求教大神关于STM32F4多路ADC采集用DMA存取的问题

只看该作者 · 2015-8-6 11:11

这是我使用的代码，修改库例程的，一个模拟口的采集和存取可以了，如果是多个模拟口的采集和存取，我应该怎么处理？在线等

只看该作者 · 2015-8-6 11:14

本帖最后由小金牛于 2015-8-6 14:28 编辑

啊山东的点点滴滴的的的的的的的的的

只看该作者 · 2015-8-6 11:17

上一个错了我重发，为了好看我分模块发
主函数
int main(void)
{
u16 i;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//ÉèÖÃÏµÍ³ÖÐ¶ÏÓÅÏÈ¼¶·Ö×é2
delay_init(168); //³õÊ¼»¯ÑÓÊ±º¯Êý
uart_init(115200); //³õÊ¼»¯´®¿Ú²¨ÌØÂÊÎª115200
delay_init(168);
LED_Init();
     LCD_Init();
POINT_COLOR=RED;
LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");
LCD_ShowString(30,70,200,16,16,"ADC TEST");
LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(30,110,200,16,16,"2014/5/6");
POINT_COLOR=BLUE;//ÉèÖÃ×ÖÌåÎªÀ¶É«
LCD_ShowString(30,130,200,16,16,"ADC1_CH5_VAL:");
LCD_ShowString(30,150,200,16,16,"ADC1_CH5_VOL:0.000V"); //ÏÈÔÚ¹Ì¶¨Î»ÖÃÏÔÊ¾Ð¡Êýµã
  /* ADC configuration */
  ADC_Config();
  /* Start ADC Software Conversion */
  ADC_SoftwareStartConv(ADCx);
  while (1)
  {
for(i=0;i<50;i++)
{
uwADCxConvertedVoltage = uhADCxConvertedValue[i] *3.3/4096;
LCD_ShowxNum(134,130,uhADCxConvertedValue[1],4,16,0); //ÏÔÊ¾ADCC²ÉÑùºóµÄÔÊ¼Öµ
LCD_ShowxNum(134,150,uwADCxConvertedVoltage,3,16,0); //ÏÔÊ¾µçÑ¹ÖµµÄÕûÊý²¿·Ö£¬3.1111µÄ»°£¬ÕâÀï¾ÍÊÇÏÔÊ¾3
LCD_ShowxNum(134,170,uhADCxConvertedValue[0],4,16,0); //ÏÔÊ¾ADCC²ÉÑùºóµÄÔÊ¼Öµ
LCD_ShowxNum(134,200,uhADCxConvertedValue[49],4,16,0); //ÏÔÊ¾ADCC²ÉÑùºóµÄÔÊ¼Öµ
delay_ms(1000);
}
LED0=!LED0;
delay_ms(1000);

  }
}

只看该作者 · 2015-8-6 11:18

ADC的配置有IO口的也有DMA的
static void ADC_Config(void)
{
  ADC_InitTypeDef    ADC_InitStructure;
  ADC_CommonInitTypeDef ADC_CommonInitStructure;
  DMA_InitTypeDef    DMA_InitStructure;
  GPIO_InitTypeDef    GPIO_InitStructure;

  /* Enable ADCx, DMA and GPIO clocks ****************************************/
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
  RCC_AHB1PeriphClockCmd(ADCx_CHANNEL_GPIO_CLK, ENABLE);
  RCC_APB2PeriphClockCmd(ADCx_CLK, ENABLE);


  /* DMA2 Stream0 channel_2 configuration **************************************/
  DMA_InitStructure.DMA_Channel = DMA_CHANNELx;
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADCx_DR_ADDRESS;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&uhADCxConvertedValue;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = 50;
  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(DMA_STREAMx, &DMA_InitStructure);
  DMA_Cmd(DMA_STREAMx, ENABLE);

  /* Configure ADC3 Channel7 pin as analog input ******************************/
  GPIO_InitStructure.GPIO_Pin = GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIO_PORT, &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);

  /* ADC3 Init ****************************************************************/
  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_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 1;
  ADC_Init(ADCx, &ADC_InitStructure);

  /* ADC3 regular channel7 configuration **************************************/
  ADC_RegularChannelConfig(ADCx, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);

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

  /* Enable ADC3 DMA */
  ADC_DMACmd(ADCx, ENABLE);

  /* Enable ADC3 */
  ADC_Cmd(ADCx, ENABLE);
}

只看该作者 · 2015-8-6 11:19

这是我的定义
  #define ADCx                   ADC3
  #define ADC_CHANNEL             ADC_Channel_7
  #define ADCx_CLK                RCC_APB2Periph_ADC3
  #define ADCx_CHANNEL_GPIO_CLK RCC_AHB1Periph_GPIOF
  #define GPIO_PIN                GPIO_Pin_9
  #define GPIO_PORT             GPIOF
  #define DMA_CHANNELx          DMA_Channel_2
  #define DMA_STREAMx             DMA2_Stream0
  #define ADCx_DR_ADDRESS       ((uint32_t)0x4001224C)