N5110.h

00001 /**
00002 @file N5110.h
00003 
00004 @brief Header file containing member functions and variables
00005 
00006 */
00007 
00008 #ifndef N5110_H
00009 #define N5110_H
00010 
00011 // Command Bytes - taken from Chris Yan's library
00012 // More information can be found in the display datasheet
00013 // H = 0 - Basic instructions
00014 #define CMD_DC_CLEAR_DISPLAY   0x08
00015 #define CMD_DC_NORMAL_MODE     0x0C
00016 #define CMD_DC_FILL_DISPLAY    0x09
00017 #define CMD_DC_INVERT_VIDEO    0x0D
00018 #define CMD_FS_HORIZONTAL_MODE 0x00
00019 #define CMD_FS_VERTICAL_MODE   0x02
00020 #define CMD_FS_BASIC_MODE      0x00
00021 #define CMD_FS_EXTENDED_MODE   0x01
00022 #define CMD_FS_ACTIVE_MODE     0x00
00023 #define CMD_FS_POWER_DOWN_MODE 0x04
00024 // H = 1 - Extended instructions
00025 #define CMD_TC_TEMP_0          0x04
00026 #define CMD_TC_TEMP_1          0x05
00027 #define CMD_TC_TEMP_2          0x06
00028 #define CMD_TC_TEMP_3          0x07
00029 #define CMD_BI_MUX_24          0x15
00030 #define CMD_BI_MUX_48          0x13
00031 #define CMD_BI_MUX_100         0x10
00032 #define CMD_VOP_6V06           0xB2
00033 #define CMD_VOP_7V38           0xC8
00034 
00035 // number of pixels on display
00036 #define WIDTH 84
00037 #define HEIGHT 48
00038 #define BANKS 6
00039 
00040 #include "mbed.h"
00041 
00042 /**
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 1.2
00051 
00052 @author Craig A. Evans
00053 @date   17th March 2015
00054  *
00055  * Example:
00056  * @code
00057 
00058 #include "mbed.h"
00059 #include "N5110.h"
00060 
00061 //    VCC,SCE,RST,D/C,MOSI,SCLK,LED
00062 N5110 lcd(p7,p8,p9,p10,p11,p13,p21);
00063 // Can also power (VCC) directly from VOUT (3.3 V) -
00064 // Can give better performance due to current limitation from GPIO pin
00065 
00066 int main()
00067 {
00068     // first need to initialise display
00069     lcd.init();
00070 
00071     while(1) {
00072 
00073         // these are default settings so not strictly needed
00074         lcd.normalMode();      // normal colour mode
00075         lcd.setBrightness(0.5); // put LED backlight on 50%
00076 
00077         // can directly print strings at specified co-ordinates
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
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
00101         lcd.refresh();
00102 
00103         // can also check status of pixels using getPixel(x,y)
00104 
00105         wait(5.0);
00106         lcd.clear();            // clear display
00107         lcd.inverseMode();      // invert colours
00108         lcd.setBrightness(1.0); // put LED backlight on full
00109 
00110         float array[84];
00111 
00112         for (int i = 0; i < 84; i++) {
00113             array[i] = 0.5 + 0.5*sin(i*2*3.14/84);
00114         }
00115 
00116         // can also plot graphs - 84 elements only
00117         // values must be in range 0.0 - 1.0
00118         lcd.plotArray(array);
00119         wait(5.0);
00120         lcd.clear();
00121         lcd.normalMode();      // normal colour mode back
00122         lcd.setBrightness(0.5); // put LED backlight on 50%
00123 
00124         // example of drawing lines
00125         for (int x = 0; x < WIDTH ; x+=10) {
00126             // x0,y0,x1,y1,type 0-white,1-black,2-dotted
00127             lcd.drawLine(0,0,x,HEIGHT,2);
00128         }
00129         lcd.refresh();   // need to refresh screen after drawing lines
00130 
00131         wait(5.0);
00132         lcd.clear();
00133 
00134         // example of how to draw circles
00135         lcd.drawCircle(WIDTH/2,HEIGHT/2,20,1);  // x,y,radius,black fill
00136         lcd.drawCircle(WIDTH/2,HEIGHT/2,10,2);  // x,y,radius,white fill
00137         lcd.drawCircle(WIDTH/2,HEIGHT/2,30,0);  // x,y,radius,transparent with outline
00138         lcd.refresh();   // need to refresh screen after drawing circles
00139 
00140         wait(5.0);
00141         lcd.clear();
00142 
00143         // example of how to draw rectangles
00144         //          origin x,y,width,height,type
00145         lcd.drawRect(10,10,50,30,1);  // filled black rectangle
00146         lcd.drawRect(15,15,20,10,2);  // filled white rectange (no outline)
00147         lcd.drawRect(2,2,70,40,0);    // transparent, just outline
00148         lcd.refresh();   // need to refresh screen after drawing rects
00149 
00150 
00151         wait(5.0);
00152         lcd.clear();
00153 
00154     }
00155 }
00156 
00157 
00158  * @endcode
00159  */
00160 class N5110
00161 {
00162 
00163 public:
00164     /** Create a N5110 object connected to the specified pins
00165     *
00166     * @param pwr Pin connected to Vcc on the LCD display (pin 1)
00167     * @param sce Pin connected to chip enable (pin 3)
00168     * @param rst Pin connected to reset (pin 4)
00169     * @param dc  Pin connected to data/command select (pin 5)
00170     * @param mosi Pin connected to data input (MOSI) (pin 6)
00171     * @param sclk Pin connected to serial clock (SCLK) (pin 7)
00172     * @param led Pin connected to LED backlight (must be PWM) (pin 8)
00173     *
00174     */
00175     N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin);
00176 
00177     /** Initialise display
00178     *
00179     *   Powers up the display and turns on backlight (50% brightness default).
