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dma: support source/destination address auto step

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Signed-off-by: xucheng5 <xucheng5@xiaomi.com>
This commit is contained in:
xucheng5 2023-09-15 16:45:21 +08:00 committed by Xiang Xiao
parent f99b1a41a3
commit 366628bf5a
1 changed files with 8 additions and 0 deletions
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8
include/nuttx/dma/dma.h
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@ -229,12 +229,17 @@ typedef CODE void (*dma_callback_t)(FAR struct dma_chan_s *chan,
* direction - whether the data shall go in or out on this channel.
* priority - the bus priority compare with other active channel.
* timeout - abort if the source can't prepare data within this value.
* option - used to configuration for this dma channel which is optional
* dst_width - this is the width in bytes of destination target(TX) register
* where DMA data shall be read. If the source is memory this
* may be ignored. Legal values: 1, 2, 4, 8.
* src_width - same as dst_width but for the source(RX) mutatis mutandis.
* dst_drq - physical destination DMA request ID for this channel.
* src_drq - physical source DMA request ID for this channel.
* dst_step - after each DMA transfer, destination addr should increase
* dst_step (> 0) or decrease dst_step (< 0)
* src_step - after each DMA transfer, source addr should increase
* dst_step (> 0) or decrease dst_step (< 0)
*
* Note: the special value zero means to keep the current value without
* change.
@ -246,10 +251,13 @@ struct dma_config_s
unsigned int direction;
unsigned int priority;
unsigned int timeout;
unsigned int option;
unsigned int dst_width;
unsigned int src_width;
unsigned int dst_drq;
unsigned int src_drq;
int dst_step;
int src_step;
};
#ifdef CONFIG_DMA_LINK