[riot-notifications] [RIOT-OS/RIOT] sys/stdio_uart: Add warning about use in ISR (#13985)

Marian Buschsieweke notifications at github.com
Mon May 4 14:05:21 CEST 2020

> It would sure be possible to always re-initialize the PLL when when a interrupt has triggered a wake-from sleep, we are still in control of the IRQ handler (which would of course delay that interrupt - depends on the application if that is acceptable).

Note that RIOT is intended to be used as general purpose OS. Doing so would conflict with this.

Btw: What are the use cases for STDIO access during ISR except for debugging? IMO, we should just add the warning and spend our time on more pressing stuff.

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