00180     *   Sets the display up in horizontal addressing mode and with normal video mode.
00181     */
00182     void init();
00183 
00184     /** Turn off
00185     *
00186     *   Powers down the display and turns of the backlight.
00187     *   Needs to be reinitialised before being re-used.
00188     */
00189     void turnOff();
00190 
00191     /** Clears
00192     *
00193     *   Clears the screen.
00194     */
00195     void clear();
00196 
00197     /** Turn on normal video mode (default)
00198     *  Black on white
00199     */
00200     void normalMode();
00201 
00202     /** Turn on inverse video mode (default)
00203     *  White on black
00204     */
00205     void inverseMode();
00206 
00207     /** Set Brightness
00208     *
00209     *   Sets brightness of LED backlight.
00210     *   @param brightness - float in range 0.0 to 1.0
00211     */
00212     void setBrightness(float brightness);
00213 
00214     /** Print String
00215     *
00216     *   Prints a string of characters to the display. String is cut-off after the 83rd pixel.
00217     *   @param x - the column number (0 to 83)
00218     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00219     */
00220     void printString(const char * str,int x,int y);
00221 
00222     /** Print Character
00223     *
00224     *   Sends a character to the display.  Printed at the specified location. Character is cut-off after the 83rd pixel.
00225     *   @param  c - the character to print. Can print ASCII as so printChar('C').
00226     *   @param x - the column number (0 to 83)
00227     *   @param y - the row number (0 to 5) - the display is split into 6 banks - each bank can be considered a row
00228     */
00229     void printChar(char c,int x,int y);
00230 
00231     /** Set a Pixel
00232     *
00233     *   This function sets a pixel in the display. A call to refresh() must be made
00234     *   to update the display to reflect the change in pixels.
00235     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00236     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00237     */
00238     void setPixel(int x, int y);
00239 
00240     /** Clear a Pixel
00241     *
00242     *   This function clears pixel in the display. A call to refresh() must be made
00243     *   to update the display to reflect the change in pixels.
00244     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00245     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00246     */
00247     void clearPixel(int x, int y);
00248 
00249     /** Get a Pixel
00250     *
00251     *   This function gets the status of a pixel in the display.
00252     *   @param  x - the x co-ordinate of the pixel (0 to 83)
00253     *   @param  y - the y co-ordinate of the pixel (0 to 47)
00254     *   @returns
00255     *       0           - pixel is clear
00256     *       non-zero    - pixel is set
00257     */
00258     int getPixel(int x, int y);
00259 
00260     /** Refresh display
00261     *
00262     *   This functions refreshes the display to reflect the current data in the buffer.
00263     */
00264     void refresh();
00265 
00266     /** Randomise buffer
00267     *
00268     *   This function fills the buffer with random data.  Can be used to test the display.
00269     *   A call to refresh() must be made to update the display to reflect the change in pixels.
00270     *   The seed is not set and so the generated pattern will probably be the same each time.
00271     *   TODO: Randomise the seed - maybe using the noise on the AnalogIn pins.
00272     */
00273     void randomiseBuffer();
00274 
00275     /** Plot Array
00276     *
00277     *   This function plots a one-dimensional array on the display.
00278     *   @param array[] - y values of the plot. Values should be normalised in the range 0.0 to 1.0. First 84 plotted.
00279     */
00280     void plotArray(float array[]);
00281 
00282     /** Draw Circle
00283     *
00284     *   This function draws a circle at the specified origin with specified radius to the display.
