avoid getting stuck in serial IRQ if ORE is set without RXNE #1608
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avoid getting stuck in serial IRQ if ORE is set without RXNE
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Fixes #1605
Applications may encounter situations where UARTx->SR & ORE is true but UARTx->SR & RXNE is not true. If this occurs when a RX interrupt handler is attached, the device will get stuck in a loop executing the serial irq handler. This is because the ORE flag can trigger the RXNE interrupt as well as the RXNE flag.