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HardwareSerial improvements#1711

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Commits on Dec 18, 2013

• Remove duplicate code from HardwareSerial::begin() methods.

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• Remove unused variable

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• Simplify HardwareSerial::begin()

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• Define a _NOP() macro

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• Use constants for register bit positions in HardwareSerial

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• Move interrupt handlers into HardwareSerial class

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• Use bit_is_clear in HardwareSerial::flush()

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• Improve HardwareSerial::flush()

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• Fix HardwareSerial::flush() when interrupts are kept disabled for a while

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• Fix lockup when writing to HardwareSerial with interrupts disabled

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• Disable the UDRE interrupt sooner in HardwareSerial

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• Centrally decide which hardware UARTS are available

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• Put each HardwareSerial instance in its own .cpp file

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• Make all access to the HardwareSerial ringbuffers atomic

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• In HardwareSerial::write, bypass the queue when it's empty

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