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1、niosii常用函数详解（Childrenii常用函数详解）NIOSIIcommonlyusedfunctionsdetailedIOoperationfunctionFunctionprototype:IORD(BASE,REGNUM)Inputparameter:BASEisthebaseaddressoftheregister,andREGNUMistheoffsetoftheregisterFunctionDescription:thevalueoftheunitintheregisteroffsetREGNUMisreadfromthedevicewhosebaseaddre
2、ssisBASE.Thevalueoftheregisteriswithintherangeoftheaddressbus.Returnvalue:-Functionprototype:IOWR(BASE,REGNUM,DATA)Inputparameter:BASEisthebaseaddressoftheregister,REGNUMistheoffsetoftheregister,andDATAisthedatatobewrittenFunctionDescription:writesdatatotheoffsetregisterforoffsetREGNUM.Thevalueo
3、ftheregisteriswithintherangeoftheaddressbus.Returnvalue:-Functionprototype:IORD_32DIRECT(BASE,OFFSET)Inputparameter:BASEisthebaseaddressoftheregister,andOFFSETistheoffsetoftheregisterFunctionDescription:readthedataof32BitdirectlyfromtheregisterwithaddresslocationofBASE+OFFSETReturnvalue:-Functio
4、nprototype:IORD_16DIRECT(BASE,OFFSET)Inputparameter:BASEisthebaseaddressoftheregister,andOFFSETistheoffsetoftheregisterFunctionDescription:readthedataof16BitdirectlyfromtheregisterwithaddresslocationofBASE+OFFSETReturnvalue:-Functionprototype:IORD_8DIRECT(BASE,OFFSET)Inputparameter:BASEisthebase
5、addressoftheregister,andOFFSETistheoffsetoftheregisterFunctionDescription:readthedataof8BitdirectlyfromtheregisterwithaddresslocationofBASE+OFFSETReturnvalue:-Functionprototype:IOWR_32DIRECT(BASE,OFFSET,DATA)Inputparameter:BASEisthebaseaddressoftheregister,REGNUMistheoffsetoftheregister,andDATAi
6、sthedatatobewrittenFunctionDescription:writesdatadirectlytothe32BitinregisterslocatedataddresslocationsofBASE+OFFSETReturnvalue:-Functionprototype:IOWR_16DIRECT(BASE,OFFSET,DATA)Inputparameter:BASEisthebaseaddressoftheregister,REGNUMistheoffsetoftheregister,andDATAisthedatatobewrittenFunctionDes
7、cription:writesdatadirectlytothe16BitinregisterslocatedataddresslocationsofBASE+OFFSETReturnvalue:-Functionprototype:IOWR_8DIRECT(BASE,OFFSET,DATA)Inputparameter:BASEisthebaseaddressoftheregister,REGNUMistheoffsetoftheregist
