TI OSAL解析

来源：互联网发布：知乎评价章泽天长相编辑：程序博客网时间：2024/06/06 12:32

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TI OSAL 解析

先看看《OSAL操作系统-实验01 OSAL初探》中对osal的main函数的解析解析：

int main(void)

{

/*Initialize hardware */

HAL_BOARD_INIT(); //初始化时钟稳定时钟等等

//Initialize board I/O

//冷启动，关闭了led灯与中断，一边接下来的各种初始化不受干扰

InitBoard( OB_COLD );

/*Initialze the HAL driver */

HalDriverInit(); //各种驱动的初始化、如按键、lcd、adc、usb、uart等

/*Initialize NV system */

//snv 内部用于保存配对数据或你的用户自定义数据的一段flash，4kB空间

osal_snv_init();

/*Initialize LL */

/*Initialize the operating system */

//oasl 操作系统初始化, 包含内存分配、消息队列、定时器、电源管理和任务等

osal_init_system();

/*Enable interrupts */

HAL_ENABLE_INTERRUPTS();// 开启全局中断

//Final board initialization

InitBoard( OB_READY ); //设置标志标示系统初始化完毕

#ifdefined ( POWER_SAVING )

// 如果你使能了低功耗，就启动低功耗模式，

osal_pwrmgr_device( PWRMGR_BATTERY );

#endif

低功耗部分

1.如何总是在PM1

osal_pwrmgr_device( PWRMGR_ALWAYS_ON );

2.如何进入PM2

osal_pwrmgr_device( PWRMGR_BATTERY );在空闲的时候就会进入到PM2模式

3.如何进入PM3

存在连接就断开连接，存在广播就停掉广播，并确认自己创建的所有定时任务都已关闭，

则系统应该就会进入PM3模式，只能进行外部中断唤醒

/*Start OSAL */

osal_start_system(); // No Return from here

/* osal 操作系统启动，实际上是一个大循环，只是检查相对应的标志位，

就指定相对应的任务,看到这里，同学们应该往哪里看呢?其实，这已经是尽头了?那么我们的应用程序是在哪里写的呢

其实是在上面的上面的函数 osal_init_system 里就初始化了，现在回过头去看看

osal_init_system 这个函数内部就知道了

return 0;

}

涉及osal的有三个函数：

/*Initialize NV system */

//snv 内部用于保存配对数据或你的用户自定义数据的一段flash，4kB空间

osal_snv_init();

/*Initialize the operating system */

//oasl 操作系统初始化, 包含内存分配、消息队列、定时器、电源管理和任务等

osal_init_system();

/*Start OSAL */

osal_start_system(); // No Return from here

下面是《OSAL操作系统-实验01 OSAL初探》的主函数：
int main(void)
{
/* Initialize hardware */
HAL_BOARD_INIT();

// Initialize board I/O
InitBoard( OB_COLD );

/* Initialze the HAL driver */
HalDriverInit();

/* Initialize NV system */
osal_snv_init();

/* Initialize LL */

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

/* Enable interrupts */
HAL_ENABLE_INTERRUPTS();

// Final board initialization
InitBoard( OB_READY );

#if defined ( POWER_SAVING )
osal_pwrmgr_device( PWRMGR_BATTERY );
#endif

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

return 0;
}

我们先从 osal_start_system中的osal_run_system函数的任务调度部分开始：

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] = 0; // 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);
}

这里是通过tasksEvents判断任务有没有挂起，我们看看他的定义：

const uint8 tasksCnt = sizeof( tasksArr ) / sizeof( tasksArr[0] );
uint16 *tasksEvents;

void osalInitTasks( void )
{
uint8 taskID = 0;

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

.................

