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main()
{
ADC3_CH12_DMA_Config();
/* Start ADC3 Software Conversion */
ADC_SoftwareStartConv(ADC3);
}
void ADC3_CH12_DMA_Config(void)
{ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable ADC3, DMA2 and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOF, ENABLE);//¿ªÊ±ÖÓ£¬ADC3ËùÔÚDMAʱÖÓ£¬ADC3Òý½ÅËùÔÚGPIO·Ö×éʱÖÓ£¬
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);//¿ªÊ±ÖÓ£¬ADC3ƬÄÚÍâÉèʱÖÓ
/* DMA2 Stream0 channel0 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_Channel_2; //DMAͨµÀ
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;//ADC3µÄÊý¾Ý¼Ä´æÆ÷£¬Õû¸öADC3²Éµ½µÄÊý¾Ý¶¼´ÓÕâ¸öµØÖ·È¡
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC3_ConvertedValue;//Êý¾Ý»º´æ£¬Êý¾Ý½«×Ô¶¯´ÓÉÏÃæÄǸö¼Ä´æÆ÷È¡Êý¾Ý·Åµ½¸Ã»º´æ
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//DMA·½ÏòÊÇ´ÓÍâÉèµ½ÄÚ´æ
DMA_InitStructure.DMA_BufferSize = 2;//»º´æ´óС£¬ÕâÀïÊÇ2¸öͨµÀ£¬Ö»ÒªÁ½¸öÔªËؾÍok
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//DMAÍâÉèµØÖ·²»×Ô¶¯Ôö¼Ó
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//DMAÄÚ´æ×Ô¶¯Ôö¼Ó
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//Ñ»·Ä£Ê½
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_Stream1, &DMA_InitStructure);//Ñ¡ÔñDMA2µÄstream1
DMA_Cmd(DMA2_Stream1, ENABLE);
/* Configure ADC3 Channel12 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOF, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//¶ÀÁ¢Ä£Ê½
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;//attation here !
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;//attation here !
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 2;
ADC_Init(ADC3, &ADC_InitStructure);
/* ADC3 regular channel12 configuration *************************************/
ADC_RegularChannelConfig(ADC3, ADC_Channel_4, 1, ADC_SampleTime_480Cycles);
ADC_RegularChannelConfig(ADC3, ADC_Channel_5, 2, ADC_SampleTime_480Cycles);
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
/* Enable ADC3 DMA */
ADC_DMACmd(ADC3, ENABLE);
/* Enable ADC3 */
ADC_Cmd(ADC3, ENABLE);