //.kbv
davidprentice 1:849734501e5a 10 #if defined(__STM32F1__) || defined(ESP32) //Maple core
davidprentice 0:84f0f29e4695 11 #define ADC_ADJUST >>2
davidprentice 0:84f0f29e4695 12 #else
davidprentice 0:84f0f29e4695 13 #define ADC_ADJUST
davidprentice 0:84f0f29e4695 14 #endif
davidprentice 0:84f0f29e4695 15
davidprentice 0:84f0f29e4695 16 TSPoint_kbv::TSPoint_kbv(void)
davidprentice 0:84f0f29e4695 17 {
davidprentice 0:84f0f29e4695 18 x = y = 0;
davidprentice 0:84f0f29e4695 19 }
davidprentice 0:84f0f29e4695 20
davidprentice 0:84f0f29e4695 21 TSPoint_kbv::TSPoint_kbv(int16_t x0, int16_t y0, int16_t z0)
davidprentice 0:84f0f29e4695 22 {
davidprentice 0:84f0f29e4695 23 x = x0;
davidprentice 0:84f0f29e4695 24 y = y0;
davidprentice 0:84f0f29e4695 25 z = z0;
davidprentice 0:84f0f29e4695 26 }
davidprentice 0:84f0f29e4695 27
davidprentice 0:84f0f29e4695 28 bool TSPoint_kbv::operator==(TSPoint_kbv p1)
davidprentice 0:84f0f29e4695 29 {
davidprentice 0:84f0f29e4695 30 return ((p1.x == x) && (p1.y == y) && (p1.z == z));
davidprentice 0:84f0f29e4695 31 }
davidprentice 0:84f0f29e4695 32
davidprentice 0:84f0f29e4695 33 bool TSPoint_kbv::operator!=(TSPoint_kbv p1)
davidprentice 0:84f0f29e4695 34 {
davidprentice 0:84f0f29e4695 35 return ((p1.x != x) || (p1.y != y) || (p1.z != z));
davidprentice 0:84f0f29e4695 36 }
davidprentice 0:84f0f29e4695 37
davidprentice 0:84f0f29e4695 38 static void insert_sort(int array[], uint8_t size)
davidprentice 0:84f0f29e4695 39 {
davidprentice 0:84f0f29e4695 40 uint8_t j;
davidprentice 0:84f0f29e4695 41 int save;
davidprentice 0:84f0f29e4695 42
davidprentice 0:84f0f29e4695 43 for (int i = 1; i < size; i++) {
davidprentice 0:84f0f29e4695 44 save = array[i];
davidprentice 0:84f0f29e4695 45 for (j = i; j >= 1 && save < array[j - 1]; j--)
davidprentice 0:84f0f29e4695 46 array[j] = array[j - 1];
davidprentice 0:84f0f29e4695 47 array[j] = save;
davidprentice 0:84f0f29e4695 48 }
davidprentice 0:84f0f29e4695 49 }
davidprentice 0:84f0f29e4695 50
davidprentice 1:849734501e5a 51 // ***** conditional for MBED *****
davidprentice 1:849734501e5a 52 #if defined(__MBED__)
davidprentice 1:849734501e5a 53 TouchScreen_kbv::TouchScreen_kbv(PinName xp, PinName yp, PinName xm, PinName ym, uint16_t rxplate)
davidprentice 1:849734501e5a 54 {
davidprentice 1:849734501e5a 55 _yp = yp;
davidprentice 1:849734501e5a 56 _xm = xm;
davidprentice 1:849734501e5a 57 _ym = ym;
davidprentice 1:849734501e5a 58 _xp = xp;
davidprentice 1:849734501e5a 59 _rxplate = rxplate;
davidprentice 1:849734501e5a 60
davidprentice 1:849734501e5a 61 pressureThreshhold = 10;
davidprentice 1:849734501e5a 62 }
davidprentice 1:849734501e5a 63
davidprentice 0:84f0f29e4695 64 uint16_t TouchScreen_kbv::analogRead(PinName p)
davidprentice 0:84f0f29e4695 65 {
davidprentice 0:84f0f29e4695 66 AnalogIn _adc(p);
davidprentice 1:849734501e5a 67 return _adc.read_u16() >> 6; // MBED gives 16-bit
davidprentice 0:84f0f29e4695 68 }
