How to setup Marvell bluetooth

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How to setup Marvell bluetooth

Overview of How-To

This How-To is meant to be a starting point for people to learn how to setup the bluetooth on IGEP Technology devices as quickly and easily as possible.

Feedback and Contributing

At any point, if you see a mistake you can contribute to this How-To.

Setup basics

Bluetooth Classes (information)

Some IGEP Technology boards has built-in a Class 2 Bluetooth 2.0 + EDR device.

Class Maximum Permitted Power
mW (dBm) 		Range
(approximate)
Class 1 100 mW (20 dBm) ~100 meters
Class 2 2.5 mW (4 dBm) ~10 meters
Class 3 1 mW (0 dBm) ~1 meter

Setup bluetooth internal parameters

By default the WIFI-BT module is not configured for single antenna, so you need to configure this, set registers settings as follows:

Register offset Register Name 8686 Bx
0x8000_A58C BT Switch Control 0x40865
0x8000_A5A0 3/4W BCA mode config 0xD24D
0x8000_A5F0 BCA WLAN modes 0xA027181C

You need to be root to do this - sudo won't do! 

mount -t debugfs none /sys/kernel/debug

echo "0xa58c 0x40865" > /sys/kernel/debug/lbs_wireless/wlan0/registers/wrmac 
echo "0xa5a0 0xd24d" > /sys/kernel/debug/lbs_wireless/wlan0/registers/wrmac 
echo "0xa5f0 0xa027181c" > /sys/kernel/debug/lbs_wireless/wlan0/registers/wrmac

Validate serial comunication to CSR bluetooth xip

Configure ttyO1 

stty -F /dev/ttyO1 ispeed 115200 ospeed 115200 cs8 -cstopb clocal -crtscts -parodd

To read CSR chip version 

bccmd -t bcsp -d /dev/ttyO1 chiprev
Chip revision: 0x0030 (BC4-ROM)


Load PSKEY parameters

With your preferred editor create a 'bluez.psr' file like this: 

// PSKEY Parameters for Bluetooth RF
// (1) 0x0031 (PSKEY_LC_ENHANCED_POWER_TABLE)
&0031 = 0900 0000 3f00 4700 ec00 0f00 0000 3f00 4a00 f000 1600 0000 3f00 4d00 f400 1e00 0000 \
3f00 5000 f800 2600 0000 3f00 5500 fc00 2e00 0000 3f00 5b00 0000 3800 0000 3f00 6900 0400
// (2) 0x01f6 (PSKEY_ANA_FTRIM)
&01f6 = 001d
// (3) 0x01fe (PSKEY_ANA_FREQ)
&01fe = 6590    // 26MHz reference clock
// (4) 0x01be (PSKEY_UART_BAUDRATE)
&01be = 0x1d8  // 115200
// (5) 0x0028 (PSKEY_LC_COMBO_DISABLE_PIO_MASK)
&0028 = 0200 0000 0000
// (6) 0x002a (PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE)
&002a = 0011

And send the file using the bccmd tool. 

bccmd -t bcsp -d /dev/ttyO1 psload -r bluez.psr

Loading PSKEY_LC_ENHANCED_POWER_TABLE ... done
Loading PSKEY_ANA_FTRIM ... done
Loading PSKEY_ANA_FREQ ... done
Loading PSKEY_UART_BAUDRATE...done
Loading PSKEY_LC_COMBO_DISABLE_PIO_MASK ... done
Loading PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE ... done

Setup HCI device

Load Linux kernel modules

Next, you will need to load some bluetooth modules. Prompt: 

modprobe bluetooth
modprobe hci_uart
modprobe hidp
modprobe l2cap
modprobe rfcomm

You shoud get these logs ( using IGEP Firmware Yocto 1.2.2-3 ): 

root@igep00x0:~# modprobe bluetooth
[ 1183.967773] Bluetooth: Core ver 2.15
[ 1183.971588] NET: Registered protocol family 31
[ 1183.976226] Bluetooth: HCI device and connection manager initialized
[ 1183.982849] Bluetooth: HCI socket layer initialized
root@igep00x0:~# modprobe hci_uart
[ 1184.013031] Bluetooth: HCI UART driver ver 2.2
[ 1184.017669] Bluetooth: HCI H4 protocol initialized
[ 1184.022674] Bluetooth: HCI BCSP protocol initialized
[ 1184.027832] Bluetooth: HCILL protocol initialized
root@igep00x0:~# modprobe hidp
[ 1184.067993] Bluetooth: L2CAP ver 2.15
[ 1184.071807] Bluetooth: L2CAP socket layer initialized
[ 1184.087188] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
root@igep00x0:~# modprobe l2cap
root@igep00x0:~# modprobe rfcomm
[ 1184.147399] Bluetooth: RFCOMM TTY layer initialized
[ 1184.152526] Bluetooth: RFCOMM socket layer initialized
[ 1184.157867] Bluetooth: RFCOMM ver 1.11

