Use bit_is_clear in HardwareSerial::flush()
This is slightly more clear than the previous explicit comparison.
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@ -332,7 +332,7 @@ int HardwareSerial::read(void)
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void HardwareSerial::flush()
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{
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// UDR is kept full while the buffer is not empty, so TXC triggers when EMPTY && SENT
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while (transmitting && ! (*_ucsra & _BV(TXC0)));
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while (transmitting && bit_is_clear(*_ucsra, TXC0));
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transmitting = false;
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}
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