The code did not check at deinit whether a UART was initialized. That did
not matter for all MCU's except MIMXRT1176, which crashes at the second
soft reset in a row.
But since it is a general problem to use UART methods of a UART which has
been deinitialized, checks were added to all applicable methods for a clear
response instead of e.g. a crash.
Deinitialize UART using software reset. It resets the UART but keeps it
accessible for software, avoiding an exception when UART registers are
accessed after a DeInit.
Signed-off-by: robert-hh <robert@hammelrath.com>
ce38784fa8