N5110.h

00001 #ifndef N5110_H
00002 #define N5110_H
00003 
00004 #include "mbed.h"
00005 
00006 // Command Bytes - taken from Chris Yan's library
00007 // More information can be found in the display datasheet
00008 // H = 0 - Basic instructions
00009 #define CMD_DC_CLEAR_DISPLAY   0x08
00010 #define CMD_DC_NORMAL_MODE     0x0C
00011 #define CMD_DC_FILL_DISPLAY    0x09
00012 #define CMD_DC_INVERT_VIDEO    0x0D
00013 #define CMD_FS_HORIZONTAL_MODE 0x00
00014 #define CMD_FS_VERTICAL_MODE   0x02
00015 #define CMD_FS_BASIC_MODE      0x00
00016 #define CMD_FS_EXTENDED_MODE   0x01
00017 #define CMD_FS_ACTIVE_MODE     0x00
00018 #define CMD_FS_POWER_DOWN_MODE 0x04
00019 // H = 1 - Extended instructions
00020 #define CMD_TC_TEMP_0          0x04
00021 #define CMD_TC_TEMP_1          0x05
00022 #define CMD_TC_TEMP_2          0x06
00023 #define CMD_TC_TEMP_3          0x07
00024 #define CMD_BI_MUX_24          0x15
00025 #define CMD_BI_MUX_48          0x13
00026 #define CMD_BI_MUX_100         0x10
00027 #define CMD_VOP_6V06           0xB2
00028 #define CMD_VOP_7V38           0xC8
00029 
00030 // number of pixels on display
00031 #define WIDTH 84
00032 #define HEIGHT 48
00033 #define BANKS 6
00034 
00035 /// Fill types for 2D shapes
00036 enum FillType {
00037     FILL_TRANSPARENT, ///< Transparent with outline
00038     FILL_BLACK,       ///< Filled black
00039     FILL_WHITE,       ///< Filled white (no outline)
00040 };
00041 
00042 /** N5110 Class
00043 @brief Library for interfacing with Nokia 5110 LCD display (https://www.sparkfun.com/products/10168) using the hardware SPI on the mbed.
00044 @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).
00045 @brief Can print characters and strings to the display using the included 5x7 font.
00046 @brief The library also implements a screen buffer so that individual pixels on the display (84 x 48) can be set, cleared and read.
00047 @brief The library can print primitive shapes (lines, circles, rectangles)
00048 @brief Acknowledgements to Chris Yan's Nokia_5110 Library.
00049 
00050 @brief Revision 1.3
00051 
00052 @author Craig A. Evans
00053 @date   7th February 2017
00054 
00055 @code
00056 
00057 #include "mbed.h"
00058 #include "N5110.h"
00059 
00060 //    VCC,SCE,RST,D/C,MOSI,SCLK,LED
00061 //N5110 lcd(p7,p8,p9,p10,p11,p13,p21);  // LPC1768 - pwr from GPIO
00062 N5110 lcd(PTC9,PTC0,PTC7,PTD2,PTD1,PTC11);  // K64F - pwr from 3V3
00063 
00064 int main()
00065 {
00066     // first need to initialise display
00067     lcd.init();
00068 
00069     while(1) {
00070 
00071         // these are default settings so not strictly needed
00072         lcd.normalMode();      // normal colour mode
00073         lcd.setBrightness(0.5); // put LED backlight on 50%
00074 
00075         lcd.clear(); // clear buffer at start of every loop
00076         // can directly print strings at specified co-ordinates (must be less than 84 pixels to fit on display)
00077         lcd.printString("Hello, World!",0,0);
00078 
00079         char buffer[14];  // each character is 6 pixels wide, screen is 84 pixels (84/6 = 14)
00080         // so can display a string of a maximum 14 characters in length
00081         // or create formatted strings - ensure they aren't more than 14 characters long
00082         int temperature = 27;
00083         int length = sprintf(buffer,"T = %2d C",temperature); // print formatted data to buffer
00084         // it is important the format specifier ensures the length will fit in the buffer
00085         if (length <= 14)  // if string will fit on display (assuming printing at x=0)
00086             lcd.printString(buffer,0,1);           // display on screen
00087 
00088         float pressure = 1012.3;  // same idea with floats
00089         length = sprintf(buffer,"P = %.2f mb",pressure);
00090         if (length <= 14)
00091             lcd.printString(buffer,0,2);
00092 
