michael c82e51cf79 fix(intr): always assign the same intr to a same source, disable the source only when all the handlers disabled.
also document handlers sharing a same source.

TW#13454, https://github.com/nodemcu/nodemcu-firmware/issues/1874

Breaking change: handles assigned to a same source should have the same flag now.
2017-09-06 15:20:01 +08:00
..
2016-12-19 14:23:39 +08:00
2017-04-11 15:45:54 +08:00