topic Re: BLE stack fails when started from bootloader in MCUXpresso SDK

BLE stack fails when started from bootloader

arpad_toth — Tue, 02 Jul 2019 16:57:48 GMT

Hello,

My problem is that the BLE stack misbehaves when the application SW is started via a bootloader.

When there is no bootloader (application started directly) BLE works correctly.

The problem: BLE scanning (RX) reports in invalid (gapScannedDevice_t) length, advEventType and payload.
BLE advertisment (TX) works correctly even when started from bootloader.

Is there something RAM address dependent regarding Gap_StartScanning/gapScannedDevice_t parameter?
Bootloader should be transparent to application, so it considered as a clean start. (stack reset, bss cleared..)

Bootloader seems to be working correctly, also rest of the application too, only the BLE part fails.

Architecture:

Bootloader (no BLE stack) at flash address: 0x21000000
jump to app

vector_p = 0x21019000
SCB->VTOR = vector_p
__set_MSP(vector_p->stack_addr);
vector_p->resetFunc_p();

Application flash address: 0x21019000
lib_ble_5-0_host_cm4.a
lib_ble_QN908XC_controller.a
lib_crypto_m4.a

binary image shifted by 0x19000

Env:
MCU:QN9080x
MCUXpresso SDK v2.2.0

Thank you

Re: BLE stack fails when started from bootloader

stephanie_m — Wed, 03 Jul 2019 15:11:34 GMT

Hello,

You can check the bootloader example that we provide in for the OTA example as well as give a check to the BLE Application Developer's Guide.pdf for further details on this.

Hope that helps.

Regards,

Estephania

Re: BLE stack fails when started from bootloader

arpad_toth — Wed, 10 Jul 2019 10:13:35 GMT

Hello,

After a lot of debugging I figured out that calling CALIB_SystemCalib library function for the 2nd time reduces the BLE tag report count by 3. (from 30tag/sec to 10)

First it was called from bootloader, 2nd it was called from application. Digging deeper it is the CALIB_PowerOn(); part that causes this problem.

Reported tags are still valid, but less.

Looks like a library or HW bug.

Re: BLE stack fails when started from bootloader

stephanie_m — Wed, 10 Jul 2019 21:01:11 GMT

Hello,

It would appear that the issue it's in the bootloader as this does not seem to happen in the example applications, are you using your custom board?

Did you use the one I mentioned as a base?

Regards,
Estephania

Re: BLE stack fails when started from bootloader

arpad_toth — Thu, 11 Jul 2019 08:03:29 GMT

Sorry I forgot to mention I could reproduce the issue without a bootloader, so in the application I just called CALIB_SystemCalib twice, and the find rate went down by 3 times, and it is easy to reproduce.

We use custom board with 32Mhz crystal, but that shouldn't matter.

Re: BLE stack fails when started from bootloader

stephanie_m — Fri, 12 Jul 2019 16:00:04 GMT

Hello,

What do you mean that you are calling the CALIB_SystemCalib twice? Your board design can affect, is this reproducible in the development kit?

Regards,
Estephania

Re: BLE stack fails when started from bootloader

arpad_toth — Fri, 29 Nov 2019 15:20:42 GMT

Hello,

Is there a way to fully reset the BLE SW stack?

Looks like to retains some data even when jumping to main application (resetting stack, clearing static variables), BLE causing a lot of problem for us.

Doing this doesn't solve the problem:

void bleWrapper_deinit(void)
{
(void) Gap_StopScanning();
(void) Gap_StopAdvertising();
BLE_Init(gAppMaxConnections_c);
}