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[STM32] Rectify IRQ Handling for Serial Devices #4780

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Commits on Jul 19, 2017

  1. Rectify IRQ handling

    - clear `TxIrq` before calling `irq_handler()`
    - do not clear `RxIrq` but delegate this to `irq_handler()`
      (which can do this by simply calling `serial_getc()`)
    - use correct mask when checking if `TxIrq` is enabled
    betzw committed Jul 19, 2017
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