A fast PCD8544 library (Nokia 5110)

Using Arduino Displays
32

Here my 5 cents, if anybody interested:

As different displays required different contrast settings, it is also preferable to have contrast settings available to sketch, I did mod library to have it:

Added to header file declaration of public function void contrast(uint8_t cnt);// argument range 0 to 15
[Added to CPP files, function

void PCD8544_SPI::contrast(uint8_t cnt)
{
	this->writeLcd(LCD_COMMAND, 0x21); //Tell LCD that extended commands follow
	cnt = map(cnt, 0, 15, 0xB0, 0xBF); // full range  = 0x80, 0xFF
    this->writeLcd(LCD_COMMAND, cnt); //Set LCD Vop (Contrast)
	this->writeLcd(LCD_COMMAND, 0x20); //We must send 0x20 before modifying the display control mode
	this->writeLcd(LCD_COMMAND, 0x0C); //Set display control, normal mode. 0x0D for inverse
	
}