STM32

stm32f407六路规则通道ad采样，数据不稳定，求问原子等大神

2019-07-20 18:15发布

站内问答 / STM32/STM8
6366 8 1503
刚改好的，基于官方库函数。数据不是很稳定，抖动厉害，ad输入接地偶尔会有30出现，接1v电压，数据抖动在正负3之间。

ad输入管脚pc0-pc5

#define ADC1_DR_ADDRESS     ((uint32_t)0x4001204C)；//&(adc->dr);
__IO uint16_t ADC1ConvertedValue[6] = {0,0,0,0,0,0};  //结果存放在这里；


void ADC1_CH10to15_DMA_Config(void) {   ADC_InitTypeDef       ADC_InitStructure;   ADC_CommonInitTypeDef ADC_CommonInitStructure;   DMA_InitTypeDef       DMA_InitStructure;   GPIO_InitTypeDef      GPIO_InitStructure;
  /* Enable ADC1, DMA2 and GPIO clocks ****************************************/   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  /* DMA2 Stream0 channel0 configuration **************************************/   DMA_InitStructure.DMA_Channel = DMA_Channel_0;     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;   DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;   DMA_InitStructure.DMA_BufferSize = 6;   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);   DMA_Cmd(DMA2_Stream0, ENABLE);
  /* Configure ADC1 Channel10to15 pin as analog input ******************************/   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;   GPIO_Init(GPIOC, &GPIO_InitStructure);
  /* 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);
  /* ADC1 Init ****************************************************************/   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 = 6;   ADC_Init(ADC1, &ADC_InitStructure);
  /* ADC1 regular channel10to15 configuration *************************************/   ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 1, ADC_SampleTime_112Cycles);   ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_112Cycles);   ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 3, ADC_SampleTime_112Cycles);   ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 4, ADC_SampleTime_112Cycles);   ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 5, ADC_SampleTime_112Cycles);   ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 6, ADC_SampleTime_112Cycles);
 /* Enable DMA request after last transfer (Single-ADC mode) */   ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
  /* Enable ADC1 DMA */   ADC_DMACmd(ADC1, ENABLE);
  /* Enable ADC1 */   ADC_Cmd(ADC1, ENABLE); }


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8条回答
hpdell
2019-07-20 19:40
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