TI BLE STACK - OSAL

TI 的OSAL做的很不错，不过看起来也挺费劲可能自己水平太差吧，网上买的谷雨的开发板觉得确实挺不错的。

做点学习笔记，首先是记录OSAL里执行的顺序流程，主要是task ，event，message

1，

APP_Main.c:

/* Initialize the operating system */
osal_init_system();

其中初始化了

// Initialize the system tasks.
osalInitTasks();

 /*********************************************************************
  * @fn      osalInitTasks
  *
  * @brief   This function invokes the initialization function for each task.
  *
  * @param   void
  *
  * @return  none
  */
 void osalInitTasks( void )
 {
   uint8 taskID = ;
 
   tasksEvents = (uint16 *)osal_mem_alloc( sizeof( uint16 ) * tasksCnt);
   osal_memset( tasksEvents, , (sizeof( uint16 ) * tasksCnt));
 
   /* LL Task */
   LL_Init( taskID++ );
 
   /* Hal Task */
   Hal_Init( taskID++ );
 
   /* HCI Task */
   HCI_Init( taskID++ );
 
 #if defined ( OSAL_CBTIMER_NUM_TASKS )
   /* Callback Timer Tasks */
   osal_CbTimerInit( taskID );
   taskID += OSAL_CBTIMER_NUM_TASKS;
 #endif
 
   /* L2CAP Task */
   L2CAP_Init( taskID++ );
 
   /* GAP Task */
   GAP_Init( taskID++ );
 
   /* GATT Task */
   GATT_Init( taskID++ );
 
   /* SM Task */
   SM_Init( taskID++ );
 
   /* Profiles */
   GAPRole_Init( taskID++ );
   GAPBondMgr_Init( taskID++ );
 
   GATTServApp_Init( taskID++ );
 
   /* Application */
   SimpleBLEPeripheral_Init( taskID );
 }

osalInitTasks

这个很关键，这个函数在OSAL_APP.c，初始化了所有的task以及tasksEvents，用来存储每个task中的事件表。

tasksEvents = (uint16 *)osal_mem_alloc( sizeof( uint16 ) * tasksCnt);
osal_memset( tasksEvents, 0, (sizeof( uint16 ) * tasksCnt));

2，task存放：

 // The order in this table must be identical to the task initialization calls below in osalInitTask.
 const pTaskEventHandlerFn tasksArr[] =
 {
   LL_ProcessEvent,                                                  // task 0
   Hal_ProcessEvent,                                                 // task 1
   HCI_ProcessEvent,                                                 // task 2
 #if defined ( OSAL_CBTIMER_NUM_TASKS )
   OSAL_CBTIMER_PROCESS_EVENT( osal_CbTimerProcessEvent ),           // task 3
 #endif
   L2CAP_ProcessEvent,                                               // task 4
   GAP_ProcessEvent,                                                 // task 5
   GATT_ProcessEvent,                                                // task 6
   SM_ProcessEvent,                                                  // task 7
   GAPRole_ProcessEvent,                                             // task 8
   GAPBondMgr_ProcessEvent,                                          // task 9
   GATTServApp_ProcessEvent,                                         // task 10
   SimpleBLEPeripheral_ProcessEvent                                  // task 11
 };

tasksArr[]

OSAL_APP.c 之后程序的各任务函数都在这里。

typedef unsigned short (*pTaskEventHandlerFn)( unsigned char task_id, unsigned short event );

3，task，os启动

APP_Main.c:

/* Start OSAL */
osal_start_system(); // No Return from here

这里进入无限循环：

 void osal_start_system( void )
 {
 #if !defined ( ZBIT ) && !defined ( UBIT )
   for(;;)  // Forever Loop
 #endif
   {
     osal_run_system();
   }
 }

osal_start_system

主要调用每个task判断在其中的osal_run_system

 /*********************************************************************
  * @fn      osal_run_system
  *
  * @brief
  *
  *   This function will make one pass through the OSAL taskEvents table
  *   and call the task_event_processor() function for the first task that
  *   is found with at least one event pending. If there are no pending
  *   events (all tasks), this function puts the processor into Sleep.
  *
  * @param   void
  *
  * @return  none
  */
 void osal_run_system( void )
 {
   uint8 idx = ;
 
