AN3117 datasheet(13/28 Pages) STMICROELECTRONICS

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AN3117

Programming the DMA using the standard peripheral library

Doc ID 16846 Rev 4

13/28

Note:

PPP refers to a peripheral that supports DMA transfers, such as ADC1, DAC, USARTx

(x=1...3), I2C, SPIx (x=1;2), TIMx(x=1...5) and AES.

3.1.1

Configuring the DMA channels

The DMA driver provides the DMA_Init() function which can be used to configure all DMA

channels.

DMA_Init(DMA_Channelx. /* select Channel to be configured

DMA_Memory0BaseAddr,/* RAM memory Base Address */

DMA_PeripheralMemory1BaseAddr,

/* (case1) Peripheral base address for

memory to peripheral transfer

(case2) Memory base address for

memory to

memory transfer (this

feature exist only in Channel 3 */

DMA_BufferSize,

/* number of transactions */

DMA_DIR,

/* Direction of the transfer */

DMA_Mode,

simple or circular transfer. */

DMA_MemoryIncMode,

memory increment mode */

DMA_Priority,

software priority */

DMA_MemoryDataSize );

/* number of transfers */

Table 4 describes the DMA_lnit function parameters and their corresponding parameter

types.

Note:

Refer to the stm8l15x_dma.h file for more details about the DMA functions and their

parameters.

Table 4.

DMA_lnit parameters

Parameter name

Parameter type

DMA_Channelx

DMA_Channel_TypeDef

DMA_Memory0BaseAddr

uint16_t

DMA_PeripheralMemory1BaseAddr

uint16_t

DMA_BufferSize

uint8_t

DMA_DIR

DMA_DIR_TypeDef

DMA_Mode

DMA_Mode_TypeDef

DMA_MemoryIncMode

DMA_MemoryIncMode_TypeDef

DMA_Priority

DMA_Priority_TypeDef

DMA_MemoryDataSize

DMA_MemoryDataSize_TypeDef

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