Hi, I'm trying to add the NUS service to an existing application (freertos based, SDK15.2, already use a custom service) I copied the relevant code snippets from the example Modified the project setup - Add ble_nus.c & ble_link_ctx_manager.c, increased start address + 0x10 bytes (for the additional service uuid) Updated sdk_config.h - increased NRF_SDH_BLE_VS_UUID_COUNT to 2 (was 1 for the prev proprietary service), BLE_NUS_ENABLED = 1 The app builds and runs to the point where I do BLE connect. The program crash when ble_nus.c on_connect() function calls blcm_link_ctx_get(), as the 1st parameters p_nus->p_link_ctx_storage == NULL. I had to add ble_link_ctx_manager.c to the project following the example project. However, I couldn't find what it does and how it is used/initialized Any advice will be appreciated. Thanks

So, to wrap up the story - Eventually, it was a packing problem indeed but on my side. There was one occurrence of #pragma pack(push) without matching #pragma pack(pop)... I hope this can help any fellow developer banging his head as I did. Happy new year everybody.

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Adding NUS to existing profile - how to get a 'link context' ?

eyalasko over 5 years ago

Hi,

I'm trying to add the NUS service to an existing application (freertos based, SDK15.2, already use a custom service)

I copied the relevant code snippets from the example
Modified the project setup - Add ble_nus.c & ble_link_ctx_manager.c, increased start address + 0x10 bytes (for the additional service uuid)
Updated sdk_config.h - increased NRF_SDH_BLE_VS_UUID_COUNT to 2 (was 1 for the prev proprietary service), BLE_NUS_ENABLED = 1

The app builds and runs to the point where I do BLE connect.

The program crash when ble_nus.c on_connect() function calls blcm_link_ctx_get(), as the 1st parameters p_nus->p_link_ctx_storage == NULL.

I had to add ble_link_ctx_manager.c to the project following the example project. However, I couldn't find what it does and how it is used/initialized

Any advice will be appreciated.

Thanks

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eyalasko over 5 years ago in reply to eyalasko +2 verified

So, to wrap up the story - Eventually, it was a packing problem indeed but on my side. There was one occurrence of #pragma pack(push) without matching #pragma pack(pop)... I hope this can help…

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0 Amanda Hsieh over 5 years ago

Hi,

Please check sdk_config.h. NRF_SDH_BLE_VS_UUID_COUNT parameter should be greater than zero

Softdevice should be configured to accept Vendor Specific UUIDs, like NUS Nordic UART Service.

-Amanda H.
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0 eyalasko over 5 years ago in reply to Amanda Hsieh

Hi,

NRF_SDH_BLE_VS_UUID_COUNT is set to 2 (see OP) as I have a proprietary service + NUS.

Any insight about the 'packing' issue described above?

Thanks
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0 Amanda Hsieh over 5 years ago in reply to eyalasko

Hi,

After adding NUS to the project, you would need to allocate more RAM to the SoftDevice.

Which version of SDK do you use?

Could you provide the J-Link RTT log?

-Amanda H.
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0 eyalasko over 5 years ago in reply to Amanda Hsieh

Amanda Hsieh said:
you would need to allocate more RAM to the SoftDevice.

I did. Otherwise one if the sd calls would have asserted (probably sd_ble_uuid_vs_add())

Amanda Hsieh said:
Which version of SDK do you use?

SDK 15.2, nRF52832, a project that is based on ble_app_hrs_freertos example

Amanda Hsieh said:
Could you provide the J-Link RTT log?

Attached RTT Client prints (after turning on BLE_NUS_CONFIG_LOG_ENABLED in sdk_config.h)

###RTT Client: ************************************************************
###RTT Client: *               SEGGER Microcontroller GmbH                *
###RTT Client: *   Solutions for real time microcontroller applications   *
###RTT Client: ************************************************************
###RTT Client: *                                                          *
###RTT Client: *       (c) 2012 - 2016  SEGGER Microcontroller GmbH       *
###RTT Client: *                                                          *
###RTT Client: *     www.segger.com     Support: [email protected]       *
###RTT Client: *                                                          *
###RTT Client: ************************************************************
###RTT Client: *                                                          *
###RTT Client: * SEGGER J-Link RTT Client   Compiled Aug 30 2018 17:38:24 *
###RTT Client: *                                                          *
###RTT Client: ************************************************************

###RTT Client: -----------------------------------------------
###RTT Client: Connecting to J-Link RTT Server via localhost:19021 .... Connected.
SEGGER J-Link V6.46 - Real time terminal output
J-Link OB-SAM3U128-V2-NordicSemi compiled Jan  7 2019 14:07:15 V1.0, SN=682324592
Process: UV4.exe
<info> app: *** myApp started [Jul  9 2019 22:52:34] ***
<info> app: <<<===  myApp 0.20.28.CF771A (Jul  9 2019 22:52:34) starting... ===>>>
<info> app: *** myApp started [Jul  9 2019 22:52:34] ***
<info> app: <<<===  myApp 0.20.28.CF771A (Jul  9 2019 22:52:34) starting... ===>>>
<info> app: Fast advertising.
<warning> app:  !! Pulse fault: status code = 0x40
<warning> app:     Pulse fault cleared
<error> hardfault: HARD FAULT at 0x0002E286                //  << This line triggered on connection
<error> hardfault:   R0:  0x00000000  R1:  0x00000000  R2:  0x200067F0  R3:  0x00000000
<error> hardfault:   R12: 0x000001F3  LR:  0x0003886F  PSR: 0x61000000
<error> hardfault: Cause: Data bus error (PC value stacked for the exception return points to the instruction that caused the fault).
<error> hardfault: Bus Fault Address: 0x00200028

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