General Purpose DMA

Enumerations
enum	rflpc_dma_channel_t {   RFLPC_DMAC0,   RFLPC_DMAC1,   RFLPC_DMAC2,   RFLPC_DMAC3,   RFLPC_DMAC4,   RFLPC_DMAC5,   RFLPC_DMAC6,   RFLPC_DMAC7 }
	Enum to identify DMA channels.

Functions
void	rflpc_dma_init (void)
	Inits the DMA Peripheral. More...
int	rflpc_dma_channel_ready (rflpc_dma_channel_t channel)
	Tells if a DMA channel is ready to be used. More...
int	rflpc_dma_start (rflpc_dma_channel_t channel, void *dest, const void *src, uint32_t size)
	Starts a DMA copy. More...

Detailed Description

Function Documentation

int rflpc_dma_channel_ready

(

rflpc_dma_channel_t

channel

)

Tells if a DMA channel is ready to be used.

Returns

true if the DMA channel is ready (not already doing something)

void rflpc_dma_init

(

void

)

Inits the DMA Peripheral.

Note

The DMA is enabled in little endian mode by default

int rflpc_dma_start	(	rflpc_dma_channel_t	channel,
		void *	dest,
		const void *	src,
		uint32_t	size
	)

Starts a DMA copy.

The DMA channel must be ready before starting a DMA copy

Parameters

channel	The channel to use.
dest	destination pointer
src	source data
size	number of bytes to transfert (limited to 0xFFF bytes)

Returns

true if the copy has been started, false otherwise

Warning

In the current implementation, size is limited by 0xFFF because only one DMA request is generated.

Todo:

Handle size > 0xFFF