polargraph_arduino/libraries/UTouch/UTouch.cpp

/*
  UTouch.cpp - Arduino/chipKit library support for Color TFT LCD Touch screens 
  Copyright (C)2010-2014 Henning Karlsen. All right reserved
  
  Basic functionality of this library are based on the demo-code provided by
  ITead studio. You can find the latest version of the library at
  http://www.henningkarlsen.com/electronics

  If you make any modifications or improvements to the code, I would appreciate
  that you share the code with me so that I might include it in the next release.
  I can be contacted through http://www.henningkarlsen.com/electronics/contact.php

  This library is free software; you can redistribute it and/or
  modify it under the terms of the CC BY-NC-SA 3.0 license.
  Please see the included documents for further information.

  Commercial use of this library requires you to buy a license that
  will allow commercial use. This includes using the library,
  modified or not, as a tool to sell products.

  The license applies to all part of the library including the 
  examples and tools supplied with the library.
*/

#include "UTouch.h"
#include "UTouchCD.h"

#if defined(__AVR__)
	#include "hardware/avr/HW_AVR.inc"
#elif defined(__PIC32MX__)
	#include "hardware/pic32/HW_PIC32.inc"
#elif defined(__arm__)
	#include "hardware/arm/HW_ARM.inc"
#endif

UTouch::UTouch(byte tclk, byte tcs, byte din, byte dout, byte irq)
{
	T_CLK	= tclk;
	T_CS	= tcs;
	T_DIN	= din;
	T_DOUT	= dout;
	T_IRQ	= irq;
}

void UTouch::InitTouch(byte orientation)
{
	orient					= orientation;
	_default_orientation	= CAL_S>>31;
	touch_x_left			= (CAL_X>>14) & 0x3FFF;
	touch_x_right			= CAL_X & 0x3FFF;
	touch_y_top				= (CAL_Y>>14) & 0x3FFF;
	touch_y_bottom			= CAL_Y & 0x3FFF;
	disp_x_size				= (CAL_S>>12) & 0x0FFF;
	disp_y_size				= CAL_S & 0x0FFF;
	prec					= 10;

	P_CLK	= portOutputRegister(digitalPinToPort(T_CLK));
	B_CLK	= digitalPinToBitMask(T_CLK);
	P_CS	= portOutputRegister(digitalPinToPort(T_CS));
	B_CS	= digitalPinToBitMask(T_CS);
	P_DIN	= portOutputRegister(digitalPinToPort(T_DIN));
	B_DIN	= digitalPinToBitMask(T_DIN);
	P_DOUT	= portInputRegister(digitalPinToPort(T_DOUT));
	B_DOUT	= digitalPinToBitMask(T_DOUT);
	P_IRQ	= portInputRegister(digitalPinToPort(T_IRQ));
	B_IRQ	= digitalPinToBitMask(T_IRQ);

	pinMode(T_CLK,  OUTPUT);
    pinMode(T_CS,   OUTPUT);
    pinMode(T_DIN,  OUTPUT);
    pinMode(T_DOUT, INPUT);
    pinMode(T_IRQ,  OUTPUT);

	sbi(P_CS, B_CS);
	sbi(P_DIN, B_DIN);
	sbi(P_IRQ, B_IRQ);
	sbi(P_CLK, B_CLK);
}

void UTouch::read()
{
	unsigned long tx=0, temp_x=0;
	unsigned long ty=0, temp_y=0;
	unsigned long minx=99999, maxx=0;
	unsigned long miny=99999, maxy=0;
	int datacount=0;

	cbi(P_CS, B_CS);                    

	pinMode(T_IRQ,  INPUT);
	for (int i=0; i<prec; i++)
	{
		if (!rbi(P_IRQ, B_IRQ))
		{
			touch_WriteData(0x90);        
			pulse_high(P_CLK, B_CLK);
			temp_x=touch_ReadData();

			if (!rbi(P_IRQ, B_IRQ))
			{
				touch_WriteData(0xD0);      
				pulse_high(P_CLK, B_CLK);
				temp_y=touch_ReadData();

