Siemens 7 manual Buffer Handling

Multiplexer Driver Developer’s Guide

7.3 Buffer Handling

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7.3Buffer Handling

SerMux

SerPortN Mulitplexer Control Port 0

Channel number
	Send	RCV
Priority with MaxSequence
Timeouts (Request Timeouts and	Queue	Queue
Scanning Timeouts)	Requests	Requests
Statistics
V24 Status from itself and the
Modem	Circular	Circular
Handshake Status
Current Read and Write Status	buffer	buffer
Circular Buffer Params	Send	RCV
ScanSendRequest

SerPort 0

Special control functions:

EstablishDLC

ReleaseDLC

CloseDown

SetModemStatus

SendVersionCommand

ConfirmCommand

Buffer

Circular

buffer

Send

CommandBuffer

GetFrameBufferPort0()

if receive a Control Command

SerPort0IndicateFrame()

Timer functions:

WrTimer()

OnTimerSerPort0()

OnTimerSerPort()

Control Timeouts for Send and Receive Queue Requests for repeating Control Commands and Timeouts for scanning the Escape Sequence

Send function:

while(GetWriteBuffer) { SerPort=GetNextSerPort(); SerPort->GetFrame(); SubmitWriteBuffer();

}

Frame Assembly and check

state machine Demux

IndicateRead {

ProcessData(); // check frame, crc SerPortIndicateFrame()

//indicate frame to a SerPort instance

}

WrGetWriteBuffer(void *Buffer,ULONG &Length);	void WrIndicateReadBuffer(void *Buffer,ULONG Length);
WrSubmitWriteBuffer(void *Buffer,ULONG
Length);
WrWriteComplete();
WrReturnWriteBuffer();
Write Buffer	Read Buffer
Pool	Pool

Wrapper

Figure 5: Driver internal buffer handling

Mux_Drv_DevGuide_v07	Page 29 of 36	2006-9-27
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