Bluetooth stack android serial#
Bluetooth stack android Bluetooth#

currently there are several manufacturers of these chips but they are mostly all Broadcom based ic's packaged in a dual, or triple radio package that contains a wifi, Bluetooth 4.0 Smart, and Bluetooth 4.0 radio.

Bluetooth stack android serial#

the HAL doesn't really do anything, it assembles the complex data messages that get sent along a tty serial (either spi, or UART) to an inter-network connected chip on the PCBA via the methods used in the HCI layer, which can be found in the 'BTE' layer in /external/bluetooth/bluedroid/ directory of an android compiling trunk from AOSP 4.2.2 to current. Each of these services also reference SMP and ATT files for controlling the actual Bluetooth server or client databases, and there security.

HAL, is the hardware abstraction layer that implements the actual Bluetooth state machines in c/cpp code, as such it controls the various state machines for A2dp, HFP, GATT, SPP, AVRCP, etc. So the above answer isn't totally correct. Ps, I'm still fairly new with Android app development, so I may have misused some of the terminologies and I apologies in-advance for that. I've looked through the devices file via Android-studio's DDMS-File Explorer. Actually, I don't even know if I'm looking into the right folder. Receive audio via Bluetooth in Android, yet I can't seem to find the appropriate file to modify. I've tried following the answer to this question: It would be nice if someone with an answer is able to break-down the steps to achieve this. What I don't understand is how does one access and modify the bluetooth stack. After much research I found that stock Android doesn't support A2dp (sink), and it's possible to modify Android's bluetooth stack to enable A2dp (sink). However, I'm now trying to change the bluetooth profile to A2dp, since there are two mic inputs (L/R) and WT32 supports A2dp (source). The bluetooth mic is implemented with Bluegiga's WT32 bluetooth module + a mic input, audio quality via HFP isn't great but it's sufficient for now. It's currently implemented on HFP and everything is working fine. I'm working on an audio recorder app that uses a bluetooth mic to record audio on to an Android device (Nexus 7 - rooted Android 4.4.2).