mtk SMS架构

2.指派必需的值给局部参数
Step2: Assign required values into local parameter buffer.
3.发送这些值到L4C层
Step3: Send out the message to the L4C module.
怎样从L4C层接收一个消息
(How to receive a message from L4C)
Inter-task queue The inter-task queue is used to communicate with other tasks. Task can receive all message from others. Especial, the task which are waiting for the event can suspend itself. It is a very important feature because CPU can served to other tasks when current task is waiting for something. Send and receive queue services provide options for unconditional suspension, suspension with a timeout, and no suspension. Tasks may suspend on a queue for several reasons. A task attempting to receive a message from an empty queue can suspend. Additionally, a task attempting to send a message to a full queue can suspend. A suspended task is resumed when the queue is able to satisfy that task’s request.
谢谢

注册一个响应消息的callback函数
(Register a response message callback.)
Ex: SetProtocolEventHandler(PsFuncPtr funcPtr, U16 eventID)
Message Information: Header info + Data info Ex: typedef struct { LOCAL_PARA_HDR kal_uint8 volume_type; /*volume_type_enum */ kal_uint8 volume_level; } mmi_eq_set_volume_req_struct;;
Message Information: Header info + Data info Ex: typedefstruct{ PEER_BUFF_HDR void *ptr; } mmi_example;
How To Create Peer Buffer Parameter:
Dynamic to allocate memory buffer:
Receives events from all tasks Queue is designed for Inter-process Communication. Queues provide a mechanism to transmit multiple messages. Messages are sent and received by value. A send-message request copies the message into the queue, while a receive-message request copies the message out of the queue. Messages may be placed at the front of the queue or at the back of the queue. Each task can send a event to another one. Normally the event is transferred by Operation System, so OS provides the functions to user. The destination task can call receive function to get the event. Our system provide two different communication mode, one is for inter-taskthe other is for intra-task.
Ps: The MMI did not use this buffer to communicate with L4.
When will Free Peer Buffer:
While L4 receive the information, after finishing to process the message, L4 task will automatically free this buffer.
(When to Free Local Parameter)
当L4层接收到信息并完成处理过程后会自动释放该局部参数
(While L4 receive the information, after finishing to process the message, L4 task will automatically free this buffer)
创建一个局部参数
(How To Create Local Parameter)
动态分配内存buffer 动态分配内存
(Dynamic to allocate memory buffer)
EX: OslIntConstructDataPtr(U32 size) Function.
什么时候释放这个局部参数
oslModuleType oslSrcId; oslModuleType oslDestId; oslMsgType oslMsgType oslParaType oslSapId; oslMsgId; *oslDataPtr; // Source module iD. 发送模块ID // Destination module ID. 目标模块ID // service access point. 服务通道点 // message name ID. 消息ID //local parameter buffer 局部参数缓存 //peer buffer pointer
消
息
Message ID
手机内部之间怎样通讯?
How To Communicate?
通过消息队列发送/接收消息
Send/Receive Messages Thru The Message Queue
传送的数据有些什么?
Communication Data
typedefstructilm_struct {
Ex: OslIntReceiveMsgExtQ(oslMsgqid msgqid, MYQUEUE *Message)
怎样发送一个消息到L4C层
(How to send a message to L4C)
1.创建一个局部参数
Step1: Construct a local parameter buffer.
oslPeerParaPtr *oslPeerBuffPtr; } ilm_struct;
怎样从MMI的消息队列中获取一个消息
(How to listen a message from MMI Queue)
从Task中创建并进入一个消息循环
(From task create and entry a message loop.)