Some were, some weren't. They all could/should be. Signed-off-by: Michel Pollet <buserror@gmail.com>
1. add sigma-delta code and example. 2. add gpio output signal in io matrix. Squashed commits: [a25e7d4] minor changes for doc [6a03a1e] minor changes on comments and doc. [97dd9e4] Add doc. update index.rst change example index