Add files via upload

libraries/TouchScreen/TouchScreen.cpp

@@ -0,0 +1,241 @@
+// Touch screen library with X Y and Z (pressure) readings as well
+// as oversampling to avoid 'bouncing'
+// (c) ladyada / adafruit
+// Code under MIT License
+
+#include "pins_arduino.h"
+#include "wiring_private.h"
+#include <avr/pgmspace.h>
+#include "TouchScreen.h"
+
+// increase or decrease the touchscreen oversampling. This is a little different than you make think:
+// 1 is no oversampling, whatever data we get is immediately returned
+// 2 is double-sampling and we only return valid data if both points are the same
+// 3+ uses insert sort to get the median value.
+// We found 2 is precise yet not too slow so we suggest sticking with it!
+
+#define NUMSAMPLES 2
+
+TSPoint::TSPoint(void) {
+  x = y = 0;
+}
+
+TSPoint::TSPoint(int16_t x0, int16_t y0, int16_t z0) {
+  x = x0;
+  y = y0;
+  z = z0;
+}
+
+bool TSPoint::operator==(TSPoint p1) {
+  return  ((p1.x == x) && (p1.y == y) && (p1.z == z));
+}
+
+bool TSPoint::operator!=(TSPoint p1) {
+  return  ((p1.x != x) || (p1.y != y) || (p1.z != z));
+}
+
+#if (NUMSAMPLES > 2)
+static void insert_sort(int array[], uint8_t size) {
+  uint8_t j;
+  int save;
+
+  for (int i = 1; i < size; i++) {
+    save = array[i];
+    for (j = i; j >= 1 && save < array[j - 1]; j--)
+      array[j] = array[j - 1];
+    array[j] = save; 
+  }
+}
+#endif
+
+TSPoint TouchScreen::getPoint(void) {
+  int x, y, z;
+  int samples[NUMSAMPLES];
+  uint8_t i, valid;
+
+
+  uint8_t xp_port = digitalPinToPort(_xp);
+  uint8_t yp_port = digitalPinToPort(_yp);
+  uint8_t xm_port = digitalPinToPort(_xm);
+  uint8_t ym_port = digitalPinToPort(_ym);
+
+  uint8_t xp_pin = digitalPinToBitMask(_xp);
+  uint8_t yp_pin = digitalPinToBitMask(_yp);
+  uint8_t xm_pin = digitalPinToBitMask(_xm);
+  uint8_t ym_pin = digitalPinToBitMask(_ym);
+
+
+  valid = 1;
+
+  pinMode(_yp, INPUT);
+  pinMode(_ym, INPUT);
+
+  *portOutputRegister(yp_port) &= ~yp_pin;
+  *portOutputRegister(ym_port) &= ~ym_pin;
+  //digitalWrite(_yp, LOW);
+  //digitalWrite(_ym, LOW);
+
+  pinMode(_xp, OUTPUT);
+  pinMode(_xm, OUTPUT);
+  //digitalWrite(_xp, HIGH);
+  //digitalWrite(_xm, LOW);
+  *portOutputRegister(xp_port) |= xp_pin;
+  *portOutputRegister(xm_port) &= ~xm_pin;
+
+   for (i=0; i<NUMSAMPLES; i++) {
+     samples[i] = analogRead(_yp);
+   }
+#if NUMSAMPLES > 2
+   insert_sort(samples, NUMSAMPLES);
+#endif
+#if NUMSAMPLES == 2
+   if (samples[0] != samples[1]) { valid = 0; }
+#endif
+   x = (1023-samples[NUMSAMPLES/2]);
+
+   pinMode(_xp, INPUT);
+   pinMode(_xm, INPUT);
+   *portOutputRegister(xp_port) &= ~xp_pin;
+   //digitalWrite(_xp, LOW);
+
+   pinMode(_yp, OUTPUT);
+   *portOutputRegister(yp_port) |= yp_pin;
+   //digitalWrite(_yp, HIGH);
+   pinMode(_ym, OUTPUT);
+
+   for (i=0; i<NUMSAMPLES; i++) {
+     samples[i] = analogRead(_xm);
+   }
+
+#if NUMSAMPLES > 2
+   insert_sort(samples, NUMSAMPLES);
+#endif
+#if NUMSAMPLES == 2
+   if (samples[0] != samples[1]) { valid = 0; }
+#endif
+
+   y = (1023-samples[NUMSAMPLES/2]);
+
+   // Set X+ to ground
+   pinMode(_xp, OUTPUT);
+   *portOutputRegister(xp_port) &= ~xp_pin;