 #ifndef HAL_BOARD_CC2538
   osalTimeUpdate();
 #endif
 
   Hal_ProcessPoll();
 
   do {
     if (tasksEvents[idx])  // Task is highest priority that is ready.
     {
       break;
     }
   } while (++idx < tasksCnt);
 
   if (idx < tasksCnt)
   {
     uint16 events;
     halIntState_t intState;
 
     HAL_ENTER_CRITICAL_SECTION(intState);
     events = tasksEvents[idx];
     tasksEvents[idx] = ;  // Clear the Events for this task.
     HAL_EXIT_CRITICAL_SECTION(intState);
 
     activeTaskID = idx;
     events = (tasksArr[idx])( idx, events );
     activeTaskID = TASK_NO_TASK;
 
     HAL_ENTER_CRITICAL_SECTION(intState);
     tasksEvents[idx] |= events;  // Add back unprocessed events to the current task.
     HAL_EXIT_CRITICAL_SECTION(intState);
   }
 #if defined( POWER_SAVING )
   else  // Complete pass through all task events with no activity?
   {
     osal_pwrmgr_powerconserve();  // Put the processor/system into sleep
   }
 #endif
 
   /* Yield in case cooperative scheduling is being used. */
 #if defined (configUSE_PREEMPTION) && (configUSE_PREEMPTION == 0)
   {
     osal_task_yield();
   }
 #endif
 }

osal_run_system

先按task id判断优先级在前的task跳出来，然后根据event来执行程序。所谓根据event来执行是在task的主函数中通过if来判断：

比如我现在看的SimpleBLEPeripheral_ProcessEvent（）也就是我们的application task

 /*********************************************************************
  * @fn      SimpleBLEPeripheral_ProcessEvent
  *
  * @brief   Simple BLE Peripheral Application Task event processor.  This function
  *          is called to process all events for the task.  Events
  *          include timers, messages and any other user defined events.
  *
  * @param   task_id  - The OSAL assigned task ID.
  * @param   events - events to process.  This is a bit map and can
  *                   contain more than one event.
  *
  * @return  events not processed
  */
 uint16 SimpleBLEPeripheral_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( simpleBLEPeripheral_TaskID )) != NULL )
     {
       simpleBLEPeripheral_ProcessOSALMsg( (osal_event_hdr_t *)pMsg );
 
       // Release the OSAL message
       VOID osal_msg_deallocate( pMsg );
     }
 
     // return unprocessed events
     return (events ^ SYS_EVENT_MSG);
   }
 
   if ( events & SBP_START_DEVICE_EVT )
   {
     // Start the Device
     VOID GAPRole_StartDevice( &simpleBLEPeripheral_PeripheralCBs );
 
     // Start Bond Manager
     VOID GAPBondMgr_Register( &simpleBLEPeripheral_BondMgrCBs );
 
     // Set timer for first periodic event
     osal_start_timerEx( simpleBLEPeripheral_TaskID, SBP_PERIODIC_EVT, SBP_PERIODIC_EVT_PERIOD );
 
     return ( events ^ SBP_START_DEVICE_EVT );
   }
 
   if ( events & SBP_PERIODIC_EVT )
   {
     // Restart timer
     if ( SBP_PERIODIC_EVT_PERIOD )
     {
       osal_start_timerEx( simpleBLEPeripheral_TaskID, SBP_PERIODIC_EVT, SBP_PERIODIC_EVT_PERIOD );
     }
 
