stm32f407使用定时器触发ad的问题

baonng

各位高手，请帮忙，我使用定时器1去触发ADC进行采样，然后通过DMA传输到RAM中。问题是，似乎只有程序下载时采样了一次，不知怎么回事啊。
初始化如下：
void ADC1_CH2_DMA_Config(void)
{
 ADC_InitTypeDef       ADC_InitStructure;
 ADC_CommonInitTypeDef ADC_CommonInitStructure;
 DMA_InitTypeDef       DMA_InitStructure;
 GPIO_InitTypeDef      GPIO_InitStructure;
 /* Enable ADC3, DMA2 and GPIO clocks ****************************************/
 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
 /* DMA2 Stream0 channel2 configuration **************************************/
 //DMA_DeInit(DMA2_Stream0);
 DMA_InitStructure.DMA_Channel = DMA_Channel_0; 
 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
 DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1V[0];//(uint32_t)&ADC1ConvertedValue;
 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
 DMA_InitStructure.DMA_BufferSize = 251;//1;
 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//DMA_MemoryInc_Disable;
 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//DMA_Mode_Circular;
 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
 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 Channel2 pin as analog input ******************************/
 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
 GPIO_Init(GPIOA, &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_8b;
 ADC_InitStructure.ADC_ScanConvMode = DISABLE;
 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//ENABLE;
 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 = 1;
 ADC_Init(ADC1, &ADC_InitStructure);
 /* ADC1 regular channel2 configuration *************************************/
 ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles);
 /* Enable ADC1 DMA */
 ADC_DMACmd(ADC1, ENABLE);
 /* Enable ADC1 */
 ADC_Cmd(ADC1, ENABLE);
}
void TIM_Config(void)
{
 TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
 TIM_OCInitTypeDef  TIM_OCInitStructure;
 RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
 /* Time Base configuration */
 TIM_TimeBaseStructure.TIM_Prescaler = 0;
 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
 TIM_TimeBaseStructure.TIM_Period = 30;
 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
 TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
 TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
 
 /* Channel 1, 2,3 and 4 Configuration in PWM mode */
 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
 TIM_OCInitStructure.TIM_Pulse = 6;
 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
 TIM_OC1Init(TIM1, &TIM_OCInitStructure);
 TIM_ARRPreloadConfig(TIM1, ENABLE);
 TIM_OC1PreloadConfig (TIM1, TIM_OCPreload_Enable);
 TIM_CtrlPWMOutputs(TIM1, ENABLE);
 /* TIM1 counter enable */
 TIM_Cmd(TIM1, ENABLE);
}
在主程序中：重新启动DMA
while
{
  DMA_Cmd(DMA2_Stream0, DISABLE);
  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1V[0];//(uint32_t)&ADC1ConvertedValue;
  DMA_InitStructure.DMA_BufferSize = 251;//1;
  DMA_Init(DMA2_Stream0, &DMA_InitStructure);
  DMA_Cmd(DMA2_Stream0, ENABLE);
}

baonng

还请大家帮帮忙看看啊！！！

hyq19921011

你这个问题解决了没  我最近也在弄这块 可否发一份adc的例程 1124198390@qq.com

jerryh

我最近也在调试ADC DMA传输，ADC可以用软件触发的吧？我现在读取直接储存器的值，总是为0，不知道啥回事

jerryh

我最近也在调试ADC DMA传输，ADC可以用软件触发的吧？我现在读取直接储存器的值，总是为0，不知道啥回事

jerryh

我最近也在调试ADC DMA传输，ADC可以用软件触发的吧？我现在读取直接储存器的值，总是为0，不知道啥回事