Add refactored support for Sparkfun Pro Micro#178

Merged

Rahix merged 8 commits intoRahix:nextfrom explicite:sparkfun-pro-micro

May 1, 2021

+332-1

Commits on Apr 25, 2021

sparkfun-mod
explicite
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Commits on Apr 26, 2021

Commits on Apr 27, 2021

Update examples/sparkfun-promicro/src/bin/promicro-blink.rs

explicite
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