Simon Ford
A test example using the OLED display on the Embedded Artists Xpresso baseboard
EAOLED.cpp@0:f42b25503fd1, 2010-02-28 (annotated)
- Committer:
- simon
- Date:
- Sun Feb 28 16:04:59 2010 +0000
- Revision:
- 0:f42b25503fd1
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| simon | 0:f42b25503fd1 | 1 | // test library for Embedded Artists OLED used on Xpresso Baseboard |
| simon | 0:f42b25503fd1 | 2 | |
| simon | 0:f42b25503fd1 | 3 | #include "EAOLED.h" |
| simon | 0:f42b25503fd1 | 4 | #include "mbed.h" |
| simon | 0:f42b25503fd1 | 5 | |
| simon | 0:f42b25503fd1 | 6 | EAOLED::EAOLED(PinName mosi, PinName dnc, PinName sclk, PinName cs, PinName power) |
| simon | 0:f42b25503fd1 | 7 | : _spi(mosi, NC, sclk), _data(dnc), _cs(cs), _power(power) { |
| simon | 0:f42b25503fd1 | 8 | reset(); |
| simon | 0:f42b25503fd1 | 9 | } |
| simon | 0:f42b25503fd1 | 10 | |
| simon | 0:f42b25503fd1 | 11 | void EAOLED::command(int value) { |
| simon | 0:f42b25503fd1 | 12 | _data = 0; |
| simon | 0:f42b25503fd1 | 13 | _cs = 0; |
| simon | 0:f42b25503fd1 | 14 | _spi.write(value); |
| simon | 0:f42b25503fd1 | 15 | _cs = 1; |
| simon | 0:f42b25503fd1 | 16 | } |
| simon | 0:f42b25503fd1 | 17 | |
| simon | 0:f42b25503fd1 | 18 | void EAOLED::data(int value) { |
| simon | 0:f42b25503fd1 | 19 | _data = 1; |
| simon | 0:f42b25503fd1 | 20 | _cs = 0; |
| simon | 0:f42b25503fd1 | 21 | _spi.write(value); |
| simon | 0:f42b25503fd1 | 22 | _cs = 1; |
| simon | 0:f42b25503fd1 | 23 | } |
| simon | 0:f42b25503fd1 | 24 | |
| simon | 0:f42b25503fd1 | 25 | void EAOLED::reset() { |
| simon | 0:f42b25503fd1 | 26 | _power = 0; |
| simon | 0:f42b25503fd1 | 27 | _cs = 1; |
| simon | 0:f42b25503fd1 | 28 | |
| simon | 0:f42b25503fd1 | 29 | // Startup sequence recommended by embedded artists baseboard reference code |
| simon | 0:f42b25503fd1 | 30 | command(0x02); // set low column address |
| simon | 0:f42b25503fd1 | 31 | command(0x12); // set high column address |
| simon | 0:f42b25503fd1 | 32 | command(0x40); // display start set |
| simon | 0:f42b25503fd1 | 33 | command(0x2e); // stop horzontal scroll |
| simon | 0:f42b25503fd1 | 34 | command(0x81); // set contrast control register |
| simon | 0:f42b25503fd1 | 35 | command(0x32); // |
| simon | 0:f42b25503fd1 | 36 | command(0x82); // brightness for color banks |
| simon | 0:f42b25503fd1 | 37 | command(0x80); // display on |
| simon | 0:f42b25503fd1 | 38 | command(0xa1); // set segment re-map |
| simon | 0:f42b25503fd1 | 39 | command(0xa6); // set normal/inverse display |
| simon | 0:f42b25503fd1 | 40 | command(0xa8); // set multiplex ratio |
| simon | 0:f42b25503fd1 | 41 | command(0x3F); // |
| simon | 0:f42b25503fd1 | 42 | command(0xd3); // set display offset |
| simon | 0:f42b25503fd1 | 43 | command(0x40); // |
| simon | 0:f42b25503fd1 | 44 | command(0xad); // set dc-dc on/off |
| simon | 0:f42b25503fd1 | 45 | command(0x8E); // |
| simon | 0:f42b25503fd1 | 46 | command(0xc8); // set com output scan direction |
