[riot-notifications] [RIOT-OS/RIOT] boards: add adafruit-itsybitsy-m4 (#15845)

benpicco notifications at github.com
Sun Jan 24 18:23:09 CET 2021

@benpicco commented on this pull request.

> @@ -0,0 +1,6 @@
+# Include all definitions for flashing with bossa other USB
+include $(RIOTBOARD)/common/samd21-arduino-bootloader/Makefile.include

Yea naming things is hard.
I think Adafruit calls it `samdx1-bootloader`. Should I rename it as part of this PR or do a separate clean-up PR as a follow-up?

> but is samd51 really a sam0

That's a philosophical question. In RIOT, sam0 means the second (and third) Generation of Atmel's Cortex-M MCUs characterized mostly by their SERCOM peripherals and GCLK system.

That includes

 - `cpu/samd21`: The original Cortex-M0+ parts from which the sam0 name derives. You will be delighted to learn that this also includes SAM D10/11 along with SAM D20.
 - `cpu/saml21`: The next iteration of Cortex-M0+ parts, slight changes in peripherals/clocking that are shared with all following chips
 - `cpu/saml1x`: Basically `saml21` with a Cortex-M23
 - `cpu/samd5x`: Basically `saml21` with a Cortex-M4F and more peripherals (Oh there is only SAM D51, but SAM E51 - E54 exists)

Naming things is hard.

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