EAOLEDExample

Published 28 Feb 2010, by Simon Ford
display, embedded artists, OLED
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EAOLED.cpp

00001 // test library for Embedded Artists OLED used on Xpresso Baseboard
00002 
00003 #include "EAOLED.h"
00004 #include "mbed.h"
00005 
00006 EAOLED::EAOLED(PinName mosi, PinName dnc, PinName sclk, PinName cs, PinName power) 
00007     : _spi(mosi, NC, sclk), _data(dnc), _cs(cs), _power(power) {
00008     reset();    
00009 }
00010       
00011 void EAOLED::command(int value) {
00012     _data = 0;
00013     _cs = 0;
00014     _spi.write(value);
00015     _cs = 1;
00016 }
00017 
00018 void EAOLED::data(int value) {
00019     _data = 1;
00020     _cs = 0;
00021     _spi.write(value);
00022     _cs = 1;
00023 }
00024 
00025 void EAOLED::reset() {
00026     _power = 0;
00027     _cs = 1;
00028 
00029     // Startup sequence recommended by embedded artists baseboard reference code
00030     command(0x02); // set low column address
00031     command(0x12); // set high column address
00032     command(0x40); // display start set
00033     command(0x2e); // stop horzontal scroll
00034     command(0x81); // set contrast control register
00035     command(0x32); //
00036     command(0x82); // brightness for color banks
00037     command(0x80); // display on
00038     command(0xa1); // set segment re-map
00039     command(0xa6); // set normal/inverse display
00040     command(0xa8); // set multiplex ratio
00041     command(0x3F); //
00042     command(0xd3); // set display offset
00043     command(0x40); //
00044     command(0xad); // set dc-dc on/off
00045     command(0x8E); //
00046     command(0xc8); // set com output scan direction
00047     command(0xd5); // set display clock divide ratio/oscillator/frequency
00048     command(0xf0); //
00049     command(0xd8); // set area color mode on/off & low power display mode 
00050     command(0x05); //
00051     command(0xd9); // set pre-charge period
00052     command(0xF1); //
00053     command(0xda); // set com pins hardware configuration
00054     command(0x12); //
00055     command(0xdb); // set vcom deselect level
00056     command(0x34); //
00057     command(0x91); // set look up table for area color 
00058     command(0x3f); //
00059     command(0x3f); //
00060     command(0x3f); //
00061     command(0x3f); //
00062     command(0xaf); // display on
00063     command(0xa4); // display on
00064 
00065     wait_us(10);
00066 
00067     _power = 1;
00068 }
00069 
00070 #define OLED_DISPLAY_WIDTH  96
00071 #define OLED_DISPLAY_HEIGHT 64
00072 
00073 void EAOLED::pixel(int x, int y, int colour) {
00074     int page = y >> 3;
00075     int address = 18 + x;
00076     
00077     int lo = (address >> 0) & 0x0F;
00078     int hi =  (address >> 4) | 0x10;
00079     int mask = 1 << (y & 0x7);
00080     int byte = page * OLED_DISPLAY_WIDTH + x;
00081     
00082     if(colour) {
00083         framebuffer[byte] |= mask;
00084     } else {
00085         framebuffer[byte] &= ~mask;
00086     }
00087 
00088     command(0xB0 + page);
00089     command(lo);
00090     command(hi);
00091     data(framebuffer[byte]);
00092 }
00093 
00094 /*void EAOLED::cls() {
00095     for(int y=0; y<64; y++) {
00096         for (int x=0; x<96; x++) {
00097             pixel(x, y, 0xFFFFFF);
00098         }
00099     }
00100 }*/
00101