This breaks the 3.5mm audio male to female micrphone and headphon. The definition of the audio male is CTIA, which is what apple using.
It turns out that the audio jack of pcDuino3 follows OMTP standard, while Apple follows CTIA/AHJ standard. The definitions of the two different standards are reproduced here (The original can be found at here):
|Standard||Tip||Ring 1||Ring 2||Sleeve||Phones using this Standard|
|OMTP||Left Audio||Right Audio||Microphone||Ground||old Nokia (and also Lumia starting from the 2nd gen), old Samsung (2012Chromebooks), old Sony Ericsson (2010 and 2011 Xperias), old Wiko (2012-), PlayStation Vita and DualShock 4 PS4 controller|
|CTIA/AHJ||Left Audio||Right Audio||Ground||Microphone||Apple, HTC, latest Nokia, latest Samsung, latest Sony (2012+), latest Wiko (2013+), Jolla, most Android phones|
If you want to use it with pcDuino3 or other phones, please use a converter.