Question
stm32f407 dual ADC Simultaneous sampling issue
dual adc input gpio is pc4(ADC1 input)、pc5(ADC2 input).
ADC1 gpio pc4 input sine wave,ADC2 gpio pc5 input is floating.
when dma mode use ADC_DMAAccessMode_2,ADC2 last sample data is also sine wave,why?
when change dma mode is ADC_DMAAccessMode_1,ADC2 result data is correct.
my code below,pls help with me,thanks.
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
TIM_TimeBaseInitStructure.TIM_Period = arr;
TIM_TimeBaseInitStructure.TIM_Prescaler=psc;
TIM_TimeBaseInitStructure.TIM_CounterMode=TIM_CounterMode_Up;
TIM_TimeBaseInitStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseInitStructure);
//TIM_ITConfig(TIM3,TIM_IT_Update,ENABLE);
TIM_SelectOutputTrigger(TIM3,TIM_TRGOSource_Update);
TIM_ARRPreloadConfig(TIM3,ENABLE);
TIM_Cmd(TIM3,ENABLE);
}
void dual_adc_gpio_init()
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RHEOSTAT_ADC_GPIO_CLK1, ENABLE);
RCC_AHB1PeriphClockCmd(RHEOSTAT_ADC_GPIO_CLK2, ENABLE);
GPIO_InitStructure.GPIO_Pin = RHEOSTAT_ADC_GPIO_PIN1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(RHEOSTAT_ADC_GPIO_PORT1, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = RHEOSTAT_ADC_GPIO_PIN2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(RHEOSTAT_ADC_GPIO_PORT2, &GPIO_InitStructure);
}
void dual_adc_init()
{
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
NVIC_InitTypeDef NVIC_InitStruct;
RCC_AHB1PeriphClockCmd(RHEOSTAT_ADC_DMA_CLK, ENABLE);
RCC_APB2PeriphClockCmd(RHEOSTAT_ADC1_CLK , ENABLE);
RCC_APB2PeriphClockCmd(RHEOSTAT_ADC2_CLK , ENABLE);
#if 1
NVIC_SetPriorityGrouping(2);
//DMA_ITConfig( DMA2_Stream0 , DMA_IT_TC , ENABLE);
NVIC_InitStruct.NVIC_IRQChannelCmd=ENABLE;
NVIC_InitStruct.NVIC_IRQChannel=DMA2_Stream0_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_InitStruct);
#endif
DMA_InitStructure.DMA_PeripheralBaseAddr = RHEOSTAT_ADC_CDR_ADDR;
DMA_InitStructure.DMA_Memory0BaseAddr = (u32)g_adc_dma_buf1;
DMA_InitStructure.DMA_Memory1BaseAddr = (u32)g_adc_dma_buf2;
// DMA_InitStructure.DMA_Memory1BaseAddr = (u32)g_adc_dma_buf2;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 2;//SAMPLE_BUFFER_LEN;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular | DMA_SxCR_DBM;
//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_InitStructure.DMA_Channel = RHEOSTAT_ADC_DMA_CHANNEL;
DMA_Init(RHEOSTAT_ADC_DMA_STREAM, &DMA_InitStructure);
DMA_ITConfig( DMA2_Stream0 , DMA_IT_TC , ENABLE);
DMA_Cmd(RHEOSTAT_ADC_DMA_STREAM, ENABLE);
ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
//ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
//ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
//---------------------------------------------------------------------------
ADC_Init(RHEOSTAT_ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(RHEOSTAT_ADC1, RHEOSTAT_ADC_CHANNEL1, 1, ADC_SampleTime_3Cycles);
//---------------------------------------------------------------------------
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_Init(RHEOSTAT_ADC2, &ADC_InitStructure);
ADC_RegularChannelConfig(RHEOSTAT_ADC2, RHEOSTAT_ADC_CHANNEL2, 1, ADC_SampleTime_3Cycles);
//---------------------------------------------------------------------------
ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
ADC_DMACmd(RHEOSTAT_ADC1, ENABLE);
ADC_Cmd(RHEOSTAT_ADC1, ENABLE);
ADC_Cmd(RHEOSTAT_ADC2, ENABLE);
ADC_SoftwareStartConv(RHEOSTAT_ADC1);
//ADC_SoftwareStartConv(RHEOSTAT_ADC2);
}
int main()
{
gpio_output_init();
Rheostat_Init();
//TIM3_Int_Init(2,42-1);
TIM3_Int_Init(2,42-1);
}