N5110.h

00001 #ifndef N5110_H
00002 #define N5110_H
00003 
00004 #include "mbed.h"
00005 
00006 // number of pixels on display
00007 #define WIDTH 84
00008 #define HEIGHT 48
00009 #define BANKS 6
00010 
00011 /// Fill types for 2D shapes
00012 enum FillType {
00013     FILL_TRANSPARENT, ///< Transparent with outline
00014     FILL_BLACK,       ///< Filled black
00015     FILL_WHITE,       ///< Filled white (no outline)
00016 };
00017 
00018 /** N5110 Class
00019 @brief Library for interfacing with Nokia 5110 LCD display (https://www.sparkfun.com/products/10168) using the hardware SPI on the mbed.
00020 @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).
00021 @brief Can print characters and strings to the display using the included 5x7 font.
00022 @brief The library also implements a screen buffer so that individual pixels on the display (84 x 48) can be set, cleared and read.
00023 @brief The library can print primitive shapes (lines, circles, rectangles)
00024 @brief Acknowledgements to Chris Yan's Nokia_5110 Library.
00025 
00026 @brief Revision 1.3
00027 
00028 @author Craig A. Evans
00029 @date   7th February 2017
00030 
00031 @code
00032 
00033 #include "mbed.h"
00034 #include "N5110.h"
00035 
00036 //      rows,cols
00037 int sprite[8][5] =   {
00038     { 0,0,1,0,0 },
00039     { 0,1,1,1,0 },
00040     { 0,0,1,0,0 },
00041     { 0,1,1,1,0 },
00042     { 1,1,1,1,1 },
00043     { 1,1,1,1,1 },
00044     { 1,1,0,1,1 },
00045     { 1,1,0,1,1 },
00046 };
00047 
00048 //    VCC,SCE,RST,D/C,MOSI,SCLK,LED
00049 //N5110 lcd(p7,p8,p9,p10,p11,p13,p21);  // LPC1768 - pwr from GPIO
00050 N5110 lcd(p8,p9,p10,p11,p13,p21);  // LPC1768 - powered from +3V3 - JP1 in 2/3 position
00051 //N5110 lcd(PTC9,PTC0,PTC7,PTD2,PTD1,PTC11);  // K64F - pwr from 3V3
00052 
00053 int main()
00054 {
00055     // first need to initialise display
00056     lcd.init();
00057     
00058     // change set contrast in range 0.0 to 1.0
00059     // 0.4 appears to be a good starting point
00060     lcd.setContrast(0.4);
00061 
00062     while(1) {
00063 
00064         // these are default settings so not strictly needed
00065         lcd.normalMode();      // normal colour mode
00066         lcd.setBrightness(0.5); // put LED backlight on 50%
00067 
00068         lcd.clear();
00069         // x origin, y origin, rows, cols, sprite
00070         lcd.drawSprite(20,6,8,5,(int *)sprite);
00071         lcd.refresh();
00072         wait(5.0);
00073 
00074         lcd.clear(); // clear buffer at start of every loop
00075         // can directly print strings at specified co-ordinates (must be less than 84 pixels to fit on display)
00076         lcd.printString("Hello, World!",0,0);
00077 
00078         char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
00079         // so can display a string of a maximum 14 characters in length
00080         // or create formatted strings - ensure they aren't more than 14 characters long
00081         int temperature = 27;
00082         int length = sprintf(buffer,"T = %2d C",temperature); // print formatted data to buffer
00083         // it is important the format specifier ensures the length will fit in the buffer
00084         if (length <= 14)  // if string will fit on display (assuming printing at x=0)
00085             lcd.printString(buffer,0,1);           // display on screen
00086 
00087         float pressure = 1012.3;  // same idea with floats
00088         length = sprintf(buffer,"P = %.2f mb",pressure);
00089         if (length <= 14)
00090             lcd.printString(buffer,0,2);
00091 
00092         // can also print individual characters at specified place
00093         lcd.printChar('X',5,3);
00094 
00095         // draw a line across the display at y = 40 pixels (origin top-left)
00096         for (int i = 0; i < WIDTH; i++) {
00097             lcd.setPixel(i,40,true);
