Posted on January 13, 2014 at 15:56I' m trying to save two ADC3 values in memory using dma, but nothing is stored in the memory, someone can help me, my code is:
int main(void)
{
//Configuration of the ADC channels used
ADC_Config();
ADC_SoftwareStartConv(ADC3);
printf(''start'');
while(1)
{
//ADC_val=ADCConvertedValues[0];
if (ADCConvertedValues[1] != 0xFFFF)
{
printf(''%X %X \n'', ADCConvertedValues[0], ADCConvertedValues[1]);
//ADCConvertedValues[1] = 0xFFFF;
}
}
}
static void ADC_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* Enable peripheral clocks *************************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
/* DMA2_Stream0 channel0 configuration **************************************/
DMA_DeInit(DMA2_Stream0);
DMA_InitStructure.DMA_Channel = DMA_Channel_2;// Channel 0 as mentionned in the datasheet ??
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC3->DR;// Address of ADC3 peripheral ??
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCConvertedValues[0];// pointer on my data
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;// From ADC to memory
DMA_InitStructure.DMA_BufferSize = 3;// 2 data to bring back (2 ANA input)
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;// No incrementation of peripheral, always read at the same address
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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);
/* DMA2_Stream0 enable */
DMA_Cmd(DMA2_Stream0, ENABLE);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_8b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge =ADC_ExternalTrigConvEdge_None ;
ADC_InitStructure.ADC_ExternalTrigConv =ADC_ExternalTrigConv_T1_CC1 ;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 2;
ADC_Init(ADC3, &ADC_InitStructure);
/* ADC3 regular channel configuration ******************************/
ADC_RegularChannelConfig(ADC3, ADC_Channel_9, 1, ADC_SampleTime_480Cycles);//PF3
ADC_RegularChannelConfig(ADC3, ADC_Channel_14, 2, ADC_SampleTime_480Cycles);//PF4
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
ADC_DMACmd(ADC3, ENABLE);
**************************************************************/
ADC_Cmd(ADC3, ENABLE);
}
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