00093         // can also print individual characters at specified place
00094         lcd.printChar('X',5,3);
00095 
00096         // draw a line across the display at y = 40 pixels (origin top-left)
00097         for (int i = 0; i < WIDTH; i++) {
00098             lcd.setPixel(i,40);
00099         }
00100         // need to refresh display after setting pixels or writing strings
00101         lcd.refresh();
00102         wait(5.0);
00103 
00104         // can check status of pixel using getPixel(x,y);
00105         lcd.clear();  // clear buffer
00106         lcd.setPixel(2,2);  // set random pixel in buffer
00107         lcd.refresh();
00108         wait(1.0);
00109 
00110         int pixel_to_test = lcd.getPixel(2,2);
00111 
00112         printf("2,2 Pixel value = %i\n",pixel_to_test);
00113 
00114         if ( pixel_to_test ) {
00115             lcd.printString("2,2 is set",0,4);
00116         }
00117 
00118         // this one shouldn't be set
00119         pixel_to_test = lcd.getPixel(3,3);
00120 
00121         printf("3,3 Pixel value = %i\n",pixel_to_test);
00122 
00123         if ( pixel_to_test == 0 ) {
00124             lcd.printString("3,3 is clear",0,5);
00125         }
00126 
00127         lcd.refresh();
00128         wait(4.0);
00129 
00130         lcd.clear();            // clear buffer
00131         lcd.inverseMode();      // invert colours
00132         lcd.setBrightness(1.0); // put LED backlight on full
00133 
00134         float array[84];
00135 
00136         for (int i = 0; i < 84; i++) {
00137             array[i] = 0.5 + 0.5*sin(i*2*3.14/84);
00138         }
00139 
00140         // can also plot graphs - 84 elements only
00141         // values must be in range 0.0 - 1.0
00142         lcd.plotArray(array);
00143         lcd.refresh();
00144         wait(5.0);
00145 
00146         lcd.clear();
00147         lcd.normalMode();      // normal colour mode back
00148         lcd.setBrightness(0.5); // put LED backlight on 50%
00149 
00150         // example of drawing lines
00151         for (int x = 0; x < WIDTH ; x+=10) {
00152             // x0,y0,x1,y1,type 0-white,1-black,2-dotted
00153             lcd.drawLine(0,0,x,HEIGHT,2);
00154         }
00155         lcd.refresh();  // refresh after drawing shapes
00156         wait(5.0);
00157 
00158 
00159         lcd.clear();
00160         // example of how to draw circles
00161         lcd.drawCircle(WIDTH/2,HEIGHT/2,20,FILL_BLACK);  // x,y,radius,black fill
00162         lcd.drawCircle(WIDTH/2,HEIGHT/2,10,FILL_WHITE);  // x,y,radius,white fill
00163         lcd.drawCircle(WIDTH/2,HEIGHT/2,30,FILL_TRANSPARENT);  // x,y,radius,transparent with outline
00164         lcd.refresh();  // refresh after drawing shapes
00165         wait(5.0);
00166 
00167         lcd.clear();
00168         // example of how to draw rectangles
00169         //          origin x,y,width,height,type
00170         lcd.drawRect(10,10,50,30,FILL_BLACK);  // filled black rectangle
00171         lcd.drawRect(15,15,20,10,FILL_WHITE);  // filled white rectange (no outline)
00172         lcd.drawRect(2,2,70,40,  FILL_TRANSPARENT);    // transparent, just outline
00173         lcd.refresh();  // refresh after drawing shapes
00174         wait(5.0);
00175     }
00176 }
00177 
00178 @endcode
00179 */
00180 class N5110
00181 {
00182 private:
00183 // objects
00184     SPI         *_spi;
00185     PwmOut      *_led;
00186     DigitalOut  *_pwr;
00187     DigitalOut  *_sce;
00188     DigitalOut  *_rst;
00189     DigitalOut  *_dc;
00190 
00191 // variables
00192     unsigned char buffer[84][6];  // screen buffer - the 6 is for the banks - each one is 8 bits;
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     void setPixel(unsigned int const x,
00243                      unsigned int const y,
00244                      bool const  state);
00245     /** Turn off
00246     *
00247     *   Powers down the display and turns of the backlight.
