Function set_bcr_manual 

pub unsafe fn set_bcr_manual(ch: Channel, words: u16)

👎Deprecated:

use the unsafe dma::start with dma::size_words, or dma::raw::set_size for probes

Write the size register in manual / linked-list mode: just a 16-bit word count.

Safety

The value arms or starts a transfer on ch; see start’s contract.