				if ((temp_x>0) and (temp_x<4096) and (temp_y>0) and (temp_y<4096))
				{
					tx+=temp_x;
					ty+=temp_y;
					if (prec>5)
					{
						if (temp_x<minx)
							minx=temp_x;
						if (temp_x>maxx)
							maxx=temp_x;
						if (temp_y<miny)
							miny=temp_y;
						if (temp_y>maxy)
							maxy=temp_y;
					}
					datacount++;
				}
			}
		}
	}
	pinMode(T_IRQ,  OUTPUT);

	if (prec>5)
	{
		tx = tx-(minx+maxx);
		ty = ty-(miny+maxy);
		datacount -= 2;
	}

	sbi(P_CS, B_CS);                    
	if ((datacount==(prec-2)) or (datacount==PREC_LOW))
	{
		if (orient == _default_orientation)
		{
			TP_X=ty/datacount;
			TP_Y=tx/datacount;
		}
		else
		{
			TP_X=tx/datacount;
			TP_Y=ty/datacount;
		}
	}
	else
	{
		TP_X=-1;
		TP_Y=-1;
	}
}

bool UTouch::dataAvailable()
{
	bool avail;
	pinMode(T_IRQ,  INPUT);
	avail = !(rbi(P_IRQ, B_IRQ));
	pinMode(T_IRQ,  OUTPUT);
	return avail;
}

int16_t UTouch::getX()
{
	long c;

	if ((TP_X==-1) or (TP_Y==-1))
		return -1;
	if (orient == _default_orientation)
	{
		c = long(long(TP_X - touch_x_left) * (disp_x_size)) / long(touch_x_right - touch_x_left);
		if (c<0)
			c = 0;
		if (c>disp_x_size)
			c = disp_x_size;
	}
	else
	{
		if (_default_orientation == PORTRAIT)
			c = long(long(TP_X - touch_y_top) * (-disp_y_size)) / long(touch_y_bottom - touch_y_top) + long(disp_y_size);
		else
			c = long(long(TP_X - touch_y_top) * (disp_y_size)) / long(touch_y_bottom - touch_y_top);
		if (c<0)
			c = 0;
		if (c>disp_y_size)
			c = disp_y_size;
	}
	return c;
}

int16_t UTouch::getY()
{
	int c;

	if ((TP_X==-1) or (TP_Y==-1))
		return -1;
	if (orient == _default_orientation)
	{
		c = long(long(TP_Y - touch_y_top) * (disp_y_size)) / long(touch_y_bottom - touch_y_top);
		if (c<0)
			c = 0;
		if (c>disp_y_size)
			c = disp_y_size;
	}
	else
	{
		if (_default_orientation == PORTRAIT)
			c = long(long(TP_Y - touch_x_left) * (disp_x_size)) / long(touch_x_right - touch_x_left);
		else
			c = long(long(TP_Y - touch_x_left) * (-disp_x_size)) / long(touch_x_right - touch_x_left) + long(disp_x_size);
		if (c<0)
			c = 0;
		if (c>disp_x_size)
			c = disp_x_size;
	}
	return c;
}

void UTouch::setPrecision(byte precision)
{
	switch (precision)
	{
		case PREC_LOW:
			prec=1;		// DO NOT CHANGE!
			break;
		case PREC_MEDIUM:
			prec=12;	// Iterations + 2
			break;
		case PREC_HI:
			prec=27;	// Iterations + 2
			break;
		case PREC_EXTREME:
			prec=102;	// Iterations + 2
			break;
		default:
			prec=12;	// Iterations + 2
			break;
	}
}

void UTouch::calibrateRead()
{
	unsigned long tx=0;
	unsigned long ty=0;

	cbi(P_CS, B_CS);                    

	touch_WriteData(0x90);        
	pulse_high(P_CLK, B_CLK);
	tx=touch_ReadData();

	touch_WriteData(0xD0);      
	pulse_high(P_CLK, B_CLK);
	ty=touch_ReadData();

	sbi(P_CS, B_CS);                    

	TP_X=ty;
	TP_Y=tx;
}