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131 lines
3.2 KiB
Markdown
131 lines
3.2 KiB
Markdown
# OLED for AVR mikrocontrollers
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Library for oled-displays with SSD1306, SSD1309 or SH1106 display-controller connected with I2C or SPI at an AVR Atmel Atmega like Atmega328P.
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<img src="https://github.com/Sylaina/oled-display/blob/master/oled.jpg?raw=true" width="500">
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This library allows you to display text or/and graphic at oled-display.
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The library need less than 2 kilobytes flash-memory and 3 bytes sram in textmode, in graphicmode library need less than 3 kilobytes flash-memory and 1027 bytes static sram so you can use oled-displays e.g with Atmega48PA (only with textmode).
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Library is only tested with 128x64 Pixel display, lower resolution not tested but should work too.
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If you want to use your own I2C library you have to fit i2c-function at lcd-library.
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Settings for I2C-bus have to set at i2c.h
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Settings for display have to set at lcd.h
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If you want to use characters like e.g. ä set your compiler input-charset to utf-8 and your compiler exec-charset to iso-8859-15 (look at makefile line 115).
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Testcondition: Display: SSD1306 OLED, Compiler Optimizelevel: -Os, µC: Atmega328p @ 8 MHz internal RC
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Memory:
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<table>
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<tr>
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<th>Modul</th>
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<th>Flash</th>
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<th>Static RAM</th>
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</tr>
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<tr>
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<td>I2C-Core</td>
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<td>220 Bytes</td>
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<td>0 Bytes</td>
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</tr>
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<tr>
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<td>FONT</td>
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<td>644 Bytes</td>
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<td>0 Bytes</td>
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</tr>
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<tr>
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<td>OLED (Text-Mode)</td>
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<td>1395 Bytes</td>
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<td>3 Bytes</td>
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</tr>
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<tr>
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<td>OLED (Graphic-Mode)</td>
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<td>2541 Bytes</td>
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<td>1027 Bytes</td>
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</tr>
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</table>
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Speed (print 20 charaters (1 line) in normal size to display):
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<table>
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<tr>
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<th>Mode</th>
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<th>Time</th>
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<th>I2C-Speed</th>
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</tr>
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<tr>
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<td>OLED (Text-Mode)</td>
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<td>4.411 ms</td>
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<td>400 kHz</td>
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</tr>
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<tr>
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<td>OLED (Text-Mode)</td>
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<td>15.384 ms</td>
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<td>100 kHz</td>
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</tr>
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<tr>
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<td>OLED (Graphic-Mode)</td>
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<td>26.603 ms</td>
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<td>400 kHz</td>
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</tr>
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<tr>
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<td>OLED (Graphic-Mode)</td>
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<td>96.294 ms</td>
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<td>100 kHz</td>
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</tr>
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</table>
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example:
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```c
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//****main.c****//
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#include "lcd.h"
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int main(void){
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lcd_init(LCD_DISP_ON); // init lcd and turn on
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lcd_puts("Hello World"); // put string from RAM to display (TEXTMODE) or buffer (GRAPHICMODE)
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lcd_gotoxy(0,2); // set cursor to first column at line 3
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lcd_puts_p(PSTR("String from flash")); // puts string form flash to display (TEXTMODE) or buffer (GRAPHICMODE)
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#if defined GRAPHICMODE
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lcd_drawCircle(64,32,7,WHITE); // draw circle to buffer
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lcd_display(); // send buffer to display
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#endif
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for(;;){
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//main loop
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}
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return 0;
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}
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```
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example for chars with double height:
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```c
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//****main.c****//
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#include "lcd.h"
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int main(void){
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lcd_init(LCD_DISP_ON);
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lcd_clrscr();
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lcd_set_contrast(0x00);
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lcd_gotoxy(4,1);
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lcd_puts("Normal Size");
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lcd_charMode(DOUBLESIZE);
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lcd_gotoxy(0,4);
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lcd_puts(" Double \r\n Size");
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lcd_charMode(NORMALSIZE);
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#ifdef GRAPHICMODE
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lcd_display();
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#endif
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for(;;){
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//main loop
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}
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return 0;
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}
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```
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<img src="https://github.com/Sylaina/oled-display/blob/master/bigchars.JPG?raw=true" width="500">
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