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MrKevinWeiss 96f8438ea2 cpu/stm32_common/uart: Prevent uart from sending if not initialized
Due to the stdio getting called after periph_init the uart may send before initialized.
This adds a simple check so the uart does not get into a locked-up state.
2018-12-18 10:16:50 +01:00
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2018-09-11 16:32:34 +02:00
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