我写的相关程序一直存在问题，想求个程序参考下，求大神帮忙，谢谢！

你可以参考固件库里的例程

在STM32F4-Discovery_FW_V1.1.0程序包中，有个ADC3DMA的例程，可以参考一下，网上相关例程也不少的

这些都有官方例程可以参考,上官网下载例程就行

找历程啊 很多的

stm32f407,ADC三通道同时采样，DMA传输，定时器控制采用周期
void ADC_init(void)
{
        ADC_InitTypeDef       ADC_InitStructure;
        ADC_CommonInitTypeDef ADC_CommonInitStructure;
        DMA_InitTypeDef       DMA_InitStructure;
        GPIO_InitTypeDef      GPIO_InitStructure;
        NVIC_InitTypeDef NVIC_InitStructure;
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
        TIM_OCInitTypeDef  TIM_OCInitStructure;
       
        /* Enable peripheral clocks */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC |RCC_AHB1Periph_GPIOA, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 |
                         RCC_APB2Periph_ADC3, ENABLE);
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
        /* Time base configuration */
  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
  TIM_TimeBaseStructure.TIM_Period = 13125;            
  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;      
  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;   
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
        /* TIM1 channel1 configuration in PWM mode */
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;               
  TIM_OCInitStructure.TIM_Pulse = 0x7F;
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;         
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
       
        TIM_ARRPreloadConfig(TIM1, ENABLE);
        TIM_OC1PreloadConfig (TIM1, TIM_OCPreload_Enable);
  //TIM1->CR2 =0x00;
  //TIM1->SMCR = 0x00;
  //TIM1->DIER = 0x00;
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
   
  /* Connect TIM Channels to AF2 */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource8, GPIO_AF_TIM1);
  /* Configure ADC Channel 12 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);
        /* Configure ADC Channel 12 pin as analog input */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  /* DMA2 Stream0 channel0 configuration */
  DMA_InitStructure.DMA_Channel = DMA_Channel_0;  
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC->CDR;
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
  DMA_InitStructure.DMA_BufferSize = ADC_Buffer_Size;
  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_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);
        /* Enable the DMA7 Interrupt*/   
  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
       
  /* DMA2_Stream0 enable */
        DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TC);
  DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
  DMA_Cmd(DMA2_Stream0, ENABLE);
       
       
/******************************************************************************/
/*  ADCs configuration: triple interleaved with 5cycles delay to reach 6Msps  */
/******************************************************************************/
  /* ADC Common configuration *************************************************/
  ADC_CommonInitStructure.ADC_Mode = ADC_TripleMode_RegSimult;
  ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;  
  ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
  ADC_CommonInit(&ADC_CommonInitStructure);
        ADC->CCR|= 0x2000;
  /* ADC1 regular channel 12 configuration ************************************/
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ScanConvMode = ENABLE;
  ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
        ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_InitStructure.ADC_NbrOfConversion = 3;
  ADC_Init(ADC1, &ADC_InitStructure);
  ADC_RegularChannelConfig(ADC1, ADC_Channel_15, 1, ADC_SampleTime_15Cycles);  
  ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 2, ADC_SampleTime_15Cycles);  
        ADC_RegularChannelConfig(ADC1, ADC_Channel_6,  3, ADC_SampleTime_15Cycles);  
  /* ADC2 regular channel 12 configuration ************************************/
  ADC_Init(ADC2, &ADC_InitStructure);
  /* ADC2 regular channel12 configuration */
  ADC_RegularChannelConfig(ADC2, ADC_Channel_11, 1, ADC_SampleTime_15Cycles);  
        ADC_RegularChannelConfig(ADC2, ADC_Channel_13, 2, ADC_SampleTime_15Cycles);  
        ADC_RegularChannelConfig(ADC2, ADC_Channel_7,  3, ADC_SampleTime_15Cycles);  
  /* ADC3 regular channel 12 configuration ************************************/
  ADC_Init(ADC3, &ADC_InitStructure);
  /* ADC3 regular channel12 configuration */
  ADC_RegularChannelConfig(ADC3, ADC_Channel_10, 1, ADC_SampleTime_15Cycles);  
        ADC_RegularChannelConfig(ADC3, ADC_Channel_12, 2, ADC_SampleTime_15Cycles);  
        ADC_RegularChannelConfig(ADC3, ADC_Channel_13, 3, ADC_SampleTime_15Cycles);
  /* Enable DMA request after last transfer (multi-ADC mode) ******************/
  //ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
        ADC_DMACmd(ADC1, ENABLE);
        ADC_DMACmd(ADC2, ENABLE);
        ADC_DMACmd(ADC3, ENABLE);
  /* Enable ADC1 **************************************************************/
  ADC_Cmd(ADC1, ENABLE);
  /* Enable ADC2 **************************************************************/
  ADC_Cmd(ADC2, ENABLE);
  /* Enable ADC3 **************************************************************/
  ADC_Cmd(ADC3, ENABLE);
  /* TIM1 counter enable */
  TIM_Cmd(TIM1,ENABLE);
  /* TIM1 main Output Enable */
  TIM_CtrlPWMOutputs(TIM1,ENABLE);
       
}

给你推荐一个固件库的地址，在IAR软件的安装目录下有所以官方历程的。
D:\Program Files\IAR Systems\Embedded Workbench 6.4\arm\examples\ST\STM32F10x\stm32f10x_stdperiph_lib

其中ADC DMA官方历程地址：
D:\Program Files\IAR Systems\Embedded Workbench 6.4\arm\examples\ST\STM32F10x\stm32f10x_stdperiph_lib\Project\STM32F10x_StdPeriph_Examples\ADC\ADC1_DMA
 
要学会寻找官方例程，使用官方例程