+   //digitalWrite(_xp, LOW);
+
+   // Set Y- to VCC
+   *portOutputRegister(ym_port) |= ym_pin;
+   //digitalWrite(_ym, HIGH); 
+
+   // Hi-Z X- and Y+
+   *portOutputRegister(yp_port) &= ~yp_pin;
+   //digitalWrite(_yp, LOW);
+   pinMode(_yp, INPUT);
+
+   int z1 = analogRead(_xm); 
+   int z2 = analogRead(_yp);
+
+   if (_rxplate != 0) {
+     // now read the x 
+     float rtouch;
+     rtouch = z2;
+     rtouch /= z1;
+     rtouch -= 1;
+     rtouch *= x;
+     rtouch *= _rxplate;
+     rtouch /= 1024;
+
+     z = rtouch;
+   } else {
+     z = (1023-(z2-z1));
+   }
+
+   if (! valid) {
+     z = 0;
+   }
+
+   return TSPoint(x, y, z);
+}
+
+TouchScreen::TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym) {
+  _yp = yp;
+  _xm = xm;
+  _ym = ym;
+  _xp = xp;
+  _rxplate = 0;
+  pressureThreshhold = 10;
+}
+
+
+TouchScreen::TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym,
+			 uint16_t rxplate) {
+  _yp = yp;
+  _xm = xm;
+  _ym = ym;
+  _xp = xp;
+  _rxplate = rxplate;
+
+  pressureThreshhold = 10;
+}
+
+int TouchScreen::readTouchX(void) {
+   pinMode(_yp, INPUT);
+   pinMode(_ym, INPUT);
+   digitalWrite(_yp, LOW);
+   digitalWrite(_ym, LOW);
+
+   pinMode(_xp, OUTPUT);
+   digitalWrite(_xp, HIGH);
+   pinMode(_xm, OUTPUT);
+   digitalWrite(_xm, LOW);
+
+   return (1023-analogRead(_yp));
+}
+
+
+int TouchScreen::readTouchY(void) {
+   pinMode(_xp, INPUT);
+   pinMode(_xm, INPUT);
+   digitalWrite(_xp, LOW);
+   digitalWrite(_xm, LOW);
+
+   pinMode(_yp, OUTPUT);
+   digitalWrite(_yp, HIGH);
+   pinMode(_ym, OUTPUT);
+   digitalWrite(_ym, LOW);
+
+   return (1023-analogRead(_xm));
+}
+
+
+uint16_t TouchScreen::pressure(void) {
+  // Set X+ to ground
+  pinMode(_xp, OUTPUT);
+  digitalWrite(_xp, LOW);
+
+  // Set Y- to VCC
+  pinMode(_ym, OUTPUT);
+  digitalWrite(_ym, HIGH); 
+
+  // Hi-Z X- and Y+
+  digitalWrite(_xm, LOW);
+  pinMode(_xm, INPUT);
+  digitalWrite(_yp, LOW);
+  pinMode(_yp, INPUT);
+
+  int z1 = analogRead(_xm); 
+  int z2 = analogRead(_yp);
+
+  if (_rxplate != 0) {
+    // now read the x 
+    float rtouch;
+    rtouch = z2;
+    rtouch /= z1;
+    rtouch -= 1;
+    rtouch *= readTouchX();
+    rtouch *= _rxplate;
+    rtouch /= 1024;
+
+    return rtouch;
+  } else {
+    return (1023-(z2-z1));
+  }
+}

libraries/TouchScreen/TouchScreen.h

@@ -0,0 +1,38 @@
+// Touch screen library with X Y and Z (pressure) readings as well
+// as oversampling to avoid 'bouncing'
+// (c) ladyada / adafruit
+// Code under MIT License
+
+#ifndef _ADAFRUIT_TOUCHSCREEN_H_
+#define _ADAFRUIT_TOUCHSCREEN_H_
+#include <stdint.h>
+
+class TSPoint {
+ public:
+  TSPoint(void);
+  TSPoint(int16_t x, int16_t y, int16_t z);
+
+  bool operator==(TSPoint);
+  bool operator!=(TSPoint);
+
+  int16_t x, y, z;
+};
+
+class TouchScreen {
+ public:
+  TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym);
+  TouchScreen(uint8_t xp, uint8_t yp, uint8_t xm, uint8_t ym, uint16_t rx);
+
+  bool isTouching(void);
+  uint16_t pressure(void);
+  int readTouchY();
+  int readTouchX();
+  TSPoint getPoint();
+  int16_t pressureThreshhold;
+
+private:
+  uint8_t _yp, _ym, _xm, _xp;
+  uint16_t _rxplate;
+};
+
+#endif