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Fix uart tx test #1801

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Fix uart tx test #1801

wants to merge 1 commit into from

Commits on Jun 6, 2016

  1. [STM32] Ensure UART Tx completion 

    As explained in UART of STM32 reference manuals:
After writing the last data into the USART_DR register,
it is mandatory to wait for TC=1 before disabling the USART or causing
the microcontroller to enter the low-power mode.
    @LMESTM
    LMESTM committed Jun 6, 2016
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