VSOS底层操作系统指引.pdf

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1、PUBLICDOCUMENTVS1005VSOSPROGRAMMER’SGUIDEVS1005gAllinformationinthisdocumentisprovidedas-iswithoutwarranty.Featuresaresubjecttochangewithoutnotice.RevisionHistoryRev.DateAuthorDescription0.22.02012-11-15HH&PKPInitialreleaseforVSOSv0.22.Rev.0.22.02012-11-15Page1(

2、67)VS1005VSOSPROGRAMMER’SGUIDEVS1005gHH,PkPContentsVS1005VSOSProgrammer’sGuideFrontPage1TableofContents21Introduction52Disclaimer63Definitions64VSOSOverview75VSOSFundamentals95.1Files.......................................95.2FileI/O..............................

3、.......95.3VSDSPSpecificFileI/OBehaviour......................105.4StandardInputandOutput..........................105.5Devices.....................................115.6Filesystems...................................115.7DisplaysandInputDevices....................

4、......126UserInterfaceMessages137VSOSTemplatesinVSIDE177.1Hello,World...................................177.2AudioIn,AudioOut...............................207.3StandardButtons................................227.4VSOSMainMenu...............................277.5U

5、serInterfaceKernelModule.........................297.6SimpleMP3Player...............................307.7SimpleMP3PlayerwithThreads.......................327.8MP3PlayerusingUserInterfaceKernelModule...............337.8.1TheMP3DecoderModelmp3model.c..............

6、..348TheVSOSAPIReference368.1APIFunctionCallsandsystemvariables...................368.2VS1005LowLevelCalls............................409VS_DSP4Architecture439.1VS_DSP4MemoryTypes...........................439.2BasicVS_DSP4Datatypes..........................439.

7、3VS_DSP4,VS1005gandVSIDEIdiosyncrasies...............449.3.1No8-bitDataTypesorByteAddressing...............449.3.2NoLargeStackMemoryAllocations.................449.3.3UsingStandardInput/OutputontheVS1005DevelopmentBoard.4510Audio4610.1StandardAudio..............

8、...................46Rev.0.22.02012-11-15Page2(67)VS1005VSOSPROGRAMMER’SGUIDEVS1005gHH,PkP10.2SimpleAudioExampleProgram.......................4710.3AudioInput........