Wireless MCU中的主题 Re: KW40Z runtime change Bluetooth MAC address gBDAddress_c

KW40Z runtime change Bluetooth MAC address gBDAddress_c

lucianfiran — Fri, 24 Feb 2017 11:13:01 GMT

IAR 7.50; KW40Z_Connectivity_Software_1.0.1 (KSDK_1.3.0)

As the Bluetooth stack comes pre-compiled a variable interface is gBDAddress_c.

How to change at runtime this address ?

KW40Z_Connectivity_Software_1.0.1\ConnSw\examples\bluetooth\common\ble_controller_task.c

/* Public Device Address */
const uint8_t gBDAddress_c[6] = {BD_ADDR};

app_preinclude.h

#define BD_ADDR 0x13,0x00,0x00,0x9F,0x04,0x00

I find it easy to change the definition by removing the const part, is it ok ?

Other ways that I can think of is some volatile keyword added ?

What is the solution as this definition may have an external counterpart linked in host stack.

Re: KW40Z runtime change Bluetooth MAC address gBDAddress_c

lucianfiran — Mon, 27 Feb 2017 12:41:34 GMT

This variable is most likely exported in the host stack ble_controller_lib.a

Changing is type can lead to unwanted unpredictable behaviour ?

Re: KW40Z runtime change Bluetooth MAC address gBDAddress_c

jorge_a_vazquez — Sat, 11 Mar 2017 00:58:51 GMT

Hi Lucian

You can change it if you remove the const type qualifier, but the BD address is used when scanning/advertising, initiating connections, when performing the BLE pairing using SMP, the BDADDR is used internally to confirm identity, etc. So it must not be changed in runtime this BD_ADDRS. Normally in a use case, in your application you set the BD_ADDRS, and you keep that address for the all the BLE application. Note: if you reset the device and this address is random generated, it remain the same logic, you only set it once and it doesn't change.

Hope this information helps you
Have a great day,
Jorge Alcala

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Re: KW40Z runtime change Bluetooth MAC address gBDAddress_c

lucianfiran — Sat, 11 Mar 2017 07:35:28 GMT

So I can change the BLE MAC address inside hardware_init ?

ApplMain.c

....
void main_task(uint32_t param)
{
   ....
   hardware_init();
   ....
        /* Initialize peripheral drivers specific to the application */
        BleApp_Init();

        /* BLE Radio Init */
        XcvrInit(BLE);
...

Re: KW40Z runtime change Bluetooth MAC address gBDAddress_c

jorge_a_vazquez — Mon, 13 Mar 2017 21:41:42 GMT

Hi Lucian

Yes, before any connection and it shouldn't change. Or you could change it in the macro define #define BD_ADDR

Hope this information helps you
Have a great day,
Jorge Alcala