nucseries how to use pdma transfer data sc rev在NUC1xx中如何用PDMA傳輸數(shù)據(jù)

ApplicationNoteofNUVOTON32-bitNuMicro?Application32-bitCortex?-M0MCUNuMicro?Family March11,-i Rev.簡 目標讀 背景知 限 代碼片 PDMA傳輸流程(見 調(diào)用過 API用法參 測試 結(jié) 版本歷 本文利用AN_1016_EN.ZIP“Smpl_DrvPDMA”項目，闡述了用PDMA在內(nèi)存和UART串行NUC1xx’sPDMA是用于直接內(nèi)存的控制器，它可以用來在內(nèi)存之間或內(nèi)存/APB(AdvancedPeripheralBus)之間傳輸數(shù)據(jù)。該控制器一共有9路DMA,工作方式可以設(shè)定為設(shè)備到內(nèi)存、內(nèi)存到全局變量SrcArray用來存放預(yù)定要發(fā)送的數(shù)據(jù)，這些數(shù)據(jù)將傳輸?shù)経ARTTransmitHolding全局變量DestArray用來存放接受到的數(shù)據(jù)，這些數(shù)據(jù)將從UARTReceiveBufferUA_RBR寄存器中接uint8_tSrcArray[UART_TEST_LENGTH]; volatileint32_t在下面的代碼里，打開第一個UART(UART_PORT0)，將用來在控制臺上輸入輸出信息；打開第二個UART端口(UART_PORT1)，將被PDMA用來和內(nèi)存之間傳輸數(shù)據(jù)。/*SetUARTPin*//*SetUARTPin*//*UARTSetting*/ =DRVUART_DATABITS_8; =DRVUART_STOPBITS_1; sParam.u8cRxTriggerLevel=DRVUART_FIFO_1BYTES;/*SetUARTConfiguration*/() ()UARTPort=UART1_BASE;/*PDMAInit*//*PDMASetting/*/*CH1TXSetting = = = = =eDRVPDMA_DIRECTION_FIXED; =/*/*CH0RXSetting =UARTPort; =(uint32_t)DestArray; = /*/*EnableINTDrvPDMA_EnableInt(eDRVPDMA_CHANNEL_0,eDRVPDMA_BLKD);DrvPDMA_EnableInt(eDRVPDMA_CHANNEL_1,eDRVPDMA_BLKD);/*InstallCallbackfunction*/啟動PDMA模式。對于內(nèi)存到內(nèi)存的PDMA,DrvUART_SetPDMA()。/*/*EnableUARTPDMAandTriggerPDMAspecifiedChannel*/()當(dāng)A的通道0一次傳輸結(jié)束，就會觸發(fā)中斷處理函數(shù)A()。如下面的代碼所示，中斷處理函數(shù)再次啟動了新一輪的PMA傳輸。當(dāng)總共傳輸次數(shù)到達0次時，標記IsTtOvr會被射成Texternextern {}{IsTestOver=}InitInitPreparePDMAOpenInitPDMATriggerPDMAchannel1OpenSetchannelTriggerPDMAchannel0Setchannel打開兩個UART設(shè)備：UART0 t)加您可以用KeilMDK編譯并運行該PDMA示例代碼(Smpl_DrvPDMA)。在KeilMDK下運行的時候，需要一塊NUC1xx系列開發(fā)板和一個ICE。.如果程序已經(jīng)燒錄在Flash中了，用戶重啟動開發(fā)板后，也程序運行的時候，SrcArray中的源數(shù)據(jù)將被寫到UART1TransmitHolding寄存器中；UART1ReceiveBuffer寄存器中的數(shù)據(jù)，將被寫到目標數(shù)據(jù)DestArray中。通過這種方式，SrcArray中的數(shù)據(jù)會被到March11,1.InitiallyImportantNuvotonproductsarenotdesigned,intended,authorizedorwarrantedforuseascomponentsinsystemsorequipmentintendedforsurgicalimntation,atomicenergycontrolinstruments,airneorspaceshipinstruments,transportationinstruments,trafficsignalinstruments,combustioncontrolinstruments,orforotherapplicationsintendedtosupportorsustainlife.Furthermore,NuvotonproductsarenotintendedforapplicationswhereinfailureofNuvotonproductscouldresultorleadtoasituationwherein alinjury,deathorseverepropertyorenvironmentaldamagecouldoccur.NuvotoncustomersusingorsellingtheseproductsforuseinsuchapplicationsdosoattheirownriskandagreetofullyindemnifyNuvotonforanydamagesresultingfromsuchimproperuseorsales.Pleasenotethatalldataandspeci