manitou48

Sorry, I’m not real sure of the importance of those flags. Most the DMA code was lifted from SDFat library. You might check with the author of that library, or...

You chose a convenient example where ii is 1. the minpresc in the register should have values of 0, 1,2,4,8,16 32 ... your current example, i don't think will set...

The same hang occurs at SD.open() in play_sd_raw.cpp. The PR #294 does not consider problem in play_sd_raw.cpp