ADC+DMA在UCOSIII中没问题，移植到FREERTOS中，ADC+DMA数据不对。

无名氏 · 发表于 2017-1-11 15:34:35

有同仁在FREERTOS中用ADC的DMA采集数据吗？需要注意哪些方面？

无名氏 · 发表于 2017-1-11 15:39:07

static void ADC1_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Enable DMA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_5|GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

static void ADC1_Mode_Config(void)
{
ADC_InitTypeDef    ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef    DMA_InitStructure;
//GPIO_InitTypeDef    GPIO_InitStructure;

/* ¨º1?¨¹¨ªa¨¦¨¨¨º¡À?¨® */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* DMA2 Stream0 channel0 ????-------------------------------------------------- */
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)&AD_Value[0][0];// (uint32_t)&uhADCConvertedValue;;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = M*N;
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_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);

/****************************************************************************
   PCLK2 = HCLK / 2
   ????????¦Ì?¨º?2¡¤??¦Ì
   ADCCLK = PCLK2 /8 = HCLK / 8 = 168 / 8 = 21M
   ADC2¨¦?¨´?¦Ì?¨º¡êo Sampling Time + Conversion Time = 480 + 12 cycles = 492cyc
                  Conversion Time = 21MHz / 492cyc = 42.6ksps.
*****************************************************************************/

/* ADC Common ???? ----------------------------------------------------------*/
     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);

/* ADC1 regular channel 12 configuration ************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = M;
ADC_Init(ADC1, &ADC_InitStructure);

     /* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);

   /* ADC1 regular channel18 (VBAT) configuration ******************************/
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles);

ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 2, ADC_SampleTime_480Cycles);

ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_480Cycles);

/* Enable VBAT channel */
   ADC_VBATCmd(ENABLE);

ADC_TempSensorVrefintCmd(ENABLE);

/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

/* Enable ADC1 **************************************************************/
ADC_Cmd(ADC1, ENABLE);

   /* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
}

void ADC1_Init(void)
{
ADC1_GPIO_Config();
ADC1_Mode_Config();
}

u16 MultiDMAGetAdcTest(u8 ch)
{

     u8 i;
u16 AdcMax,AdcMin,AdcSum,AdcResult,Adc_temp;
volatile u16 ADC_Data;

ADC_Data=0;

AdcMax=0;
      AdcMin=~0;
      AdcSum = 0;
      Adc_temp = 0;

   //taskDISABLE_INTERRUPTS(); /* ¿ªÆôµ÷¶ÈËø */
   // taskENTER_CRITICAL();
   for(i=0;i<34;i++)
      {

Adc_temp  =AD_Value[i][ch]&0XFFF;

         if(Adc_temp>AdcMax)
         {
            AdcMax=Adc_temp;
         }
         if(Adc_temp<AdcMin)
         {
            AdcMin=Adc_temp;
         }
         AdcSum+=Adc_temp;
      }
   AdcResult=(AdcSum-AdcMax-AdcMin)>>5;
   After_filter[ch]=(u16)AdcResult;
//taskENABLE_INTERRUPTS();
// taskEXIT_CRITICAL(); /* ÍË³öÁÙ½çÇø */
return(After_filter[ch]);
}

无名氏 · 发表于 2017-1-11 15:39:34

#define M 3 //Îª4¸öÍ¨µÀ
#define N 34 //Ã¿Í¨µÀ²É34´Î

extern u16 AD_Value[N][M]; //ÓÃÀ´´æ·ÅADC×ª»»½á¹û£¬Ò²ÊÇDMAµÄÄ¿±êµØÖ·
extern u16 After_filter[M]; //ÓÃÀ´´æ·ÅÇóÆ½¾ùÖµÖ®ºóµÄ½á¹û

游游游 · 发表于 2019-7-31 08:50:01

最近我也在将ADC+DMA 移植到FREERTOS ,在原版文件中 AD的值是正确，加入RTOS之后，AD的值就错误，也正在思考这个问题，目前没有找到解决办法

小灰灰Veni · 发表于 2019-11-28 15:52:48

兄弟问题解决了吗

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ADC+DMA在UCOSIII中没问题，移植到FREERTOS中，ADC+DMA数据不对。

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