EAOLED.cpp

00001 /* mbed Embedded Artists OLED library, as found on the LPCXpresso Baseboard
00002  * Copyright (c) 2010, sford
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022 
00023 #include "EAOLED.h"
00024 #include "mbed.h"
00025 
00026 EAOLED::EAOLED(PinName mosi, PinName dnc, PinName sclk, PinName cs, PinName power) 
00027     : _spi(mosi, NC, sclk), _data(dnc), _cs(cs), _power(power) {
00028     reset();    
00029 }
00030       
00031 void EAOLED::command(int value) {
00032     _data = 0;
00033     _cs = 0;
00034     _spi.write(value);
00035     _cs = 1;
00036 }
00037 
00038 void EAOLED::data(int value) {
00039     _data = 1;
00040     _cs = 0;
00041     _spi.write(value);
00042     _cs = 1;
00043 }
00044 
00045 void EAOLED::reset() {
00046     _power = 0;
00047     _cs = 1;
00048 
00049     // Startup sequence recommended by embedded artists baseboard reference code
00050     command(0x02); // set low column address
00051     command(0x12); // set high column address
00052     command(0x40); // display start set
00053     command(0x2e); // stop horzontal scroll
00054     command(0x81); // set contrast control register
00055     command(0x32); //
00056     command(0x82); // brightness for color banks
00057     command(0x80); // display on
00058     command(0xa1); // set segment re-map
00059     command(0xa6); // set normal/inverse display
00060     command(0xa8); // set multiplex ratio
00061     command(0x3F); //
00062     command(0xd3); // set display offset
00063     command(0x40); //
00064     command(0xad); // set dc-dc on/off
00065     command(0x8E); //
00066     command(0xc8); // set com output scan direction
00067     command(0xd5); // set display clock divide ratio/oscillator/frequency
00068     command(0xf0); //
00069     command(0xd8); // set area color mode on/off & low power display mode 
00070     command(0x05); //
00071     command(0xd9); // set pre-charge period
00072     command(0xF1); //
00073     command(0xda); // set com pins hardware configuration
00074     command(0x12); //
00075     command(0xdb); // set vcom deselect level
00076     command(0x34); //
00077     command(0x91); // set look up table for area color 
00078     command(0x3f); //
00079     command(0x3f); //
00080     command(0x3f); //
00081     command(0x3f); //
00082     command(0xaf); // display on
00083     command(0xa4); // display on
00084 
00085     wait_us(10);
00086 
00087     _power = 1;
00088 }
00089 
00090 #define OLED_DISPLAY_WIDTH  96
00091 #define OLED_DISPLAY_HEIGHT 64
00092 
00093 void EAOLED::pixel(int x, int y, int colour) {
00094     int page = y >> 3;
00095     int address = 18 + x;
00096     
00097     int lo = (address >> 0) & 0x0F;
00098     int hi =  (address >> 4) | 0x10;
00099     int mask = 1 << (y & 0x7);
00100     int byte = page * OLED_DISPLAY_WIDTH + x;
00101     
00102     if(colour) {
00103         framebuffer[byte] |= mask;
00104     } else {
00105         framebuffer[byte] &= ~mask;
00106     }
00107 
00108     command(0xB0 + page);
00109     command(lo);
00110     command(hi);
00111     data(framebuffer[byte]);
00112 }
00113 
00114 /*void EAOLED::cls() {
00115     for(int y=0; y<64; y++) {
00116         for (int x=0; x<96; x++) {
00117             pixel(x, y, 0xFFFFFF);
00118         }
00119     }
00120 }*/
00121