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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

2.0.3

Fixed

  • The row scan timing was too long on ESP32 platforms. Adjusted this timing to remove visible blinking.
  • Fixed Color Gradient example so thatit propery compiles.

2.0.2

Added

  • Added a platformio.ini file to aid in the development of this library using hte Platform IO environment. This is only useful for developing this library itself, and not at all used for using this library in your projects.
  • Added support for Teensy 4.x boards

2.0.1

Added

  • Specify library dependencies in library.properties

Changed

  • Moved methods for accessing raw pixel color values to the AdaFruit GFX library. This has no net change to the user, but improves the architecture of the code. Depends on pull request #237 in the AdaFruit GFX repository, which was incorporated in v1.9.0 of the GFX library.

2.0.0

Changed

  • Transition library to use Adafruit's GFX Library to handle the graphics API. The befit of this is that it immediately brings a wealth of functionality pertaining to the programatic construction of the image, especially fonts and text drawing. The Adafruit GFX library is only used for the primary image buffer. The backend operations of the driver (i.e., the secondary buffer for the shift register bits) is still the same. This is a significant change to the library, likely requiring you to change your code. In the process, dropped support for simulating gray scale on monochrome LED matrices. This might be brought back later.

Fixed

  • Added 3 micro-seconds of inter-scan blank time to the 16x16 CPRG examples to give the hardware some tiem to drain the parasitic capacitance from the LEDs.
  • Adjust the Teensy scan rate faster as under some circumstances subtle scan blinking was perceptible.
  • Corrected the binary code modulation implementation.

1.2.0 - 2018-12-24

Fixed

  • Correct the code for the 4x4 matrix example

Changed

  • Removed ESP8266 and 8 bit AVR microcontrollers for list officially supported for 12-bit color. This was done primarily due to realistic assessment of their computational speed.

Added

  • Support for the "Common Power Row Groups" matrix layout outs. This layout is intended for matrices with a large number of rows, too large to effectively doe a single pass scan. With this layout, rows are grouped together into row groups and corresponding rows between each group are powered together through the same switching transistor. For example, in a 16 row matrix that is split up into groups of 8, rows 1 and 9 are powered together, and so on. As a result of row groups each having a row powered simultaneously, the columns are independently controlled in each row group. For now, the only layout supported with this scheme are ones with arow groups of size 8 and columns within each group use the RGB grouping bit layout.
  • Support for sending a blank single to the shift registers on demand.

1.1.1 - 2018-12-24

Changed

  • Updated the Conway Game of Life example to auto-reset itself it the game evolves to a static, unchanging state.

Added

  • Basic capability to specify the endian-ness of the column layout for a matrix. While column 0 is meant to indicate the left most column, the hardware layout of the matrix might not make the left most column the MSB in the shift register chain. This might happen if you make a mistake in your hardware (oops!). By setting the column endian value of the matrix,the high level software can still reference column 0 to mean the left most column, and the bit layout sent the shift registers will be adjusted according to where column 0 physically is in the hardware.
  • Added support for ESP32 microcontrollers.

1.1.0 - 2018-02-09

Changed

  • Refactored the image classes to have a common, templated base class. This consolidates similar logic to a single location. This caused the existing Glyph object to have it's API slightly changed.
  • Improved interrupt handling on 8-bit AVR microcontrollers

Added

  • Support for the Arduino Zero and Due boards (and related)
  • Support for older ATmega8535, ATmega16 and ATmega32 microcontrollers
  • Support for ATmega1284 and ATmega1284P microcontrollers
  • A method to LEDImage for drawing circles
  • A Red-Blue-Green bit layout mode for the RGB matrix object
  • An option to shift out an "all off" signal for a short period of time in between row updates to the shift registers. This helps mitigate LED ghosting when the time to turn off for the row power switch is appreciable and cannot be mitigated in hardware. For example, when using 2981 source drivers for the row power switching, which requires 2 microseconds to turn off.
  • Added support for a "gray scale" LED matrix. This is a mono-color LED matrix where PWM is used to effect varying intensity in each LED.

1.0.1 - 2017-12-24

Changed

  • Adjusted the aesthetics of the classic plasma visualization example code

Fixed

  • Corrected failure to compile for boards that can only use 6-bit color.

1.0.0 - 2017-12-24

Initial release