TM1638.cpp

/*
TM1638.cpp - Library implementation for TM1638.

Copyright (C) 2011 Ricardo Batista (rjbatista <at> gmail <dot> com)

This program is free software: you can redistribute it and/or modify
it under the terms of the version 3 GNU General Public License as
published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#if defined(ARDUINO) && ARDUINO >= 100
	#include "Arduino.h"
#else
	#include "WProgram.h"
#endif

#include "TM1638.h"
#include "string.h"

TM1638::TM1638(byte dataPin, byte clockPin, byte strobePin, boolean activateDisplay, byte intensity)
	: TM16XX(dataPin, clockPin, strobePin, 8, activateDisplay, intensity)
{
	// nothing else to do - calling super is enough
}

void TM1638::setDisplayToHexNumber(unsigned long number, byte dots, boolean leadingZeros,
	const byte numberFont[])
{
  for (int i = 0; i < displays; i++) {
	if (!leadingZeros && number == 0) {
		clearDisplayDigit(displays - i - 1, (dots & (1 << i)) != 0);
	} else {
		setDisplayDigit(number & 0xF, displays - i - 1, (dots & (1 << i)) != 0, numberFont);
		number >>= 4;
    }
  }
}

void TM1638::setDisplayToDecNumberAt(unsigned long number, byte dots, byte startingPos, boolean leadingZeros,
	const byte numberFont[])
{
  if (number > 99999999L) {
    setDisplayToError();
  } else {
    for (int i = 0; i < displays - startingPos; i++) {
      if (number != 0) {
        setDisplayDigit(number % 10, displays - i - 1, (dots & (1 << i)) != 0, numberFont);
        number /= 10;
      } else {
		if (leadingZeros) {
		  setDisplayDigit(0, displays - i - 1, (dots & (1 << i)) != 0, numberFont);
		} else {
		  clearDisplayDigit(displays - i - 1, (dots & (1 << i)) != 0);
		}
      }
    }
  }
}

void TM1638::setDisplayToDecNumber(unsigned long number, byte dots, boolean leadingZeros,
	const byte numberFont[])
{
	setDisplayToDecNumberAt(number, dots, 0, leadingZeros, numberFont);
}

void TM1638::setDisplayToSignedDecNumber(signed long number, byte dots, boolean leadingZeros,
		const byte numberFont[])
{
	if (number >= 0) {
		setDisplayToDecNumberAt(number, dots, 0, leadingZeros, numberFont);
	} else {
		if (-number > 9999999L) {
		    setDisplayToError();
		} else {
			setDisplayToDecNumberAt(-number, dots, 1, leadingZeros, numberFont);
			sendChar(0, MINUS, (dots & (0x80)) != 0);
		}
	}
}

void TM1638::setDisplayToBinNumber(byte number, byte dots, const byte numberFont[])
{
  for (int i = 0; i < displays; i++) {
    setDisplayDigit((number & (1 << i)) == 0 ? 0 : 1, displays - i - 1, (dots & (1 << i)) != 0, numberFont);
  }
}

void TM1638::setLED(byte color, byte pos)
{
    sendData((pos << 1) + 1, color);
}

void TM1638::setLEDs(word leds)
{
  for (int i = 0; i < displays; i++) {
    byte color = 0;

    if ((leds & (1 << i)) != 0) {
      color |= TM1638_COLOR_RED;
    }

    if ((leds & (1 << (i + 8))) != 0) {
      color |= TM1638_COLOR_GREEN;
    }

    setLED(color, i);
  }
}

byte TM1638::getButtons(void)
{
  byte keys = 0;

  digitalWrite(strobePin, LOW);
  send(0x42);
  for (int i = 0; i < 4; i++) {
    keys |= receive() << i;
  }
  digitalWrite(strobePin, HIGH);

  return keys;
}

void TM1638::sendChar(byte pos, byte data, boolean dot)
{
	sendData(pos << 1, data | (dot ? 0b10000000 : 0));
}