CC2541: what is the function of the definition about SYS_EVENT_MSG in the file "simpleBLECentral.c " from SDK BLE-CC254x-1.4.2.2

user5774802

Part Number: CC2541

Dear Sir or Madam:

The codes below is in in the file "simpleBLECentral.c " from SDK BLE-CC254x-1.4.2.2:

uint16 SimpleBLECentral_ProcessEvent( uint8 task_id, uint16 events )
{
  
  VOID task_id; // OSAL required parameter that isn't used in this function
  
  if ( events & SYS_EVENT_MSG )
  {
    uint8 *pMsg;
    
    if ( (pMsg = osal_msg_receive( simpleBLETaskId )) != NULL )
    {
      simpleBLECentral_ProcessOSALMsg( (osal_event_hdr_t *)pMsg );

      // Release the OSAL message
      VOID osal_msg_deallocate( pMsg );
    }

    // return unprocessed events
    return (events ^ SYS_EVENT_MSG);
  }
    ........
    ........
}

The function below shows it implements the key function,

it is called in the function uint16 SimpleBLECentral_ProcessEvent( uint8 task_id, uint16 events )

static void simpleBLECentral_ProcessOSALMsg( osal_event_hdr_t *pMsg )
{
switch ( pMsg->event )

{
case KEY_CHANGE:
simpleBLECentral_HandleKeys( ((keyChange_t *)pMsg)->state, ((keyChange_t *)pMsg)->keys );
break;

case GATT_MSG_EVENT:
simpleBLECentralProcessGATTMsg( (gattMsgEvent_t *) pMsg );
break;
}
}

but I find the function does not work, or I misunderstand it?

Best Regards

Tom

over 6 years ago

0 YiKai Chen over 6 years ago

Guru 735685 points

What do you mean the function doesn’t work?

0 user5774802 over 6 years ago in reply to YiKai Chen

Intellectual 550 points

Hi YK Chen

if I write a print function printf_test after SYS_EVENT_MSG, no information outputs to screen. certainly, If I put the printf function in other position ,the printf function really works.

details can be seen below:

uint16 SimpleBLECentral_ProcessEvent( uint8 task_id, uint16 events )
{
  
  VOID task_id; // OSAL required parameter that isn't used in this function
  
  if ( events & SYS_EVENT_MSG )
  {
    uint8 *pMsg;
    
     printf_test("test for SYS_EVENT_MSG \r\n");
    if ( (pMsg = osal_msg_receive( simpleBLETaskId )) != NULL )
    {
      simpleBLECentral_ProcessOSALMsg( (osal_event_hdr_t *)pMsg );

      // Release the OSAL message
      VOID osal_msg_deallocate( pMsg );
    }

    // return unprocessed events
    return (events ^ SYS_EVENT_MSG);
  }
    ........
    ........
}

0 YiKai Chen over 6 years ago

Guru 735685 points

Do you trigger any key event or GATT event?

0 user5774802 over 6 years ago in reply to YiKai Chen

Intellectual 550 points

No, I don't trigger any key event or GATT event. CC2541 is new for me,I cannot find the code about how to trigger SYS_EVENT_MSG in the SDK BLE-CC254x-1.4.2.2. Can you do a favor to show me how to trigger SYS_EVENT_MSG in the SDK BLE-CC254x-1.4.2.2 ？

0 YiKai Chen over 6 years ago in reply to user5774802

Guru 735685 points

You should connect to any BLE peripheral device to trigger GATT event. Since you are begineer, I suggest you to read TI_BLE_Sample_Applications_Guide.pdf and TI_BLE_Software_Developer's_Guide.pdf under BLE-CC254x-1.4.2.2 Documents folder first.

0 user5774802 over 6 years ago in reply to YiKai Chen

Intellectual 550 points

Thanks a lot

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CC2541: what is the function of the definition about SYS_EVENT_MSG in the file "simpleBLECentral.c " from SDK BLE-CC254x-1.4.2.2