00098         }
00099         // need to refresh display after setting pixels or writing strings
00100         lcd.refresh();
00101         wait(5.0);
00102 
00103         // can check status of pixel using getPixel(x,y);
00104         lcd.clear();  // clear buffer
00105         lcd.setPixel(2,2,true);  // set random pixel in buffer
00106         lcd.refresh();
00107         wait(1.0);
00108 
00109         int pixel_to_test = lcd.getPixel(2,2);
00110 
00111         if ( pixel_to_test ) {
00112             lcd.printString("2,2 is set",0,4);
00113         }
00114 
00115         // this one shouldn't be set
00116         lcd.setPixel(3,3,false);  // clear random pixel in buffer
00117         lcd.refresh();
00118         pixel_to_test = lcd.getPixel(3,3);
00119 
00120         if ( pixel_to_test == 0 ) {
00121             lcd.printString("3,3 is clear",0,5);
00122         }
00123 
00124         lcd.refresh();
00125         wait(4.0);
00126 
00127         lcd.clear();            // clear buffer
00128         lcd.inverseMode();      // invert colours
00129         lcd.setBrightness(1.0); // put LED backlight on full
00130 
00131         float array[84];
00132 
00133         for (int i = 0; i < 84; i++) {
00134             array[i] = 0.5 + 0.5*sin(i*2*3.14/84);
00135         }
00136 
00137         // can also plot graphs - 84 elements only
00138         // values must be in range 0.0 - 1.0
00139         lcd.plotArray(array);
00140         lcd.refresh();
00141         wait(5.0);
00142 
00143         lcd.clear();
00144         lcd.normalMode();      // normal colour mode back
00145         lcd.setBrightness(0.5); // put LED backlight on 50%
00146 
00147         // example of drawing lines
00148         for (int x = 0; x < WIDTH ; x+=10) {
00149             // x0,y0,x1,y1,type 0-white,1-black,2-dotted
00150             lcd.drawLine(0,0,x,HEIGHT,2);
00151         }
00152         lcd.refresh();  // refresh after drawing shapes
00153         wait(5.0);
00154 
00155 
00156         lcd.clear();
00157         // example of how to draw circles
00158         lcd.drawCircle(WIDTH/2,HEIGHT/2,20,FILL_BLACK);  // x,y,radius,black fill
00159         lcd.drawCircle(WIDTH/2,HEIGHT/2,10,FILL_WHITE);  // x,y,radius,white fill
00160         lcd.drawCircle(WIDTH/2,HEIGHT/2,30,FILL_TRANSPARENT);  // x,y,radius,transparent with outline
00161         lcd.refresh();  // refresh after drawing shapes
00162         wait(5.0);
00163 
00164         lcd.clear();
00165         // example of how to draw rectangles
00166         //          origin x,y,width,height,type
00167         lcd.drawRect(10,10,50,30,FILL_BLACK);  // filled black rectangle
00168         lcd.drawRect(15,15,20,10,FILL_WHITE);  // filled white rectange (no outline)
00169         lcd.drawRect(2,2,70,40,FILL_TRANSPARENT);    // transparent, just outline
00170         lcd.refresh();  // refresh after drawing shapes
00171         wait(5.0);
00172 
00173     }
00174 }
00175 
00176 
00177 @endcode
00178 */
00179 class N5110
00180 {
00181 private:
00182 // objects
00183     SPI         *_spi;
00184     PwmOut      *_led;
00185     DigitalOut  *_pwr;
00186     DigitalOut  *_sce;
00187     DigitalOut  *_rst;
00188     DigitalOut  *_dc;
00189 
00190 // variables
00191     unsigned char buffer[84][6];  // screen buffer - the 6 is for the banks - each one is 8 bits;
00192     char screen_array[48][84];
00193 
00194 public:
00195     /** Create a N5110 object connected to the specified pins
00196     *
00197     * @param pwr  Pin connected to Vcc on the LCD display (pin 1)
00198     * @param sce  Pin connected to chip enable (pin 3)
00199     * @param rst  Pin connected to reset (pin 4)
00200     * @param dc   Pin connected to data/command select (pin 5)
00201     * @param mosi Pin connected to data input (MOSI) (pin 6)
00202     * @param sclk Pin connected to serial clock (SCLK) (pin 7)
