Initialisation

libraries/Adafruit_PCD8544/Adafruit_PCD8544.h

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+/*********************************************************************
+This is a library for our Monochrome Nokia 5110 LCD Displays
+
+  Pick one up today in the adafruit shop!
+  ------> http://www.adafruit.com/products/338
+
+These displays use SPI to communicate, 4 or 5 pins are required to  
+interface
+
+Adafruit invests time and resources providing this open source code, 
+please support Adafruit and open-source hardware by purchasing 
+products from Adafruit!
+
+Written by Limor Fried/Ladyada  for Adafruit Industries.  
+BSD license, check license.txt for more information
+All text above, and the splash screen must be included in any redistribution
+*********************************************************************/
+
+#if defined(ARDUINO) && ARDUINO >= 100
+  #include "Arduino.h"
+#else
+  #include "WProgram.h"
+  #include "pins_arduino.h"
+#endif
+
+#define BLACK 1
+#define WHITE 0
+
+#define LCDWIDTH 84
+#define LCDHEIGHT 48
+
+#define PCD8544_POWERDOWN 0x04
+#define PCD8544_ENTRYMODE 0x02
+#define PCD8544_EXTENDEDINSTRUCTION 0x01
+
+#define PCD8544_DISPLAYBLANK 0x0
+#define PCD8544_DISPLAYNORMAL 0x4
+#define PCD8544_DISPLAYALLON 0x1
+#define PCD8544_DISPLAYINVERTED 0x5
+
+// H = 0
+#define PCD8544_FUNCTIONSET 0x20
+#define PCD8544_DISPLAYCONTROL 0x08
+#define PCD8544_SETYADDR 0x40
+#define PCD8544_SETXADDR 0x80
+
+// H = 1
+#define PCD8544_SETTEMP 0x04
+#define PCD8544_SETBIAS 0x10
+#define PCD8544_SETVOP 0x80
+
+class Adafruit_PCD8544 : public Adafruit_GFX {
+ public:
+  Adafruit_PCD8544(int8_t SCLK, int8_t DIN, int8_t DC, int8_t CS, int8_t RST);
+  Adafruit_PCD8544(int8_t SCLK, int8_t DIN, int8_t DC, int8_t RST);
+
+  void begin(uint8_t contrast = 40);
+  
+  void command(uint8_t c);
+  void data(uint8_t c);
+  
+  void setContrast(uint8_t val);
+  void clearDisplay(void);
+  void display();
+  
+  void drawPixel(int16_t x, int16_t y, uint16_t color);
+  uint8_t getPixel(int8_t x, int8_t y);
+
+ private:
+  int8_t _din, _sclk, _dc, _rst, _cs;
+  volatile uint8_t *mosiport, *clkport, *csport, *dcport;
+  uint8_t mosipinmask, clkpinmask, cspinmask, dcpinmask;
+
+  void slowSPIwrite(uint8_t c);
+  void fastSPIwrite(uint8_t c);
+};