dma_silabs_ldma.h File Reference

#include <zephyr/drivers/dma.h>

Go to the source code of this file.

Macros
#define	SILABS_LDMA_SOURCE_MASK   GENMASK(21, 16)
#define	SILABS_LDMA_SIG_MASK   GENMASK(3, 0)
#define	SILABS_DMA_SLOT_SOURCE_MASK   GENMASK(7, 3)
#define	SILABS_DMA_SLOT_SIG_MASK   GENMASK(2, 0)
#define	SILABS_LDMA_REQSEL_TO_SLOT(signal)
#define	SILABS_LDMA_SLOT_TO_REQSEL(slot)

Functions
int	silabs_ldma_append_block (const struct device *dev, uint32_t channel, struct dma_config *config)
	Append a new block to the current channel.

Macro Definition Documentation

SILABS_DMA_SLOT_SIG_MASK

#define SILABS_DMA_SLOT_SIG_MASK   GENMASK(2, 0)

SILABS_DMA_SLOT_SOURCE_MASK

#define SILABS_DMA_SLOT_SOURCE_MASK   GENMASK(7, 3)

SILABS_LDMA_REQSEL_TO_SLOT

#define SILABS_LDMA_REQSEL_TO_SLOT

(

signal

)

Value:

        FIELD_PREP(SILABS_DMA_SLOT_SOURCE_MASK, FIELD_GET(SILABS_LDMA_SOURCE_MASK, signal)) | \
        FIELD_PREP(SILABS_DMA_SLOT_SIG_MASK, FIELD_GET(SILABS_LDMA_SIG_MASK, signal))

SILABS_LDMA_SIG_MASK

#define SILABS_LDMA_SIG_MASK   GENMASK(3, 0)

SILABS_LDMA_SLOT_TO_REQSEL

#define SILABS_LDMA_SLOT_TO_REQSEL

(

slot

)

Value:

        FIELD_PREP(SILABS_LDMA_SOURCE_MASK, FIELD_GET(SILABS_DMA_SLOT_SOURCE_MASK, slot)) | \
        FIELD_PREP(SILABS_LDMA_SIG_MASK, FIELD_GET(SILABS_DMA_SLOT_SIG_MASK, slot))

SILABS_LDMA_SOURCE_MASK

#define SILABS_LDMA_SOURCE_MASK   GENMASK(21, 16)

Function Documentation

silabs_ldma_append_block()

int silabs_ldma_append_block	(	const struct device *	dev,
		uint32_t	channel,
		struct dma_config *	config
	)

Append a new block to the current channel.

This function allows to append a block to the current DMA transfer. It allows a user/driver to register the next DMA transfer while a transfer in being held without stopping or restarting DMA engine. It is very suitable for Zephyr Uart API where user gives buffers while the DMA engine is running. Because this function changes dynamically the link to the block that DMA engine would load as the next transfer, it is only working with channel that didn't have linked block list.

In the case that the DMA engine naturally stopped because the previous transfer is finished, this function simply restart the DMA engine with the given block. If the DMA engine stopped while reconfiguring the next transfer, the DMA engine will restart too.

Parameters

dev	dma device
channel	channel
config	configuration of the channel with the block to append as the head_block.