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Hardwareserial: Disable interrupts while setting TXC bit #6685

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Component: HardwareSerialThe hardware serial functionality of the core libraries Type: DuplicateAnother item already exists for this topic
@NicoHood

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As discussed here the TXC bit setting should be atomic. Otherwise other (non usart) interrupts may corrupt the hardwareserial flush() function.

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    Component: HardwareSerialThe hardware serial functionality of the core libraries Type: DuplicateAnother item already exists for this topic

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