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Windows 7: Bluetooth dingle BT820 (csr8510a10) not working in Win7

17 Aug 2017   #1

Win7 Pro SP1 x64
Bluetooth dingle BT820 (csr8510a10) not working in Win7

Hi, this problem makes me nuts.
My HP 280 G1, x64, Win7 Pro SP1 has no built in BT, so I bought the BT820 from Laird and it is built on the csr8510a10 chipset. It is said to not require any additional driver, but uses the native in Win7.
Well, I connect it and yes, it installs. I Power my BT server using the Laird BT730 board (also csr8510a10 chipset).
When seraching for it, it is found, I connect and is asked for the pariring code which is entered. However, this procedure is unusually slow, each step takes abt 10 seconds! When code is entered, it start to install the server and finally reports that it has found the Serial Port and its user name correctly. It has then assigned the COM5 for me as an outgoing port to connect to the server in my app.
Yes, I open my app and selects the COM5. Nothing happens. After a while it times out and Connection is not established. Since I wrote the app myself I could debug it and see that it is the COMPort.Open() that is the offending statement.
Now, come the funny part. When I switch to BT400 from ASUS and a specially developed driver, then BINGO! All works Lightning fast. COM port is opened and I can talk to the BT server.

Asking around no one seems to know why the native MS BT driver will not work. BUT, BUT, it does work flawlessly in Win XP SP3.. How about that?

Now, how to solve this? To make the BT820 work with Win7?
Yes, I have the same problem with Android, variousp hones and PDAs. The won't open the COM-port.

Moreover, I installed the latest driver stack from CSR which totally ruined my computer. It prevented the ASUS BT400 from working, it could not be uninstalled properly, not even using a reset Point would work. I had to make use of the HDD backup I had taken Before this experiment. Warning for the CSR driver, then!

Solution anyone, since I'm stuck?
Thanks in advance.

My System SpecsSystem Spec
17 Aug 2017   #2

windows 7 32 64


IF UR PROBLEMS still exist (i presume ur problem will be solved) ... just POST ur problem here again. together we solves it one by one. adious smart!

PS: right click on DESKTOP , create SHORTCUT - services.msc. .. MAKE SURE it is on DEFAULT STATE!. another things u need to is PERFORM was, CLEANBOOT - go to MSCONFIG and disable its SERVICES, TICK (HIDE MICROSOFT SERVICES), and perfrom CLEANBOOT, and restart ur pc, AFTER THAT re-instate it ALL BACK AGAIN ( NORMAL MODE ) at MSCONFIG menu ...try and see whether it solves ur problems or not. GOODLUCK!

PS: go to MSCCOFNGI again, PLZ CHECK it whether its STAY AT [NORMAL MODE] and is THERE!, NOT on other selections options such as MINIMAL MODE or at BASIC MODE!. otherwise, U NEED TO DOWNLOAD another software like REFRESHPC or SERVICE DEFAULT tool and TRY IT!.
My System SpecsSystem Spec
18 Aug 2017   #3

Win7 Pro SP1 x64

Thanks for response!
I just wonder: I reinstalled Win7 from CD and then updated it with the remaining 167 critical updates.
Would that be enough as clearing out the system?
And, yes, the BT services is ON automatically at system start.
After this complete reset and without installing any external driver at all, I inserted the BT820 and
was stopped when trying to open the assigned COM port.
Does anyone know whta the difference is between the MS BT driver stack in WinXP SP3 and Win7 SP1?
Since it works in XP without any problems with all dongles and not in Win7, then logic dictates that the error must be in the Win7 BT driver stack?
If the setup visavi the BT730 works in XP then there could be nothing wrong there?
Thus there would be errors in the SPP handling in all modern OS... ?
I could sen you the setup code for the BT730 board (in C) but I wonder if that would help you.
The open statement in VB is too wellknow to elaborate on. The setup of the COM channel is this:

COMPort.PortName = COMPortsBox.SelectedItem
COMPort.BaudRate = 9600 ' Default for Max-i: 9600 bit/s, 8 data bits,
no parity, 1 stop bit
COMPort.WriteTimeout = 20000 ' Max time to waita for CTS = 20 sec.
COMPort.Handshake = Handshake.None
COMPort.DataBits = 8
COMPort.StopBits = StopBits.One
COMPort.Parity = Parity.None
COMPort.DtrEnable = False
COMPort.RtsEnable = False

Catch ex As Exception
MsgBox("cannot open Com Port " + COMPortsBox.SelectedItem + " " +
Convert.ToString(ex), 0)
End Try

These settings correspond to the setting in the Device parameters as reported by Windows.
Including an attachment showing the error reported by Windows at Open.

Attached Images
Bluetooth dingle BT820 (csr8510a10) not working in Win7-io-error.jpg 
My System SpecsSystem Spec


 Bluetooth dingle BT820 (csr8510a10) not working in Win7

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