Toon Stegen ac1d1ffda2 cpu/stm32_common: enable/disable uart peripheral
in uart_poweroff the peripheral should be disabled through the register
instead of just disabling the peripheral clock. In uart_poweron the
peripheral should be enabled after enabling the clock.

Not explicitely disabling the peripheral causes some bad signals on the
uart line sometimes.
2019-08-27 19:09:36 +02:00
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