Add Ble Scan to usbd_ble_uart_freertos example

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Sun, 13 Jun 2021 11:59:03 GMT

Hi Einar,

Thanks for solving the issue!!

RE: Add Ble Scan to usbd_ble_uart_freertos example

Einar Thorsrud — Thu, 10 Jun 2021 09:34:06 GMT

Hi,

The problem here is that there is a stack overflow in the BLE task (SoftDevice handler implemented in <SDK>\components\softdevice\common\nrf_sdh_freertos.c). You can see that by setting configCHECK_FOR_STACK_OVERFLOW to 2 in FreeRTOSConfig.h and a breakpoint in vApplicationStackOverflowHook() in your main.c.

To fix the issue increase NRF_BLE_FREERTOS_SDH_TASK_STACK in nrf_sdh_freertos.c, for instance to 512.

RE: Add Ble Scan to usbd_ble_uart_freertos example

Einar Thorsrud — Wed, 09 Jun 2021 18:13:43 GMT

Hi,

I did a naive test with a dummy peripheral that did not actually implement the NUS service, so no NUS service was discovered. Then I did not see any USB issues. Testing again with a device that actually implements the NUS service and where that is discovered I also see USB events missing. I need to look more into it, though.

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Wed, 09 Jun 2021 13:50:36 GMT

Hi Einar,

which SDK version are you using?

This is my log:

<info> app: USBD BLE UART example started.
<info> app: Connecting to target 4DB83F7296C5
<info> app: ATT MTU exchange completed.
<info> app: Ble NUS max data length set to 0xF4(244)
<info> app: Discovery complete.
<info> app: Connected to device with Nordic UART Service.

why i don't see in your logs the following messages:

<info> app: Discovery complete.
<info> app: Connected to device with Nordic UART Service.

Did you close the discovery module?

RE: Add Ble Scan to usbd_ble_uart_freertos example

Einar Thorsrud — Wed, 09 Jun 2021 12:59:11 GMT

Hi,

I took over this case from Susheel. I did just basic testing and then I see I get USB events even when connected. See log:

<info> app: USBD BLE UART example started.
<info> app: Connecting to target 45C36938A3C6
<info> app: ATT MTU exchange completed.
<info> app: Ble NUS max data length set to 0xF4(244)
<info> app: USB power detected
<info> app: USB ready
<info> app: USB power removed
<info> app: CDC ACM port closed

Can you elaborate on the procedure I should follow to reproduce the issue you are seeing, and explain it in a bit more detail?

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Wed, 09 Jun 2021 07:33:34 GMT

Thanks Susheel feel better

RE: Add Ble Scan to usbd_ble_uart_freertos example

Susheel Nuguru — Wed, 09 Jun 2021 04:29:12 GMT

I'm sorry for late response. I am on sick leave and will request my colleague too look into this.

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Tue, 08 Jun 2021 06:56:57 GMT

Good morning Susheel Nuguru

Waiting for advise from you

Thanks

RE: Add Ble Scan to usbd_ble_uart_freertos example

Susheel Nuguru — Thu, 03 Jun 2021 12:40:36 GMT

I am sorry, I did not manage to debug this today and I am off tomorrow, I will most likely continue to look at this on Monday

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Thu, 03 Jun 2021 08:28:45 GMT

Hi Susheel Nuguru,

attached minimalistic project with the problem.

devzone.nordicsemi.com/.../usbd_5F00_ble_5F00_with_5F00_scan_5F00_freertos.zip

Thanks

RE: Add Ble Scan to usbd_ble_uart_freertos example

Susheel Nuguru — Thu, 03 Jun 2021 06:23:05 GMT

Hmm, then the problem does not seem to be in the code usbd_isr or the usb thread. Need to understand what your application is doing in the "Connected" event. Can you give me your minimalistic project to be able to reproduce this behaviour?

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Wed, 02 Jun 2021 14:16:04 GMT

Hi,

i tried this but it didnt help

RE: Add Ble Scan to usbd_ble_uart_freertos example

shai.c — Wed, 02 Jun 2021 14:15:22 GMT

Hi,

I'm using the latest SDK 17.0.2

RE: Add Ble Scan to usbd_ble_uart_freertos example

Susheel Nuguru — Wed, 02 Jun 2021 13:37:11 GMT

maybe you should let the usbd event queue process to run first before waiting as I see one race condition with first waiting and then processing

    for (;;)
    {
        while (app_usbd_event_queue_process())
        {
            /* Nothing to do */
        }

        /* Waiting for event */
        UNUSED_RETURN_VALUE(ulTaskNotifyTake(pdTRUE, USB_THREAD_MAX_BLOCK_TIME));
    }

RE: Add Ble Scan to usbd_ble_uart_freertos example

Susheel Nuguru — Wed, 02 Jun 2021 13:31:34 GMT

Which SDK version are you using? Seems like one of the vTaskNotifyGiveFromISR is being lost making your USBD state machine stuck at wait and unable to create any new usbd events