00285     *   Uses the midpoint circle algorithm.
00286     *   @see http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
00287     *   @param  x0 - x-coordinate of centre
00288     *   @param  y0 - y-coordinate of centre
00289     *   @param  radius - radius of circle in pixels
00290     *   @param  fill - 0 transparent (w/outline), 1 filled black, 2 filled white (wo/outline)
00291     */
00292     void drawCircle(int x0,int y0,int radius,int fill);
00293 
00294     /** Draw Line
00295     *
00296     *   This function draws a line between the specified points using linear interpolation.
00297     *   @param  x0 - x-coordinate of first point
00298     *   @param  y0 - y-coordinate of first point
00299     *   @param  x1 - x-coordinate of last point
00300     *   @param  y1 - y-coordinate of last point
00301     *   @param  type - 0 white,1 black,2 dotted
00302     */
00303     void drawLine(int x0,int y0,int x1,int y1,int type);
00304 
00305     /** Draw Rectangle
00306     *
00307     *   This function draws a rectangle.
00308     *   @param  x0 - x-coordinate of origin (top-left)
00309     *   @param  y0 - y-coordinate of origin (top-left)
00310     *   @param  width - width of rectangle
00311     *   @param  height - height of rectangle
00312     *   @param  fill - 0 transparent (w/outline), 1 filled black, 2 filled white (wo/outline)
00313     */
00314     void drawRect(int x0,int y0,int width,int height,int fill);
00315 
00316 
00317 private:
00318 
00319     void setXYAddress(int x, int y);
00320     void initSPI();
00321     void turnOn();
00322     void reset();
00323     void clearRAM();
00324     void clearBuffer();
00325     void sendCommand(unsigned char command);
00326     void sendData(unsigned char data);
00327 
00328 public:
00329     unsigned char buffer[84][6];  // screen buffer - the 6 is for the banks - each one is 8 bits;
00330 
00331 private:  // private variables
00332     SPI*    spi;
00333     PwmOut* led;
00334     DigitalOut* pwr;
00335     DigitalOut* sce;
00336     DigitalOut* rst;
00337     DigitalOut* dc;
00338 
00339 };
00340 
00341 const unsigned char font5x7[480] = {
00342     0x00, 0x00, 0x00, 0x00, 0x00,// (space)
00343     0x00, 0x00, 0x5F, 0x00, 0x00,// !
00344     0x00, 0x07, 0x00, 0x07, 0x00,// "
00345     0x14, 0x7F, 0x14, 0x7F, 0x14,// #
00346     0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
00347     0x23, 0x13, 0x08, 0x64, 0x62,// %
00348     0x36, 0x49, 0x55, 0x22, 0x50,// &
00349     0x00, 0x05, 0x03, 0x00, 0x00,// '
00350     0x00, 0x1C, 0x22, 0x41, 0x00,// (
00351     0x00, 0x41, 0x22, 0x1C, 0x00,// )
00352     0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
00353     0x08, 0x08, 0x3E, 0x08, 0x08,// +
00354     0x00, 0x50, 0x30, 0x00, 0x00,// ,
00355     0x08, 0x08, 0x08, 0x08, 0x08,// -
00356     0x00, 0x60, 0x60, 0x00, 0x00,// .
00357     0x20, 0x10, 0x08, 0x04, 0x02,// /
00358     0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
00359     0x00, 0x42, 0x7F, 0x40, 0x00,// 1
00360     0x42, 0x61, 0x51, 0x49, 0x46,// 2
00361     0x21, 0x41, 0x45, 0x4B, 0x31,// 3
00362     0x18, 0x14, 0x12, 0x7F, 0x10,// 4
00363     0x27, 0x45, 0x45, 0x45, 0x39,// 5
00364     0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
00365     0x01, 0x71, 0x09, 0x05, 0x03,// 7
00366     0x36, 0x49, 0x49, 0x49, 0x36,// 8
00367     0x06, 0x49, 0x49, 0x29, 0x1E,// 9
00368     0x00, 0x36, 0x36, 0x00, 0x00,// :
00369     0x00, 0x56, 0x36, 0x00, 0x00,// ;
00370     0x00, 0x08, 0x14, 0x22, 0x41,// <
00371     0x14, 0x14, 0x14, 0x14, 0x14,// =
00372     0x41, 0x22, 0x14, 0x08, 0x00,// >
00373     0x02, 0x01, 0x51, 0x09, 0x06,// ?
