/*

LedMatrix.cpp - Library for controlling 8*8 LED matrix through SPI

Uses the SPI library for SPI communication

Created by Razvan Chiriac, July 18th, 2013

Connect to "Output SPI" JP4 on LED Matrix

DIO 10 = CSn (JP4-3)

DIO 11 = MOSI (JP4-2)

DIO 13 = SCK (JP4-4)

5V = VCC (JP4-5 or JP4-6)

GND = GND (JP4-1)

*/

#include "Arduino.h"

#include "LedMatrix.h"

#include "SPI.h"

//constructor

LedMatrix::LedMatrix(int CSn)

{

pinMode(CSn, OUTPUT);

_CSn = CSn;

SPI.begin();

SPI.setClockDivider(SPI_CLOCK_DIV128);

SPI.setDataMode(SPI_MODE0);

}

//make() transfers values from the 2D array called matrix[][]

//to the led matrix through SPI

//gets called after matrix[][] is set as desired

void LedMatrix::make()

{

digitalWrite(_CSn,LOW);

delay(1);

for ( int i=0; i<8; i++ )

{

for ( int j=0; j<8; j++ )

{

SPI.transfer(matrix[i][j]);

}

}

delay(1);

digitalWrite(_CSn,HIGH);

}

//setMatrix(int color) makes matrix[][] to one value

//1=green. 2=red. 3=yellow.

void LedMatrix::setMatrix(int color)

{

for(int r=0;r<8;r++){

for(int c=0;c<8;c++){

matrix[r][c]= color;

}

}

}

//drawSquare(int x, int y, int side, int color) draws a square

//x, y = upper-right corner coordinates (1-8).

//side = side length. color: 1=green. 2=red. 3=yellow.

void LedMatrix::drawSquare(int x, int y, int side, int color)

{

int row = (y-1)%8;

int col = (x-1)%8;

setMatrix(0);

make();

for (int s=0; s<side; s++){

matrix[row][col+s]=color;

matrix[row+s][col]=color;

matrix[row+side-1][col+s]=color;

matrix[row+s][col+side-1]=color;

}

make();

setMatrix(0);

}

//drawDot(int x, int y, int color) draws one dot

//x, y = coordinates (1-8).

//color: 1=green. 2=red. 3=yellow.

void LedMatrix::drawDot(int x, int y, int color)

{

setMatrix(0);

matrix[y-1][x-1] = color;

make();

setMatrix(0);

}

//drawDotOver(int x, int y, int color) draws

//one dor without erasing what was on the screen before

//x, y = coordinates (1-8).

//color: 1=green. 2=red. 3=yellow.

void LedMatrix::drawDotOver(int x, int y, int color)

{

matrix[y-1][x-1] = color;

make();

}

//clearDotOver(int x, int y) erases the dot

//at coordinates x and y (1-8)

void LedMatrix::clearDotOver(int x, int y)

{

matrix[y-1][x-1] = 0;

make();

}