File content as of revision 33:4f3948dcd2f7:

#ifndef N5110_H
#define N5110_H

#include "mbed.h"

// number of pixels on display
#define WIDTH 84
#define HEIGHT 48
#define BANKS 6

/// Fill types for 2D shapes
enum FillType {
    FILL_TRANSPARENT, ///< Transparent with outline
    FILL_BLACK,       ///< Filled black
    FILL_WHITE,       ///< Filled white (no outline)
};

/** N5110 Class
@brief Library for interfacing with Nokia 5110 LCD display (https://www.sparkfun.com/products/10168) using the hardware SPI on the mbed.
@brief The display is powered from a GPIO pin meaning it can be controlled via software.  The LED backlight is also software-controllable (via PWM pin).
@brief Can print characters and strings to the display using the included 5x7 font.
@brief The library also implements a screen buffer so that individual pixels on the display (84 x 48) can be set, cleared and read.
@brief The library can print primitive shapes (lines, circles, rectangles)
@brief Acknowledgements to Chris Yan's Nokia_5110 Library.

@brief Revision 1.3

@author Craig A. Evans
@date   7th February 2017

@code

#include "mbed.h"
#include "N5110.h"

//      rows,cols
int sprite[8][5] =   {
    { 0,0,1,0,0 },
    { 0,1,1,1,0 },
    { 0,0,1,0,0 },
    { 0,1,1,1,0 },
    { 1,1,1,1,1 },
    { 1,1,1,1,1 },
    { 1,1,0,1,1 },
    { 1,1,0,1,1 },
};

//    VCC,SCE,RST,D/C,MOSI,SCLK,LED
//N5110 lcd(p7,p8,p9,p10,p11,p13,p21);  // LPC1768 - pwr from GPIO
N5110 lcd(p8,p9,p10,p11,p13,p21);  // LPC1768 - powered from +3V3 - JP1 in 2/3 position
//N5110 lcd(PTC9,PTC0,PTC7,PTD2,PTD1,PTC11);  // K64F - pwr from 3V3

int main()
{
    // first need to initialise display
    lcd.init();
    
    // change set contrast in range 0.0 to 1.0
    // 0.4 appears to be a good starting point
    lcd.setContrast(0.4);

    while(1) {

        // these are default settings so not strictly needed
        lcd.normalMode();      // normal colour mode
        lcd.setBrightness(0.5); // put LED backlight on 50%

        lcd.clear();
        // x origin, y origin, rows, cols, sprite
        lcd.drawSprite(20,6,8,5,(int *)sprite);
        lcd.refresh();
        wait(5.0);

        lcd.clear(); // clear buffer at start of every loop
        // can directly print strings at specified co-ordinates (must be less than 84 pixels to fit on display)
        lcd.printString("Hello, World!",0,0);

        char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
        // so can display a string of a maximum 14 characters in length
        // or create formatted strings - ensure they aren't more than 14 characters long
        int temperature = 27;
        int length = sprintf(buffer,"T = %2d C",temperature); // print formatted data to buffer
        // it is important the format specifier ensures the length will fit in the buffer
        if (length <= 14)  // if string will fit on display (assuming printing at x=0)
            lcd.printString(buffer,0,1);           // display on screen

        float pressure = 1012.3;  // same idea with floats
        length = sprintf(buffer,"P = %.2f mb",pressure);
        if (length <= 14)
            lcd.printString(buffer,0,2);

        // can also print individual characters at specified place
        lcd.printChar('X',5,3);

        // draw a line across the display at y = 40 pixels (origin top-left)
        for (int i = 0; i < WIDTH; i++) {
            lcd.setPixel(i,40,true);
        }
        // need to refresh display after setting pixels or writing strings
        lcd.refresh();
        wait(5.0);