00374     0x32, 0x49, 0x79, 0x41, 0x3E,// @
00375     0x7E, 0x11, 0x11, 0x11, 0x7E,// A
00376     0x7F, 0x49, 0x49, 0x49, 0x36,// B
00377     0x3E, 0x41, 0x41, 0x41, 0x22,// C
00378     0x7F, 0x41, 0x41, 0x22, 0x1C,// D
00379     0x7F, 0x49, 0x49, 0x49, 0x41,// E
00380     0x7F, 0x09, 0x09, 0x01, 0x01,// F
00381     0x3E, 0x41, 0x41, 0x51, 0x32,// G
00382     0x7F, 0x08, 0x08, 0x08, 0x7F,// H
00383     0x00, 0x41, 0x7F, 0x41, 0x00,// I
00384     0x20, 0x40, 0x41, 0x3F, 0x01,// J
00385     0x7F, 0x08, 0x14, 0x22, 0x41,// K
00386     0x7F, 0x40, 0x40, 0x40, 0x40,// L
00387     0x7F, 0x02, 0x04, 0x02, 0x7F,// M
00388     0x7F, 0x04, 0x08, 0x10, 0x7F,// N
00389     0x3E, 0x41, 0x41, 0x41, 0x3E,// O
00390     0x7F, 0x09, 0x09, 0x09, 0x06,// P
00391     0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
00392     0x7F, 0x09, 0x19, 0x29, 0x46,// R
00393     0x46, 0x49, 0x49, 0x49, 0x31,// S
00394     0x01, 0x01, 0x7F, 0x01, 0x01,// T
00395     0x3F, 0x40, 0x40, 0x40, 0x3F,// U
00396     0x1F, 0x20, 0x40, 0x20, 0x1F,// V
00397     0x7F, 0x20, 0x18, 0x20, 0x7F,// W
00398     0x63, 0x14, 0x08, 0x14, 0x63,// X
00399     0x03, 0x04, 0x78, 0x04, 0x03,// Y
00400     0x61, 0x51, 0x49, 0x45, 0x43,// Z
00401     0x00, 0x00, 0x7F, 0x41, 0x41,// [
00402     0x02, 0x04, 0x08, 0x10, 0x20,// "\"
00403     0x41, 0x41, 0x7F, 0x00, 0x00,// ]
00404     0x04, 0x02, 0x01, 0x02, 0x04,// ^
00405     0x40, 0x40, 0x40, 0x40, 0x40,// _
00406     0x00, 0x01, 0x02, 0x04, 0x00,// `
00407     0x20, 0x54, 0x54, 0x54, 0x78,// a
00408     0x7F, 0x48, 0x44, 0x44, 0x38,// b
00409     0x38, 0x44, 0x44, 0x44, 0x20,// c
00410     0x38, 0x44, 0x44, 0x48, 0x7F,// d
00411     0x38, 0x54, 0x54, 0x54, 0x18,// e
00412     0x08, 0x7E, 0x09, 0x01, 0x02,// f
00413     0x08, 0x14, 0x54, 0x54, 0x3C,// g
00414     0x7F, 0x08, 0x04, 0x04, 0x78,// h
00415     0x00, 0x44, 0x7D, 0x40, 0x00,// i
00416     0x20, 0x40, 0x44, 0x3D, 0x00,// j
00417     0x00, 0x7F, 0x10, 0x28, 0x44,// k
00418     0x00, 0x41, 0x7F, 0x40, 0x00,// l
00419     0x7C, 0x04, 0x18, 0x04, 0x78,// m
00420     0x7C, 0x08, 0x04, 0x04, 0x78,// n
00421     0x38, 0x44, 0x44, 0x44, 0x38,// o
00422     0x7C, 0x14, 0x14, 0x14, 0x08,// p
00423     0x08, 0x14, 0x14, 0x18, 0x7C,// q
00424     0x7C, 0x08, 0x04, 0x04, 0x08,// r
00425     0x48, 0x54, 0x54, 0x54, 0x20,// s
00426     0x04, 0x3F, 0x44, 0x40, 0x20,// t
00427     0x3C, 0x40, 0x40, 0x20, 0x7C,// u
00428     0x1C, 0x20, 0x40, 0x20, 0x1C,// v
00429     0x3C, 0x40, 0x30, 0x40, 0x3C,// w
00430     0x44, 0x28, 0x10, 0x28, 0x44,// x
00431     0x0C, 0x50, 0x50, 0x50, 0x3C,// y
00432     0x44, 0x64, 0x54, 0x4C, 0x44,// z
00433     0x00, 0x08, 0x36, 0x41, 0x00,// {
00434     0x00, 0x00, 0x7F, 0x00, 0x00,// |
00435     0x00, 0x41, 0x36, 0x08, 0x00,// }
00436     0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
00437     0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
00438 };
00439 
00440 #endif