Bluetooth
The phyBOARD-Lyra AM62x supports external Bluetooth modules via the M.2 connector located on the bottom of the development kit carrier board, at X36. For more information on the M.2 connector on the phyCORE-AM62x development kit, please see the Hardware Manual.
Requirements
RF Antenna, 2.4GHZ/5GHZ (2069940100) Option 1
M2 4MM Bolt (Optional)
Warning
Depending on the Bluetooth module you are using, the jumpers J19 and J20 may require adjustment to level shift the signals routed out of the M.2 connector.
The module requires a 1.8V operating voltage, thus this module specifically requires J19 and J20 set to the 1+2 jumper position. This is the default position on the kit. (reference development kit schematics for clarification).
J19 |
1+2 = 1.8V |
2+3 = 3.3V |
Level shifts UART (Bluetooth) and PCM (audio) signals |
|---|---|---|---|
J20 |
1+2 = 1.8V |
2+3 = 3.3V |
Level shifts MMC (WIFI) signals |
Hardware Setup
Power off the development kit and disconnect the power supply.
Prepare the M.2 Bluetooth module by securing the antenna.
Connect the M.2 Bluetooth module to the X36 M.2 connector on the bottom side of the carrier board. We recommend securing the module with a M2 bolt into the soldered standoff.
Enable the Bootloader Overlay
Power on the development kit and hit any key to stop in U-Boot.
sh-uboot:~# setenv overlays k3-am62-phyboard-lyra-m2-lwb5p.dtbo sh-uboot:~# boot
Note
For more information about overlays see the guide Configuring the Bootloader.
Verifying BT Connection
Once in Linux, verify that module is recognized by the development kit.
sh-phyboard-lyra-am62xx-3:~# hciconfig hci0: Type: Primary Bus: UART BD Address: <DEVICE MAC ADDR> ACL MTU: 1021:8 SCO MTU: 64:1 DOWN RX bytes:3137 acl:0 sco:0 events:307 errors:0 TX bytes:51394 acl:0 sco:0 commands:307 errors:0
Turn Bluetooth on.
sh-phyboard-lyra-am62xx-3:~# hciconfig hci0 up
Verify the module is now up.
sh-phyboard-lyra-am62xx-3:~# hciconfig hci0: Type: Primary Bus: UART BD Address: <DEVICE MAC ADDR> ACL MTU: 1021:8 SCO MTU: 64:1 UP RUNNING RX bytes:3137 acl:0 sco:0 events:307 errors:0 TX bytes:51394 acl:0 sco:0 commands:307 errors:0
Ping Test
This ping test requires an additional Bluetooth device that can be pinged. A cellphone searching to pair with a Bluetooth device would work.
With the Bluetooth interface up, scan the area for available Bluetooth devices.
sh-phyboard-lyra-am62xx-3:~# hcitool scan Scanning ... <DEVICE MAC ADDR> Pixel 4a <--DEVICE NAME
Ping the device.
sh-phyboard-lyra-am62xx-3:~# l2ping -i hci0 -c 10 <DEVICE MAC ADDR> Ping: <DEVICE MAC ADDR> from 00:25:CA:2F:EE:72 (data size 44) ... 0 bytes from <DEVICE MAC ADDR> id 0 time 13.78ms 0 bytes from <DEVICE MAC ADDR> id 1 time 101.05ms 0 bytes from <DEVICE MAC ADDR> id 2 time 111.12ms 0 bytes from <DEVICE MAC ADDR> id 3 time 118.60ms 0 bytes from <DEVICE MAC ADDR> id 4 time 97.36ms 0 bytes from <DEVICE MAC ADDR> id 5 time 113.59ms 0 bytes from <DEVICE MAC ADDR> id 6 time 94.90ms 0 bytes from <DEVICE MAC ADDR> id 7 time 111.10ms 0 bytes from <DEVICE MAC ADDR> id 8 time 128.61ms 0 bytes from <DEVICE MAC ADDR> id 9 time 108.60ms 10 sent, 10 received, 0% loss