dma_config Struct Reference

dma_config specifies the DMA channel parameters for data transfer, such as transfer source, transfer destination and transfer count. More...

#include <mhal_dma.h>

Data Fields
u32	addr_1
	For FULL-SIZE DMA, addr_1 is src_addr. More...
u32	addr_2
	For FULL-SIZE DMA, addr_2 is dst_addr. More...
u32	wrap_point
	Wrap point from start address. More...
u32	wrap_to_addr
	The address which DMA will wrap to. More...
u8	reload_en
	Reload transfer count flag, only for HALF-SIZE DMA.
u32	count
	For FULL-SIZE DMA and HALF-SIZE DMA, it specifies transfer byte count. More...
u8	bw_limiter
	Bandwidth limiter. More...
u8	alert_cmp_type
	Specifies the Compare Equation Between ALTLEN and FIFO_SIZE - FIFO_CNT.
u32	alert_len
	Specifies the Alert Length of Virtual FIFO DMA.
u32	fifo_size
	Virtual fifo size, only for VFF DMA.
u32	timeout_cnt
	Interrupt will assert if there is no new data into FIFO more than n T(Bus Clock)
dma_isr_callback	isr_callback_1
	For FULL-SIZE DMA and HALF-SIZE DMA, isr_callback_1 is completion isr callback. More...
dma_isr_callback	isr_callback_2
	For HALF-SIZE DMA, isr_callback_2 is half completion isr callback. More...
void *	isr_cb_data_1
	isr_callback_1 data
void *	isr_cb_data_2
	isr_callback_2 data

Detailed Description

dma_config specifies the DMA channel parameters for data transfer, such as transfer source, transfer destination and transfer count.

Users fill the field of dma_config according to the DMA channel type.

Field Documentation

u32 addr_1

For FULL-SIZE DMA, addr_1 is src_addr.

For HALF-SIZE DMA and VFF DMA, addr_1 is prog_addr.

u32 addr_2

For FULL-SIZE DMA, addr_2 is dst_addr.

For HALF-SIZE DMA and VFF DMA, addr_2 is fix_addr.

u32 wrap_point

Wrap point from start address.

If wrap_en in dma_ctrl is enable, DMA channel read/write pointer will jump to wrap_to_addr at wrap_point during data transfer.
Only for FULL-SIZE DMA and HALF-SIZE DMA.

u32 wrap_to_addr

The address which DMA will wrap to.

If wrap_en in dma_ctrl is enable, DMA channel read/write pointer will jump to wrap_to_addr at wrap_point during data transfer.
Only for FULL-SIZE DMA and HALF-SIZE DMA.

u32 count

For FULL-SIZE DMA and HALF-SIZE DMA, it specifies transfer byte count.

FOR VFF DMA, it specifies the threshold for FIFO data interrupt.

u8 bw_limiter

Bandwidth limiter.

The value range is from 0 to 255.

dma_isr_callback isr_callback_1

For FULL-SIZE DMA and HALF-SIZE DMA, isr_callback_1 is completion isr callback.

For VFF DMA, isr_callback_1 is FIFO data underflow or overflow interrupt callback.

dma_isr_callback isr_callback_2

For HALF-SIZE DMA, isr_callback_2 is half completion isr callback.

For VFF DMA, isr_callback_2 is FIFO DMA timeout interrupt callback.

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

• mhal_dma.h