00203     * @param led  Pin connected to LED backlight (must be PWM) (pin 8)
00204     *
00205     */
00206     N5110(PinName const pwrPin,
00207           PinName const scePin,
00208           PinName const rstPin,
00209           PinName const dcPin,
00210           PinName const mosiPin,
00211           PinName const sclkPin,
00212           PinName const ledPin);
00213 
00214     /** Create a N5110 object connected to the specified pins (Vcc to +3V3)
00215     *
00216     * @param sce  Pin connected to chip enable (pin 3)
00217     * @param rst  Pin connected to reset (pin 4)
00218     * @param dc   Pin connected to data/command select (pin 5)
00219     * @param mosi Pin connected to data input (MOSI) (pin 6)
00220     * @param sclk Pin connected to serial clock (SCLK) (pin 7)
00221     * @param led  Pin connected to LED backlight (must be PWM) (pin 8)
00222     *
00223     */
00224     N5110(PinName const scePin,
00225           PinName const rstPin,
00226           PinName const dcPin,
00227           PinName const mosiPin,
00228           PinName const sclkPin,
00229           PinName const ledPin);
00230 
00231     /**
00232      * Free allocated memory when object goes out of scope
00233      */
00234     ~N5110();
00235 
00236     /** Initialise display
00237     *
00238     *   Powers up the display and turns on backlight (50% brightness default).
00239     *   Sets the display up in horizontal addressing mode and with normal video mode.
00240     */
00241     void init();
00242 
00243     /** Turn off
00244     *
00245     *   Powers down the display and turns of the backlight.
00246     *   Needs to be reinitialised before being re-used.
00247     */
00248     void turnOff();
00249 
00250     /** Clear
00251     *
00252     *   Clears the screen buffer.
00253     */
00254     void clear();
00255 
00256     /** Set screen constrast
00257     *   @param constrast - float in range 0.0 to 1.0 (0.40 to 0.60 is usually a good value)
00258     */
00259     void setContrast(float contrast);
00260     
00261     /** Turn on normal video mode (default)
00262     *  Black on white
00263     */
00264     void normalMode();
00265 
00266     /** Turn on inverse video mode (default)
00267     *  White on black
00268     */
00269     void inverseMode();
00270 
00271     /** Set Brightness
00272     *
00273     *   Sets brightness of LED backlight.
00274     *   @param brightness - float in range 0.0 to 1.0
00275     */
00276     void setBrightness(float const brightness);
00277 
00278     /** Print String
00279     *
00280     *   Prints a string of characters to the screen buffer. String is cut-off after the 83rd pixel.
00281     *   @param x - the column number (0 to 83)
00282     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00283     */
00284     void printString(char const         *str,
00285                      unsigned int const  x,
00286                      unsigned int const  y);
00287 
00288     /** Print Character
00289     *
00290     *   Sends a character to the screen buffer.  Printed at the specified location. Character is cut-off after the 83rd pixel.
00291     *   @param  c - the character to print. Can print ASCII as so printChar('C').
00292     *   @param x - the column number (0 to 83)
00293     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00294     */
00295     void printChar(char const         c,
00296                    unsigned int const x,
00297                    unsigned int const y);
00298 
00299     /**
00300     * @brief Set a Pixel
00301     *
00302     * @param x     The x co-ordinate of the pixel (0 to 83)
00303     * @param y     The y co-ordinate of the pixel (0 to 47)
00304     * @param state The state of the pixel [true=black (default), false=white]
00305     *
00306     * @details This function sets the state of a pixel in the screen buffer.