00248     *   Needs to be reinitialised before being re-used.
00249     */
00250     void turnOff();
00251 
00252     /** Clear
00253     *
00254     *   Clears the screen buffer.
00255     */
00256     void clear();
00257 
00258     /** Turn on normal video mode (default)
00259     *  Black on white
00260     */
00261     void normalMode();
00262 
00263     /** Turn on inverse video mode (default)
00264     *  White on black
00265     */
00266     void inverseMode();
00267 
00268     /** Set Brightness
00269     *
00270     *   Sets brightness of LED backlight.
00271     *   @param brightness - float in range 0.0 to 1.0
00272     */
00273     void setBrightness(float const brightness);
00274 
00275     /** Print String
00276     *
00277     *   Prints a string of characters to the screen buffer. String is cut-off after the 83rd pixel.
00278     *   @param x - the column number (0 to 83)
00279     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00280     */
00281     void printString(char const         *str,
00282                      unsigned int const  x,
00283                      unsigned int const  y);
00284 
00285     /** Print Character
00286     *
00287     *   Sends a character to the screen buffer.  Printed at the specified location. Character is cut-off after the 83rd pixel.
00288     *   @param  c - the character to print. Can print ASCII as so printChar('C').
00289     *   @param x - the column number (0 to 83)
00290     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00291     */
00292     void printChar(char const         c,
00293                    unsigned int const x,
00294                    unsigned int const y);
00295 
00296     /** Set a Pixel
00297     *
00298     *   This function sets a pixel in the screen buffer.
00299     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00300     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00301     */
00302     void setPixel(unsigned int const x,
00303                   unsigned int const y);
00304 
00305     /** Clear a Pixel
00306     *
00307     *   This function clears pixel in the screen buffer
00308     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00309     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00310     */
00311     void clearPixel(unsigned int const x,
00312                     unsigned int const y);
00313 
00314     /** Get a Pixel
00315     *
00316     *   This function gets the status of a pixel in the screen buffer.
00317     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00318     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00319     *   @returns
00320     *       0           - pixel is clear
00321     *       1    - pixel is set
00322     */
00323     int getPixel(unsigned int const x,
00324                  unsigned int const y) const;
00325 
00326     /** Refresh display
00327     *
00328     *   This functions sends the screen buffer to the display.
00329     */
00330     void refresh();
00331 
00332     /** Randomise buffer
00333     *
00334     *   This function fills the buffer with random data.  Can be used to test the display.
00335     *   A call to refresh() must be made to update the display to reflect the change in pixels.
00336     *   The seed is not set and so the generated pattern will probably be the same each time.
00337     *   TODO: Randomise the seed - maybe using the noise on the AnalogIn pins.
00338     */
00339     void randomiseBuffer();
00340 
00341     /** Plot Array
00342     *
00343     *   This function plots a one-dimensional array in the buffer.
00344     *   @param array[] - y values of the plot. Values should be normalised in the range 0.0 to 1.0. First 84 plotted.
00345     */
00346     void plotArray(float const array[]);
00347 
00348     /** Draw Circle
00349     *
00350     *   This function draws a circle at the specified origin with specified radius in the screen buffer
00351     *   Uses the midpoint circle algorithm.
00352     *   @see http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
00353     *   @param  x0     - x-coordinate of centre
00354     *   @param  y0     - y-coordinate of centre
00355     *   @param  radius - radius of circle in pixels
00356     *   @param  fill   - fill-type for the shape
00357     */
00358     void drawCircle(unsigned int const x0,
00359                     unsigned int const y0,
00360                     unsigned int const radius,
00361                     FillType const     fill);
00362 
00363     /** Draw Line
00364     *
00365     *   This function draws a line between the specified points using linear interpolation.
