MMI_TASK相关

/*****************************************************************************
 * FUNCTION
 *  mmi_frm_fetch_msg_from_extQ_to_circularQ
 * DESCRIPTION
 *  fetch the message from external queue and put
 *  in the circular queue.
 *  (*) Need to set my_index & mmi_ext_qid before using
 *  this function
 * PARAMETERS
 *  void
 * RETURNS
 *  1 - the message is invalid, and discard the message
 *  0 - the message is valid

*****************************************************************************/

由这个函数注释我们可以知道，有两个队列，一个是外部队列，一个是循环队列

 

查看公司提供的文档了解是有三种队列：

 

nExternal queue(Inter-task queue, mod to mod(In the diff task))

nReseive message:               OslReceiveMsgExtQ(receive_msg_ext_q)

n

Send message:                     OslMsgSendExtQueue(msg_send_ext_queue)

 

nInternal queue(Intra-task queue, mod to mod(In the same task))

nReseive message: receive_msg_int_q

n

n

nCircular queue(MMI only, default size 30)

nReseive message (From MMI Task): OslReadCircularQ

nSend message (For NVRAM Access): OslWriteCircularQ

n

Send message: msg_send_int_queue

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n如何向L4层发消息:

nStep1: Construct a local parameter buffer.

nStep2: Assign required values into local parameter buffer.

nStep3: Send out the message to  the L4C module.

n

 

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MMI_TASK函数结尾处有这样的代码：

 

default:
                                ProtocolEventHandler(
                                    (U16) Message.oslMsgId,
                                    (void*)Message.oslDataPtr,
                                    (int)Message.oslSrcId,
                                    (void*)&Message);
                                break;

 

也就是从外部队列里取出的消息除了特殊的消息，其他的默认的消息就放在这里面执行了。

OslMsgSendExtQueue(&Message);

n

nInternal queue(Intra-task queue, mod to mod(In the same task))

nReseive message:                      receive_msg_int_q

nSend message:                         msg_send_int_queue

n

nCircular queue(MMI only, default size 30)

nReseive message (From MMI Task):         OslReadCircularQ

nSend message (For NVRAM Access):        OslWriteCircularQ

n

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