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1、nios ii常用函数整理（Nios II commonly used function arrangement）NIOS II commonly used function arrangement2009-10-28 09:49:02|: Nios II | subscription name classificationIO operation functionPrototype of function: IORD (BASE, REGNUM)Input parameters: BASE base address register, REGNUM offset registerFuncti
2、on Description: from the base address for the BASE device reads the REGNUM offset register unit inside value. The register value within the scope of the address bus.Return value: -Prototype of function: IOWR (BASE, REGNUM, DATA)Input parameters: BASE base address register, REGNUM offset register, DA
3、TA data to be writtenFunction Description: to offset write data in the REGNUM register. The register value within the scope of the address bus.Return value: -Prototype of function: IORD_32DIRECT (BASE, OFFSET)Input parameters: BASE base address register, the register offset for OFFSETFunction Descri
4、ption: from the address position is directly read 32Bit BASE+OFFSET data in the registerReturn value: -Prototype of function: IORD_16DIRECT (BASE, OFFSET)Input parameters: BASE base address register, the register offset for OFFSETFunction Description: from the address position is directly read 16Bit
5、 BASE+OFFSET data in the registerReturn value: -Prototype of function: IORD_8DIRECT (BASE, OFFSET)Input parameters: BASE base address register, the register offset for OFFSETFunction Description: from the address position is directly read 8Bit BASE+OFFSET data in the registerReturn value: -The funct
6、ion prototype: IOWR_32DIRECT (BASE, OFFSET, DATA)Input parameters: BASE base address register, REGNUM offset register, DATA data to be writtenFunction Description: to address location directly into the 32Bit BASE+OFFSET register dataReturn value: -The function prototype: IOWR_16DIRECT (BASE, OFFSET,
7、 DATA)Input parameters: BASE base address register, REGNUM offset register, DATA data to be writtenFunction Description: to address location directly into the 16Bit BASE+OFFSET register dataReturn value: -The function prototype: IOWR_8DIRECT (BASE, OFFSET, DATA)Input parameters: BASE base address re
8、gister, REGNUM offset register, DATA data to be writtenFunction Description: to address location directly into the 8Bit BASE+OFFSET register dataReturn value: -Dma:The function prototype: int alt_dma_rxchan_close (alt_dma_rxchan rxchan)Input parameter: rxchan is the receive channelFunction: function
9、 (alt_dma_rxchan_close) notification system: application has been completed DMAThe receiving channel rxchan, the current implementation is successfulReturns: 0, and 1The function prototype: alt_dma_rxchan_depth (alt_dma_rxchan DMA)Input parameter: DMAFunction: function alt_dma_rxchan_depth () return
10、s the maximum number of transmitted to the special DMA (depth) of the received requestReturn value: the maximum number of DMAThe function prototype: int alt_dma_rxchan_ioctl (alt_dma_rxchan DMA, int req, void* ARG)Input parameters: DMA direct memory, req lists the requested operation, Arg decided by
11、 the requestFunction Description: received through the DMA channel to perform equipment specific I/O operationReturns: request specific value, otherwise return is negativeRequest typeRequest type request specificationTransmission of ALT_DMA_SET_MODE_8 data in 8Bit Arg ignoreTransmission of ALT_DMA_S
12、ET_MODE_16 data in 16Bit Arg ignoreTransmission of ALT_DMA_SET_MODE_32 data in 32Bit Arg ignoreTransmission of ALT_DMA_SET_MODE_64 data in 64Bit Arg ignoreTransmission of ALT_DMA_SET_MODE_128 data in 128Bit Arg ignoreALT_DMA_TX_ONLY_ON (1) under the control of software can only sendALT_DMA_TX_ONLY_O
13、FF (1) custom mode, under the control of software can receive, sendALT_DMA_RX_ONLY_ON (1) under the control of software can only receiveALT_DMA_RX_ONLY_OFF (1) custom mode, under the control of software can receive, sendThe function prototype: alt_dma_rxchan alt_dma_rxchan_open (const char* name)Inp
14、ut parameters: name constant character pointer, such as /dev/dma_0Function Description: get a alt_dma_rxchan descriptor for the DMA receiving channelReturns: 0, and returns to 0The function prototype: int alt_dma_rxchan_prepare (alt_dma_rxchan DMA, void* data,Alt_u32 length, alt_rxchan_done * done,
15、void* handle)Input parameters: DMA use channel; data receive data position pointer; length maximum receive data length; done once data is received, call the return function; handle, non transparent value to doneFunction Description: Send a request to the DMA receiver receiving channel,Returns: 0, whereas the return is negativeThe function prototype: int alt_dma_rxchan_reg (alt_dma_rxchan_dev * DEV)Input parameter: dev receive channel device nameFunction Description: system to register DMA receiving channel