        // can check status of pixel using getPixel(x,y);
        lcd.clear();  // clear buffer
        lcd.setPixel(2,2,true);  // set random pixel in buffer
        lcd.refresh();
        wait(1.0);

        int pixel_to_test = lcd.getPixel(2,2);

        if ( pixel_to_test ) {
            lcd.printString("2,2 is set",0,4);
        }

        // this one shouldn't be set
        lcd.setPixel(3,3,false);  // clear random pixel in buffer
        lcd.refresh();
        pixel_to_test = lcd.getPixel(3,3);

        if ( pixel_to_test == 0 ) {
            lcd.printString("3,3 is clear",0,5);
        }

        lcd.refresh();
        wait(4.0);

        lcd.clear();            // clear buffer
        lcd.inverseMode();      // invert colours
        lcd.setBrightness(1.0); // put LED backlight on full

        float array[84];

        for (int i = 0; i < 84; i++) {
            array[i] = 0.5 + 0.5*sin(i*2*3.14/84);
        }

        // can also plot graphs - 84 elements only
        // values must be in range 0.0 - 1.0
        lcd.plotArray(array);
        lcd.refresh();
        wait(5.0);

        lcd.clear();
        lcd.normalMode();      // normal colour mode back
        lcd.setBrightness(0.5); // put LED backlight on 50%

        // example of drawing lines
        for (int x = 0; x < WIDTH ; x+=10) {
            // x0,y0,x1,y1,type 0-white,1-black,2-dotted
            lcd.drawLine(0,0,x,HEIGHT,2);
        }
        lcd.refresh();  // refresh after drawing shapes
        wait(5.0);


        lcd.clear();
        // example of how to draw circles
        lcd.drawCircle(WIDTH/2,HEIGHT/2,20,FILL_BLACK);  // x,y,radius,black fill
        lcd.drawCircle(WIDTH/2,HEIGHT/2,10,FILL_WHITE);  // x,y,radius,white fill
        lcd.drawCircle(WIDTH/2,HEIGHT/2,30,FILL_TRANSPARENT);  // x,y,radius,transparent with outline
        lcd.refresh();  // refresh after drawing shapes
        wait(5.0);

        lcd.clear();
        // example of how to draw rectangles
        //          origin x,y,width,height,type
        lcd.drawRect(10,10,50,30,FILL_BLACK);  // filled black rectangle
        lcd.drawRect(15,15,20,10,FILL_WHITE);  // filled white rectange (no outline)
        lcd.drawRect(2,2,70,40,FILL_TRANSPARENT);    // transparent, just outline
        lcd.refresh();  // refresh after drawing shapes
        wait(5.0);

    }
}


@endcode
*/
class N5110
{
private:
// objects
    SPI         *_spi;
    PwmOut      *_led;
    DigitalOut  *_pwr;
    DigitalOut  *_sce;
    DigitalOut  *_rst;
    DigitalOut  *_dc;

// variables
    unsigned char buffer[84][6];  // screen buffer - the 6 is for the banks - each one is 8 bits;
    char screen_array[48][84];

public:
    /** Create a N5110 object connected to the specified pins
    *
    * @param pwr  Pin connected to Vcc on the LCD display (pin 1)
    * @param sce  Pin connected to chip enable (pin 3)
    * @param rst  Pin connected to reset (pin 4)
    * @param dc   Pin connected to data/command select (pin 5)
    * @param mosi Pin connected to data input (MOSI) (pin 6)
    * @param sclk Pin connected to serial clock (SCLK) (pin 7)
    * @param led  Pin connected to LED backlight (must be PWM) (pin 8)
    *
    */
    N5110(PinName const pwrPin,
          PinName const scePin,
          PinName const rstPin,
          PinName const dcPin,
          PinName const mosiPin,
          PinName const sclkPin,
          PinName const ledPin);

    /** Create a N5110 object connected to the specified pins (Vcc to +3V3)
    *
    * @param sce  Pin connected to chip enable (pin 3)
    * @param rst  Pin connected to reset (pin 4)
    * @param dc   Pin connected to data/command select (pin 5)
    * @param mosi Pin connected to data input (MOSI) (pin 6)
    * @param sclk Pin connected to serial clock (SCLK) (pin 7)
    * @param led  Pin connected to LED backlight (must be PWM) (pin 8)
    *
    */
    N5110(PinName const scePin,
          PinName const rstPin,
          PinName const dcPin,
          PinName const mosiPin,
          PinName const sclkPin,
          PinName const ledPin);

    /**
     * Free allocated memory when object goes out of scope
     */
    ~N5110();

    /** Initialise display
    *
    *   Powers up the display and turns on backlight (50% brightness default).
    *   Sets the display up in horizontal addressing mode and with normal video mode.
    */
    void init();