00307     *          The third parameter can be omitted,
00308     */
00309     void setPixel(unsigned int const x,
00310                   unsigned int const y,
00311                   bool const         state = true);
00312 
00313     /**
00314     *  @brief Clear a Pixel
00315     *
00316     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00317     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00318     *
00319     *   @details This function clears pixel in the screen buffer
00320     *
00321     *   @deprecated Use setPixel(x, y, false) instead
00322     */
00323     void clearPixel(unsigned int const x,
00324                     unsigned int const y)
00325     __attribute__((deprecated("Use setPixel(x,y,false) instead")));
00326 
00327     /** Get a Pixel
00328     *
00329     *   This function gets the status of a pixel in the screen buffer.
00330     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00331     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00332     *   @returns
00333     *       0           - pixel is clear
00334     *       1    - pixel is set
00335     */
00336     int getPixel(unsigned int const x,
00337                  unsigned int const y) const;
00338 
00339     /** Refresh display
00340     *
00341     *   This functions sends the screen buffer to the display.
00342     */
00343     void refresh();
00344 
00345     /** Randomise buffer
00346     *
00347     *   This function fills the buffer with random data.  Can be used to test the display.
00348     *   A call to refresh() must be made to update the display to reflect the change in pixels.
00349     *   The seed is not set and so the generated pattern will probably be the same each time.
00350     *   TODO: Randomise the seed - maybe using the noise on the AnalogIn pins.
00351     */
00352     void randomiseBuffer();
00353 
00354     /** Plot Array
00355     *
00356     *   This function plots a one-dimensional array in the buffer.
00357     *   @param array[] - y values of the plot. Values should be normalised in the range 0.0 to 1.0. First 84 plotted.
00358     */
00359     void plotArray(float const array[]);
00360 
00361     /** Draw Circle
00362     *
00363     *   This function draws a circle at the specified origin with specified radius in the screen buffer
00364     *   Uses the midpoint circle algorithm.
00365     *   @see http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
00366     *   @param  x0     - x-coordinate of centre
00367     *   @param  y0     - y-coordinate of centre
00368     *   @param  radius - radius of circle in pixels
00369     *   @param  fill   - fill-type for the shape
00370     */
00371     void drawCircle(unsigned int const x0,
00372                     unsigned int const y0,
00373                     unsigned int const radius,
00374                     FillType const     fill);
00375 
00376     /** Draw Line
00377     *
00378     *   This function draws a line between the specified points using linear interpolation.
00379     *   @param  x0 - x-coordinate of first point
00380     *   @param  y0 - y-coordinate of first point
00381     *   @param  x1 - x-coordinate of last point
00382     *   @param  y1 - y-coordinate of last point
00383     *   @param  type - 0 white,1 black,2 dotted
00384     */
00385     void drawLine(unsigned int const x0,
00386                   unsigned int const y0,
00387                   unsigned int const x1,
00388                   unsigned int const y1,
00389                   unsigned int const type);
00390 
00391     /** Draw Rectangle
00392     *
00393     *   This function draws a rectangle.
