DMA_Init_TypeDef Struct Reference
[DMA]

#include <em_dma.h>

Collaboration diagram for DMA_Init_TypeDef:
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Data Fields

uint8_t hprot
DMA_DESCRIPTOR_TypeDef * controlBlock

Detailed Description

DMA init structure

Definition at line 327 of file em_dma.h.


Field Documentation

DMA_DESCRIPTOR_TypeDef* DMA_Init_TypeDef::controlBlock

Pointer to the controlblock in memory holding descriptors (channel control data structures). This memory must be properly aligned at a 256 bytes. I.e. the 8 least significant bits must be zero.

Please refer to the reference manual, DMA chapter for more details.

It is possible to provide a smaller memory block, only covering those channels actually used, if not all available channels are used. Ie, if only using 4 channels (0-3), both primary and alternate structures, then only 16*2*4 = 128 bytes must be provided. This implementation has however no check if later exceeding such a limit by configuring for instance channel 4, in which case memory overwrite of some other data will occur.

Definition at line 354 of file em_dma.h.

Referenced by DMA_Init().

HPROT signal state when accessing the primary/alternate descriptors. Normally set to 0 if protection is not an issue. The following bits are available:

  • bit 0 - HPROT[1] control for descriptor accesses (ie when the DMA controller accesses the channel control block itself), privileged/non-privileged access

Definition at line 337 of file em_dma.h.

Referenced by DMA_Init().


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