davidprentice 0:84f0f29e4695 69
davidprentice 0:84f0f29e4695 70 void TouchScreen_kbv::pinModeVal(PinName p, uint8_t mode, uint8_t val)
davidprentice 0:84f0f29e4695 71 {
davidprentice 0:84f0f29e4695 72 DigitalInOut _out(p);
davidprentice 0:84f0f29e4695 73 if (mode) {
davidprentice 0:84f0f29e4695 74 _out.output();
davidprentice 0:84f0f29e4695 75 _out.write(val);
davidprentice 0:84f0f29e4695 76 } else {
davidprentice 0:84f0f29e4695 77 _out.input();
davidprentice 0:84f0f29e4695 78 _out.mode(PullNone);
davidprentice 0:84f0f29e4695 79 }
davidprentice 0:84f0f29e4695 80 }
davidprentice 1:849734501e5a 81 #else
davidprentice 1:849734501e5a 82 TouchScreen_kbv::TouchScreen_kbv(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym, uint16_t rxplate)
davidprentice 1:849734501e5a 83 {
davidprentice 1:849734501e5a 84 _yp = yp;
davidprentice 1:849734501e5a 85 _xm = xm;
davidprentice 1:849734501e5a 86 _ym = ym;
davidprentice 1:849734501e5a 87 _xp = xp;
davidprentice 1:849734501e5a 88 _rxplate = rxplate;
davidprentice 1:849734501e5a 89
davidprentice 1:849734501e5a 90 pressureThreshhold = 10;
davidprentice 1:849734501e5a 91 }
davidprentice 1:849734501e5a 92
davidprentice 1:849734501e5a 93 void TouchScreen_kbv::pinModeVal(uint8_t p, uint8_t mode, uint8_t val)
davidprentice 1:849734501e5a 94 {
davidprentice 1:849734501e5a 95 pinMode(p, mode);
davidprentice 1:849734501e5a 96 digitalWrite(p, val);
davidprentice 1:849734501e5a 97 }
davidprentice 1:849734501e5a 98 #endif
davidprentice 1:849734501e5a 99 // ******** end of conditional ****
davidprentice 0:84f0f29e4695 100
davidprentice 0:84f0f29e4695 101 TSPoint_kbv TouchScreen_kbv::getPoint(void)
davidprentice 0:84f0f29e4695 102 {
davidprentice 0:84f0f29e4695 103 int x, y, z;
davidprentice 0:84f0f29e4695 104 int samples[NUMSAMPLES];
davidprentice 0:84f0f29e4695 105 uint8_t i, valid = 1;
davidprentice 1:849734501e5a 106
davidprentice 0:84f0f29e4695 107 pinModeVal(_yp, 0, 0);
davidprentice 0:84f0f29e4695 108 pinModeVal(_ym, 0, 0);
davidprentice 0:84f0f29e4695 109 pinModeVal(_xp, 1, 1);
davidprentice 0:84f0f29e4695 110 pinModeVal(_xm, 1, 0);
davidprentice 0:84f0f29e4695 111
davidprentice 0:84f0f29e4695 112 for (i = 0; i < NUMSAMPLES; i++) {
davidprentice 0:84f0f29e4695 113 samples[i] = analogRead(_yp) ADC_ADJUST;
davidprentice 0:84f0f29e4695 114 }
davidprentice 0:84f0f29e4695 115 insert_sort(samples, NUMSAMPLES);
davidprentice 0:84f0f29e4695 116 x = (1023 - samples[NUMSAMPLES / 2]); //choose median
davidprentice 0:84f0f29e4695 117
davidprentice 0:84f0f29e4695 118 pinModeVal(_xp, 0, 0);
davidprentice 0:84f0f29e4695 119 pinModeVal(_xm, 0, 0);
davidprentice 0:84f0f29e4695 120 pinModeVal(_yp, 1, 1);
davidprentice 0:84f0f29e4695 121 pinModeVal(_ym, 1, 0);
davidprentice 0:84f0f29e4695 122
davidprentice 0:84f0f29e4695 123 for (i = 0; i < NUMSAMPLES; i++) {
davidprentice 0:84f0f29e4695 124 samples[i] = analogRead(_xm) ADC_ADJUST;
davidprentice 0:84f0f29e4695 125 }
