stm32tim触发adcdma采样

你可以使用STM32的定时器（TIM）和DMA来触发ADC的转换和数据传输。下面是一个简单的示例代码，演示了如何使用TIM触发ADC和DMA进行采样：

#include "stm32f4xx.h"

#define ADC_BUFFER_SIZE 100

uint16_t adc_buffer[ADC_BUFFER_SIZE];

void TIM_Configuration(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
  
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 1000; // 定时器周期为1000（在72MHz下，定时器时钟为72MHz/1000 = 72kHz）
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 预分频器为71（定时器时钟为72kHz/72 = 1kHz）
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
  
    TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update); // 选择更新事件作为触发信号
  
    TIM_Cmd(TIM2, ENABLE);
}

void ADC_DMA_Configuration(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  
    DMA_InitTypeDef DMA_InitStructure;
    DMA_InitStructure.DMA_Channel = DMA_Channel_0;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
    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_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);
  
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);
  
    ADC_InitTypeDef ADC_InitStructure;
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; // 连续转换模式
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO; // 使用TIM2的触发信号
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);
  
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles); // 配置ADC通道0
  
    ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
  
    ADC_DMACmd(ADC1, ENABLE);
  
    ADC_Cmd(ADC1, ENABLE);
  
    ADC_SoftwareStartConv(ADC1);
}

int main(void)
{
    TIM_Configuration();
    ADC_DMA_Configuration();
  
    while (1)
    {
        // 程序主循环
    }
}

上述代码中，我们使用TIM2定时器的更新事件作为ADC的触发信号，并使用DMA2的Stream 0将ADC转换结果传输到adc_buffer数组中。请根据你的需求进行修改和适配。注意，此示例代码基于STM32F4系列微控制器，并使用了相应的库函数。如果你使用的是其他型号的STM32微控制器，请根据其参考手册和库函数进行相应的修改和调整。