00394     *   @param  x0 - x-coordinate of origin (top-left)
00395     *   @param  y0 - y-coordinate of origin (top-left)
00396     *   @param  width - width of rectangle
00397     *   @param  height - height of rectangle
00398     *   @param  fill   - fill-type for the shape
00399     */
00400     void drawRect(unsigned int const x0,
00401                   unsigned int const y0,
00402                   unsigned int const width,
00403                   unsigned int const height,
00404                   FillType const     fill);
00405 
00406     /** Draw Sprite
00407     *
00408     *   This function draws a sprite as defined in a 2D array
00409     *   @param  x0 - x-coordinate of origin (top-left)
00410     *   @param  y0 - y-coordinate of origin (top-left)
00411     *   @param  nrows - number of rows in sprite
00412     *   @param  ncols - number of columns in sprite
00413     *   @param  sprite - 2D array representing the sprite
00414     */
00415     void drawSprite(int x0,
00416                     int y0,
00417                     int nrows,
00418                     int ncols,
00419                     char *sprite);
00420     
00421     void drawSpriteTransparent(int x0,
00422                                int y0,
00423                                int nrows,
00424                                int ncols,
00425                                char *sprite);
00426                                
00427     char * readScreen();
00428 
00429 
00430 private:
00431 // methods
00432     void setXYAddress(unsigned int const x,
00433                       unsigned int const y);
00434     void initSPI();
00435     void turnOn();
00436     void reset();
00437     void clearRAM();
00438     void sendCommand(unsigned char command);
00439     void sendData(unsigned char data);
00440     void setTempCoefficient(char tc);  // 0 to 3
00441     void setBias(char bias);  // 0 to 7
00442 };
00443 
00444 const unsigned char font5x7[480] = {
00445     0x00, 0x00, 0x00, 0x00, 0x00,// (space)
00446     0x00, 0x00, 0x5F, 0x00, 0x00,// !
00447     0x00, 0x07, 0x00, 0x07, 0x00,// "
00448     0x14, 0x7F, 0x14, 0x7F, 0x14,// #
00449     0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
00450     0x23, 0x13, 0x08, 0x64, 0x62,// %
00451     0x36, 0x49, 0x55, 0x22, 0x50,// &
00452     0x00, 0x05, 0x03, 0x00, 0x00,// '
00453     0x00, 0x1C, 0x22, 0x41, 0x00,// (
00454     0x00, 0x41, 0x22, 0x1C, 0x00,// )
00455     0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
00456     0x08, 0x08, 0x3E, 0x08, 0x08,// +
00457     0x00, 0x50, 0x30, 0x00, 0x00,// ,
00458     0x08, 0x08, 0x08, 0x08, 0x08,// -
00459     0x00, 0x60, 0x60, 0x00, 0x00,// .
00460     0x20, 0x10, 0x08, 0x04, 0x02,// /
00461     0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
00462     0x00, 0x42, 0x7F, 0x40, 0x00,// 1
00463     0x42, 0x61, 0x51, 0x49, 0x46,// 2
00464     0x21, 0x41, 0x45, 0x4B, 0x31,// 3
00465     0x18, 0x14, 0x12, 0x7F, 0x10,// 4
00466     0x27, 0x45, 0x45, 0x45, 0x39,// 5
00467     0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
00468     0x01, 0x71, 0x09, 0x05, 0x03,// 7
00469     0x36, 0x49, 0x49, 0x49, 0x36,// 8
00470     0x06, 0x49, 0x49, 0x29, 0x1E,// 9
00471     0x00, 0x36, 0x36, 0x00, 0x00,// :
00472     0x00, 0x56, 0x36, 0x00, 0x00,// ;
00473     0x00, 0x08, 0x14, 0x22, 0x41,// <
00474     0x14, 0x14, 0x14, 0x14, 0x14,// =
00475     0x41, 0x22, 0x14, 0x08, 0x00,// >
00476     0x02, 0x01, 0x51, 0x09, 0x06,// ?
