[quote user="YiKai Chen"]
Set ihe TX/RX pin to GPI with tri-state once you do not need UART. Re-init UART when you want to use it.
[/quote]
Is the power really related just to the pin configuration? I'm not loading the Tx at all, and Rx sits at a clean high. I'm wondering if I should try "disarming" the DMA. Is there something that keeps running as long as the Rx and Tx DMA channels are armed?
Thanks.