Linux/DRA744: Bluetooth bringup on dra74xx interfacing with wl1837

lal bosco lawrence

Part Number: DRA744
Other Parts Discussed in Thread: WL1837,

Tool/software: Linux

Hi,

I am able to bring up WiFi on dra744 interfacing with wl1837 (NF3108).

I am using processor SDK.

For Bluetooth, I did following changes,

1. On dts file (configure the UART3 and BT_EN pin)
---------------------------------------------------
&uart3 {
   pinctrl-names = "default";
   pinctrl-0 = <
       0x248   (PIN_INPUT | MUX_MODE0) /* uart3_Rx */
       0x24c   (PIN_OUTPUT | MUX_MODE0) /* uart3_Tx */
       0x338   (PIN_INPUT | MUX_MODE1) /* uart3_CTS */
       0x3cc   (PIN_OUTPUT | MUX_MODE1) /* uart3_RTS */
   >;
   status = "okay";
   fsl,uart-has-rtscts;

   gpio = <&gpio5 4 0>;   /* BT Enable : BT_EN */
   startup-delay-us = <70000>;
   enable-active-high;
};

2. After boot up, run the following script to create a port :
---------------------------------------------------------------------------
   echo <bt_en> /sys/class/gpio/export
   echo out > /sys/class/gpio/gpio<bt_en>/direction
   echo 0 > /sys/class/gpio/gpio<bt_en>/value
   echo 1 > /sys/class/gpio/gpio<bt_en>/value
   gpio="nshutdown_gpio=16"
   tty="tty=/dev/ttyS2"
   flow="flow_cntrl=1"
   baud_rate="baud_rate=3000000"
   mkdir /home/root/tibt
   echo $gpio > /home/root/tibt/config
   echo $tty >> /home/root/tibt/config
   echo $flow >> /home/root/tibt/config
   echo $baud_rate >> /home/root/tibt/config

3. Attach the ttyS2
---------------------
   hciattach /dev/ttyS2 any 3000000

   got the following logs,
   [ 197.406076] Bluetooth: HCI UART driver ver 2.3
   [ 197.410722] Bluetooth: HCI UART protocol H4 registered
   [ 197.416376] Bluetooth: HCI UART protocol BCSP registered
   [ 197.421791] Bluetooth: HCI UART protocol LL registered
   [ 197.427077] Bluetooth: HCI UART protocol Three-wire (H5) registered
   [ 197.555125] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
   [ 197.560650] Bluetooth: BNEP filters: protocol multicast
   [ 197.566320] Bluetooth: BNEP socket layer initialized
   [ 199.463449] Bluetooth: hci0 command 0x1003 tx timeout
   [ 201.463452] Bluetooth: hci0 command 0x1001 tx timeout
   [ 203.463447] Bluetooth: hci0 command 0x1009 tx timeout

   root@dra7xx-evm:~/uart# hciconfig -a
   hci0:   Type: BR/EDR Bus: UART
       BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
       DOWN
       RX bytes:0 acl:0 sco:0 events:0 errors:0
       TX bytes:12 acl:0 sco:0 commands:3 errors:0

When i run the following command getting error,

root@dra7xx-evm:~/uart# hcitool scan
Device is not available: No such device
root@dra7xx-evm:~/uart# hcitool lescan
Set scan parameters failed: File descriptor in bad state

I have checked the BT_EN pin with scope and its got getting enabled.
I have enabled BT_EN pin manually.

Please help us with where I did wrong.

Thanks,
Lal

over 7 years ago

0 Hari Nagalla over 7 years ago

TI__Mastermind 27080 points

You, may check couple of things -
a) With, hciattach you need to specify the controller type.
hciattach /dev/ttyS2 texas 3000000

b) Ensure that the tty number and GPIO is matching with the UART port and GPIO wired to the WL18xx BT port.

Thanks

0 lal bosco lawrence over 7 years ago in reply to Hari Nagalla

Intellectual 370 points

Hi,

Thanks for the reply,

a)hciattach /dev/ttyS2 texas 3000000

Return timeout error.

b) I have re-checked the tty number.

I struck here,. I did pin-mux changes in dts file for uart3 along with bt_en pin (mentioned the dts file changes above).

After boot up, BT_EN pin is not configured, validated by reading the bt_en pin registers.

Please help me and guide me to configure the tty port (bt_en and Uart3 pins).

Thanks,

Lal

0 lal bosco lawrence over 7 years ago in reply to lal bosco lawrence

Intellectual 370 points

HI,

I did following experiment ,

1.Attach serial port for texas
		root@dra7xx-evm:~# hciattach /dev/ttyS2 texas 115200
		Wanted to write 4 bytes, could only write 0. Stop
		Can't initialize device: Success

	2.UART3 Register values
		root@dra7xx-evm:~# ./omapconf read 0x48020018  //UART_MDR1
		00000030
		root@dra7xx-evm:~# ./omapconf read 0x48020010  //UART_MSR
		00000003
		root@dra7xx-evm:~# ./omapconf read 0x48020000  //UART_DLL
		0000001D
		root@dra7xx-evm:~# ./omapconf read 0x48020004  //UART_DLH
		0000000D
		root@dra7xx-evm:~# ./omapconf read 0x4802000C  //UART_LCR
		00000013
	3.Following fuction and files are get called
		hci_uart_tty_ioctl() : drivers/bluetooth/hci_ldisc.c
		hci_uart_tty_write() : drivers/bluetooth/hci_ldisc.c
	4.Scan function
		root@dra7xx-evm:~# hcitool scan
		Device is not available: No such device
UART3 registers are getting configured, But I am unable to scan the BT devices.

I dont have any clue, how to proceed further.
Please guide us.

Thanks,
Lal Bosco

0 Hari Nagalla over 7 years ago in reply to lal bosco lawrence

TI__Mastermind 27080 points

Hi Lal,

Since, you seem to have basic UART connection issue with the device, i would suggest probing the UART lines between the host and the controller. You may use a scope. Initially it starts with 115200 baud to read controller type and version to download the firmware..
You can also connecting BT logger to BT_UART_DBG pin..
Please, check below -
www.ti.com/.../swru437.pdf
www.ti.com/.../WILINK-BT_WIFI-WIRELESS_TOOLS

Thanks

0 lal bosco lawrence over 7 years ago in reply to Hari Nagalla

Intellectual 370 points

Hi,
Thanks for your reply.
I have checked the UART pins with Oscilloscope and it not probing.
and I found that there is a problem with UART pin-mux.
I am continue to debug that issue and Thanks for your help.

Thanks,
lal Bosco

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Linux/DRA744: Bluetooth bringup on dra74xx interfacing with wl1837