Fix for Serial flush() returning before transmission has completed #328
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Renamed tx_done to tx_empty Created tx_complete
Separated call back events UART_EVENT_TX_COMPLETE and UART_EVENT_TX_DATA_EMPTY and used UART_EVEN_TX_COMPLETE to determine when flush() should return
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per1234
added
type: imperfection
Removed old comment
Added a timeout to flush() because BLE.begin() on the Uno R4 Wifi, would hang without it.
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Problem: flush() would return when the transmission buffer was empty, but the txBuffer was not being used so flush() would return straight away. write() would wait until it had sent all bytes to the UART before returning, but there would still be bytes in the UART that had not been sent, so it would return 1-11 bytes early
Fix: Used the UART_EVENT_TX_COMPLETE call back to determine when the UART has finished transmitting and use this to determine when flush() should return