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How to check if UART TX is complete?

Question asked by misterdsp on Dec 20, 2013
Latest reply on Jan 3, 2014 by Kilohercas

What I need to know is when any UART transmission is finished and the UART can be reconfigured or turned off. Do any register status bits tell me that?

The UART0LSR register bit UARTTEMT might do it, test ==1?