5.0.0

• Updated Arduino AVR core to v1.8.6 (#314)
• Updated MCUdude's cores (#320):
  • MajorCore v3.0.0 (release notes)
  • MegaCore v3.0.0 (release notes)
  • MightyCore v3.0.0 (release notes)
  • MiniCore v3.0.0 (release notes)
• MCUdude cores switched to AVRDUDE v7.2
• Added initial support for the Urboot bootloader for MigntyCore, MiniCore, MegaCore, or MajorCore (#321)
• Fixed an issue with excessive quotes when path to AVRDUDE contains a whitespace character (#297)

Thanks @MCUdude, @thijses for great contributions!

4.2.0

• Updated MCUdude's cores (#302):
  • MajorCore v2.2.2 (release notes)
  • MegaCore v2.2.3 (release notes)
  • MightyCore v2.2.2 (release notes)
  • MiniCore v2.2.2 (release notes)
  • MicroCore v2.3.0 (release notes)
• Added initial support for the Urboot bootloader for MicroCore (#311)
• Fixed an issue with missing tool-avrdude package when bootloader target is selected (#269)

Thanks @MCUdude for your great contributions!

4.1.0

• Add support for ATmegaxx5/xx50 and ATmegaxx9/xx90 chip families (#287):
  • ATmega165, ATmega165P, ATmega169A, ATmega169P, ATmega325, ATmega3250, ATmega3250P, ATmega325P, ATmega329, ATmega3290, ATmega3290P, ATmega329P, ATmega645, ATmega6450, ATmega6450P, ATmega649, ATmega645P, ATmega649, ATmega6490, ATmega6490P, ATmega649P,
• Updated MCUdude's cores (#302):
  • MajorCore v2.2.1 (release notes)
  • MegaCore v2.2.2 (release notes)
  • MightyCore v2.2.1 (release notes)
  • MiniCore v2.2.1 (release notes)
• MCUdude cores switched to AVRDUDE v7.1

Thanks @MCUdude for your great contributions!

4.0.1

• Removed simulators from "onboard debug" list

4.0.0

• Added compatibility with PIO Core 6.0
• Improved support for bare assembly programming
• Fixed broken configuration defines for several boards from ATTinyCore (#264, #265, #255)

Notes on deprecating the Simba framework:

This release deprecates support for the Simba framework as it's no longer maintained for this platform. To keep projects based on this framework compilable please lock the platform version to v3.4.0 in your platformio.ini file, for example:

[env:simba-legacy]
platform = atmelavr @ ~3.4.0
framework = simba
board = ...

3.4.0

• Updated MCUdude's cores:
  • MajorCore v2.1.3 (release notes)
  • MegaCore v2.1.3 (release notes)
  • MightyCore v2.1.3 (release notes)
  • MiniCore v2.1.3 (release notes)
  • MicroCore v2.1.0 (release notes)
• Updated simavr packages to v1.7.0
• Fixed default clock source for several boards from ATTinyCore (#255)
• Fixed memory sizes for SparkFun ATmega128RFA1 Dev Board (#257)

3.3.0

• Updated ATTinyCore to the latest v1.5.2 (release notes)
• Removed unnecessary wrapping quotes from the avrdude upload command (#246)
• Minor improvements

3.2.0

• Updated MCUdude's cores (#241):
  • MajorCore v2.1.0 (release notes)
  • MegaCore v2.1.0 (release notes)
  • MightyCore v2.1.0 (release notes)
  • MiniCore v2.1.0 (release notes)
  • MicroCore to v2.0.3 (release notes)
• digispark boards were switched to Arduino core by @ArminJo and updated micronucleus tool (#239)
• The default toolchain switched to GCC v7.3.0 (#224)
• Minor fixes and improvements

3.1.0

• Updated MicroCore to v2.0.2 (release notes)
• The bootloader size for MCUdude's cores is now calculated dynamically (#207, #217)
• Minor fixes and improvements

Minor releases of MCUdude's cores:

• MightyCore v2.0.8 (release notes)
• MiniCore v2.0.9 (release notes)
• MegaCore v2.0.6 (release notes)
• MajorCore v2.0.5 (release notes)

3.0.0

• Updated cores:
  • Arduino AVR v1.8.3
  • MightyCore v2.0.6 (release notes)
  • MiniCore v2.0.7 (release notes)
  • MegaCore v2.0.4 (release notes)
  • MajorCore v2.0.3 (release notes)
  • MicroCore v1.0.7 (release notes)
• Added initial support for avr-stub debug tool based on avr_debug GDB stub (special thanks to @msquirogac) (#205)
• Improved support for more flexible fuses and bootloader programming. More information with examples in the docs
• Minor fixes and improvements (issues #201, #203, #206)

Note

This release deprecates the program target used for uploading firmware via an external programmer.
Instead a custom upload_command option should be used.