Added GCC port files for AVR Mega0 and AVR Dx. #101
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yuhui-zheng
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Leaving a note for other reviewers.
We brought in a third party GCC port for ATmega device family earlier this year -- https://github.com/FreeRTOS/FreeRTOS-Kernel/tree/master/portable/ThirdParty/GCC/ATmega. This is almost identical to what users can get from Arduino IDE library manager.
The two ports here are similar to both the third party port above and legacy ATmega323, in terms of context switch routine, interrupt setup, and many etc. The difference here though, each port in this PR provides generic tick timer init macro function for the target MCU. (Generic timer counter, RTC. No watchdog yet.) I think this is cleaner.
The only differences between AVR Dx port and ATmega0 port are:
- RAMPZ register is used in task context,
- MCU specific timer.
diff should show above.
Approving since the ports are identical to the port we worked on in private repo.
Portable files for AVR Mega0 and AVR Dx families using GCC compiler
Description
Mainly implements the context switching and tick generation. Several tick sources are available.
Test Steps
Use the related Atmel Studio projects that will be added to the FreeRTOS repo by another PR. These projects include a blinky example and a "minimal" and "full" test scenarios
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