davidprentice 0:84f0f29e4695 126
davidprentice 0:84f0f29e4695 127 insert_sort(samples, NUMSAMPLES);
davidprentice 0:84f0f29e4695 128
davidprentice 0:84f0f29e4695 129 y = (1023 - samples[NUMSAMPLES / 2]);
davidprentice 0:84f0f29e4695 130
davidprentice 0:84f0f29e4695 131 pinModeVal(_xp, 1, 0); // Set X+ to ground
davidprentice 0:84f0f29e4695 132 pinModeVal(_xm, 0, 0); // Hi-Z
davidprentice 0:84f0f29e4695 133 pinModeVal(_yp, 0, 0); // Hi-Z
davidprentice 0:84f0f29e4695 134 pinModeVal(_ym, 1, 1); // Set Y- to VCC
davidprentice 0:84f0f29e4695 135
davidprentice 0:84f0f29e4695 136 int z1 = analogRead(_xm) ADC_ADJUST;
davidprentice 0:84f0f29e4695 137 int z2 = analogRead(_yp) ADC_ADJUST;
davidprentice 0:84f0f29e4695 138
davidprentice 0:84f0f29e4695 139 z = (1023 - (z2 - z1));
davidprentice 0:84f0f29e4695 140
davidprentice 1:849734501e5a 141 // *** these two lines would ensure XM, YP are in Digital mode ***
davidprentice 2:f23dd0aaa0ec 142 pinModeVal(_xm, 1, 1); // OUTPUT HIGH
davidprentice 2:f23dd0aaa0ec 143 pinModeVal(_yp, 1, 1); // OUTPUT HIGH
davidprentice 0:84f0f29e4695 144
davidprentice 1:849734501e5a 145 return TSPoint_kbv(x, y, z); //XM, YP still in ANALOG mode
davidprentice 0:84f0f29e4695 146 }
davidprentice 0:84f0f29e4695 147
davidprentice 0:84f0f29e4695 148 int TouchScreen_kbv::readTouchX(void)
davidprentice 0:84f0f29e4695 149 {
davidprentice 1:849734501e5a 150 pinModeVal(_yp, 0, 0);
davidprentice 1:849734501e5a 151 pinModeVal(_ym, 0, 0);
davidprentice 1:849734501e5a 152 pinModeVal(_xp, 1, 1);
davidprentice 1:849734501e5a 153 pinModeVal(_xm, 1, 0);
davidprentice 0:84f0f29e4695 154
davidprentice 0:84f0f29e4695 155 return (1023 - (analogRead(_yp)) ADC_ADJUST);
davidprentice 0:84f0f29e4695 156 }
davidprentice 0:84f0f29e4695 157
davidprentice 0:84f0f29e4695 158 int TouchScreen_kbv::readTouchY(void)
davidprentice 0:84f0f29e4695 159 {
davidprentice 1:849734501e5a 160 pinModeVal(_xp, 0, 0);
davidprentice 1:849734501e5a 161 pinModeVal(_xm, 0, 0);
davidprentice 1:849734501e5a 162 pinModeVal(_yp, 1, 1);
davidprentice 1:849734501e5a 163 pinModeVal(_ym, 1, 0);
davidprentice 0:84f0f29e4695 164
davidprentice 0:84f0f29e4695 165 return (1023 - (analogRead(_xm)) ADC_ADJUST);
davidprentice 0:84f0f29e4695 166 }
davidprentice 0:84f0f29e4695 167
davidprentice 0:84f0f29e4695 168 uint16_t TouchScreen_kbv::pressure(void)
davidprentice 0:84f0f29e4695 169 {
davidprentice 1:849734501e5a 170 pinModeVal(_xp, 1, 0); // Set X+ to ground
davidprentice 1:849734501e5a 171 pinModeVal(_xm, 0, 0); // Hi-Z
davidprentice 1:849734501e5a 172 pinModeVal(_yp, 0, 0); // Hi-Z
davidprentice 1:849734501e5a 173 pinModeVal(_ym, 1, 1); // Set Y- to VCC
davidprentice 0:84f0f29e4695 174
davidprentice 0:84f0f29e4695 175 int z1 = analogRead(_xm) ADC_ADJUST;
davidprentice 0:84f0f29e4695 176 int z2 = analogRead(_yp) ADC_ADJUST;
davidprentice 0:84f0f29e4695 177
davidprentice 0:84f0f29e4695 178 return (1023 - (z2 - z1));
davidprentice 0:84f0f29e4695 179 }