SPITivaDMA_HWAttrs Struct Reference

SPITivaDMA Hardware attributes. More...

#include <SPITivaDMA.h>

Data Fields
SPIBaseAddrType	baseAddr
unsigned int	intNum
uint32_t	intPriority
uint32_t *	scratchBufPtr
uint32_t	defaultTxBufValue
uint32_t	rxChannelIndex
uint32_t	txChannelIndex
void(*	channelMappingFxn )(SPIDataType)
uint32_t	rxChannelMappingFxnArg
uint32_t	txChannelMappingFxnArg

Detailed Description

SPITivaDMA Hardware attributes.

These fields are used by driverlib APIs and therefore must be populated by driverlib macro definitions. For TivaWare these definitions are found in:

• inc/hw_memmap.h
• inc/hw_ints.h
• driverlib/udma.h

A sample structure is shown below:

uint32_t spiTivaDMAscratchBuf;
const SPITivaDMA_HWAttrs spiTivaDMAobjects[] = {
    {
        .baseAddr = SSI0_BASE,
        .intNum = INT_SSI0,
        .intPriority = (~0),
        .scratchBufPtr = &spiTivaDMAscratchBuf,
        .defaultTxBufValue = 0,
        .rxChannelIndex = UDMA_CHANNEL_SSI0RX,
        .txChannelIndex = UDMA_CHANNEL_SSI0TX,
        .channelMappingFxn = uDMAChannelAssign,
        .rxChannelMappingFxnArg = UDMA_CH10_SSI0RX,
        .txChannelMappingFxnArg = UDMA_CH11_SSI0TX
    },
};

Field Documentation

SPIBaseAddrType SPITivaDMA_HWAttrs::baseAddr

SSI Peripheral's base address

unsigned int SPITivaDMA_HWAttrs::intNum

SSI TivaDMA Peripheral's interrupt vector

uint32_t SPITivaDMA_HWAttrs::intPriority

SPITivaDMA Peripheral's interrupt priority

uint32_t* SPITivaDMA_HWAttrs::scratchBufPtr

Address of a scratch buffer of size uint32_t

uint32_t SPITivaDMA_HWAttrs::defaultTxBufValue

Default TX value if txBuf == NULL

uint32_t SPITivaDMA_HWAttrs::rxChannelIndex

uDMA controlTable channel index

uint32_t SPITivaDMA_HWAttrs::txChannelIndex

uDMA controlTable channel index

void(* SPITivaDMA_HWAttrs::channelMappingFxn) (SPIDataType)

uDMA mapping function that maps the SPI trigger to the DMA channel

uint32_t SPITivaDMA_HWAttrs::rxChannelMappingFxnArg

uDMA MappingFxn arg to map the Tx channel

uint32_t SPITivaDMA_HWAttrs::txChannelMappingFxnArg

uDMA MappingFxn arg to map the Rx channel

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The documentation for this struct was generated from the following file:

• SPITivaDMA.h