With the old logic if Serial::writeable() was called before and/or used ... #778
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…ed to block calls to Serial::putc() it would never write due to EVENT_TXDRDY trailing a write to TXD. Add a dummy write to TXD before pins are connected to the peripheral. This primes the EVENT_TXDRDY to lead future writes rather than trail. Since STOPTX isn't used this seems safe.
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Targets: NRF51822 - With the old logic if Serial::writeable() was called before and/or used ...
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...to block calls to Serial::putc() it would never write due to EVENT_TXDRDY trailing a write to TXD. Add a dummy write to TXD before pins are connected to the peripheral. This primes the EVENT_TXDRDY to lead future writes rather than trail. Since STOPTX isn't used this seems safe.