    /** Turn off
    *
    *   Powers down the display and turns of the backlight.
    *   Needs to be reinitialised before being re-used.
    */
    void turnOff();

    /** Clear
    *
    *   Clears the screen buffer.
    */
    void clear();

    /** Set screen constrast
    *   @param constrast - float in range 0.0 to 1.0 (0.40 to 0.60 is usually a good value)
    */
    void setContrast(float contrast);
    
    /** Turn on normal video mode (default)
    *  Black on white
    */
    void normalMode();

    /** Turn on inverse video mode (default)
    *  White on black
    */
    void inverseMode();

    /** Set Brightness
    *
    *   Sets brightness of LED backlight.
    *   @param brightness - float in range 0.0 to 1.0
    */
    void setBrightness(float const brightness);

    /** Print String
    *
    *   Prints a string of characters to the screen buffer. String is cut-off after the 83rd pixel.
    *   @param x - the column number (0 to 83)
    *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
    */
    void printString(char const         *str,
                     unsigned int const  x,
                     unsigned int const  y);

    /** Print Character
    *
    *   Sends a character to the screen buffer.  Printed at the specified location. Character is cut-off after the 83rd pixel.
    *   @param  c - the character to print. Can print ASCII as so printChar('C').
    *   @param x - the column number (0 to 83)
    *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
    */
    void printChar(char const         c,
                   unsigned int const x,
                   unsigned int const y);

    /**
    * @brief Set a Pixel
    *
    * @param x     The x co-ordinate of the pixel (0 to 83)
    * @param y     The y co-ordinate of the pixel (0 to 47)
    * @param state The state of the pixel [true=black (default), false=white]
    *
    * @details This function sets the state of a pixel in the screen buffer.
    *          The third parameter can be omitted,
    */
    void setPixel(unsigned int const x,
                  unsigned int const y,
                  bool const         state = true);

    /**
    *  @brief Clear a Pixel
    *
    *   @param  x - the x co-ordinate of the pixel (0 to 83)
    *   @param  y - the y co-ordinate of the pixel (0 to 47)
    *
    *   @details This function clears pixel in the screen buffer
    *
    *   @deprecated Use setPixel(x, y, false) instead
    */
    void clearPixel(unsigned int const x,
                    unsigned int const y)
    __attribute__((deprecated("Use setPixel(x,y,false) instead")));

    /** Get a Pixel
    *
    *   This function gets the status of a pixel in the screen buffer.
    *   @param  x - the x co-ordinate of the pixel (0 to 83)
    *   @param  y - the y co-ordinate of the pixel (0 to 47)
    *   @returns
    *       0           - pixel is clear
    *       1    - pixel is set
    */
    int getPixel(unsigned int const x,
                 unsigned int const y) const;

    /** Refresh display
    *
    *   This functions sends the screen buffer to the display.
    */
    void refresh();

    /** Randomise buffer
    *
    *   This function fills the buffer with random data.  Can be used to test the display.
    *   A call to refresh() must be made to update the display to reflect the change in pixels.
    *   The seed is not set and so the generated pattern will probably be the same each time.
    *   TODO: Randomise the seed - maybe using the noise on the AnalogIn pins.
    */
    void randomiseBuffer();

    /** Plot Array
    *
    *   This function plots a one-dimensional array in the buffer.
    *   @param array[] - y values of the plot. Values should be normalised in the range 0.0 to 1.0. First 84 plotted.
    */
    void plotArray(float const array[]);

    /** Draw Circle
    *
    *   This function draws a circle at the specified origin with specified radius in the screen buffer
    *   Uses the midpoint circle algorithm.
    *   @see http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
    *   @param  x0     - x-coordinate of centre
    *   @param  y0     - y-coordinate of centre
    *   @param  radius - radius of circle in pixels
    *   @param  fill   - fill-type for the shape
    */
    void drawCircle(unsigned int const x0,
                    unsigned int const y0,
                    unsigned int const radius,
                    FillType const     fill);

