AN3427 datasheet(46/52 Pages) STMICROELECTRONICS

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Firmware migration using the library

AN3427

46/52

Doc ID 019001 Rev 1

4.6

DMA

This section shows through an example how to port existing code from STM32 F1 series to

F2 series.

The example below shows how to configure the DMA to transfer continuously converted

data from ADC1 to SRAM memory in STM32 F1 series:

#define ADC1_DR_ADDRESS

((uint32_t)0x4001244C)

...

uint16_t ADCConvertedValue = 0;

...

/* Enable DMA1's AHB interface clock */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

/* Configure DMA1 channel1 to transfer, in circular mode, the converted data from

ADC1 DR register to the ADCConvertedValue variable */

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = 1;

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA1 channel1 */

DMA_Cmd(DMA1_Channel1, ENABLE);

In F2 series you have to update this code as follows:

#define ADC1_DR_ADDRESS

((uint32_t)0x4001204C)

...

uint16_t ADCConvertedValue = 0;

...

/* Enable DMA2's AHB1 interface clock */

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

/* Configure DMA2 Stream0 channel0 to transfer, in circular mode, the converted

data from ADC1 DR register to the ADCConvertedValue variable */

DMA_InitStructure.DMA_Channel = DMA_Channel_0;

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_ADDRESS;

DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValue;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;

DMA_InitStructure.DMA_BufferSize = 1;

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority = DMA_Priority_High;

DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;

DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream0, &DMA_InitStructure);

/* Enable DMA2 Stream0 */

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