     // Perform periodic application task
     performPeriodicTask();
 
     return (events ^ SBP_PERIODIC_EVT);
   }
 
 #if defined ( PLUS_BROADCASTER )
   if ( events & SBP_ADV_IN_CONNECTION_EVT )
   {
     uint8 turnOnAdv = TRUE;
     // Turn on advertising while in a connection
     GAPRole_SetParameter( GAPROLE_ADVERT_ENABLED, sizeof( uint8 ), &turnOnAdv );
 
     return (events ^ SBP_ADV_IN_CONNECTION_EVT);
   }
 #endif // PLUS_BROADCASTER
 
   // Discard unknown events
   return ;
 }

SimpleBLEPeripheral_ProcessEvent

看到先执行：SYS_EVENT_MSG然后是SBP_START_DEVICE_EVT

每个EVENT执行完就return保证不过多占用CPU，

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

return之后又会回到osal_run_system循环

4，event插入：

先不说SYS_EVENT_MSG，

刚才的SBP_START_DEVICE_EVT是在初始化时候就插入的

osalInitTasks();中的void SimpleBLEPeripheral_Init( uint8 task_id )

 /*********************************************************************
  * @fn      SimpleBLEPeripheral_Init
  *
  * @brief   Initialization function for the Simple BLE Peripheral App Task.
  *          This is called during initialization and should contain
  *          any application specific initialization (ie. hardware
  *          initialization/setup, table initialization, power up
  *          notificaiton ... ).
  *
  * @param   task_id - the ID assigned by OSAL.  This ID should be
  *                    used to send messages and set timers.
  *
  * @return  none
  */
 void SimpleBLEPeripheral_Init( uint8 task_id )
 {
   simpleBLEPeripheral_TaskID = task_id;
 
   // Setup the GAP
   VOID GAP_SetParamValue( TGAP_CONN_PAUSE_PERIPHERAL, DEFAULT_CONN_PAUSE_PERIPHERAL );
 
   // Setup the GAP Peripheral Role Profile
   {
     #if defined( CC2540_MINIDK )
       // For the CC2540DK-MINI keyfob, device doesn't start advertising until button is pressed
       uint8 initial_advertising_enable = FALSE;
     #else
       // For other hardware platforms, device starts advertising upon initialization
       uint8 initial_advertising_enable = TRUE;
     #endif
 
     // By setting this to zero, the device will go into the waiting state after
     // being discoverable for 30.72 second, and will not being advertising again
     // until the enabler is set back to TRUE
     uint16 gapRole_AdvertOffTime = ;
 
     uint8 enable_update_request = DEFAULT_ENABLE_UPDATE_REQUEST;
     uint16 desired_min_interval = DEFAULT_DESIRED_MIN_CONN_INTERVAL;
     uint16 desired_max_interval = DEFAULT_DESIRED_MAX_CONN_INTERVAL;
     uint16 desired_slave_latency = DEFAULT_DESIRED_SLAVE_LATENCY;
     uint16 desired_conn_timeout = DEFAULT_DESIRED_CONN_TIMEOUT;
 
     // Set the GAP Role Parameters
     GAPRole_SetParameter( GAPROLE_ADVERT_ENABLED, sizeof( uint8 ), &initial_advertising_enable );
     GAPRole_SetParameter( GAPROLE_ADVERT_OFF_TIME, sizeof( uint16 ), &gapRole_AdvertOffTime );
 
     GAPRole_SetParameter( GAPROLE_SCAN_RSP_DATA, sizeof ( scanRspData ), scanRspData );
     GAPRole_SetParameter( GAPROLE_ADVERT_DATA, sizeof( advertData ), advertData );
 
     GAPRole_SetParameter( GAPROLE_PARAM_UPDATE_ENABLE, sizeof( uint8 ), &enable_update_request );
     GAPRole_SetParameter( GAPROLE_MIN_CONN_INTERVAL, sizeof( uint16 ), &desired_min_interval );
     GAPRole_SetParameter( GAPROLE_MAX_CONN_INTERVAL, sizeof( uint16 ), &desired_max_interval );
     GAPRole_SetParameter( GAPROLE_SLAVE_LATENCY, sizeof( uint16 ), &desired_slave_latency );
     GAPRole_SetParameter( GAPROLE_TIMEOUT_MULTIPLIER, sizeof( uint16 ), &desired_conn_timeout );
   }
 
