Support for SAMD21 mcu

[sslupsky]

Any plans to support the samd21 mcu?

[feilipu]

The SAMD21 is already supported by FreeRTOS. 👍

But since the SAMD21 is not an AVR device, it is unlikely that this repo will support it.

[sslupsky]

Unfortunately, FreeRTOS does not fully support Tickless for SAMD21 or any other core M0 device for that matter. Thanks for the feedback.