00366     *   @param  x0 - x-coordinate of first point
00367     *   @param  y0 - y-coordinate of first point
00368     *   @param  x1 - x-coordinate of last point
00369     *   @param  y1 - y-coordinate of last point
00370     *   @param  type - 0 white,1 black,2 dotted
00371     */
00372     void drawLine(unsigned int const x0,
00373                   unsigned int const y0,
00374                   unsigned int const x1,
00375                   unsigned int const y1,
00376                   unsigned int const type);
00377 
00378     /** Draw Rectangle
00379     *
00380     *   This function draws a rectangle.
00381     *   @param  x0 - x-coordinate of origin (top-left)
00382     *   @param  y0 - y-coordinate of origin (top-left)
00383     *   @param  width - width of rectangle
00384     *   @param  height - height of rectangle
00385     *   @param  fill   - fill-type for the shape
00386     */
00387     void drawRect(unsigned int const x0,
00388                   unsigned int const y0,
00389                   unsigned int const width,
00390                   unsigned int const height,
00391                   FillType const     fill);
00392 
00393 private:
00394 // methods
00395     void setXYAddress(unsigned int const x,
00396                       unsigned int const y);
00397     void initSPI();
00398     void turnOn();
00399     void reset();
00400     void clearRAM();
00401     void sendCommand(unsigned char command);
00402     void sendData(unsigned char data);
00403 };
00404 
00405 const unsigned char font5x7[480] = {
00406     0x00, 0x00, 0x00, 0x00, 0x00,// (space)
00407     0x00, 0x00, 0x5F, 0x00, 0x00,// !
00408     0x00, 0x07, 0x00, 0x07, 0x00,// "
00409     0x14, 0x7F, 0x14, 0x7F, 0x14,// #
00410     0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
00411     0x23, 0x13, 0x08, 0x64, 0x62,// %
00412     0x36, 0x49, 0x55, 0x22, 0x50,// &
00413     0x00, 0x05, 0x03, 0x00, 0x00,// '
00414     0x00, 0x1C, 0x22, 0x41, 0x00,// (
00415     0x00, 0x41, 0x22, 0x1C, 0x00,// )
00416     0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
00417     0x08, 0x08, 0x3E, 0x08, 0x08,// +
00418     0x00, 0x50, 0x30, 0x00, 0x00,// ,
00419     0x08, 0x08, 0x08, 0x08, 0x08,// -
00420     0x00, 0x60, 0x60, 0x00, 0x00,// .
00421     0x20, 0x10, 0x08, 0x04, 0x02,// /
00422     0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
00423     0x00, 0x42, 0x7F, 0x40, 0x00,// 1
00424     0x42, 0x61, 0x51, 0x49, 0x46,// 2
00425     0x21, 0x41, 0x45, 0x4B, 0x31,// 3
00426     0x18, 0x14, 0x12, 0x7F, 0x10,// 4
00427     0x27, 0x45, 0x45, 0x45, 0x39,// 5
00428     0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
00429     0x01, 0x71, 0x09, 0x05, 0x03,// 7
00430     0x36, 0x49, 0x49, 0x49, 0x36,// 8
00431     0x06, 0x49, 0x49, 0x29, 0x1E,// 9
00432     0x00, 0x36, 0x36, 0x00, 0x00,// :
00433     0x00, 0x56, 0x36, 0x00, 0x00,// ;
00434     0x00, 0x08, 0x14, 0x22, 0x41,// <
00435     0x14, 0x14, 0x14, 0x14, 0x14,// =
00436     0x41, 0x22, 0x14, 0x08, 0x00,// >
00437     0x02, 0x01, 0x51, 0x09, 0x06,// ?