   // Set the GAP Characteristics
   GGS_SetParameter( GGS_DEVICE_NAME_ATT, GAP_DEVICE_NAME_LEN, attDeviceName );
 
   // Set advertising interval
   {
     uint16 advInt = DEFAULT_ADVERTISING_INTERVAL;
 
     GAP_SetParamValue( TGAP_LIM_DISC_ADV_INT_MIN, advInt );
     GAP_SetParamValue( TGAP_LIM_DISC_ADV_INT_MAX, advInt );
     GAP_SetParamValue( TGAP_GEN_DISC_ADV_INT_MIN, advInt );
     GAP_SetParamValue( TGAP_GEN_DISC_ADV_INT_MAX, advInt );
   }
 
   // Setup the GAP Bond Manager
   {
     uint32 passkey = ; // passkey "000000"
     uint8 pairMode = GAPBOND_PAIRING_MODE_WAIT_FOR_REQ;
     uint8 mitm = TRUE;
     uint8 ioCap = GAPBOND_IO_CAP_DISPLAY_ONLY;
     uint8 bonding = TRUE;
     GAPBondMgr_SetParameter( GAPBOND_DEFAULT_PASSCODE, sizeof ( uint32 ), &passkey );
     GAPBondMgr_SetParameter( GAPBOND_PAIRING_MODE, sizeof ( uint8 ), &pairMode );
     GAPBondMgr_SetParameter( GAPBOND_MITM_PROTECTION, sizeof ( uint8 ), &mitm );
     GAPBondMgr_SetParameter( GAPBOND_IO_CAPABILITIES, sizeof ( uint8 ), &ioCap );
     GAPBondMgr_SetParameter( GAPBOND_BONDING_ENABLED, sizeof ( uint8 ), &bonding );
   }
 
   // Initialize GATT attributes
   GGS_AddService( GATT_ALL_SERVICES );            // GAP
   GATTServApp_AddService( GATT_ALL_SERVICES );    // GATT attributes
   DevInfo_AddService();                           // Device Information Service
   SimpleProfile_AddService( GATT_ALL_SERVICES );  // Simple GATT Profile
 #if defined FEATURE_OAD
   VOID OADTarget_AddService();                    // OAD Profile
 #endif
 
   // Setup the SimpleProfile Characteristic Values
   {
     uint8 charValue1 = ;
     uint8 charValue2 = ;
     uint8 charValue3 = ;
     uint8 charValue4 = ;
     uint8 charValue5[SIMPLEPROFILE_CHAR5_LEN] = { , , , ,  };
     SimpleProfile_SetParameter( SIMPLEPROFILE_CHAR1, sizeof ( uint8 ), &charValue1 );
     SimpleProfile_SetParameter( SIMPLEPROFILE_CHAR2, sizeof ( uint8 ), &charValue2 );
     SimpleProfile_SetParameter( SIMPLEPROFILE_CHAR3, sizeof ( uint8 ), &charValue3 );
     SimpleProfile_SetParameter( SIMPLEPROFILE_CHAR4, sizeof ( uint8 ), &charValue4 );
     SimpleProfile_SetParameter( SIMPLEPROFILE_CHAR5, SIMPLEPROFILE_CHAR5_LEN, charValue5 );
   }
 
 #if defined( CC2540_MINIDK )
 
   SK_AddService( GATT_ALL_SERVICES ); // Simple Keys Profile
 
   // Register for all key events - This app will handle all key events
   RegisterForKeys( simpleBLEPeripheral_TaskID );
 
   // makes sure LEDs are off
   HalLedSet( (HAL_LED_1 | HAL_LED_2), HAL_LED_MODE_OFF );
 
   // For keyfob board set GPIO pins into a power-optimized state
   // Note that there is still some leakage current from the buzzer,
   // accelerometer, LEDs, and buttons on the PCB.
 