| simon | 0:f42b25503fd1 | 47 | command(0xd5); // set display clock divide ratio/oscillator/frequency |
| simon | 0:f42b25503fd1 | 48 | command(0xf0); // |
| simon | 0:f42b25503fd1 | 49 | command(0xd8); // set area color mode on/off & low power display mode |
| simon | 0:f42b25503fd1 | 50 | command(0x05); // |
| simon | 0:f42b25503fd1 | 51 | command(0xd9); // set pre-charge period |
| simon | 0:f42b25503fd1 | 52 | command(0xF1); // |
| simon | 0:f42b25503fd1 | 53 | command(0xda); // set com pins hardware configuration |
| simon | 0:f42b25503fd1 | 54 | command(0x12); // |
| simon | 0:f42b25503fd1 | 55 | command(0xdb); // set vcom deselect level |
| simon | 0:f42b25503fd1 | 56 | command(0x34); // |
| simon | 0:f42b25503fd1 | 57 | command(0x91); // set look up table for area color |
| simon | 0:f42b25503fd1 | 58 | command(0x3f); // |
| simon | 0:f42b25503fd1 | 59 | command(0x3f); // |
| simon | 0:f42b25503fd1 | 60 | command(0x3f); // |
| simon | 0:f42b25503fd1 | 61 | command(0x3f); // |
| simon | 0:f42b25503fd1 | 62 | command(0xaf); // display on |
| simon | 0:f42b25503fd1 | 63 | command(0xa4); // display on |
| simon | 0:f42b25503fd1 | 64 | |
| simon | 0:f42b25503fd1 | 65 | wait_us(10); |
| simon | 0:f42b25503fd1 | 66 | |
| simon | 0:f42b25503fd1 | 67 | _power = 1; |
| simon | 0:f42b25503fd1 | 68 | } |
| simon | 0:f42b25503fd1 | 69 | |
| simon | 0:f42b25503fd1 | 70 | #define OLED_DISPLAY_WIDTH 96 |
| simon | 0:f42b25503fd1 | 71 | #define OLED_DISPLAY_HEIGHT 64 |
| simon | 0:f42b25503fd1 | 72 | |
| simon | 0:f42b25503fd1 | 73 | void EAOLED::pixel(int x, int y, int colour) { |
| simon | 0:f42b25503fd1 | 74 | int page = y >> 3; |
| simon | 0:f42b25503fd1 | 75 | int address = 18 + x; |
| simon | 0:f42b25503fd1 | 76 | |
| simon | 0:f42b25503fd1 | 77 | int lo = (address >> 0) & 0x0F; |
| simon | 0:f42b25503fd1 | 78 | int hi = (address >> 4) | 0x10; |
| simon | 0:f42b25503fd1 | 79 | int mask = 1 << (y & 0x7); |
| simon | 0:f42b25503fd1 | 80 | int byte = page * OLED_DISPLAY_WIDTH + x; |
| simon | 0:f42b25503fd1 | 81 | |
| simon | 0:f42b25503fd1 | 82 | if(colour) { |
| simon | 0:f42b25503fd1 | 83 | framebuffer[byte] |= mask; |
| simon | 0:f42b25503fd1 | 84 | } else { |
| simon | 0:f42b25503fd1 | 85 | framebuffer[byte] &= ~mask; |
| simon | 0:f42b25503fd1 | 86 | } |
| simon | 0:f42b25503fd1 | 87 | |
| simon | 0:f42b25503fd1 | 88 | command(0xB0 + page); |
| simon | 0:f42b25503fd1 | 89 | command(lo); |
| simon | 0:f42b25503fd1 | 90 | command(hi); |
| simon | 0:f42b25503fd1 | 91 | data(framebuffer[byte]); |
| simon | 0:f42b25503fd1 | 92 | } |
| simon | 0:f42b25503fd1 | 93 | |
| simon | 0:f42b25503fd1 | 94 | /*void EAOLED::cls() { |
| simon | 0:f42b25503fd1 | 95 | for(int y=0; y<64; y++) { |
| simon | 0:f42b25503fd1 | 96 | for (int x=0; x<96; x++) { |
| simon | 0:f42b25503fd1 | 97 | pixel(x, y, 0xFFFFFF); |
| simon | 0:f42b25503fd1 | 98 | } |
| simon | 0:f42b25503fd1 | 99 | } |
| simon | 0:f42b25503fd1 | 100 | }*/ |
| simon | 0:f42b25503fd1 | 101 |