    /** Draw Line
    *
    *   This function draws a line between the specified points using linear interpolation.
    *   @param  x0 - x-coordinate of first point
    *   @param  y0 - y-coordinate of first point
    *   @param  x1 - x-coordinate of last point
    *   @param  y1 - y-coordinate of last point
    *   @param  type - 0 white,1 black,2 dotted
    */
    void drawLine(unsigned int const x0,
                  unsigned int const y0,
                  unsigned int const x1,
                  unsigned int const y1,
                  unsigned int const type);

    /** Draw Rectangle
    *
    *   This function draws a rectangle.
    *   @param  x0 - x-coordinate of origin (top-left)
    *   @param  y0 - y-coordinate of origin (top-left)
    *   @param  width - width of rectangle
    *   @param  height - height of rectangle
    *   @param  fill   - fill-type for the shape
    */
    void drawRect(unsigned int const x0,
                  unsigned int const y0,
                  unsigned int const width,
                  unsigned int const height,
                  FillType const     fill);

    /** Draw Sprite
    *
    *   This function draws a sprite as defined in a 2D array
    *   @param  x0 - x-coordinate of origin (top-left)
    *   @param  y0 - y-coordinate of origin (top-left)
    *   @param  nrows - number of rows in sprite
    *   @param  ncols - number of columns in sprite
    *   @param  sprite - 2D array representing the sprite
    */
    void drawSprite(int x0,
                    int y0,
                    int nrows,
                    int ncols,
                    char *sprite);
    
    void drawSpriteTransparent(int x0,
                               int y0,
                               int nrows,
                               int ncols,
                               char *sprite);
                               
    char * readScreen();


private:
// methods
    void setXYAddress(unsigned int const x,
                      unsigned int const y);
    void initSPI();
    void turnOn();
    void reset();
    void clearRAM();
    void sendCommand(unsigned char command);
    void sendData(unsigned char data);
    void setTempCoefficient(char tc);  // 0 to 3
    void setBias(char bias);  // 0 to 7
};

