ArduinoLEDMatrix/ScreenBuffer.cpp at master · waldobronchart/ArduinoLEDMatrix · GitHub

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#include"ScreenBuffer.h"
#include"arduino.h"

ScreenBuffer* ScreenBuffer::_instance = 0;

ScreenBuffer::ScreenBuffer(int width, int height) : _width(width), _height(height), _size(width*height), _currentRow(0)
{
	_instance = this;

	_buffer = newunsignedlong[height];
ClearBuffer();
}

ScreenBuffer::~ScreenBuffer(void)
{
	_instance = 0;
delete _buffer;
}

ScreenBuffer* ScreenBuffer::GetInstance()
{
return _instance;
}

voidScreenBuffer::SetupRowPins(int dataPin, int latchPin, int clockPin)
{
	_rowDataPin = dataPin;
	_rowLatchPin = latchPin;
	_rowClockPin = clockPin;

pinMode(dataPin, OUTPUT);
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
}

voidScreenBuffer::SetupColumnPins(int dataPin, int latchPin, int clockPin)
{
	_colDataPin = dataPin;
	_colLatchPin = latchPin;
	_colClockPin = clockPin;

pinMode(dataPin, OUTPUT);
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
}

intScreenBuffer::GetWidth()
{
return _width;
}

intScreenBuffer::GetHeight()
{
return _height;
}

voidScreenBuffer::Write(int x, int y, int value)
{
// Clip
if (x < 0 || x > _width-1 || y < 0 || y > _height-1)
return;

if (value > 0)
	{
 _buffer[y] |= 1 << x;
return;
	}

	_buffer[y] ^= 1 << x;
}

voidScreenBuffer::ClearBuffer()
{
for (int i=0; i<_height; ++i)
	{
 _buffer[i] = 0;
	}
}

voidScreenBuffer::SyncNext()
{
	_currentRow++;
if (_currentRow == _height)
 _currentRow = 0;

SyncRow(_currentRow);
}

voidScreenBuffer::SyncRow(int row)
{
// Clear column data in register before moving to next row
ShiftZeros(_colDataPin, _colLatchPin, _colClockPin, _width);

// Shift current row out (1 of all rows will be illuminated)
ShiftSingle(_rowDataPin, _rowLatchPin, _rowClockPin, (row==0)?1:0);

// Shift column data out
digitalWrite(_colLatchPin, LOW);
for (int col=0; col<_width; ++col)
	{
digitalWrite(_colClockPin, LOW);

int val = (_buffer[row] >> col) & 1;
digitalWrite(_colDataPin, val);

digitalWrite(_colClockPin, HIGH);
	}
digitalWrite(_colLatchPin, HIGH);
}

voidScreenBuffer::Sync()
{
// Row by row shifting, top to bottom
for (int row=0; row<_height; ++row)
	{
SyncRow(row);

// Let it flow
delayMicroseconds(500);
	}

// Shift last bit out of the row
ShiftSingle(_rowDataPin, _rowLatchPin, _rowClockPin, 0);
}

voidScreenBuffer::ShiftZeros(int data, int latch, int clock, int numshifts)
{
digitalWrite(latch, LOW);
digitalWrite(data, LOW);
digitalWrite(clock, LOW);

for (int i=0; i<numshifts; i++)
	{
digitalWrite(clock, LOW);
digitalWrite(data, LOW);
digitalWrite(clock, HIGH);
	}

digitalWrite(latch, HIGH);
}

voidScreenBuffer::ShiftSingle(int data, int latch, int clock, int value)
{
digitalWrite(latch, LOW);
digitalWrite(clock, LOW);
digitalWrite(data, value);
digitalWrite(clock, HIGH);
digitalWrite(latch, HIGH);
}