I'm trying to get ADCHS / HSADC up and running using an automated update of the descriptor tables. The user's manual section 48.7.3 states "when swapping tables a DMA request can be raised to enable the DMA to load a new table [..]". In fact, using the "SWAP tables" bits in the descriptor table, no DMA write request is fired. However, setting the DMA_REQ_WR bit fires a request and the descriptor table is updated.
How can an automatic DMA based reload of the descriptor tables be archieved?