Calling BLE functions from outside main

[siltvm]

HI,

We are working with nRF52832 chip for a custom product with OLED (ss1306) , external flash chip and QRcode sensor in it.

Successfully integrated the code which works as expected by properly configuring sdkconfig.h and related files.

But now our main.c is bulky and we are trying to separate the code to different functional blocks and managed to create custom components and code works fine.

Now we are converting the BLE functions as a separate block as we use ble_nus_data_send() functions in other blocks also.

but now we are able to send and receive nus data from the custom made ble function source code( same functions as different .c file), but these functions is not sending data when it is called in other .c files.

Application in a glance

QR code datas are scanned and the scanned data is saved in the external flash

We receive certain commands from BLE and we need to send responses accordingly.

On scanning QR codes , for some codes BLE data transfer is needed.

We are using SES v5.42a

SDK version 17.0.2.

Is it a good approach to change BLE functionalities from main.c ? Or is there any alternative methods to meet the requirement ?

Any help would be appreciated

thanks & regards

[Vidar Berg]

Hello,

Splitting the BLE part of the code from main.c should not be a problem. However, you must ensure that the 'm_nus' service structure declared by BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT); does not have multiple instances.

Best regards,

Vidar

[siltvm]

Hi Vidar,

Thanx for the reply .

First of all im new to nRF chips and BLE operations , suggestions/corrections are appreciated in my approach

This is my custom file for BLEoperations, i declared BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT);  here only and i added corresponding header files in main.c.

Fig below shows my main.c

but  "m_conn_handle 0 ErrorCode =8" is the debug msg received , means error code 8

#define NRF_ERROR_INVALID_STATE               (NRF_ERROR_BASE_NUM + 8)  ///< Invalid state, operation disallowed in this state . I feel the issue is something related with m_conn_handle

at the same time i can use ble_nus_data_send() function succesfully inside the nus_handler to acknowledge the data reception

[Vidar Berg]

Thanks for the additional information. Can you also show where main.c get the 'm_nus' instance from? Is it defined in main too? The important thing here is that main.c and BLEapplication.c are accessing the same variable.

EDIT: After reviewing the code more closely, I noticed that you are defining the variable in your BLEapplications.h header file. This will result in a new instance of 'm_nus' being defined in every source file that includes this header. To avoid this, you should define the variable in one of the source files and then share it with others, for example, via a pointer reference.

[siltvm]

Hi Vidar,

Sorry for the late reply.

As you suggested my code changes are as follows

Inside BLEApplications.h

extern ble_nus_t *p_m_nus;

extern ble_nus_t* get_nus_instance();

Inside BLEApplications.c

 static ble_nus_t m_nus;
 BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT);       

ble_nus_t* get_nus_instance()

  {      
    return &m_nus;
   }

 Inside main.c

    ble_nus_t *p_m_nus;
    p_m_nus = get_nus_instance();

    if(ConnectionStatus)
     {
        ErrorCode=ble_nus_data_send(p_m_nus, data_array, &length3, m_conn_handle);
        printf("ErrorCode =%d  m_conn_handle %x\n",ErrorCode,m_conn_handle);
     }

Now the BLE data transfer works fine from main.c, Thanx Vidar

 Inside Process.c

      ble_nus_t *p_m_nus;

       printf("Inside EraseDataFromFlash\n");
       p_m_nus = get_nus_instance();
       ResponseCode=ble_nus_data_send(p_m_nus, DATA_ERASED, ERASE_DATA_LEN,            m_conn_handle);//Send BLE acknowledgement
      
       memset(TempData,0,sizeof(TempData));
       sprintf(TempData, "\nResponseCode =%d\n",ResponseCode);
       printf(TempData);

But debug msg says ResponseCode =5

Is this the correct implementation of your suggestion?

I think something is missing here, but couldnt find it.


Actually i didnt get the purpose and implementation of 

BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT); macro

thanks & regards

[Vidar Berg]

Hi,

ble_nus_data_send() will return NRF_ERROR_NOT_FOUND (5) if m_conn_handle == 0, or p_m_nus == NULL.

[siltvm]

Hi,

That was a mistake from the application code writen by me.

 ble_nus_t *p_m_nus3;
 p_m_nus3 = get_nus_instance();

 length=sizeof(RecvBuff);
 ResponseCode=ble_nus_data_send(p_m_nus3, RecvBuff, &length, m_conn_handle);
               
Now code works as expected , i can send BLE data using ble_nus_data_send() function from main.c as well as process.c

Thanx Vidar for the support so far.

Now i just started learning about nrfconnect sdk as we need to port the code to get maximum available options in development.

Further support is anticipated. Thanks once again

thanks & regards