请问各位STM32F4怎么用定时器触发ADC采样啊？

认真就输了

怎么用定时器设置一个8K采样率的ADC进行电压采样。

正点原子

定时器设置为8Khz的中断就可以了。在中断里面采集一次ADC。

认真就输了

void ADC1_CH13_DMA_Config(void)
{
ADC_InitTypeDef       ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef       DMA_InitStructure;
GPIO_InitTypeDef      GPIO_InitStructure;
TIM_TimeBaseInitTypeDef   TIM_TimeBaseStructure; 
// NVIC_InitTypeDef   NVIC_InitStructure;

/* Enable ADC3, 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_Memory0BaseAddr = (uint32_t)adc_value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
// DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_BufferSize = 10;
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_Enable;         
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 Channel12 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; 
GPIO_InitStructure.GPIO_Speed= GPIO_Speed_100MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);

/* TIM8 TRGO Config **********************************************************/
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure); 
TIM_TimeBaseStructure.TIM_Prescaler = 0;        
TIM_TimeBaseStructure.TIM_Period = 10500 - 1;           

TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;     
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); 

TIM_SelectOutputTrigger(TIM1,TIM_TRGOSource_Update); 
TIM_Cmd(TIM1,ENABLE); 
TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE);
/* 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 = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
// ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_RisingFalling;
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 channel12 configuration *************************************/
ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 1, ADC_SampleTime_3Cycles);

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

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

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/*********************************************************************************/
void TIM1_CC_IRQHandler(void)
{
if(TIM_GetFlagStatus (TIM1,TIM_FLAG_Update )!=RESET)  
{  
 TIM_ClearFlag (TIM1,TIM_FLAG_Update);
}
}
我是这个样子做的 但没什么用感觉