00477     0x32, 0x49, 0x79, 0x41, 0x3E,// @
00478     0x7E, 0x11, 0x11, 0x11, 0x7E,// A
00479     0x7F, 0x49, 0x49, 0x49, 0x36,// B
00480     0x3E, 0x41, 0x41, 0x41, 0x22,// C
00481     0x7F, 0x41, 0x41, 0x22, 0x1C,// D
00482     0x7F, 0x49, 0x49, 0x49, 0x41,// E
00483     0x7F, 0x09, 0x09, 0x01, 0x01,// F
00484     0x3E, 0x41, 0x41, 0x51, 0x32,// G
00485     0x7F, 0x08, 0x08, 0x08, 0x7F,// H
00486     0x00, 0x41, 0x7F, 0x41, 0x00,// I
00487     0x20, 0x40, 0x41, 0x3F, 0x01,// J
00488     0x7F, 0x08, 0x14, 0x22, 0x41,// K
00489     0x7F, 0x40, 0x40, 0x40, 0x40,// L
00490     0x7F, 0x02, 0x04, 0x02, 0x7F,// M
00491     0x7F, 0x04, 0x08, 0x10, 0x7F,// N
00492     0x3E, 0x41, 0x41, 0x41, 0x3E,// O
00493     0x7F, 0x09, 0x09, 0x09, 0x06,// P
00494     0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
00495     0x7F, 0x09, 0x19, 0x29, 0x46,// R
00496     0x46, 0x49, 0x49, 0x49, 0x31,// S
00497     0x01, 0x01, 0x7F, 0x01, 0x01,// T
00498     0x3F, 0x40, 0x40, 0x40, 0x3F,// U
00499     0x1F, 0x20, 0x40, 0x20, 0x1F,// V
00500     0x7F, 0x20, 0x18, 0x20, 0x7F,// W
00501     0x63, 0x14, 0x08, 0x14, 0x63,// X
00502     0x03, 0x04, 0x78, 0x04, 0x03,// Y
00503     0x61, 0x51, 0x49, 0x45, 0x43,// Z
00504     0x00, 0x00, 0x7F, 0x41, 0x41,// [
00505     0x02, 0x04, 0x08, 0x10, 0x20,// "\"
00506     0x41, 0x41, 0x7F, 0x00, 0x00,// ]
00507     0x04, 0x02, 0x01, 0x02, 0x04,// ^
00508     0x40, 0x40, 0x40, 0x40, 0x40,// _
00509     0x00, 0x01, 0x02, 0x04, 0x00,// `
00510     0x20, 0x54, 0x54, 0x54, 0x78,// a
00511     0x7F, 0x48, 0x44, 0x44, 0x38,// b
00512     0x38, 0x44, 0x44, 0x44, 0x20,// c
00513     0x38, 0x44, 0x44, 0x48, 0x7F,// d
00514     0x38, 0x54, 0x54, 0x54, 0x18,// e
00515     0x08, 0x7E, 0x09, 0x01, 0x02,// f
00516     0x08, 0x14, 0x54, 0x54, 0x3C,// g
00517     0x7F, 0x08, 0x04, 0x04, 0x78,// h
00518     0x00, 0x44, 0x7D, 0x40, 0x00,// i
00519     0x20, 0x40, 0x44, 0x3D, 0x00,// j
00520     0x00, 0x7F, 0x10, 0x28, 0x44,// k
00521     0x00, 0x41, 0x7F, 0x40, 0x00,// l
00522     0x7C, 0x04, 0x18, 0x04, 0x78,// m
00523     0x7C, 0x08, 0x04, 0x04, 0x78,// n
00524     0x38, 0x44, 0x44, 0x44, 0x38,// o
00525     0x7C, 0x14, 0x14, 0x14, 0x08,// p
00526     0x08, 0x14, 0x14, 0x18, 0x7C,// q
00527     0x7C, 0x08, 0x04, 0x04, 0x08,// r
00528     0x48, 0x54, 0x54, 0x54, 0x20,// s
00529     0x04, 0x3F, 0x44, 0x40, 0x20,// t
00530     0x3C, 0x40, 0x40, 0x20, 0x7C,// u
00531     0x1C, 0x20, 0x40, 0x20, 0x1C,// v
00532     0x3C, 0x40, 0x30, 0x40, 0x3C,// w
00533     0x44, 0x28, 0x10, 0x28, 0x44,// x
00534     0x0C, 0x50, 0x50, 0x50, 0x3C,// y
00535     0x44, 0x64, 0x54, 0x4C, 0x44,// z
00536     0x00, 0x08, 0x36, 0x41, 0x00,// {
00537     0x00, 0x00, 0x7F, 0x00, 0x00,// |
00538     0x00, 0x41, 0x36, 0x08, 0x00,// }
00539     0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
00540     0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
00541 };
00542 
00543 #endif