[Bluez-users] mx27, csr and bluez: initialisation timed out

[Bluez-users] mx27, csr and bluez: initialisation timed out

[Peter Wurmsdobler]

Hello,

I am using a combined WiFi/BlueTooth module called apm6628, integrating
  the CSR BlueTooth silicon which is connected over a serial cable to my
i.MX27 ADS development board, running linux 2.6.19.2. I have bluez
support compiled into the kernel and the bluez-utils installed using
LTIB (not to forget with the --enable-bccmd in the spec file).

The kernel boots, and the bluetooth related facilities printk some
messages such as HCI UART driver ver 2.2, H4 and BCSP protocol
initialised. Since the BlueTooth module does not know the clock
frequency it is using, or the baud rate of the host, I need to
"configure" the BlueCore and warm-reset it:

     mx27# bccmd -t BCSP -d /dev/ttymxc1 psload config.psr warmreset

However, the only message I get is: "Initialization timed out", which,
looking through the code, is generated in bluez/tools/csr_bcsp.c in the
open function. But why?

I then tried to compile bluez-utils on my linux host. For some reason, 
".configure --enable-bccmd" does not generate the bccmd options in the 
tools/Makefile. Any idea why that is so?

Alternatively to bccmd, could I simply use

     "hciattach -s 230400 -d /dev/ttymxc1 csr"

in order to create a hci0 device?

Am I missing something in the way the kernel creates bluetooth devices?

Is there a good (up-to-date) documentation on this matter?

Regards,
peter



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Re: [Bluez-users] mx27, csr and bluez: initialisation timed out

[Tim Chick]

>  [Bluez-users] mx27, csr and bluez: initialisation timed out
> From: Peter Wurmsdobler <peter@wu...> - 2008-01-22 13:46
>
> The kernel boots, and the bluetooth related facilities printk some
> messages such as HCI UART driver ver 2.2, H4 and BCSP protocol
> initialised. Since the BlueTooth module does not know the clock
> frequency it is using, or the baud rate of the host, I need to
> "configure" the BlueCore and warm-reset it:
>
> mx27# bccmd -t BCSP -d /dev/ttymxc1 psload config.psr warmreset
>

What you actually want is:

bccmd -t BCSP -d /dev/ttymxc1 psload -r config.psr

as bccmd can only perform one command at a time.

> However, the only message I get is: "Initialization timed out",
> which, looking through the code, is generated in
> bluez/tools/csr_bcsp.c in the open function. But why?
>

There appear to be some races in the BCSP, which may not cause a problem 
on a PC. I have some changes and will publish to the devel list.

As a work around, the following works reliably for me:

hciattach /dev/ttyS0 bcsp
bccmd -t HCI psload -r my.psr
killall hciattach
hciattach /dev/ttyS0 bcsp

Cheers,
Tim


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Re: [Bluez-users] mx27, csr and bluez: initialisation timed out

[Peter Wurmsdobler]

Thanks for the hints.
> hciattach /dev/ttyS0 bcsp
> bccmd -t HCI psload -r my.psr
> killall hciattach
> hciattach /dev/ttyS0 bcsp
hciattach, most of the time, does not work:

	peter@linuxpc:> hciattach /dev/ttyS0 bcsp
	Initialization timed out

On one occasion, which I cannot reproduce, hciattach actually worked to 
some extent:

	peter@linuxpc:> hciattach /dev/ttyS0 bcsp
	peter@linuxpc:> hciconfig
	hci0:   Type: UART
	        BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
	        DOWN
	        RX bytes:15 acl:0 sco:0 events:0 errors:0
	        TX bytes:8 acl:0 sco:0 commands:0 errors:0

Any subsequent call to download the psr file failed:

	peter@linuxpc:> bccmd -t hci psload my.psr
	Device not available
	peter@linuxpc:> bccmd -t hci -d /dev/ttyS0 psload my.psr
	Device not available

I also tried to connect from a Windows PC using BTcli:

	btcli (built Jan 17 2007, 15:35:14)
	Version 1.24
	BSCP on COM1 at 38400 bps
	rba
	command_complete nhcp:0x01 read_bd_addr success ba 0x00025b00a5a5

Why is it impossible for the Linux host to communicate with the BC4-ROM? 
What do I miss?

Thanks for any hints,
peter




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Re: [Bluez-users] mx27, csr and bluez: initialisation timed out

[Peter Wurmsdobler]

Hello,

> hciattach /dev/ttyS0 bcsp
> bccmd -t HCI psload -r my.psr
> killall hciattach
> hciattach /dev/ttyS0 bcsp

When the BC4-ROM is powered up, it does not know the values for certain 
keys, such as:

	PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE
	PSKEY_UART_BAUDRATE
	PSKEY_ANA_FREQ

So I connected the apm module (with the BC4-ROM in it) to the WindowsXP 
host, powered it up, then used the PStool to convince myself that this 
is true. Indeed it is.

Then I downloaded a socalled psr file containing these keys, and indeed, 
the values for these keys were differend. So the download must have worked.

Having power cycled the module, I tried once more on Linux:

peter@linuxpc:~$ hciattach /dev/ttyS0 bcsp
peter@linuxpc:~$ hciconfig
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:1058 acl:0 sco:0 events:22 errors:0
         TX bytes:684 acl:0 sco:0 commands:21 errors:0

peter@linuxpc:~$ bccmd -t HCI psload -r apm6628BT-UART.psr
Loading PSKEY_LC_COMBO_DISABLE_PIO_MASK ... failed
Loading PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE ... failed
Loading PSKEY_LC_ENHANCED_POWER_TABLE ... failed
Loading PSKEY_UART_BAUDRATE ... failed
Loading PSKEY_HOST_INTERFACE ... failed
Loading PSKEY_ANA_FREQ ... failed
Loading PSKEY_USE_EXTERNAL_CLOCK ... failed
Loading PSKEY_CLOCK_REQUEST_ENABLE ... failed
Loading PSKEY_CLOCK_REQUEST_FEATURES ... failed
peter@linuxpc:~$ bccmd -t bcsp psload -r apm6628BT-UART.psr
Initialization timed out

Apparently, on linux I cannot establish a reliable connection and 
download the settings.

Any ideas?
peter

--
apm6628BT-UNIF.psr:

// PSKEY_LC_COMBO_DISABLE_PIO_MASK
&0028 = 0200
// PSKEY_LC_COMBO_DOT11_CHANNEL_PIO_BASE
&002a = 0011
// PSKEY_LC_ENHANCED_POWER_TABLE
&0031 = 0400 0000 3f00 4500 e800 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 5000 0000 3f00 6900 0400
// PSKEY_UART_BAUDRATE
&01be = 01d8// 115.2 kbaud
// PSKEY_HOST_INTERFACE
&01f9 = 0001// BCSP link
// PSKEY_ANA_FREQ
&01fe = 4e20
//PSKEY_USE_EXTERNAL_CLOCK
&023b = 0001//true
//PSKEY_CLOCK_REQUEST_ENABLE
&0246 = 0003
// PSKEY_CLOCK_REQUEST_FEATURES
&03b6 = 0000


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