const unsigned char font5x7[480] = {
    0x00, 0x00, 0x00, 0x00, 0x00,// (space)
    0x00, 0x00, 0x5F, 0x00, 0x00,// !
    0x00, 0x07, 0x00, 0x07, 0x00,// "
    0x14, 0x7F, 0x14, 0x7F, 0x14,// #
    0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
    0x23, 0x13, 0x08, 0x64, 0x62,// %
    0x36, 0x49, 0x55, 0x22, 0x50,// &
    0x00, 0x05, 0x03, 0x00, 0x00,// '
    0x00, 0x1C, 0x22, 0x41, 0x00,// (
    0x00, 0x41, 0x22, 0x1C, 0x00,// )
    0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
    0x08, 0x08, 0x3E, 0x08, 0x08,// +
    0x00, 0x50, 0x30, 0x00, 0x00,// ,
    0x08, 0x08, 0x08, 0x08, 0x08,// -
    0x00, 0x60, 0x60, 0x00, 0x00,// .
    0x20, 0x10, 0x08, 0x04, 0x02,// /
    0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
    0x00, 0x42, 0x7F, 0x40, 0x00,// 1
    0x42, 0x61, 0x51, 0x49, 0x46,// 2
    0x21, 0x41, 0x45, 0x4B, 0x31,// 3
    0x18, 0x14, 0x12, 0x7F, 0x10,// 4
    0x27, 0x45, 0x45, 0x45, 0x39,// 5
    0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
    0x01, 0x71, 0x09, 0x05, 0x03,// 7
    0x36, 0x49, 0x49, 0x49, 0x36,// 8
    0x06, 0x49, 0x49, 0x29, 0x1E,// 9
    0x00, 0x36, 0x36, 0x00, 0x00,// :
    0x00, 0x56, 0x36, 0x00, 0x00,// ;
    0x00, 0x08, 0x14, 0x22, 0x41,// <
    0x14, 0x14, 0x14, 0x14, 0x14,// =
    0x41, 0x22, 0x14, 0x08, 0x00,// >
    0x02, 0x01, 0x51, 0x09, 0x06,// ?
    0x32, 0x49, 0x79, 0x41, 0x3E,// @
    0x7E, 0x11, 0x11, 0x11, 0x7E,// A
    0x7F, 0x49, 0x49, 0x49, 0x36,// B
    0x3E, 0x41, 0x41, 0x41, 0x22,// C
    0x7F, 0x41, 0x41, 0x22, 0x1C,// D
    0x7F, 0x49, 0x49, 0x49, 0x41,// E
    0x7F, 0x09, 0x09, 0x01, 0x01,// F
    0x3E, 0x41, 0x41, 0x51, 0x32,// G
    0x7F, 0x08, 0x08, 0x08, 0x7F,// H
    0x00, 0x41, 0x7F, 0x41, 0x00,// I
    0x20, 0x40, 0x41, 0x3F, 0x01,// J
    0x7F, 0x08, 0x14, 0x22, 0x41,// K
    0x7F, 0x40, 0x40, 0x40, 0x40,// L
    0x7F, 0x02, 0x04, 0x02, 0x7F,// M
    0x7F, 0x04, 0x08, 0x10, 0x7F,// N
    0x3E, 0x41, 0x41, 0x41, 0x3E,// O
    0x7F, 0x09, 0x09, 0x09, 0x06,// P
    0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
    0x7F, 0x09, 0x19, 0x29, 0x46,// R
    0x46, 0x49, 0x49, 0x49, 0x31,// S
    0x01, 0x01, 0x7F, 0x01, 0x01,// T
    0x3F, 0x40, 0x40, 0x40, 0x3F,// U
    0x1F, 0x20, 0x40, 0x20, 0x1F,// V
    0x7F, 0x20, 0x18, 0x20, 0x7F,// W
    0x63, 0x14, 0x08, 0x14, 0x63,// X
    0x03, 0x04, 0x78, 0x04, 0x03,// Y
    0x61, 0x51, 0x49, 0x45, 0x43,// Z
    0x00, 0x00, 0x7F, 0x41, 0x41,// [
    0x02, 0x04, 0x08, 0x10, 0x20,// "\"
    0x41, 0x41, 0x7F, 0x00, 0x00,// ]
    0x04, 0x02, 0x01, 0x02, 0x04,// ^
    0x40, 0x40, 0x40, 0x40, 0x40,// _
    0x00, 0x01, 0x02, 0x04, 0x00,// `
    0x20, 0x54, 0x54, 0x54, 0x78,// a
    0x7F, 0x48, 0x44, 0x44, 0x38,// b
    0x38, 0x44, 0x44, 0x44, 0x20,// c
    0x38, 0x44, 0x44, 0x48, 0x7F,// d
    0x38, 0x54, 0x54, 0x54, 0x18,// e
    0x08, 0x7E, 0x09, 0x01, 0x02,// f
    0x08, 0x14, 0x54, 0x54, 0x3C,// g
    0x7F, 0x08, 0x04, 0x04, 0x78,// h
    0x00, 0x44, 0x7D, 0x40, 0x00,// i
    0x20, 0x40, 0x44, 0x3D, 0x00,// j
    0x00, 0x7F, 0x10, 0x28, 0x44,// k
    0x00, 0x41, 0x7F, 0x40, 0x00,// l
    0x7C, 0x04, 0x18, 0x04, 0x78,// m
    0x7C, 0x08, 0x04, 0x04, 0x78,// n
    0x38, 0x44, 0x44, 0x44, 0x38,// o
    0x7C, 0x14, 0x14, 0x14, 0x08,// p
    0x08, 0x14, 0x14, 0x18, 0x7C,// q
    0x7C, 0x08, 0x04, 0x04, 0x08,// r
    0x48, 0x54, 0x54, 0x54, 0x20,// s
    0x04, 0x3F, 0x44, 0x40, 0x20,// t
    0x3C, 0x40, 0x40, 0x20, 0x7C,// u
    0x1C, 0x20, 0x40, 0x20, 0x1C,// v
    0x3C, 0x40, 0x30, 0x40, 0x3C,// w
    0x44, 0x28, 0x10, 0x28, 0x44,// x
    0x0C, 0x50, 0x50, 0x50, 0x3C,// y
    0x44, 0x64, 0x54, 0x4C, 0x44,// z
    0x00, 0x08, 0x36, 0x41, 0x00,// {
    0x00, 0x00, 0x7F, 0x00, 0x00,// |
    0x00, 0x41, 0x36, 0x08, 0x00,// }
    0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
    0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
};

#endif