AM62P: Support on bringing up HFP and Rfcomm SPP in Linux

Mohammed Shakir

Part Number: AM62P
Other Parts Discussed in Thread: CC3351,

Hi TI Team,

We are trying to bring up HFP profile and Rfcomm SPP communication support in the TI AM62P setup running Linux 11.02.08.02. We had purchased CC3351, but unfortunately, it supports only WiFi & BLE.

Now we are using USB Bluetooth Dongle from TP Link (UB500), and we are now able to use Bluetooth for scanning & pairing between Mobile Devices and the AM62P. Following are the changes which we had done to achieve the required behavior so far.

Added below entries to kernel config

CONFIG_BT=y
CONFIG_BT_BREDR=y
CONFIG_BT_RFCOMM=y
CONFIG_BT_RFCOMM_TTY=y
CONFIG_BT_L2CAP=y
CONFIG_BT_SCO=y
CONFIG_BT_LE=y

Verified the changes are reflected in the target

root@am62pxx-evm:~# zcat /proc/config.gz | grep RFCOM
CONFIG_BT_RFCOMM=y
CONFIG_BT_RFCOMM_TTY=y

Validated bluetoothctl

[bluetooth]# show
Controller 8C:90:2D:CB:AF:63 (public)
        Manufacturer: 0x005d (93)
        Version: 0x0a (10)
        Name: am62pxx-evm
        Alias: am62pxx-evm
        Class: 0x00000000 (0)
        Powered: yes
        Discoverable: no
        DiscoverableTimeout: 0x000000b4 (180)
        Pairable: yes
        UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
        UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
        UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
        UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
        UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
        Modalias: usb:v1D6Bp0246d0548
        Discovering: no
        Roles: central
        Roles: peripheral
Advertising Features:
        ActiveInstances: 0x00 (0)
        SupportedInstances: 0x04 (4)
        SupportedIncludes: tx-power
        SupportedIncludes: appearance
        SupportedIncludes: local-name
        SupportedSecondaryChannels: 1M
        SupportedSecondaryChannels: 2M
        SupportedSecondaryChannels: Coded

Even though all these confirmations are there, when tried doing rfcomm, we are getting below error.

root@am62pxx-evm:~# rfcomm 
Can't open RFCOMM control socket: Protocol not supported

# Bluetooth is not having RFCOMM entry
root@am62pxx-evm:~# cat /proc/net/protocols | grep bluetooth                                                                                                                                                       
SCO        856      0      -1   NI       0   no   bluetooth   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
L2CAP      840      0      -1   NI       0   no   bluetooth   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n
HCI        896      0      -1   NI       0   no   bluetooth   n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n  n

# Bluetooth is not having rfcomm entry
root@am62pxx-evm:~# lsmod | grep bluetooth
bluetooth             540672  26 btrtl,btmtk,btintel,btbcm,btusb
ecdh_generic           16384  2 bluetooth
rfkill                 28672  4 bluetooth,cfg80211

Please suggest how we can bring up rfcomm and hfp profile in the TI AM62P?

Thanks & Regards,
Mohammed Shakir

3 months ago