Create HCI device

Finally you can attach to device an scan for other bluetooth devices. 

hciattach -s 115200 /dev/ttyO1 bcsp 115200 noflow
hciconfig hci0 up
hciconfig hci0 piscan
hciconfig -a hci0
hci0:	Type: UART
	BD Address: 00:02:5B:00:A5:A5 ACL MTU: 310:10 SCO MTU: 64:8
	UP RUNNING PSCAN ISCAN 
	RX bytes:1376 acl:0 sco:0 events:25 errors:0
	TX bytes:740 acl:0 sco:0 commands:24 errors:0
	Features: 0xff 0xff 0x8f 0xfe 0x9b 0xf9 0x00 0x80
	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
	Link policy: RSWITCH HOLD SNIFF PARK 
	Link mode: SLAVE ACCEPT 
	Name: 'igep0020b (0)'
	Class: 0x120112
	Service Classes: Networking, Object Transfer
	Device Class: Computer, Handheld
	HCI Ver: 2.0 (0x3) HCI Rev: 0xc5c LMP Ver: 2.0 (0x3) LMP Subver: 0xc5c
	Manufacturer: Cambridge Silicon Radio (10)

Scan for HCI bluetooth peer devices

hcitool -i hci0 scan
Scanning ...
        00:1E:A4:FC:EC:2E       Phone

Ping bluetooth peer device

root@igep00x0:/etc/bluetooth# l2ping -c 4  00:1E:A4:FC:EC:2E
Ping: 00:1E:A4:FC:EC:2E from 00:02:5B:00:A5:A5 (data size 44) ...
44 bytes from 00:1E:A4:FC:EC:2E id 0 time 38.79ms
44 bytes from 00:1E:A4:FC:EC:2E id 1 time 38.60ms
44 bytes from 00:1E:A4:FC:EC:2E id 2 time 38.66ms
44 bytes from 00:1E:A4:FC:EC:2E id 3 time 538.79ms
4 sent, 4 received, 0% loss

Others

Switch-off wifi to get better bluetooth performance

For best performance you need to disable WIFI, you can do this:

Disable wlan0 interface 

ifconfig wlan0 down

Switch-off "power down" line of wifi

  • For IGEPv2 RevC (IGEP0020-RC) and IGEP COM MODULE (IGEP0030-RE) series 
echo 0 > /sys/class/gpio/gpio138/value
  • For older IGEPv2 RevB (IGEP0020-RB) series 
echo 0 > /sys/class/gpio/gpio94/value

Ensure uart2 gpio/mux configuration

In IGEPv2 you should configure uart2_XXX pins like: 

root@igep00x0:~# mount -t debugfs none /sys/kernel/debug

root@igep00x0:~# cat /sys/kernel/debug/omap_mux/uart2_*
name: uart2_cts.uart2_cts (0x48002174/0x144 = 0x0118), b ab26, t NA
mode: OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0
signals: uart2_cts | mcbsp3_dx | gpt9_pwm_evt | NA | gpio_144 | NA | NA | safe_mode

name: uart2_rts.uart2_rts (0x48002176/0x146 = 0x0000), b ab25, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE0
signals: uart2_rts | mcbsp3_dr | gpt10_pwm_evt | NA | gpio_145 | NA | NA | safe_mode

name: uart2_rx.uart2_rx (0x4800217a/0x14a = 0x0100), b ad25, t NA
mode: OMAP_PIN_INPUT | OMAP_MUX_MODE0
signals: uart2_rx | mcbsp3_fsx | gpt8_pwm_evt | NA | gpio_147 | NA | NA | safe_mode

name: uart2_tx.uart2_tx (0x48002178/0x148 = 0x0000), b aa25, t NA
mode: OMAP_PIN_OUTPUT | OMAP_MUX_MODE0
signals: uart2_tx | mcbsp3_clkx | gpt11_pwm_evt | NA | gpio_146 | NA | NA | safe_mode

External References

BlueZ (Official Linux Bluetooth protocol stack)
BlueZ user howto - 6.0 Get your bluetooth device up!

See also

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