   P0SEL = ; // Configure Port 0 as GPIO
   P1SEL = ; // Configure Port 1 as GPIO
   P2SEL = ; // Configure Port 2 as GPIO
 
   P0DIR = 0xFC; // Port 0 pins P0.0 and P0.1 as input (buttons),
                 // all others (P0.2-P0.7) as output
   P1DIR = 0xFF; // All port 1 pins (P1.0-P1.7) as output
   P2DIR = 0x1F; // All port 1 pins (P2.0-P2.4) as output
 
   P0 = 0x03; // All pins on port 0 to low except for P0.0 and P0.1 (buttons)
   P1 = ;   // All pins on port 1 to low
   P2 = ;   // All pins on port 2 to low
 
 #endif // #if defined( CC2540_MINIDK )
 
 #if (defined HAL_LCD) && (HAL_LCD == TRUE)
 
 #if defined FEATURE_OAD
   #if defined (HAL_IMAGE_A)
     HalLcdWriteStringValue( "BLE Peri-A", OAD_VER_NUM( _imgHdr.ver ), , HAL_LCD_LINE_1 );
   #else
     HalLcdWriteStringValue( "BLE Peri-B", OAD_VER_NUM( _imgHdr.ver ), , HAL_LCD_LINE_1 );
   #endif // HAL_IMAGE_A
 #else
   HalLcdWriteString( "BLE Peripheral", HAL_LCD_LINE_1 );
 #endif // FEATURE_OAD
 
 #endif // (defined HAL_LCD) && (HAL_LCD == TRUE)
 
   // Register callback with SimpleGATTprofile
   VOID SimpleProfile_RegisterAppCBs( &simpleBLEPeripheral_SimpleProfileCBs );
 
   // Enable clock divide on halt
   // This reduces active current while radio is active and CC254x MCU
   // is halted
   HCI_EXT_ClkDivOnHaltCmd( HCI_EXT_ENABLE_CLK_DIVIDE_ON_HALT );
 
 #if defined ( DC_DC_P0_7 )
 
   // Enable stack to toggle bypass control on TPS62730 (DC/DC converter)
   HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P0, HCI_EXT_PM_IO_PORT_PIN7 );
 
 #endif // defined ( DC_DC_P0_7 )
 
   // Setup a delayed profile startup
   osal_set_event( simpleBLEPeripheral_TaskID, SBP_START_DEVICE_EVT );
 
 }

SimpleBLEPeripheral_Init

最后一句：

// Setup a delayed profile startup
osal_set_event( simpleBLEPeripheral_TaskID, SBP_START_DEVICE_EVT );

5，message：

只能简单做个笔记不细说它的功能作用，我们在SimpleBLEPeripheral_ProcessEvent的SYS_EVENT_MSG中看到的，一般message在这发送的是key事件，传回key的值这样可以带一些自己的data，不像event只是标志。

至于这个key的来源：

1，之前已经初始化过hal_key,在前面可以找到，

/* Initialize Key stuff */
OnboardKeyIntEnable = HAL_KEY_INTERRUPT_ENABLE;
//OnboardKeyIntEnable = HAL_KEY_INTERRUPT_DISABLE;
HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);

SimpleBLEPeripheral_Init中注册，把key和task联系起来，也就是key按了之后通知哪个task

// Register for all key events - This app will handle all key events
RegisterForKeys( simpleBLEPeripheral_TaskID );

2，执行顺序首先是按键引起中断：

一旦有中断发生，中断函数首先跳转到

HAL_ISR_FUNCTION( halKeyPort0Isr, P0INT_VECTOR )

{

  halProcessKeyInterrupt();

 

………

}

hal_key.c中void halProcessKeyInterrupt (void)

 /**************************************************************************************************
  * @fn      halProcessKeyInterrupt
  *
  * @brief   Checks to see if it's a valid key interrupt, saves interrupt driven key states for
  *          processing by HalKeyRead(), and debounces keys by scheduling HalKeyRead() 25ms later.
  *
  * @param
  *
  * @return
  **************************************************************************************************/
 void halProcessKeyInterrupt (void)
 {
   bool valid=FALSE;
 