00438     0x32, 0x49, 0x79, 0x41, 0x3E,// @
00439     0x7E, 0x11, 0x11, 0x11, 0x7E,// A
00440     0x7F, 0x49, 0x49, 0x49, 0x36,// B
00441     0x3E, 0x41, 0x41, 0x41, 0x22,// C
00442     0x7F, 0x41, 0x41, 0x22, 0x1C,// D
00443     0x7F, 0x49, 0x49, 0x49, 0x41,// E
00444     0x7F, 0x09, 0x09, 0x01, 0x01,// F
00445     0x3E, 0x41, 0x41, 0x51, 0x32,// G
00446     0x7F, 0x08, 0x08, 0x08, 0x7F,// H
00447     0x00, 0x41, 0x7F, 0x41, 0x00,// I
00448     0x20, 0x40, 0x41, 0x3F, 0x01,// J
00449     0x7F, 0x08, 0x14, 0x22, 0x41,// K
00450     0x7F, 0x40, 0x40, 0x40, 0x40,// L
00451     0x7F, 0x02, 0x04, 0x02, 0x7F,// M
00452     0x7F, 0x04, 0x08, 0x10, 0x7F,// N
00453     0x3E, 0x41, 0x41, 0x41, 0x3E,// O
00454     0x7F, 0x09, 0x09, 0x09, 0x06,// P
00455     0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
00456     0x7F, 0x09, 0x19, 0x29, 0x46,// R
00457     0x46, 0x49, 0x49, 0x49, 0x31,// S
00458     0x01, 0x01, 0x7F, 0x01, 0x01,// T
00459     0x3F, 0x40, 0x40, 0x40, 0x3F,// U
00460     0x1F, 0x20, 0x40, 0x20, 0x1F,// V
00461     0x7F, 0x20, 0x18, 0x20, 0x7F,// W
00462     0x63, 0x14, 0x08, 0x14, 0x63,// X
00463     0x03, 0x04, 0x78, 0x04, 0x03,// Y
00464     0x61, 0x51, 0x49, 0x45, 0x43,// Z
00465     0x00, 0x00, 0x7F, 0x41, 0x41,// [
00466     0x02, 0x04, 0x08, 0x10, 0x20,// "\"
00467     0x41, 0x41, 0x7F, 0x00, 0x00,// ]
00468     0x04, 0x02, 0x01, 0x02, 0x04,// ^
00469     0x40, 0x40, 0x40, 0x40, 0x40,// _
00470     0x00, 0x01, 0x02, 0x04, 0x00,// `
00471     0x20, 0x54, 0x54, 0x54, 0x78,// a
00472     0x7F, 0x48, 0x44, 0x44, 0x38,// b
00473     0x38, 0x44, 0x44, 0x44, 0x20,// c
00474     0x38, 0x44, 0x44, 0x48, 0x7F,// d
00475     0x38, 0x54, 0x54, 0x54, 0x18,// e
00476     0x08, 0x7E, 0x09, 0x01, 0x02,// f
00477     0x08, 0x14, 0x54, 0x54, 0x3C,// g
00478     0x7F, 0x08, 0x04, 0x04, 0x78,// h
00479     0x00, 0x44, 0x7D, 0x40, 0x00,// i
00480     0x20, 0x40, 0x44, 0x3D, 0x00,// j
00481     0x00, 0x7F, 0x10, 0x28, 0x44,// k
00482     0x00, 0x41, 0x7F, 0x40, 0x00,// l
00483     0x7C, 0x04, 0x18, 0x04, 0x78,// m
00484     0x7C, 0x08, 0x04, 0x04, 0x78,// n
00485     0x38, 0x44, 0x44, 0x44, 0x38,// o
00486     0x7C, 0x14, 0x14, 0x14, 0x08,// p
00487     0x08, 0x14, 0x14, 0x18, 0x7C,// q
00488     0x7C, 0x08, 0x04, 0x04, 0x08,// r
00489     0x48, 0x54, 0x54, 0x54, 0x20,// s
00490     0x04, 0x3F, 0x44, 0x40, 0x20,// t
00491     0x3C, 0x40, 0x40, 0x20, 0x7C,// u
00492     0x1C, 0x20, 0x40, 0x20, 0x1C,// v
00493     0x3C, 0x40, 0x30, 0x40, 0x3C,// w
00494     0x44, 0x28, 0x10, 0x28, 0x44,// x
00495     0x0C, 0x50, 0x50, 0x50, 0x3C,// y
00496     0x44, 0x64, 0x54, 0x4C, 0x44,// z
00497     0x00, 0x08, 0x36, 0x41, 0x00,// {
00498     0x00, 0x00, 0x7F, 0x00, 0x00,// |
00499     0x00, 0x41, 0x36, 0x08, 0x00,// }
00500     0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
00501     0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
00502 };
00503 
00504 #endif