Tuesday, September 27, 2011

One board... several firmwares

Hi !

The first time I bought some UART bluetooth devices, I ordered them on suntekstore.com website. Since these devices seems promising, i ordered a few more on DealExtreme for my job.

I discovered that even these boards seem identical, they had different firmwares.

The suntekstore ones has HC05 firmware, the DealExtreme ones has linvor 1.5 firmware.

The differences between them is mainly the AT command set.

Linvor 1.5 also known as HC06
This firmware offers a very limited set of AT command.
By default the baudrate is 9600 8N1.

For this firmware you have to not send LF or CR character at the end of your AT command.AT programming mode is up when your board is not paired by bluetooth devices. For this firmware, you have to copy/paste AT command since timings is important. You can send about one command per second.


Command
Response
Note
AT
OK
Usefull to check connection and   baudrate
AT+VERSION
Linvor1.5
Get the version of the module
AT+BAUDx
OKyyyy
Set the baudrate :
x can take the following values :
  • 1 for 1200 bps 
  • 2     2400 bps
  • 3     4800 bps 
  • 4     9600 bps 
  • 5    19200 bps 
  • 6    38400 bps 
  • 7    57600 bps 
  • 8   115200 bps 
  • 9   230400 bps 
  • A   460800 bps 
  • B   921600 bps 
  • C  1382400 bps
AT+NAMEString
OKsetname
Change bluetooth device name :
String can be any string you want ! be creative !! (20 characters limited)
AT+PINxxxx
OKsetpin
Set the bluetooth pincode :
1234 by default


And that's it !!! No other AT command.

In the next, post I will provide some links to the HC05 firmware. This one is a bit better than HC06.
Posted by at 8:50 AM
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12 comments:

  1. In dealextreme module the Pin 24 is for connection led.

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  2. thank you i will test and update

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  3. You can also set the parity with:
    AT+PN -> None
    AT+PE -> Even
    AT+PO -> Odd

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  4. Thanks a lot for the info. I order a few of these modules and to my surprise, they are HC-06. I have a few questions, they may be trivial, but I'm am a novice in electronics:
    1. How important is the value of the resistors? I mean, it seems to be a voltage divider, can you provide some info on Vin/Vout? I don't think I have these resistor values around and I would like to get started on this.
    2. Will the activity led remain at pin 24? I saw some diagrams for HC-05 where the led was connected to another pin, but I guess this change is done in firmware since this are programmable I/O pins

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  5. 1. http://www.magic-worlld.narod.ru/ try to calculate good values. vin 5 and vout 3.3

    2. led connection its done by firmware so hc05 diagrams show right pin for led

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  6. http://microsin.ru/content/view/1284/44/
    INFOS for and Pictures for the
    BlueFlashCmd Tools.
    Gruss Holger.

    ReplyDelete

  7. If the voltage divider is for vin 5v and vout 3.3v then a Schottky/3.3v pullup divider should also work, correct?
    Thanks

    ReplyDelete

  9. Hi Byron, first I'd like to thank you for all information about BT modules you have provided here and on DX website. I bought several modules on DX with linvor 1.5 fw. Unfortunately these modules work bit strange. Once everything works fine another time there are some interuptions in communication or it's not possible to establish connection. From this reason I'd like to update these modules to HC05 fw. I've downloaded original fw acording to your describtion. It wasn't possible to open LPT port, so I re-installled drivers ...//driver/win32/*.bat restarted PC, after restart it work fine(WXP, LPT1 EPP mode). In the next step I need to dump configuration constants related to concrete module, but I didn't catch how to proceed from your describtion of PSKEY command. Please,could you describe it more in detail? Will you post step by step instructions how to flash linvor to hc05 fw? thx JAN

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  10. In fact you only have to keep your Bluetooth identifier. You can make this by script with pscli command or via the pskey tool provide by CSR

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  11. Hi,
    Can be used as a bridge between bluetooth and RS232 ?
    My model is Linvor (EGBT-046S) from DX.

    Thank You,
    Best regards,

    Csaba Aranyi

    ReplyDelete

  12. Hi Byron,
    how do You set command mode?

    I have 2 types of BT modules, for BTM0604 http://www.oemblue.com/BTM06%20class2%20standard.html there is software to set UART mode parameters and Manual with AT cmds, for the second one A18 http://www.ktlink.cn/en/product2show.asp?id=6 only pin placement, both use CSR BC417 (does the same chip on Your modules?)

    The first already works as BT-RS232 bridge; to set it in cmd mode one must connect Vcc to PIO6/WLAN_Active/Ch_Data pin. Is it so in Your modules?

    Vadim

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