Initialization and Configuration functions. More...

Collaboration diagram for Initialization and Configuration functions:

Functions
void	DMA_DeInit (DMA_Stream_TypeDef *DMAy_Streamx)
	Deinitialize the DMAy Streamx registers to their default reset values. More...

void	DMA_Init (DMA_Stream_TypeDef DMAy_Streamx, DMA_InitTypeDef DMA_InitStruct)
	Initializes the DMAy Streamx according to the specified parameters in the DMA_InitStruct structure. More...

void	DMA_StructInit (DMA_InitTypeDef *DMA_InitStruct)
	Fills each DMA_InitStruct member with its default value. More...

void	DMA_Cmd (DMA_Stream_TypeDef *DMAy_Streamx, FunctionalState NewState)
	Enables or disables the specified DMAy Streamx. More...

void	DMA_PeriphIncOffsetSizeConfig (DMA_Stream_TypeDef *DMAy_Streamx, uint32_t DMA_Pincos)
	Configures, when the PINC (Peripheral Increment address mode) bit is set, if the peripheral address should be incremented with the data size (configured with PSIZE bits) or by a fixed offset equal to 4 (32-bit aligned addresses). More...

void	DMA_FlowControllerConfig (DMA_Stream_TypeDef *DMAy_Streamx, uint32_t DMA_FlowCtrl)
	Configures, when the DMAy Streamx is disabled, the flow controller for the next transactions (Peripheral or Memory). More...

Detailed Description

Initialization and Configuration functions.

 ===============================================================================
                ##### Initialization and Configuration functions #####
 ===============================================================================  
    [..]
    This subsection provides functions allowing to initialize the DMA Stream source
    and destination addresses, incrementation and data sizes, transfer direction, 
    buffer size, circular/normal mode selection, memory-to-memory mode selection 
    and Stream priority value.
    [..]
    The DMA_Init() function follows the DMA configuration procedures as described in
    reference manual (RM0090) except the first point: waiting on EN bit to be reset.
    This condition should be checked by user application using the function DMA_GetCmdStatus()
    before calling the DMA_Init() function.

Function Documentation

void DMA_Cmd	(	DMA_Stream_TypeDef *	DMAy_Streamx,
		FunctionalState	NewState
	)

Enables or disables the specified DMAy Streamx.

Parameters

DMAy_Streamx	where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream.
NewState	new state of the DMAy Streamx. This parameter can be: ENABLE or DISABLE.

Note: This function may be used to perform Pause-Resume operation. When a transfer is ongoing, calling this function to disable the Stream will cause the transfer to be paused. All configuration registers and the number of remaining data will be preserved. When calling again this function to re-enable the Stream, the transfer will be resumed from the point where it was paused.; After configuring the DMA Stream (DMA_Init() function) and enabling the stream, it is recommended to check (or wait until) the DMA Stream is effectively enabled. A Stream may remain disabled if a configuration parameter is wrong. After disabling a DMA Stream, it is also recommended to check (or wait until) the DMA Stream is effectively disabled. If a Stream is disabled while a data transfer is ongoing, the current data will be transferred and the Stream will be effectively disabled only after the transfer of this single data is finished.

Return values

None

Definition at line 478 of file stm32f4xx_dma.c.

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void DMA_DeInit ( DMA_Stream_TypeDef * DMAy_Streamx )

Deinitialize the DMAy Streamx registers to their default reset values.

Parameters

DMAy_Streamx where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream.

Return values

None

Definition at line 196 of file stm32f4xx_dma.c.

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void DMA_FlowControllerConfig	(	DMA_Stream_TypeDef *	DMAy_Streamx,
		uint32_t	DMA_FlowCtrl
	)

Configures, when the DMAy Streamx is disabled, the flow controller for the next transactions (Peripheral or Memory).

Note: Before enabling this feature, check if the used peripheral supports the Flow Controller mode or not.

Parameters

DMAy_Streamx	where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream.
DMA_FlowCtrl	specifies the DMA flow controller. This parameter can be one of the following values: DMA_FlowCtrl_Memory: DMAy_Streamx transactions flow controller is the DMA controller. DMA_FlowCtrl_Peripheral: DMAy_Streamx transactions flow controller is the peripheral.

Return values

None

Definition at line 550 of file stm32f4xx_dma.c.

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void DMA_Init	(	DMA_Stream_TypeDef *	DMAy_Streamx,
		DMA_InitTypeDef *	DMA_InitStruct
	)

Initializes the DMAy Streamx according to the specified parameters in the DMA_InitStruct structure.

Note: Before calling this function, it is recommended to check that the Stream is actually disabled using the function DMA_GetCmdStatus().

Parameters

DMAy_Streamx	where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream.
DMA_InitStruct	pointer to a DMA_InitTypeDef structure that contains the configuration information for the specified DMA Stream.

Return values

None

Definition at line 319 of file stm32f4xx_dma.c.

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void DMA_PeriphIncOffsetSizeConfig	(	DMA_Stream_TypeDef *	DMAy_Streamx,
		uint32_t	DMA_Pincos
	)

Configures, when the PINC (Peripheral Increment address mode) bit is set, if the peripheral address should be incremented with the data size (configured with PSIZE bits) or by a fixed offset equal to 4 (32-bit aligned addresses).

Note: This function has no effect if the Peripheral Increment mode is disabled.

Parameters

DMAy_Streamx	where y can be 1 or 2 to select the DMA and x can be 0 to 7 to select the DMA Stream.
DMA_Pincos	specifies the Peripheral increment offset size. This parameter can be one of the following values: DMA_PINCOS_Psize: Peripheral address increment is done accordingly to PSIZE parameter. DMA_PINCOS_WordAligned: Peripheral address increment offset is fixed to 4 (32-bit aligned addresses).

Return values

None

Definition at line 514 of file stm32f4xx_dma.c.

void DMA_StructInit ( DMA_InitTypeDef * DMA_InitStruct )

Fills each DMA_InitStruct member with its default value.

Parameters

DMA_InitStruct : pointer to a DMA_InitTypeDef structure which will be initialized.

Return values

None

Definition at line 403 of file stm32f4xx_dma.c.

Functions

Detailed Description

Function Documentation