esp8266-oled-ssd1306
This is a driver for the SSD1306 based 128x64 pixel OLED display running on the Arduino/ESP8266 platform.
You can either download this library as a zip file and unpack it to your Arduino/libraries folder or (once it has been added) choose it from the Arduino library manager.
Credits
Many thanks go to Fabrice Weinberg (@FWeinb) for optimizing and refactoring the UI library. The init sequence for the SSD1306 was inspired by Adafruits library for the same display.
Usage
The SSD1306Demo is a very comprehensive example demonstrating the most important features of the library.
Features
- Draw pixels at given coordinates
- Draw or fill a rectangle with given dimensions
- Draw Text at given coordinates:
- Define Alignment: Left, Right and Center
- Set the Fontface you want to use (see section Fonts below)
- Limit the width of the text by an amount of pixels. Before this widths will be reached, the renderer will wrap the text to a new line if possible
- Display content in automatically side scrolling carousel
- Define transition cycles
- Define how long one frame will be displayed
- Draw the different frames in callback methods
- One indicator per frame will be automatically displayed. The active frame will be displayed from inactive once
Fonts
Fonts are defined in a proprietary but open format. You can create new font files by choosing from a given list of open sourced Fonts from this web app: http://oleddisplay.squix.ch Choose the font family, style and size, check the preview image and if you like what you see click the "Create" button. This will create the font array in a text area form where you can copy and paste it into a new or existing header file.
API
Display Control
// Create the display object connected to pin sda and sdc
SSD1306(int i2cAddress, int sda, int sdc);
// Initialize the display
void init();
// Free the memory used by the display
void end();
// Cycle through the initialization
void resetDisplay(void);
// Connect again to the display through I2C
void reconnect(void);
// Turn the display on
void displayOn(void);
// Turn the display offs
void displayOff(void);
// Clear the local pixel buffer
void clear(void);
// Write the buffer to the display memory
void display(void);
// Inverted display mode
void invertDisplay(void);
// Normal display mode
void normalDisplay(void);
// Set display contrast
void setContrast(char contrast);
// Turn the display upside down
void flipScreenVertically();
Pixel drawing
void setColor(SSD1306_COLOR color);
// Draw a pixel at given position
void setPixel(int16_t x, int16_t y);
// Draw the border of a rectangle at the given location
void drawRect(int16_t x, int16_t y, int16_t width, int16_t height);
// Fill the rectangle
void fillRect(int16_t x, int16_t y, int16_t width, int16_t height);
// Draw a line horizontally
void drawHorizontalLine(int16_t x, int16_t y, int16_t length);
// Draw a line vertically
void drawVerticalLine(int16_t x, int16_t y, int16_t length);
// Draw a bitmap in the internal image format
void drawFastImage(int16_t x, int16_t y, int16_t width, int16_t height, const char* image);
// Draw a XBM
void drawXbm(int16_t x, int16_t y, int16_t width, int16_t height, const char* xbm);
Text operations
void drawString(int16_t x, int16_t y, String text);
// Draws a String with a maximum width at the given location.
// If the given String is wider than the specified width
// The text will be wrapped to the next line at a space or dash
void drawStringMaxWidth(int16_t x, int16_t y, int16_t maxLineWidth, String text);
// Returns the width of the const char* with the current
// font settings
uint16_t getStringWidth(const char* text, uint16_t length);
// Specifies relative to which anchor point
// the text is rendered. Available constants:
// TEXT_ALIGN_LEFT, TEXT_ALIGN_CENTER, TEXT_ALIGN_RIGHT, TEXT_ALIGN_CENTER_BOTH
void setTextAlignment(SSD1306_TEXT_ALIGNMENT textAlignment);
// Sets the current font. Available default fonts
// ArialMT_Plain_10, ArialMT_Plain_16, ArialMT_Plain_24
// Or create one with the font tool at http://oleddisplay.squix.ch
void setFont(const char* fontData);
Ui Library (SSD1306Ui)
The Ui Library is used to provide a basic set of Ui elements called, Frames
and Overlays
. A Frame
is used to provide
information the default behaviour is to display a Frame
for a defined time and than move to the next. The library also provides an Indicator
that will be updated accordingly. An Overlay
on the other hand is a pieces of information (e.g. a clock) that is displayed always at the same position.
/**
* Initialise the display
*/
void init();
/**
* Configure the internal used target FPS
*/
void setTargetFPS(uint8_t fps);
/**
* Enable automatic transition to next frame after the some time can be configured with
* `setTimePerFrame` and `setTimePerTransition`.
*/
void enableAutoTransition();
/**
* Disable automatic transition to next frame.
*/
void disableAutoTransition();
/**
* Set the direction if the automatic transitioning
*/
void setAutoTransitionForwards();
void setAutoTransitionBackwards();
/**
* Set the approx. time a frame is displayed
*/
void setTimePerFrame(uint16_t time);
/**
* Set the approx. time a transition will take
*/
void setTimePerTransition(uint16_t time);
/**
* Draw the indicator.
* This is the default state for all frames if
* the indicator was hidden on the previous frame
* it will be slided in.
*/
void enableIndicator();
/**
* Don't draw the indicator.
* This will slide out the indicator
* when transitioning to the next frame.
*/
void disableIndicator();
/**
* Set the position of the indicator bar.
*/
void setIndicatorPosition(IndicatorPosition pos);
/**
* Set the direction of the indicator bar. Defining the order of frames ASCENDING / DESCENDING
*/
void setIndicatorDirection(IndicatorDirection dir);
/**
* Set the symbol to indicate an active frame in the indicator bar.
*/
void setActiveSymbol(const char* symbol);
/**
* Set the symbol to indicate an inactive frame in the indicator bar.
*/
void setInactiveSymbol(const char* symbol);
/**
* Configure what animation is used to transition from one frame to another
*/
void setFrameAnimation(AnimationDirection dir);
/**
* Add frame drawing functions
*/
void setFrames(FrameCallback* frameFunctions, uint8_t frameCount);
/**
* Add overlays drawing functions that are draw independent of the Frames
*/
void setOverlays(OverlayCallback* overlayFunctions, uint8_t overlayCount);
/**
* Set the function that will draw each step
* in the loading animation
*/
void setLoadingDrawFunction(LoadingDrawFunction stage);
/**
* Run the loading process
*/
void runLoadingProcess(LoadingStage* stages, uint8_t stagesCount);
// Manuell Controll
void nextFrame();
void previousFrame();
// State Info
SSD1306UiState* getUiState();
// This needs to be called in the main loop
// the returned value it the remaining time (in ms)
// you have to draw after drawing to keep the frame budget.
int8_t update();
Example: SSD1306Demo
Frame 1
This frame shows three things:
- How to draw an xbm image
- How to draw a static text which is not moved by the frame transition
- The active/inactive frame indicators
Frame 2
Currently there are one fontface with three sizes included in the library: Arial 10, 16 and 24. Once the converter is published you will be able to convert any ttf font into the used format.
Frame 3
This frame demonstrates the text alignment. The coordinates in the frame show relative to which position the texts have been rendered.
Frame 4
This shows how to use define a maximum width after which the driver automatically wraps a word to the next line. This comes in very handy if you have longer texts to display.