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LedMatrix.cpp
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LedMatrix.cpp
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#include <SPI.h>
#include "LedMatrix.h"
#include "cp437font.h"
/**
* Heavily influenced by the code and the blog posts from https://github.com/nickgammon/MAX7219_Dot_Matrix
*/
LedMatrix::LedMatrix(byte numberOfDevices, byte slaveSelectPin) {
myNumberOfDevices = numberOfDevices;
mySlaveSelectPin = slaveSelectPin;
cols = new byte[numberOfDevices * 8];
rotatedCols = new byte[numberOfDevices * 8];
}
LedMatrix::LedMatrix(byte numberOfDevices, int8_t sck, int8_t miso, int8_t mosi, byte slaveSelectPin) {
myNumberOfDevices = numberOfDevices;
mySlaveSelectPin = slaveSelectPin;
cols = new byte[numberOfDevices * 8];
rotatedCols = new byte[numberOfDevices * 8];
customSpiPins = true;
_sck = sck;
_miso = miso;
_mosi = mosi;
}
/**
* numberOfDevices: how many modules are daisy changed togehter
* slaveSelectPin: which pin is controlling the CS/SS pin of the first module?
*/
void LedMatrix::init() {
pinMode(mySlaveSelectPin, OUTPUT);
if(customSpiPins){
SPI.begin ( _sck, _miso, _mosi, mySlaveSelectPin);
} else {
SPI.begin ();
}
SPI.setDataMode(SPI_MODE0);
SPI.setClockDivider(SPI_CLOCK_DIV128);
for(byte device = 0; device < myNumberOfDevices; device++) {
sendByte (device, MAX7219_REG_SCANLIMIT, 7); // show all 8 digits
sendByte (device, MAX7219_REG_DECODEMODE, 0); // using an led matrix (not digits)
sendByte (device, MAX7219_REG_DISPLAYTEST, 0); // no display test
sendByte (device, MAX7219_REG_INTENSITY, 0); // character intensity: range: 0 to 15
sendByte (device, MAX7219_REG_SHUTDOWN, 1); // not in shutdown mode (ie. start it up)
}
}
void LedMatrix::sendByte (const byte device, const byte reg, const byte data) {
int offset=device;
int maxbytes=myNumberOfDevices;
for(int i=0;i<maxbytes;i++) {
spidata[i] = (byte)0;
spiregister[i] = (byte)0;
}
// put our device data into the array
spiregister[offset] = reg;
spidata[offset] = data;
// enable the line
digitalWrite(mySlaveSelectPin,LOW);
// now shift out the data
for(int i=0;i<myNumberOfDevices;i++) {
SPI.transfer (spiregister[i]);
SPI.transfer (spidata[i]);
}
digitalWrite (mySlaveSelectPin, HIGH);
}
void LedMatrix::sendByte (const byte reg, const byte data) {
for(byte device = 0; device < myNumberOfDevices; device++) {
sendByte(device, reg, data);
}
}
void LedMatrix::setIntensity(const byte intensity) {
sendByte(MAX7219_REG_INTENSITY, intensity);
}
void LedMatrix::setCharWidth(byte charWidth) {
myCharWidth = charWidth;
}
void LedMatrix::setTextAlignment(byte textAlignment) {
myTextAlignment = textAlignment;
calculateTextAlignmentOffset();
}
void LedMatrix::calculateTextAlignmentOffset() {
switch(myTextAlignment) {
case TEXT_ALIGN_LEFT:
myTextAlignmentOffset = 0;
break;
case TEXT_ALIGN_LEFT_END:
myTextAlignmentOffset = myNumberOfDevices * 8;
break;
case TEXT_ALIGN_RIGHT:
myTextAlignmentOffset = myText.length() * myCharWidth - myNumberOfDevices * 8;
break;
case TEXT_ALIGN_RIGHT_END:
myTextAlignmentOffset = - myText.length() * myCharWidth;
break;
}
}
void LedMatrix::clear() {
for (byte col = 0; col < myNumberOfDevices * 8; col++) {
cols[col] = 0;
}
}
void LedMatrix::commit() {
if ( rotationIsEnabled ) {
rotateLeft();
}
for (byte col = 0; col < myNumberOfDevices * 8; col++) {
sendByte(col / 8, col % 8 + 1, cols[col]);
}
}
void LedMatrix::setText(String text) {
myText = text;
myTextOffset = 0;
calculateTextAlignmentOffset();
}
void LedMatrix::setNextText(String nextText) {
myNextText = nextText;
}
void LedMatrix::scrollTextRight() {
myTextOffset = (myTextOffset + 1) % ((int)myText.length() * myCharWidth - 5);
}
void LedMatrix::scrollTextLeft() {
myTextOffset = (myTextOffset - 1) % ((int)myText.length() * myCharWidth + myNumberOfDevices * 8);
if (myTextOffset == 0 && myNextText.length() > 0) {
myText = myNextText;
myNextText = "";
calculateTextAlignmentOffset();
}
}
void LedMatrix::oscillateText() {
int maxColumns = (int)myText.length() * myCharWidth;
int maxDisplayColumns = myNumberOfDevices * 8;
if (maxDisplayColumns > maxColumns) {
return;
}
if (myTextOffset - maxDisplayColumns == -maxColumns) {
increment = 1;
}
if (myTextOffset == 0) {
increment = -1;
}
myTextOffset += increment;
}
void LedMatrix::drawText() {
char letter;
int position = 0;
for (int i = 0; i < myText.length(); i++) {
letter = myText.charAt(i);
for (byte col = 0; col < 8; col++) {
position = i * myCharWidth + col + myTextOffset + myTextAlignmentOffset;
if (position >= 0 && position < myNumberOfDevices * 8) {
setColumn(position, pgm_read_byte (&cp437_font [letter] [col]));
}
}
}
}
void LedMatrix::setColumn(int column, byte value) {
if (column < 0 || column >= myNumberOfDevices * 8) {
return;
}
cols[column] = value;
}
void LedMatrix::setPixel(byte x, byte y) {
bitWrite(cols[x], y, true);
}
void LedMatrix::setRotation(bool enabled) {
rotationIsEnabled = enabled;
}
void LedMatrix::rotateLeft() {
for (byte deviceNum = 0; deviceNum < myNumberOfDevices; deviceNum++) {
for(byte posY = 0; posY < 8; posY++) {
for(byte posX = 0; posX < 8; posX++) {
bitWrite(rotatedCols[8 * (deviceNum) + posY], posX, bitRead(cols[8 * (deviceNum) + 7-posX], posY));
}
}
}
memcpy(cols, rotatedCols, myNumberOfDevices * 8);
}