 #if defined ( CC2540_MINIDK )
   if( HAL_KEY_SW_1_PXIFG & HAL_KEY_SW_1_BIT) /* Interrupt Flag has been set by SW1 */
   {
     HAL_KEY_SW_1_PXIFG = ~(HAL_KEY_SW_1_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 
   if (HAL_KEY_SW_2_PXIFG & HAL_KEY_SW_2_BIT)  /* Interrupt Flag has been set by SW2 */
   {
     HAL_KEY_SW_2_PXIFG = ~(HAL_KEY_SW_2_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #else
   if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_6_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 
   if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #endif
   if (valid)
   {
     osal_start_timerEx (Hal_TaskID, HAL_KEY_EVENT, HAL_KEY_DEBOUNCE_VALUE);
   }
 }

void halProcessKeyInterrupt (void)

判断是否中断，中断清楚标志，最后osal_start_timerEx (Hal_TaskID, HAL_KEY_EVENT, HAL_KEY_DEBOUNCE_VALUE);

这是告诉Hal_TaskID 的task，发生了HAL_KEY_EVENT，延时HAL_KEY_DEBOUNCE_VALUE之后执行，这里延时个人认为是去抖动

3，

Hal_TaskID 的task在hal_drive.c中

uint16 Hal_ProcessEvent( uint8 task_id, uint16 events )

if (events & HAL_KEY_EVENT)
{
#if (defined HAL_KEY) && (HAL_KEY == TRUE)
/* Check for keys */
HalKeyPoll();

/* if interrupt disabled, do next polling */
if (!Hal_KeyIntEnable)
{
osal_start_timerEx( Hal_TaskID, HAL_KEY_EVENT, 100);
}
#endif
return events ^ HAL_KEY_EVENT;
}

执行了HalKeyPoll();函数，注意后面if如果没有中断则100ms后再启动这个event，没有中断就是在这轮询

4，HalKeyPoll()

 /**************************************************************************************************
  * @fn      HalKeyPoll
  *
  * @brief   Called by hal_driver to poll the keys
  *
  * @param   None
  *
  * @return  None
  **************************************************************************************************/
 void HalKeyPoll (void)
 {
   uint8 keys = ;
   uint8 notify = ;
 #if defined (CC2540_MINIDK)
   if (!(HAL_KEY_SW_1_PORT & HAL_KEY_SW_1_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_1;
   }
   if (!(HAL_KEY_SW_2_PORT & HAL_KEY_SW_2_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_2;
   }
 #else
   if (!(HAL_KEY_SW_6_PORT & HAL_KEY_SW_6_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_6;
   }
 
   if ((HAL_KEY_JOY_MOVE_PORT & HAL_KEY_JOY_MOVE_BIT))  /* Key is active HIGH */
   {
     keys = halGetJoyKeyInput();
   }
 #endif
 
   /* If interrupts are not enabled, previous key status and current key status
    * are compared to find out if a key has changed status.
    */
   if (!Hal_KeyIntEnable)
   {
     if (keys == halKeySavedKeys)
     {
       /* Exit - since no keys have changed */
       return;
     }
     else
     {
       notify = ;
     }
   }
   else
   {
     /* Key interrupt handled here */
     if (keys)
     {
       notify = ;
     }
   }
 
   /* Store the current keys for comparation next time */
   halKeySavedKeys = keys;
 
   /* Invoke Callback if new keys were depressed */
   if (notify && (pHalKeyProcessFunction))
   {
     (pHalKeyProcessFunction) (keys, HAL_KEY_STATE_NORMAL);
 
   }
 }

HalKeyPoll()

前面是判断哪个被按下，最后一句很关键：

/* Invoke Callback if new keys were depressed */
if (notify && (pHalKeyProcessFunction))
{
(pHalKeyProcessFunction) (keys, HAL_KEY_STATE_NORMAL);

}

回调函数这时候启动OnBoard_KeyCallback这在之前的初始化时候和pHalKeyProcessFunction挂钩

5，

 /*********************************************************************
  * @fn      OnBoard_KeyCallback
  *
  * @brief   Callback service for keys
  *
  * @param   keys  - keys that were pressed
  *          state - shifted
  *
  * @return  void
  *********************************************************************/
 void OnBoard_KeyCallback ( uint8 keys, uint8 state )
 {
   uint8 shift;
   (void)state;
 
