Solved
.ioc init sequence. I have cubeIDE v1.7.0, but uart3 is still initialised before DMA and this caused me hours trying to sort out a simple problem.
STM32CubeG4 Firmware Package V1.1.0 / 28-June-2019
Question with a best answer.
Best Answer
This was reported in another thread and I wrote a ticket about it at that time. It will be fixed in an upcoming release.
by Markus GIRDLAND (ST Employee)