2.1 Display Specific Drivers
The display specific drivers provides an interface to the graphical display. It implements the low-level communication with the display hardware, putting pixels on the display and drawing primitives such as lines, circles, and rectangles. Depending on the display driver implementation, drawing the graphics primitives might be handled by the generic graphics drawing primitives rather than the display driver itself.
In this example, the display specific drivers are implemented in gfx_mono_ug_2832hsweg04.h and gfx_mono_ug_2832hsweg04.c.
The driver functions are listed below:
| Functions | Description |
|---|---|
| gfx_mono_ssd1306_draw_pixel() | Draw pixel to screen |
| gfx_mono_ssd1306_get_byte() | Get a byte from the display controller RAM |
| gfx_mono_ssd1306_get_page() | Read a page from the LCD controller |
| gfx_mono_ssd1306_get_pixel() | Get the pixel value at x,y |
| gfx_mono_ssd1306_init() | Initialize the SSD1306 controller and LCD display |
| gfx_mono_ssd1306_mask_byte() | Read/Modify/Write a byte on the display controller |
| gfx_mono_ssd1306_put_byte() | Put a byte to the display controller RAM |
| gfx_mono_ssd1306_put_framebuffer() | Put frame-buffer to the LCD controller |
| gfx_mono_ssd1306_put_page() | Put a page from RAM to the display controller |
#define gfx_mono_put_byte(page, column, data) \
gfx_mono_ssd1306_put_byte(page, column, data, false)
#define gfx_mono_get_byte(page, column) \
gfx_mono_ssd1306_get_byte(page, column)They are the interface to the GFX library.
The low-level display driver is located at ASF\common\components\display\ssd1306.h/c, the SPI communication with OLED specific commands are handled here. The display specific drivers mentioned above will finally call the low-level drivers to access the OLED controller.
To use GFX library on a new display device, low-level display drivers should be changed accordingly.