   // shift key (S1) is used to generate key interrupt
   // applications should not use S1 when key interrupt is enabled
   shift = (OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE) ? false : ((keys & HAL_KEY_SW_6) ? true : false);
 
   if ( OnBoard_SendKeys( keys, shift ) != SUCCESS )
   {
     // Process SW1 here
     if ( keys & HAL_KEY_SW_1 )  // Switch 1
     {
     }
     // Process SW2 here
     if ( keys & HAL_KEY_SW_2 )  // Switch 2
     {
     }
     // Process SW3 here
     if ( keys & HAL_KEY_SW_3 )  // Switch 3
     {
     }
     // Process SW4 here
     if ( keys & HAL_KEY_SW_4 )  // Switch 4
     {
     }
     // Process SW5 here
     if ( keys & HAL_KEY_SW_5 )  // Switch 5
     {
     }
     // Process SW6 here
     if ( keys & HAL_KEY_SW_6 )  // Switch 6
     {
     }
   }
 
   /* If any key is currently pressed down and interrupt
      is still enabled, disable interrupt and switch to polling */
   if( keys !=  )
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_DISABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }
   /* If no key is currently pressed down and interrupt
      is disabled, enable interrupt and turn off polling */
   else
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_DISABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_ENABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }
 }

OnBoard_KeyCallback

在on_board.c中

主要的一句：OnBoard_SendKeys( keys, shift )这里发送给了前台task

 *********************************************************************
  * @fn      OnBoard_SendKeys
  *
  * @brief   Send "Key Pressed" message to application.
  *
  * @param   keys  - keys that were pressed
  *          state - shifted
  *
  * @return  status
  *********************************************************************/
 uint8 OnBoard_SendKeys( uint8 keys, uint8 state )
 {
   keyChange_t *msgPtr;
 
   if ( registeredKeysTaskID != NO_TASK_ID )
   {
     // Send the address to the task
     msgPtr = (keyChange_t *)osal_msg_allocate( sizeof(keyChange_t) );
     if ( msgPtr )
     {
       msgPtr->hdr.event = KEY_CHANGE;
       msgPtr->state = state;
       msgPtr->keys = keys;
 
       osal_msg_send( registeredKeysTaskID, (uint8 *)msgPtr );
     }
     return ( SUCCESS );
   }
   else
     return ( FAILURE );
 }

OnBoard_SendKeys

osal_msg_send( registeredKeysTaskID, (uint8 *)msgPtr );

registeredKeysTaskID之前初始化注册ID我们的apptask，并且这个函数osal_msg_send会触发一个SYS_EVENT_MSG这样就到了前台

6，msg的各种结构：

 static void simpleBLEPeripheral_ProcessOSALMsg( osal_event_hdr_t *pMsg )
 {
 switch ( pMsg->event )
 {
 #if defined( CC2540_MINIDK )
 case KEY_CHANGE:
 simpleBLEPeripheral_HandleKeys( ((keyChange_t *)pMsg)->state, ((keyChange_t *)pMsg)->keys );
 break;
 #endif // #if defined( CC2540_MINIDK )
 
 default:
 // do nothing
 break;
 }
 }

simpleBLEPeripheral_ProcessOSALMsg

typedef struct
{
uint8 event;
uint8 status;
} osal_event_hdr_t;

到了key：

typedef struct
{
osal_event_hdr_t hdr;
uint8 state; // shift
uint8 keys; // keys
} keyChange_t;

最开始时候：

uint8 *pMsg;

if ( (pMsg = osal_msg_receive( simpleBLEPeripheral_TaskID )) != NULL )
{
simpleBLEPeripheral_ProcessOSALMsg( (osal_event_hdr_t *)pMsg );

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

注意osal_msg_deallocate释放这样就算走完了一遍key

以及整个工程的流程了，花了两三天时间看完的，感谢谷雨资料