Bluetooth

This guide will show you how to connect to the phyCORE-i.MX8X development kit using the on-board Sterling-LWB WiFi/Bluetooth module.

Note

The Wifi/BT module can not be used at the same time as the SD card reader so the user must boot from eMMC.

Please refer to our eMMC guide for more information.

Requirements

Bluetooth capable device to test with

Setting Up Hardware

With the development kit powered off make sure the necessary switches are configured correctly.
1. Set S10 to the eMMC boot configuration. Refer to the Boot Switches configuration page for more information.
2. Set S7 to the ON position.
Power on the board and stop in U-Boot.

Make sure your environment variables are set correctly and boot into Linux.

Target (U-Boot)

setenv mmcdev 0
setenv mmcroot "/dev/mmcblk0p2 rootwait rw"
setenv overlay_files phytec-imx8qxp-bt.dtbo
boot

Connecting A Bluetooth Device

After logging into Linux, run the brcm_patchram_plus utility which may take a second or two. This utility patches the firmware to the radio.
Target (Linux)
```
brcm_patchram_plus --patchram /lib/firmware/brcm/BCM43430A1.hcd --enable_hci --no2bytes --tosleep 1000 /dev/ttyLP1 &
```

Expected Output

[   38.357433] Bluetooth: HCI UART driver ver 2.3
[   38.362003] Bluetooth: HCI UART protocol H4 registered
[   38.367189] Bluetooth: HCI UART protocol BCSP registered
[   38.372729] Bluetooth: HCI UART protocol LL registered
[   38.377926] Bluetooth: HCI UART protocol ATH3K registered
[   38.384044] Bluetooth: HCI UART protocol Broadcom registered
[   38.389865] Bluetooth: HCI UART protocol QCA registered
Done setting line discpline

Check that the bluetooth module was properly configured using the “hciconfig” command.

Target (Linux)

hciconfig

Expected Output

hci0:   Type: Primary  Bus: UART
        BD Address: 00:25:CA:35:52:0C  ACL MTU: 1021:8  SCO MTU: 64:1
        DOWN
        RX bytes:675 acl:0 sco:0 events:35 errors:0
        TX bytes:427 acl:0 sco:0 commands:35 errors:0

Bring the Bluetooth interface up.
Target (Linux)
```
rfkill unblock bluetooth
hciconfig hci0 up
```

Run “hcitool lescan” in Linux to scan for your external device.

Target (Linux)

 hcitool lescan

Expected Output

LE Scan ...
18:EE:69:04:69:72 (unknown)
0B:E4:8A:B0:80:78 (unknown)
11:4F:37:EB:2A:6C (unknown)
5A:B0:B7:F2:5B:27 (unknown)
31:BC:21:21:9C:5F Raycon E55 Earbuds
31:BC:21:21:9C:5F (unknown)
64:E7:A7:29:11:AA (unknown)
66:2C:40:EC:77:C9 (unknown)
7F:3B:C9:53:54:E4 (unknown)
7F:3B:C9:53:54:E4 (unknown)
41:CC:AD:C6:0F:C2 (unknown)
57:80:3F:07:D6:B7 (unknown)
64:E7:A7:29:11:AA (unknown)
2A:B2:24:F3:FB:EB (unknown)
18:EE:69:04:69:72 (unknown)