handsfree_ag

Overview

This example demonstrates the HFP Ag basic functionality, currently support simulate an incoming call, and the call could be answered and ended.

The HFP Ag can connected at most two HFP HF devices like headphone or device running HFP HF device. But the SCO audio can only be opened with one connection at the same time.

Prepare the Demo

  1. Open example’s project and build it.

  2. Connect a USB cable between the PC host and the OpenSDA USB port on the target board.

  3. Open a serial terminal on PC for OpenSDA serial device with these settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  4. Download the program to the target board.

  5. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.

Running the demo

The log below shows the output of the example in the terminal window.

USB Host stack successfully initialized
Bluetooth initialized

SHELL build: Mar  1 2021
Copyright  2020  NXP

>>

the bellow commands have been supported:

"bt": BT related function
  USAGE: bt [discover|connect|disconnect|delete]
    discover             start to find BT devices
    connect              connect to the device that is found, for example: bt connect n (from 1)
    select_conn <1|2>    select the connection to process
    openaudio            open audio connection without calls on the selected conn
    closeaudio           close audio connection without calls on the selected conn
    sincall              start an incoming call on the selected conn
    aincall              accept the call on the selected conn.
    eincall              end an call on the selected conn.
    set_tag              set phone num tag on the selected conn, for example: bt set_tag 123456789
    select_codec         codec select for codec Negotiation on the selected conn, for example: bt select_codec 2, it will select the codec 2 as codec.
    set_mic_volume       update mic Volume on the selected conn, for example: bt set_mic_volume 14
    set_speaker_volume   update Speaker Volume on the selected conn, for example: bt set_speaker_volume 14
    stwcincall           start multiple an incoming call on the selected conn
    disconnect <1|2>     disconnect current connection
    delete               delete all devices. Ensure to disconnect the HCI link connection with the peer
    set_hf_ind <1|2> <enable|disable>      enable/disable the hf indicator on the selected conn. 1 - enhanced driver safety; 2 - battery leveldevice before attempting to delete the bonding information.

  1. “discover” start to find BT devices, it will list all device can be found, usage

  2. “connect” is used to connect to the device that is found, this demo supports connecting max 2 hf devices. for example: bt connect n (from 1), usage: bt connect 1

  3. “select_conn” is used to select the connection that the other shell cmds operate.

  4. “openaudio” is used to open audio connection without calls, only one connection is supported at the same time.

  5. “closeaudio” is used to close audio connection without calls, only one connection is supported at the same time.

  6. “sincall” is used to start an incoming call, only one connection is supported at the same time.

  7. “aincall” is used to accept an incoming call, only one connection is supported at the same time.

  8. “eincall” is used to end or reject an incoming call, only one connection is supported at the same time.

  9. “set_tag” is used to set phone num tag, for example: bt set_tag 123456789

  10. “select_codec” is used to codec select for codec Negotiation, for example: bt select_codec 2, it will select the codec 2 as codec, usage: bt select_codec 2

  11. “set_mic_volume” is used to set mic volume, the value is from 1 to 15, usage as: bt set_mic_volume 8

  12. “set_speaker_volume” is used to set speaker volume, the value is from 1 to 15, usage as: bt set_speaker_volume 8

  13. “stwcincall” to start multiple an incoming call, need run “sincall” is used to start an incoming call before run the command

  14. “disconnect” to disconnect current connection

  15. “delete” is used to delete all devices. Ensure to disconnect the HCI link connection with the peer device before attempting to delete the bonding information.

  16. “set_hf_ind” is used to operate the hf indicator function.

Note:

  1. There is a short noise can be heard at headset at the begin audio streaming when in running HFP Ag .

  2. The codec power on pop noise cannot eliminate.

Supported Boards