}

从这里可以看出tasksEvents是一个uint16 *指针数组，tasksArr中每一个任务都分配了一个tasksEvents，也就是16位的标志位。只要相应的tasksEvents标志位非0则认为该任务条件被触发！下面就是设置和清除事件的函数：

/*********************************************************************
* @fn      osal_set_event
*
* @brief
*
*    This function is called to set the event flags for a task. The
*    event passed in is OR'd into the task's event variable.
*
* @param   uint8 task_id - receiving tasks ID
* @param   uint8 event_flag - what event to set
*
* @return SUCCESS, INVALID_TASK
*/
uint8 osal_set_event( uint8 task_id, uint16 event_flag )
{
if ( task_id < tasksCnt )
{
    halIntState_t   intState;
    HAL_ENTER_CRITICAL_SECTION(intState);    // Hold off interrupts
    tasksEvents[task_id] |= event_flag; // Stuff the event bit(s)
    HAL_EXIT_CRITICAL_SECTION(intState);     // Release interrupts
    return ( SUCCESS );
}
   else
{
    return ( INVALID_TASK );
}
}

/*********************************************************************
* @fn      osal_clear_event
*
* @brief
*
*    This function is called to clear the event flags for a task. The
*    event passed in is masked out of the task's event variable.
*
* @param   uint8 task_id - receiving tasks ID
* @param   uint8 event_flag - what event to clear
*
* @return SUCCESS, INVALID_TASK
*/
uint8 osal_clear_event( uint8 task_id, uint16 event_flag )
{
if ( task_id < tasksCnt )
{
    halIntState_t   intState;
    HAL_ENTER_CRITICAL_SECTION(intState);    // Hold off interrupts
    tasksEvents[task_id] &= ~(event_flag);   // Clear the event bit(s)
    HAL_EXIT_CRITICAL_SECTION(intState);     // Release interrupts
    return ( SUCCESS );
}
   else
{
    return ( INVALID_TASK );
}
}

回到osal_run_system函数当发现有任务运行的时候就调用events = (tasksArr[idx])( idx, events );执行指针函数！

osal_set_event函数的调用流程（例子：Peripheral.c (projects\ble\profiles\roles): VOID osal_set_event( gapRole_TaskID, START_ADVERTISING_EVT );）：

VOID osal_set_event( gapRole_TaskID, START_ADVERTISING_EVT );

-------》

void GAPRole_Init( uint8 task_id )
{
gapRole_TaskID = task_id;

gapRole_state = GAPROLE_INIT;
gapRole_ConnectionHandle = INVALID_CONNHANDLE;

....................

}

--》

void osalInitTasks( void )
{
uint8 taskID = 0;
...................................

/* GATT Task */
GATT_Init( taskID++ );
...............................
}

->>>
const pTaskEventHandlerFn tasksArr[] =
{
.....................................................
GAPRole_ProcessEvent, // task 8
...........................................
};

->>>

uint16 GAPRole_ProcessEvent( uint8 task_id, uint16 events )
{
VOID task_id; // OSAL required parameter that isn't used in this function
.................................................
if ( events & START_ADVERTISING_EVT )
{
    if ( gapRole_AdvEnabled )
    {
      gapAdvertisingParams_t params;

      // Setup advertisement parameters
      params.eventType = gapRole_AdvEventType;
      params.initiatorAddrType = gapRole_AdvDirectType;
      VOID osal_memcpy( params.initiatorAddr, gapRole_AdvDirectAddr, B_ADDR_LEN );
      params.channelMap = gapRole_AdvChanMap;
      params.filterPolicy = gapRole_AdvFilterPolicy;

      if ( GAP_MakeDiscoverable( gapRole_TaskID, &params ) != SUCCESS )
      {
        gapRole_state = GAPROLE_ERROR;

        // Notify the application with the new state change
        if ( pGapRoles_AppCGs && pGapRoles_AppCGs->pfnStateChange )
        {
          pGapRoles_AppCGs->pfnStateChange( gapRole_state );
        }
      }
    }
    return ( events ^ START_ADVERTISING_EVT );
}
.............................................................
}

这里给params结构体赋值，包括了广播类型，广播通道等等！

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