but playing sound is different from controlling a device right? or they just send data bytes which are control signals for the external device :) (instead of sending pcm data)
Cheers, Earlence On Mar 1, 12:38 pm, Stefan Schake <caytc...@gmail.com> wrote: > Hey, > > because user space apps are allowed to play sound? You certainly don't > get a perfect digital signal but its apparently good enough. > > Greetings > > 2011/2/28 Earlence <earlencefe...@gmail.com>: > > > Hi, > > > I have seen from this app (http://www.squareup.com) that they are > > driving an external device thru the headset jack with just a userspace > > app. > > I have checked the kernel sources and seen htc_35mm_headset.c and > > htc_headset.c which contains driver code for the HTC 2 Wire protocol. > > Its my understanding that to drive a custom device, a custom driver > > would be needed. and to replace a driver, root access is required. How > > is that app then able to drive a device on the headset jack from java > > userspace? > > > Cheers, > > Earlence > > > -- > > unsubscribe: android-kernel+unsubscr...@googlegroups.com > > website:http://groups.google.com/group/android-kernel -- unsubscribe: android-kernel+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-kernel
