Solved occasional UART corruption issue. HCLK DAC setting overflow (31-->32) was the issue.
Timing issue outstanding after merge. Channel 11 should work but some channels are being skipped. Issue under investigation.
Otherwise merged changes are working https://github.com/PisterLab/scum-test-code/tree/develop/scm_v3c/applications/channel_cal. Also merged into main branch!
@Fil Maksimovic exchanged 2 erroneous boards with 2 fully functional boards