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Library for control 8x8 LED matrices using MAX7219 / MAX7221. Uses Adafruit GFX library.
Device OS Version:
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Spark Core library for control 8x8 LED matrices using MAX7219 / MAX7221.
- uses Adafruit_GFX library which provides basic graphics methods
(draw/fill circles, triangles, chars, etc.)
- allows to set transformations (rotating, mirroring) and position for each display
- provides direct access to the whole bitmap, independent on display transformations
- transformation buffers and flushing whole bitmap at once avoid flickering
- possible to choose pins for CLK, CS, D_OUT (= CLK, SS, MOSI)
- bitmaps are implemented as bit arrays for minimalizing memory usage
(some memory has been sacrificed for trans. buffers and direct access to the unchanged bitmap)
Using with Spark WEB IDE
- Include library LEDMATRIX-MAX7219-MAX7221
Using with Spark Dev
- Create a project folder.
- The folder must contains ledmatrix-max7219-max7221.cpp, ledmatrix-max7219-max7221.h
and Adafruit_GFX.cpp, Adafruit_GFX.h, glcdfont.cpp from SparkCore-Adafruit-GFX-Library
(everything included in firmware folder).
- Include license.txt and text required by Adafruit GFX library.
1) Include header file:
2) Create instance:
// 1 display per row, 1 display per column // optional pin settings - default: CLK = A0, CS = A1, D_OUT = A2 // (pin settings is independent on HW SPI) LEDMatrix *led = new LEDMatrix(1, 1, A0, A1, A2);
3) Setup matrices:
// > add every matrix in the order in which they have been connected < // the first matrix in a row, the first matrix in a column // vertical orientation (270°) and no mirroring (x, y axes) - last three args optional led->addMatrix(0, 0, 270, false, false);
It is possible to use almost all inhereted methods from Adafruit_GFX library:
led->fillCircle(5, 3, 2, true);
Use built-in methods:
// set intensity of the third display (0-15) led->setIntensity(7, 2); // invert displays led->invert(); // shutdown all displays led->shutdown(true);
Direct access to the bitmap:
// turn off pixel led->bitmap->setPixel(3, 1, false); bool val = led->bitmap->getPixel(3, 1); led->bitmap->togglePixel(3, 1); led->bitmap->getWidth(); led->bitmap->getHeight();
Pixel changes do not take effect immediately. Update displays:
You can shutdown display(s):
And free memory:
heart.ino contains the implementation of a simple scrolling text and function for drawing a heart symbol.
Suggestions for new features, reporting bugs and other contributions will be very much appreciated!
This is the core graphics library for all our displays, providing a common set of graphics primitives (points, lines, circles, etc.). It needs to be paired with a hardware-specific library for each display device we carry (to handle the lower-level functions). Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, check license.txt for more information.