dma.h File Reference

DMA. More...

#include <stdint.h>

Enumerations
enum	BurstMode { }
	DMA burst mode (RAM->RAM only). More...
enum	Peripheral
	MMSP2 peripherals available for DMA transfers.

Functions
void	dmaConfigureChannelIO (int channel, BurstMode burstMode, int8_t srcIncrement, int8_t destIncrement, Peripheral peripheral)
	Configure a DMA channel for memory-to-peripheral transfer. More...
void	dmaConfigureChannelMem (int channel, BurstMode burstMode, int8_t srcIncrement, int8_t destIncrement)
	Configure a DMA channel for memory-to-memory transfer. More...
bool	dmaHasFinished (int channel)
	Check if a DMA channel has finished transferring data. More...
bool	dmaIsTransferring (int channel)
	Check if a DMA channel is transferring data. More...
void	dmaStart (int channel, uint16_t length, uint32_t src, uint32_t dest)
	Initiate a DMA transfer. More...
void	dmaStop (int channel)
	Stop a DMA transfer. More...

Enumeration Type Documentation

BurstMode

enum BurstMode

Enumerator
WORDS_4	Copy one word at a time.

Function Documentation

dmaConfigureChannelIO()

void dmaConfigureChannelIO	(	int	channel,
		BurstMode	burstMode,
		int8_t	srcIncrement,
		int8_t	destIncrement,
		Peripheral	peripheral
	)

Configure a DMA channel for memory-to-peripheral transfer.

Parameters

channel	DMA channel to configure (0 - 15)
burstMode	Number of words to copy at a time
srcIncrement	Number of words to increment source address after each transfer (negative values and zero are permitted)
destIncrement	Number of words to increment destination address after each transfer (negative values and zero are permitted)
peripheral	MMSP2 peripheral to write to

dmaConfigureChannelMem()

void dmaConfigureChannelMem	(	int	channel,
		BurstMode	burstMode,
		int8_t	srcIncrement,
		int8_t	destIncrement
	)

Configure a DMA channel for memory-to-memory transfer.

Parameters

channel	DMA channel to configure (0 - 15)
burstMode	Number of words to copy at a time
srcIncrement	Number of words to increment source address after each transfer (negative values and zero are permitted)
destIncrement	Number of words to increment destination address after each transfer (negative values and zero are permitted)

dmaHasFinished()

bool dmaHasFinished

(

int

channel

)

Check if a DMA channel has finished transferring data.

Parameters

channel

DMA channel to check (0 - 15)

dmaIsTransferring()

bool dmaIsTransferring

(

int

channel

)

Check if a DMA channel is transferring data.

Parameters

channel

DMA channel to check (0 - 15)

dmaStart()

void dmaStart	(	int	channel,
		uint16_t	length,
		uint32_t	src,
		uint32_t	dest
	)

Initiate a DMA transfer on a previously configured channel.

Parameters

channel	DMA channel to initiate transfer on (0 - 15)
length	Number of bytes to transfer (maximum 64K)
src	Source address (aligned to 4 byte word boundary)
dst	Destination address (aligned to 4 byte word boundary)

See also

dmaConfigureChanelMem

dmaStop()

void dmaStop

(

int

channel

)

Stop a DMA transfer.

Parameters

channel

DMA channel to stop (0 - 15)